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dd� Zddddddd�dd�Zddddddd�dd�ZdS )a JSON (JavaScript Object Notation) <http://json.org> is a subset of
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:mod:`json` exposes an API familiar to users of the standard library
:mod:`marshal` and :mod:`pickle` modules. It is derived from a
version of the externally maintained simplejson library.
Encoding basic Python object hierarchies::
>>> import json
>>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}])
'["foo", {"bar": ["baz", null, 1.0, 2]}]'
>>> print(json.dumps("\"foo\bar"))
"\"foo\bar"
>>> print(json.dumps('\u1234'))
"\u1234"
>>> print(json.dumps('\\'))
"\\"
>>> print(json.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True))
{"a": 0, "b": 0, "c": 0}
>>> from io import StringIO
>>> io = StringIO()
>>> json.dump(['streaming API'], io)
>>> io.getvalue()
'["streaming API"]'
Compact encoding::
>>> import json
>>> mydict = {'4': 5, '6': 7}
>>> json.dumps([1,2,3,mydict], separators=(',', ':'))
'[1,2,3,{"4":5,"6":7}]'
Pretty printing::
>>> import json
>>> print(json.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4))
{
"4": 5,
"6": 7
}
Decoding JSON::
>>> import json
>>> obj = ['foo', {'bar': ['baz', None, 1.0, 2]}]
>>> json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]') == obj
True
>>> json.loads('"\\"foo\\bar"') == '"foo\x08ar'
True
>>> from io import StringIO
>>> io = StringIO('["streaming API"]')
>>> json.load(io)[0] == 'streaming API'
True
Specializing JSON object decoding::
>>> import json
>>> def as_complex(dct):
... if '__complex__' in dct:
... return complex(dct['real'], dct['imag'])
... return dct
...
>>> json.loads('{"__complex__": true, "real": 1, "imag": 2}',
... object_hook=as_complex)
(1+2j)
>>> from decimal import Decimal
>>> json.loads('1.1', parse_float=Decimal) == Decimal('1.1')
True
Specializing JSON object encoding::
>>> import json
>>> def encode_complex(obj):
... if isinstance(obj, complex):
... return [obj.real, obj.imag]
... raise TypeError(f'Object of type {obj.__class__.__name__} '
... f'is not JSON serializable')
...
>>> json.dumps(2 + 1j, default=encode_complex)
'[2.0, 1.0]'
>>> json.JSONEncoder(default=encode_complex).encode(2 + 1j)
'[2.0, 1.0]'
>>> ''.join(json.JSONEncoder(default=encode_complex).iterencode(2 + 1j))
'[2.0, 1.0]'
Using json.tool from the shell to validate and pretty-print::
$ echo '{"json":"obj"}' | python -m json.tool
{
"json": "obj"
}
$ echo '{ 1.2:3.4}' | python -m json.tool
Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
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contain non-ASCII characters if they appear in strings contained in
``obj``. Otherwise, all such characters are escaped in JSON strings.
If ``check_circular`` is false, then the circular reference check
for container types will be skipped and a circular reference will
result in an ``OverflowError`` (or worse).
If ``allow_nan`` is false, then it will be a ``ValueError`` to
serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``)
in strict compliance of the JSON specification, instead of using the
JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).
If ``indent`` is a non-negative integer, then JSON array elements and
object members will be pretty-printed with that indent level. An indent
level of 0 will only insert newlines. ``None`` is the most compact
representation.
If specified, ``separators`` should be an ``(item_separator, key_separator)``
tuple. The default is ``(', ', ': ')`` if *indent* is ``None`` and
``(',', ': ')`` otherwise. To get the most compact JSON representation,
you should specify ``(',', ':')`` to eliminate whitespace.
``default(obj)`` is a function that should return a serializable version
of obj or raise TypeError. The default simply raises TypeError.
If *sort_keys* is true (default: ``False``), then the output of
dictionaries will be sorted by key.
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|� S )zUndo the patch.)rN rP rQ �__annotations__rR ) rw rv r rS rN rU r rS r# rx ry )rA r{ ri r r r ry � s �z_patch.__exit__c C s | � � }| j�| � |S )z-Activate a patch, returning any created mock.)r~ �_active_patchesr� )rA rf r r r �start� s z _patch.startc C s6 z| j �| � W n tk
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r: td� f ��Y nX � fdd�}||fS )Nr� r� z.Need a valid target to patch. You supplied: %rc s t � �S r/ �rO r �rN r r r� r� z _get_target.<locals>.<lambda>)�rsplitr r< )rN rU rQ r r� r � _get_target
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patch the named member (`attribute`) on an object (`target`) with a mock
object.
`patch.object` can be used as a decorator, class decorator or a context
manager. Arguments `new`, `spec`, `create`, `spec_set`,
`autospec` and `new_callable` have the same meaning as for `patch`. Like
`patch`, `patch.object` takes arbitrary keyword arguments for configuring
the mock object it creates.
When used as a class decorator `patch.object` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
z3 must be the actual object to be patched, not a strc s � S r/ r r r� r r r� * r� z _patch_object.<locals>.<lambda>)r1 �strr rP )
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t|| |
|||||i � } | | _| j�| � qt| S )a� Perform multiple patches in a single call. It takes the object to be
patched (either as an object or a string to fetch the object by importing)
and keyword arguments for the patches::
with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
...
Use `DEFAULT` as the value if you want `patch.multiple` to create
mocks for you. In this case the created mocks are passed into a decorated
function by keyword, and a dictionary is returned when `patch.multiple` is
used as a context manager.
`patch.multiple` can be used as a decorator, class decorator or a context
manager. The arguments `spec`, `spec_set`, `create`,
`autospec` and `new_callable` have the same meaning as for `patch`. These
arguments will be applied to *all* patches done by `patch.multiple`.
When used as a class decorator `patch.multiple` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
c s t � �S r/ r� r r� r r r� H r� z!_patch_multiple.<locals>.<lambda>c s � S r/ r r r� r r r� J r� z=Must supply at least one keyword argument with patch.multipler r� N) r1 r� r< rY r� rP rX rU r� )
rN r� rS r� rT rR rC rQ r� rU r� rY Z this_patcherr r� r �_patch_multiple1 sH � � �r� c
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`patch` acts as a function decorator, class decorator or a context
manager. Inside the body of the function or with statement, the `target`
is patched with a `new` object. When the function/with statement exits
the patch is undone.
If `new` is omitted, then the target is replaced with an
`AsyncMock if the patched object is an async function or a
`MagicMock` otherwise. If `patch` is used as a decorator and `new` is
omitted, the created mock is passed in as an extra argument to the
decorated function. If `patch` is used as a context manager the created
mock is returned by the context manager.
`target` should be a string in the form `'package.module.ClassName'`. The
`target` is imported and the specified object replaced with the `new`
object, so the `target` must be importable from the environment you are
calling `patch` from. The target is imported when the decorated function
is executed, not at decoration time.
The `spec` and `spec_set` keyword arguments are passed to the `MagicMock`
if patch is creating one for you.
In addition you can pass `spec=True` or `spec_set=True`, which causes
patch to pass in the object being mocked as the spec/spec_set object.
`new_callable` allows you to specify a different class, or callable object,
that will be called to create the `new` object. By default `AsyncMock` is
used for async functions and `MagicMock` for the rest.
A more powerful form of `spec` is `autospec`. If you set `autospec=True`
then the mock will be created with a spec from the object being replaced.
All attributes of the mock will also have the spec of the corresponding
attribute of the object being replaced. Methods and functions being
mocked will have their arguments checked and will raise a `TypeError` if
they are called with the wrong signature. For mocks replacing a class,
their return value (the 'instance') will have the same spec as the class.
Instead of `autospec=True` you can pass `autospec=some_object` to use an
arbitrary object as the spec instead of the one being replaced.
By default `patch` will fail to replace attributes that don't exist. If
you pass in `create=True`, and the attribute doesn't exist, patch will
create the attribute for you when the patched function is called, and
delete it again afterwards. This is useful for writing tests against
attributes that your production code creates at runtime. It is off by
default because it can be dangerous. With it switched on you can write
passing tests against APIs that don't actually exist!
Patch can be used as a `TestCase` class decorator. It works by
decorating each test method in the class. This reduces the boilerplate
code when your test methods share a common patchings set. `patch` finds
tests by looking for method names that start with `patch.TEST_PREFIX`.
By default this is `test`, which matches the way `unittest` finds tests.
You can specify an alternative prefix by setting `patch.TEST_PREFIX`.
Patch can be used as a context manager, with the with statement. Here the
patching applies to the indented block after the with statement. If you
use "as" then the patched object will be bound to the name after the
"as"; very useful if `patch` is creating a mock object for you.
`patch` takes arbitrary keyword arguments. These will be passed to
the `Mock` (or `new_callable`) on construction.
`patch.dict(...)`, `patch.multiple(...)` and `patch.object(...)` are
available for alternate use-cases.
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Patch a dictionary, or dictionary like object, and restore the dictionary
to its original state after the test.
`in_dict` can be a dictionary or a mapping like container. If it is a
mapping then it must at least support getting, setting and deleting items
plus iterating over keys.
`in_dict` can also be a string specifying the name of the dictionary, which
will then be fetched by importing it.
`values` can be a dictionary of values to set in the dictionary. `values`
can also be an iterable of `(key, value)` pairs.
If `clear` is True then the dictionary will be cleared before the new
values are set.
`patch.dict` can also be called with arbitrary keyword arguments to set
values in the dictionary::
with patch.dict('sys.modules', mymodule=Mock(), other_module=Mock()):
...
`patch.dict` can be used as a context manager, decorator or class
decorator. When used as a class decorator `patch.dict` honours
`patch.TEST_PREFIX` for choosing which methods to wrap.
r Fc K s, || _ t|�| _| j�|� || _d | _d S r/ )�in_dict�dictr� re �clear� _original)rA r� r� r� rC r r r r8 � s
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MagicMock is a subclass of Mock with default implementations
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Fc C s | � ||� | �� dS r� r� r� r r r r� s zMagicMock.mock_add_specN)Fr� r r r r r s
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sequential. There can be extra calls before or after the
specified awaits.
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c s g | ]}� � |��qS r r* r+ r� r r r� � s z4AsyncMockMixin.assert_has_awaits.<locals>.<listcomp>c s s | ]}t |t�r|V qd S r/ r- r r r r r. � s
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Enhance :class:`Mock` with features allowing to mock
an async function.
The :class:`AsyncMock` object will behave so the object is
recognized as an async function, and the result of a call is an awaitable:
>>> mock = AsyncMock()
>>> asyncio.iscoroutinefunction(mock)
True
>>> inspect.isawaitable(mock())
True
The result of ``mock()`` is an async function which will have the outcome
of ``side_effect`` or ``return_value``:
- if ``side_effect`` is a function, the async function will return the
result of that function,
- if ``side_effect`` is an exception, the async function will raise the
exception,
- if ``side_effect`` is an iterable, the async function will return the
next value of the iterable, however, if the sequence of result is
exhausted, ``StopIteration`` is raised immediately,
- if ``side_effect`` is not defined, the async function will return the
value defined by ``return_value``, hence, by default, the async function
returns a new :class:`AsyncMock` object.
If the outcome of ``side_effect`` or ``return_value`` is an async function,
the mock async function obtained when the mock object is called will be this
async function itself (and not an async function returning an async
function).
The test author can also specify a wrapped object with ``wraps``. In this
case, the :class:`Mock` object behavior is the same as with an
:class:`.Mock` object: the wrapped object may have methods
defined as async function functions.
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dd� Zddddddd�dd�Zddddddd�dd�ZdS )a JSON (JavaScript Object Notation) <http://json.org> is a subset of
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interchange format.
:mod:`json` exposes an API familiar to users of the standard library
:mod:`marshal` and :mod:`pickle` modules. It is derived from a
version of the externally maintained simplejson library.
Encoding basic Python object hierarchies::
>>> import json
>>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}])
'["foo", {"bar": ["baz", null, 1.0, 2]}]'
>>> print(json.dumps("\"foo\bar"))
"\"foo\bar"
>>> print(json.dumps('\u1234'))
"\u1234"
>>> print(json.dumps('\\'))
"\\"
>>> print(json.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True))
{"a": 0, "b": 0, "c": 0}
>>> from io import StringIO
>>> io = StringIO()
>>> json.dump(['streaming API'], io)
>>> io.getvalue()
'["streaming API"]'
Compact encoding::
>>> import json
>>> mydict = {'4': 5, '6': 7}
>>> json.dumps([1,2,3,mydict], separators=(',', ':'))
'[1,2,3,{"4":5,"6":7}]'
Pretty printing::
>>> import json
>>> print(json.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4))
{
"4": 5,
"6": 7
}
Decoding JSON::
>>> import json
>>> obj = ['foo', {'bar': ['baz', None, 1.0, 2]}]
>>> json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]') == obj
True
>>> json.loads('"\\"foo\\bar"') == '"foo\x08ar'
True
>>> from io import StringIO
>>> io = StringIO('["streaming API"]')
>>> json.load(io)[0] == 'streaming API'
True
Specializing JSON object decoding::
>>> import json
>>> def as_complex(dct):
... if '__complex__' in dct:
... return complex(dct['real'], dct['imag'])
... return dct
...
>>> json.loads('{"__complex__": true, "real": 1, "imag": 2}',
... object_hook=as_complex)
(1+2j)
>>> from decimal import Decimal
>>> json.loads('1.1', parse_float=Decimal) == Decimal('1.1')
True
Specializing JSON object encoding::
>>> import json
>>> def encode_complex(obj):
... if isinstance(obj, complex):
... return [obj.real, obj.imag]
... raise TypeError(f'Object of type {obj.__class__.__name__} '
... f'is not JSON serializable')
...
>>> json.dumps(2 + 1j, default=encode_complex)
'[2.0, 1.0]'
>>> json.JSONEncoder(default=encode_complex).encode(2 + 1j)
'[2.0, 1.0]'
>>> ''.join(json.JSONEncoder(default=encode_complex).iterencode(2 + 1j))
'[2.0, 1.0]'
Using json.tool from the shell to validate and pretty-print::
$ echo '{"json":"obj"}' | python -m json.tool
{
"json": "obj"
}
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patch the named member (`attribute`) on an object (`target`) with a mock
object.
`patch.object` can be used as a decorator, class decorator or a context
manager. Arguments `new`, `spec`, `create`, `spec_set`,
`autospec` and `new_callable` have the same meaning as for `patch`. Like
`patch`, `patch.object` takes arbitrary keyword arguments for configuring
the mock object it creates.
When used as a class decorator `patch.object` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
z3 must be the actual object to be patched, not a strc s � S r/ r r r� r r r� * r� z _patch_object.<locals>.<lambda>)r1 �strr rP )
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t|| |
|||||i � } | | _| j�| � qt| S )a� Perform multiple patches in a single call. It takes the object to be
patched (either as an object or a string to fetch the object by importing)
and keyword arguments for the patches::
with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
...
Use `DEFAULT` as the value if you want `patch.multiple` to create
mocks for you. In this case the created mocks are passed into a decorated
function by keyword, and a dictionary is returned when `patch.multiple` is
used as a context manager.
`patch.multiple` can be used as a decorator, class decorator or a context
manager. The arguments `spec`, `spec_set`, `create`,
`autospec` and `new_callable` have the same meaning as for `patch`. These
arguments will be applied to *all* patches done by `patch.multiple`.
When used as a class decorator `patch.multiple` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
c s t � �S r/ r� r r� r r r� H r� z!_patch_multiple.<locals>.<lambda>c s � S r/ r r r� r r r� J r� z=Must supply at least one keyword argument with patch.multipler r� N) r1 r� r< rY r� rP rX rU r� )
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`patch` acts as a function decorator, class decorator or a context
manager. Inside the body of the function or with statement, the `target`
is patched with a `new` object. When the function/with statement exits
the patch is undone.
If `new` is omitted, then the target is replaced with an
`AsyncMock if the patched object is an async function or a
`MagicMock` otherwise. If `patch` is used as a decorator and `new` is
omitted, the created mock is passed in as an extra argument to the
decorated function. If `patch` is used as a context manager the created
mock is returned by the context manager.
`target` should be a string in the form `'package.module.ClassName'`. The
`target` is imported and the specified object replaced with the `new`
object, so the `target` must be importable from the environment you are
calling `patch` from. The target is imported when the decorated function
is executed, not at decoration time.
The `spec` and `spec_set` keyword arguments are passed to the `MagicMock`
if patch is creating one for you.
In addition you can pass `spec=True` or `spec_set=True`, which causes
patch to pass in the object being mocked as the spec/spec_set object.
`new_callable` allows you to specify a different class, or callable object,
that will be called to create the `new` object. By default `AsyncMock` is
used for async functions and `MagicMock` for the rest.
A more powerful form of `spec` is `autospec`. If you set `autospec=True`
then the mock will be created with a spec from the object being replaced.
All attributes of the mock will also have the spec of the corresponding
attribute of the object being replaced. Methods and functions being
mocked will have their arguments checked and will raise a `TypeError` if
they are called with the wrong signature. For mocks replacing a class,
their return value (the 'instance') will have the same spec as the class.
Instead of `autospec=True` you can pass `autospec=some_object` to use an
arbitrary object as the spec instead of the one being replaced.
By default `patch` will fail to replace attributes that don't exist. If
you pass in `create=True`, and the attribute doesn't exist, patch will
create the attribute for you when the patched function is called, and
delete it again afterwards. This is useful for writing tests against
attributes that your production code creates at runtime. It is off by
default because it can be dangerous. With it switched on you can write
passing tests against APIs that don't actually exist!
Patch can be used as a `TestCase` class decorator. It works by
decorating each test method in the class. This reduces the boilerplate
code when your test methods share a common patchings set. `patch` finds
tests by looking for method names that start with `patch.TEST_PREFIX`.
By default this is `test`, which matches the way `unittest` finds tests.
You can specify an alternative prefix by setting `patch.TEST_PREFIX`.
Patch can be used as a context manager, with the with statement. Here the
patching applies to the indented block after the with statement. If you
use "as" then the patched object will be bound to the name after the
"as"; very useful if `patch` is creating a mock object for you.
`patch` takes arbitrary keyword arguments. These will be passed to
the `Mock` (or `new_callable`) on construction.
`patch.dict(...)`, `patch.multiple(...)` and `patch.object(...)` are
available for alternate use-cases.
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Patch a dictionary, or dictionary like object, and restore the dictionary
to its original state after the test.
`in_dict` can be a dictionary or a mapping like container. If it is a
mapping then it must at least support getting, setting and deleting items
plus iterating over keys.
`in_dict` can also be a string specifying the name of the dictionary, which
will then be fetched by importing it.
`values` can be a dictionary of values to set in the dictionary. `values`
can also be an iterable of `(key, value)` pairs.
If `clear` is True then the dictionary will be cleared before the new
values are set.
`patch.dict` can also be called with arbitrary keyword arguments to set
values in the dictionary::
with patch.dict('sys.modules', mymodule=Mock(), other_module=Mock()):
...
`patch.dict` can be used as a context manager, decorator or class
decorator. When used as a class decorator `patch.dict` honours
`patch.TEST_PREFIX` for choosing which methods to wrap.
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MagicMock is a subclass of Mock with default implementations
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Enhance :class:`Mock` with features allowing to mock
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>>> asyncio.iscoroutinefunction(mock)
True
>>> inspect.isawaitable(mock())
True
The result of ``mock()`` is an async function which will have the outcome
of ``side_effect`` or ``return_value``:
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result of that function,
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exception,
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next value of the iterable, however, if the sequence of result is
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- if ``side_effect`` is not defined, the async function will return the
value defined by ``return_value``, hence, by default, the async function
returns a new :class:`AsyncMock` object.
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async function itself (and not an async function returning an async
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Based on Martin Richard's asynctest project.
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_Call(('name', (), {})) == ('name',)
_Call(('name', (1,), {})) == ('name', (1,))
_Call(((), {'a': 'b'})) == ({'a': 'b'},)
The `_Call` object provides a useful shortcut for comparing with call::
_Call(((1, 2), {'a': 3})) == call(1, 2, a=3)
_Call(('foo', (1, 2), {'a': 3})) == call.foo(1, 2, a=3)
If the _Call has no name then it will match any name.
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<listcomp>� s z(Message.__contains__.<locals>.<listcomp>)r- r8 rz r r r � __contains__� s zMessage.__contains__c c s | j D ]\}}|V qd S rR �r8 )r> Zfieldr& r r r �__iter__� s zMessage.__iter__c C s dd� | j D �S )a. Return a list of all the message's header field names.
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c S s g | ] \}}|�qS r r r� r r r r� � s z Message.keys.<locals>.<listcomp>r� rA r r r �keys� s z Message.keysc s � fdd�� j D �S )a) Return a list of all the message's header values.
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c s g | ]\}}� j �||��qS r �r7 �header_fetch_parser� rA r r r� � s �z"Message.values.<locals>.<listcomp>r� rA r rA r �values� s
�zMessage.valuesc s � fdd�� j D �S )a' Get all the message's header fields and values.
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c s" g | ]\}}|� j �||�f�qS r r� r� rA r r r� � s �z!Message.items.<locals>.<listcomp>r� rA r rA r �items� s
�z
Message.itemsc C s: |� � }| jD ]&\}}|� � |kr| j�||� S q|S )z~Get a header value.
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)r- r8 r. r7 r� )r> r{ r� r� r� r� r r r �get_all� s zMessage.get_allc K sp g }|� � D ]<\}}|dkr0|�|�dd�� q |�t|�dd�|�� q |dk r^|�d|� t�|�| |< dS )u� Extended header setting.
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parameter value contains non-ASCII characters it can be specified as a
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the utf-8 charset and a language of ''.
Examples:
msg.add_header('content-disposition', 'attachment', filename='bud.gif')
msg.add_header('content-disposition', 'attachment',
filename=('utf-8', '', Fußballer.ppt'))
msg.add_header('content-disposition', 'attachment',
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type this will always return a value.
RFC 2045 defines a message's default type to be text/plain unless it
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rr |�� }d}Y nX |�||f� q*t�|�}|S )Nr) r r ) r� ra r3 r� r r} r. r Z
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the parameter the value is the empty string. The value is as
described in the get_param() method.
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value can either be a string, or a 3-tuple if the parameter was RFC
2231 encoded. When it's a 3-tuple, the elements of the value are of
the form (CHARSET, LANGUAGE, VALUE). Note that both CHARSET and
LANGUAGE can be None, in which case you should consider VALUE to be
encoded in the us-ascii charset. You can usually ignore LANGUAGE.
The parameter value (either the returned string, or the VALUE item in
the 3-tuple) is always unquoted, unless unquote is set to False.
If your application doesn't care whether the parameter was RFC 2231
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)r� r- r5 )r> r r� r� r4 r� r� r r r rc � s
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value will be appended as per RFC 2045.
An alternate header can be specified in the header argument, and all
parameters will be quoted as necessary unless requote is False.
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r r r- ra rc r' r� rg r� r� ) r> r r& r� �requoter Zlanguager[ r� Z old_param� old_valueZ append_paramr r r rw � s6
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value. All values will be quoted as necessary unless requote is
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�zMessage.del_paramc C s� |� d�dkst�|�� dkr,| d= d| d< || kr@|| |< dS | j||d�}| |= || |< |dd� D ]\}}| �||||� qhdS ) aK Set the main type and subtype for the Content-Type header.
type must be a string in the form "maintype/subtype", otherwise a
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parameters in place. If requote is False, this leaves the existing
header's quoting as is. Otherwise, the parameters will be quoted (the
default).
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r� r r� z mime-versionrs rr Nr� )r+ r} r- r� rw )r> r` r� r� r� r� r� r r r �set_type s zMessage.set_typec C sD t � }| �d|d�}||kr*| �d|d�}||kr6|S t�|��� S )a@ Return the filename associated with the payload if present.
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main MIME type of "text", or the charset is not defined.
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base Message class, but defaults to None, meaning that the policy value
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address that is not in a group, which is convenient when manipulating
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PROVISIONAL
The API extensions enabled by this policy are currently provisional.
Refer to the documentation for details.
This policy adds new header parsing and folding algorithms. Instead of
simple strings, headers are custom objects with custom attributes
depending on the type of the field. The folding algorithm fully
implements RFCs 2047 and 5322.
In addition to the settable attributes listed above that apply to
all Policies, this policy adds the following additional attributes:
utf8 -- if False (the default) message headers will be
serialized as ASCII, using encoded words to encode
any non-ASCII characters in the source strings. If
True, the message headers will be serialized using
utf8 and will not contain encoded words (see RFC
6532 for more on this serialization format).
refold_source -- if the value for a header in the Message object
came from the parsing of some source, this attribute
indicates whether or not a generator should refold
that value when transforming the message back into
stream form. The possible values are:
none -- all source values use original folding
long -- source values that have any line that is
longer than max_line_length will be
refolded
all -- all values are refolded.
The default is 'long'.
header_factory -- a callable that takes two arguments, 'name' and
'value', where 'name' is a header field name and
'value' is an unfolded header field value, and
returns a string-like object that represents that
header. A default header_factory is provided that
understands some of the RFC5322 header field types.
(Currently address fields and date fields have
special treatment, while all other fields are
treated as unstructured. This list will be
completed before the extension is marked stable.)
content_manager -- an object with at least two methods: get_content
and set_content. When the get_content or
set_content method of a Message object is called,
it calls the corresponding method of this object,
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The name is returned unchanged. If the input value has a 'name'
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object of some sort). If a source value needs to be refolded according
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policy and returned. The exception is lines containing non-ascii
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The same as fold if cte_type is 7bit, except that the returned value is
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refold_header setting, since there is no way to know whether the binary
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PROVISIONAL
The API extensions enabled by this policy are currently provisional.
Refer to the documentation for details.
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simple strings, headers are custom objects with custom attributes
depending on the type of the field. The folding algorithm fully
implements RFCs 2047 and 5322.
In addition to the settable attributes listed above that apply to
all Policies, this policy adds the following additional attributes:
utf8 -- if False (the default) message headers will be
serialized as ASCII, using encoded words to encode
any non-ASCII characters in the source strings. If
True, the message headers will be serialized using
utf8 and will not contain encoded words (see RFC
6532 for more on this serialization format).
refold_source -- if the value for a header in the Message object
came from the parsing of some source, this attribute
indicates whether or not a generator should refold
that value when transforming the message back into
stream form. The possible values are:
none -- all source values use original folding
long -- source values that have any line that is
longer than max_line_length will be
refolded
all -- all values are refolded.
The default is 'long'.
header_factory -- a callable that takes two arguments, 'name' and
'value', where 'name' is a header field name and
'value' is an unfolded header field value, and
returns a string-like object that represents that
header. A default header_factory is provided that
understands some of the RFC5322 header field types.
(Currently address fields and date fields have
special treatment, while all other fields are
treated as unstructured. This list will be
completed before the extension is marked stable.)
content_manager -- an object with at least two methods: get_content
and set_content. When the get_content or
set_content method of a Message object is called,
it calls the corresponding method of this object,
passing it the message object as its first argument,
and any arguments or keywords that were passed to
it as additional arguments. The default
content_manager is
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The name is parsed as everything up to the ':' and returned unmodified.
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The name is returned unchanged. If the input value has a 'name'
attribute and it matches the name ignoring case, the value is returned
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If the value has a 'name' attribute, it is returned to unmodified.
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into the unicode unknown-character glyph.
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z EmailPolicy.header_fetch_parsec C s | j ||dd�S )a +
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object of some sort). If a source value needs to be refolded according
to the policy, it is converted into a custom header object by passing
the name and the value with any linesep characters removed to the
header_factory method. Folding of a custom header object is done by
calling its fold method with the current policy.
Source values are split into lines using splitlines. If the value is
not to be refolded, the lines are rejoined using the linesep from the
policy and returned. The exception is lines containing non-ascii
binary data. In that case the value is refolded regardless of the
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using the unknown-8bit charset.
T��
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The same as fold if cte_type is 7bit, except that the returned value is
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bytes. Headers with binary data are not refolded, regardless of the
refold_header setting, since there is no way to know whether the binary
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The parsing methods defined in this module implement various email related
parsing rules. Principal among them is RFC 5322, which is the followon
to RFC 2822 and primarily a clarification of the former. It also implements
RFC 2047 encoded word decoding.
RFC 5322 goes to considerable trouble to maintain backward compatibility with
RFC 822 in the parse phase, while cleaning up the structure on the generation
phase. This parser supports correct RFC 5322 generation by tagging white space
as folding white space only when folding is allowed in the non-obsolete rule
sets. Actually, the parser is even more generous when accepting input than RFC
5322 mandates, following the spirit of Postel's Law, which RFC 5322 encourages.
Where possible deviations from the standard are annotated on the 'defects'
attribute of tokens that deviate.
The general structure of the parser follows RFC 5322, and uses its terminology
where there is a direct correspondence. Where the implementation requires a
somewhat different structure than that used by the formal grammar, new terms
that mimic the closest existing terms are used. Thus, it really helps to have
a copy of RFC 5322 handy when studying this code.
Input to the parser is a string that has already been unfolded according to
RFC 5322 rules. According to the RFC this unfolding is the very first step, and
this parser leaves the unfolding step to a higher level message parser, which
will have already detected the line breaks that need unfolding while
determining the beginning and end of each header.
The output of the parser is a TokenList object, which is a list subclass. A
TokenList is a recursive data structure. The terminal nodes of the structure
are Terminal objects, which are subclasses of str. These do not correspond
directly to terminal objects in the formal grammar, but are instead more
practical higher level combinations of true terminals.
All TokenList and Terminal objects have a 'value' attribute, which produces the
semantically meaningful value of that part of the parse subtree. The value of
all whitespace tokens (no matter how many sub-tokens they may contain) is a
single space, as per the RFC rules. This includes 'CFWS', which is herein
included in the general class of whitespace tokens. There is one exception to
the rule that whitespace tokens are collapsed into single spaces in values: in
the value of a 'bare-quoted-string' (a quoted-string with no leading or
trailing whitespace), any whitespace that appeared between the quotation marks
is preserved in the returned value. Note that in all Terminal strings quoted
pairs are turned into their unquoted values.
All TokenList and Terminal objects also have a string value, which attempts to
be a "canonical" representation of the RFC-compliant form of the substring that
produced the parsed subtree, including minimal use of quoted pair quoting.
Whitespace runs are not collapsed.
Comment tokens also have a 'content' attribute providing the string found
between the parens (including any nested comments) with whitespace preserved.
All TokenList and Terminal objects have a 'defects' attribute which is a
possibly empty list all of the defects found while creating the token. Defects
may appear on any token in the tree, and a composite list of all defects in the
subtree is available through the 'all_defects' attribute of any node. (For
Terminal notes x.defects == x.all_defects.)
Each object in a parse tree is called a 'token', and each has a 'token_type'
attribute that gives the name from the RFC 5322 grammar that it represents.
Not all RFC 5322 nodes are produced, and there is one non-RFC 5322 node that
may be produced: 'ptext'. A 'ptext' is a string of printable ascii characters.
It is returned in place of lists of (ctext/quoted-pair) and
(qtext/quoted-pair).
XXX: provide complete list of token types.
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r� c @ s e Zd Zedd� �Zdd� ZdS )�WhiteSpaceTerminalc C s dS rM r r& r r r r � s zWhiteSpaceTerminal.valuec C s dS )NTr r& r r r r0 � s z!WhiteSpaceTerminal.startswith_fwsN�r+ rF rG rJ r r0 r r r r r � s
r c @ s e Zd Zedd� �Zdd� ZdS )�
ValueTerminalc C s | S r r r& r r r r � s zValueTerminal.valuec C s dS )NFr r& r r r r0 � s z ValueTerminal.startswith_fwsNr r r r r r � s
r c @ s e Zd Zedd� �Zdd� ZdS )�EWWhiteSpaceTerminalc C s dS r� r r& r r r r � s zEWWhiteSpaceTerminal.valuec C s dS r� r r& r r r r' � s z EWWhiteSpaceTerminal.__str__N)r+ rF rG rJ r r' r r r r r � s
r c @ s e Zd ZdZdS )�_InvalidEwErrorz1Invalid encoded word found while parsing headers.N)r+ rF rG �__doc__r r r r r � s r r� �,�list-separatorr� zroute-component-markerz([{}]+)r z[^{}]+z[\x00-\x20\x7F]c C s> t | �}|r | j�t�|�� t�| �r:| j�t�d�� dS )z@If input token contains ASCII non-printables, register a defect.z*Non-ASCII characters found in header tokenN)�_non_printable_finderr rh r ZNonPrintableDefectr r� r� )�xtextZnon_printablesr r r �_validate_xtext� s
�r c C s� t | d�^}}g }d}d}tt|��D ]L}|| dkrJ|rDd}d}nd}q&|rTd}n|| |krd q||�|| � q&|d }d�|�d�||d� g| �|fS )ak Scan printables/quoted-pairs until endchars and return unquoted ptext.
This function turns a run of qcontent, ccontent-without-comments, or
dtext-with-quoted-printables into a single string by unquoting any
quoted printables. It returns the string, the remaining value, and
a flag that is True iff there were any quoted printables decoded.
r� Fr Tr N)�
_wsp_splitter�ranger� rh r% )r �endcharsZfragment� remainderZvchars�escape�had_qp�posr r r �_get_ptext_to_endchars� s$ r c C s. | � � }t| dt| �t|� � d�}||fS )z�FWS = 1*WSP
This isn't the RFC definition. We're using fws to represent tokens where
folding can be done, but when we are parsing the *un*folding has already
been done so we don't need to watch out for CRLF.
N�fws)r� r r� )r Znewvaluer r r r �get_fws s r c
C s� t � }| �d�s t�d�| ���| dd� �dd�^}}|| dd� krXt�d�| ���d�|�}t|�dkr�|d tkr�|d tkr�|� d �dk r�|�dd�^}}|d | }t|�� �dkr�|j
� t� d
�� | |_
d�|�} z t�d| d �\}}}} W n* ttfk
�r* td �|j
���Y nX ||_||_|j
�| � |�r�|d tk�rrt|�\}
}|� |
� �qDt|d�^} }t| d �} t| � |� | � d�|�}�qD| �r�| d tk�r�|j
� t� d
�� || fS )zE encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
�=?z"expected encoded word but found {}r� Nz?=r� r r �?z whitespace inside encoded wordz!encoded word format invalid: '{}'�vtextz.missing trailing whitespace after encoded-word)r] �
startswithr �HeaderParseErrorr* r� r% r� r �countr rh r� r_ �_ewr� �
ValueError�KeyErrorr r` ra r4 �WSPr r r r )
r Zewr� r Zremstr�restr� r` ra r r6 �charsr r r r �get_encoded_word sd
��
�
� �
�
�
�r" c C sF t � }| �rB| d tkr0t| �\}} |�|� qd}| �d�r�zt| �\}} W n, tk
rf d}Y n� tjk
rz Y nrX d}t |�dkr�|d j
dkr�|j �t� d�� d}|r�t |�dkr�|d j
d
kr�t
|d d�|d< |�|� qt| d�^}}|�rt�|��r| �d�^}}t|d �}t|� |�|� d �|�} q|S )
aO unstructured = (*([FWS] vchar) *WSP) / obs-unstruct
obs-unstruct = *((*LF *CR *(obs-utext) *LF *CR)) / FWS)
obs-utext = %d0 / obs-NO-WS-CTL / LF / CR
obs-NO-WS-CTL is control characters except WSP/CR/LF.
So, basically, we have printable runs, plus control characters or nulls in
the obsolete syntax, separated by whitespace. Since RFC 2047 uses the
obsolete syntax in its specification, but requires whitespace on either
side of the encoded words, I can see no reason to need to separate the
non-printable-non-whitespace from the printable runs if they occur, so we
parse this into xtext tokens separated by WSP tokens.
Because an 'unstructured' value must by definition constitute the entire
value, this 'get' routine does not return a remaining value, only the
parsed TokenList.
r Tr Fr� r z&missing whitespace before encoded wordr� ���r^ r r )rR r r rh r r" r r r r� rD r r� r r �rfc2047_matcher�search� partitionr r r% )r rS r6 �valid_ewZhave_wsr� r r r r r �get_unstructured? sJ
� �
r( c C s* t | d�\}} }t|d�}t|� || fS )a ctext = <printable ascii except \ ( )>
This is not the RFC ctext, since we are handling nested comments in comment
and unquoting quoted-pairs here. We allow anything except the '()'
characters, but if we find any ASCII other than the RFC defined printable
ASCII, a NonPrintableDefect is added to the token's defects list. Since
quoted pairs are converted to their unquoted values, what is returned is
a 'ptext' token. In this case it is a WhiteSpaceTerminal, so it's value
is ' '.
z()r� )r r r �r r� �_r r r � get_qp_ctext� s
r+ c C s* t | d�\}} }t|d�}t|� || fS )ao qcontent = qtext / quoted-pair
We allow anything except the DQUOTE character, but if we find any ASCII
other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Any quoted pairs are converted to their
unquoted values, so what is returned is a 'ptext' token. In this case it
is a ValueTerminal.
r
r� )r r r r) r r r � get_qcontent� s
r, c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )z�atext = <matches _atext_matcher>
We allow any non-ATOM_ENDS in atext, but add an InvalidATextDefect to
the token's defects list if we find non-atext characters.
z expected atext but found '{}'N�atext)�_non_atom_end_matcherr r r* r| r� r r )r �mr- r r r � get_atext� s �
r0 c C sr | d dkr t �d�| ���t� }| dd� } | rT| d dkrTt| �\}} |�|� | �rB| d dk�rB| d tkr�t| �\}} n�| dd� dk�r*d}z&t| �\}} |j �t �
d �� d
}W n" t jk
r� t| �\}} Y nX |�r6t |�dk�r6|d j d k�r6|d
j dk�r6t
|d d �|d < n t| �\}} |�|� qT| �sb|j �t �
d�� || fS || dd� fS )z�bare-quoted-string = DQUOTE *([FWS] qcontent) [FWS] DQUOTE
A quoted-string without the leading or trailing white space. Its
value is the text between the quote marks, with whitespace
preserved and quoted pairs decoded.
r r
zexpected '"' but found '{}'r� Nr� r Fz!encoded word inside quoted stringTr� r r# r^ z"end of header inside quoted string)r r r* rm r, rh r r r" r r� r� rD r )r Zbare_quoted_stringr6 r' r r r �get_bare_quoted_string� sL �
� � �
�r1 c C s� | r | d dkr t �d�| ���t� }| dd� } | r�| d dkr�| d tkr\t| �\}} n&| d dkrvt| �\}} n t| �\}} |�|� q2| s�|j �t �
d�� || fS || dd� fS )z�comment = "(" *([FWS] ccontent) [FWS] ")"
ccontent = ctext / quoted-pair / comment
We handle nested comments here, and quoted-pair in our qp-ctext routine.
r r zexpected '(' but found '{}'r� Nrp z end of header inside comment) r r r* rn r r � get_commentr+ rh r r� )r rO r6 r r r r2 � s& �
�r2 c C sP t � }| rH| d tkrH| d tkr0t| �\}} n t| �\}} |�|� q|| fS )z,CFWS = (1*([FWS] comment) [FWS]) / FWS
r )rX � CFWS_LEADERr r r2 rh )r rY r6 r r r �get_cfws� s r4 c C sp t � }| r,| d tkr,t| �\}} |�|� t| �\}} |�|� | rh| d tkrht| �\}} |�|� || fS )z�quoted-string = [CFWS] <bare-quoted-string> [CFWS]
'bare-quoted-string' is an intermediate class defined by this
parser and not by the RFC grammar. It is the quoted string
without any attached CFWS.
r )rb r3 r4 rh r1 )r Z
quoted_stringr6 r r r �get_quoted_string s
r5 c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���| �d�r�zt | �\}} W q� tjk
r� t
| �\}} Y q�X n t
| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )zPatom = [CFWS] 1*atext [CFWS]
An atom could be an rfc2047 encoded word.
r z expected atom but found '{}'r ) rZ r3 r4 rh � ATOM_ENDSr r r* r r" r0 )r r[ r6 r r r �get_atom s&
�
r7 c C s� t � }| r| d tkr&t�d�| ���| rt| d tkrtt| �\}} |�|� | r&| d dkr&|�t� | dd� } q&|d tkr�t�d�d| ���|| fS )z( dot-text = 1*atext *("." 1*atext)
r z8expected atom at a start of dot-atom-text but found '{}'r r� Nr� z4expected atom at end of dot-atom-text but found '{}')r� r6 r r r* r0 rh r� )r Z
dot_atom_textr6 r r r �get_dot_atom_text0 s �
�r8 c C s� t � }| d tkr(t| �\}} |�|� | �d�rhzt| �\}} W qt tjk
rd t| �\}} Y qtX n t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )z� dot-atom = [CFWS] dot-atom-text [CFWS]
Any place we can have a dot atom, we could instead have an rfc2047 encoded
word.
r r ) r� r3 r4 rh r r" r r r8 )r Zdot_atomr6 r r r � get_dot_atomC s
r9 c C s� | d t krt| �\}} nd}| s,t�d��| d dkrFt| �\}} n*| d tkrdt�d�| ���n t| �\}} |dk r�|g|dd�< || fS )a� word = atom / quoted-string
Either atom or quoted-string may start with CFWS. We have to peel off this
CFWS first to determine which type of word to parse. Afterward we splice
the leading CFWS, if any, into the parsed sub-token.
If neither an atom or a quoted-string is found before the next special, a
HeaderParseError is raised.
The token returned is either an Atom or a QuotedString, as appropriate.
This means the 'word' level of the formal grammar is not represented in the
parse tree; this is because having that extra layer when manipulating the
parse tree is more confusing than it is helpful.
r Nz5Expected 'atom' or 'quoted-string' but found nothing.r
z1Expected 'atom' or 'quoted-string' but found '{}')r3 r4 r r r5 �SPECIALSr* r7 )r �leaderr6 r r r �get_word\ s" � � r< c C s� t � }zt| �\}} |�|� W n( tjk
rH |j�t�d�� Y nX | r�| d tkr�| d dkr�|�t� |j�t� d�� | dd� } qJzt| �\}} W nD tjk
r� | d t
kr�t | �\}} |j�t� d�� n� Y nX |�|� qJ|| fS )a� phrase = 1*word / obs-phrase
obs-phrase = word *(word / "." / CFWS)
This means a phrase can be a sequence of words, periods, and CFWS in any
order as long as it starts with at least one word. If anything other than
words is detected, an ObsoleteHeaderDefect is added to the token's defect
list. We also accept a phrase that starts with CFWS followed by a dot;
this is registered as an InvalidHeaderDefect, since it is not supported by
even the obsolete grammar.
z phrase does not start with wordr r zperiod in 'phrase'r� Nzcomment found without atom) rU r< rh r r r r� � PHRASE_ENDSr� �ObsoleteHeaderDefectr3 r4 )r rV r6 r r r �
get_phrase~ s4
�
�
� r? c C sv t � }d}| d tkr"t| �\}} | s6t�d�| ���zt| �\}} W n^ tjk
r� zt| �\}} W n6 tjk
r� | d dkr�| d tkr�� t � }Y nX Y nX |dk r�|g|dd�< |�
|� | �r4| d dks�| d tk�r4t t |�| �\}} |j
dk�r|j�
t�d�� n|j�
t�d�� ||d< z|j�d� W n( tk
�rl |j�
t�d �� Y nX || fS )
z= local-part = dot-atom / quoted-string / obs-local-part
Nr z"expected local-part but found '{}'r �invalid-obs-local-partz<local-part is not dot-atom, quoted-string, or obs-local-partz,local-part is not a dot-atom (contains CFWS)�asciiz)local-part contains non-ASCII characters))r� r3 r4 r r r* r9 r< r= r rh �get_obs_local_partr
rD r r� r> r �encoder� ZNonASCIILocalPartDefect)r r� r; r6 �obs_local_partr r r �get_local_part� sJ �
�
�
� rE c C s� t � }d}| �r(| d dks*| d tk�r(| d dkrj|rL|j�t�d�� |�t� d}| dd� } q
nD| d dkr�|�t| d d �� | dd� } |j�t�d
�� d}q
|r�|d jd kr�|j�t�d
�� zt | �\}} d}W n4 tj
k
�r | d t k�r
� t | �\}} Y nX |�|� q
|d jd k�sX|d jdk�rj|d jd k�rj|j�t�d�� |d jd k�s�|d jdk�r�|d jd k�r�|j�t�d�� |j�r�d|_|| fS )z' obs-local-part = word *("." word)
Fr r r zinvalid repeated '.'Tr� N�misplaced-specialz/'\' character outside of quoted-string/ccontentr� r� zmissing '.' between wordsrY z!Invalid leading '.' in local partr# z"Invalid trailing '.' in local partr@ )
r� r= r rh r r� r� r rD r< r r3 r4 )r rD Zlast_non_ws_was_dotr6 r r r rB � sj
�
�
�
� � �
� � �
�rB c C s@ t | d�\}} }t|d�}|r0|j�t�d�� t|� || fS )a dtext = <printable ascii except \ [ ]> / obs-dtext
obs-dtext = obs-NO-WS-CTL / quoted-pair
We allow anything except the excluded characters, but if we find any
ASCII other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Quoted pairs are converted to their
unquoted values, so what is returned is a ptext token, in this case a
ValueTerminal. If there were quoted-printables, an ObsoleteHeaderDefect is
added to the returned token's defect list.
z[]r� z(quoted printable found in domain-literal)r r r rh r r> r )r r� r r r r � get_dtext� s
�rG c C s, | rdS |� t�d�� |� tdd�� dS )NFz"end of input inside domain-literal�]�domain-literal-endT)rh r r� r )r �domain_literalr r r �_check_for_early_dl_end s �rK c C sj t � }| d tkr(t| �\}} |�|� | s6t�d��| d dkrRt�d�| ���| dd� } t| |�rp|| fS |�tdd�� | d t kr�t
| �\}} |�|� t | �\}} |�|� t| |�r�|| fS | d t kr�t
| �\}} |�|� t| |�r�|| fS | d dk�r t�d �| ���|�tdd
�� | dd� } | �rb| d tk�rbt| �\}} |�|� || fS ) zB domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
r zexpected domain-literal�[z6expected '[' at start of domain-literal but found '{}'r� Nzdomain-literal-startrH z4expected ']' at end of domain-literal but found '{}'rI ) r� r3 r4 rh r r r* rK r r r rG )r rJ r6 r r r �get_domain_literal sH
�
�
rM c C sr t � }d}| d tkr"t| �\}} | s6t�d�| ���| d dkrvt| �\}} |dk rd|g|dd�< |�|� || fS zt| �\}} W n" tjk
r� t | �\}} Y nX | r�| d dkr�t�d��|dk r�|g|dd�< |�|� | �rj| d dk�rj|j
�t� d�� |d j d k�r*|d |dd�< | �rj| d dk�rj|�t
� t | d
d� �\}} |�|� �q*|| fS ) z] domain = dot-atom / domain-literal / obs-domain
obs-domain = atom *("." atom))
Nr z expected domain but found '{}'rL r� zInvalid Domainr z(domain is not a dot-atom (contains CFWS)r� r� )r� r3 r4 r r r* rM rh r9 r7 r r> rD r� )r r� r; r6 r r r �
get_domain= sD �
�
rN c C s| t � }t| �\}} |�|� | r,| d dkrF|j�t�d�� || fS |�tdd�� t| dd� �\}} |�|� || fS )z( addr-spec = local-part "@" domain
r r� z#addr-spec local part with no domain�address-at-symbolr� N)r� rE rh r r r� r rN )r r� r6 r r r �
get_addr_specc s
�
rP c C s� t � }| rj| d dks"| d tkrj| d tkrFt| �\}} |�|� q| d dkr|�t� | dd� } q| rz| d dkr�t�d�| ���|�t� t | dd� �\}} |�|� | �r>| d dk�r>|�t� | dd� } | s�q>| d tk�rt| �\}} |�|� | d dkr�|�t� t | dd� �\}} |�|� q�| �sNt�d��| d dk�rlt�d �| ���|�t
dd
�� || dd� fS ) z� obs-route = obs-domain-list ":"
obs-domain-list = *(CFWS / ",") "@" domain *("," [CFWS] ["@" domain])
Returns an obs-route token with the appropriate sub-tokens (that is,
there is no obs-domain-list in the parse tree).
r r r� Nr� z(expected obs-route domain but found '{}'z%end of header while parsing obs-route�:z4expected ':' marking end of obs-route but found '{}'zend-of-obs-route-marker) r� r3 r4 rh �
ListSeparatorr r r* �RouteComponentMarkerrN r )r Z obs_router6 r r r �
get_obs_routes sF
�
�rT c C s� t � }| d tkr(t| �\}} |�|� | r8| d dkrHt�d�| ���|�tdd�� | dd� } | d dkr�|�tdd�� |j�t� d �� | dd� } || fS zt
| �\}} W nz tjk
�r0 z"t | �\}} |j�t� d
�� W n( tjk
�r t�d �| ���Y nX |�|� t
| �\}} Y nX |�|� | �r^| d dk�r^| dd� } n|j�t� d �� |�tdd�� | �r�| d tk�r�t| �\}} |�|� || fS )
z� angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
obs-angle-addr = [CFWS] "<" obs-route addr-spec ">" [CFWS]
r �<z"expected angle-addr but found '{}'zangle-addr-startr� N�>zangle-addr-endz null addr-spec in angle-addrz*obsolete route specification in angle-addrz.expected addr-spec or obs-route but found '{}'z"missing trailing '>' on angle-addr)
r� r3 r4 rh r r r* r r r� rP rT r> )r Z
angle_addrr6 r r r �get_angle_addr� sT
�
�
�
�
�
rW c C s< t � }t| �\}} |�|dd� � |jdd� |_|| fS )z� display-name = phrase
Because this is simply a name-rule, we don't return a display-name
token containing a phrase, but rather a display-name token with
the content of the phrase.
N)r� r? r4 r )r r~ r6 r r r �get_display_name� s
rX c C s� t � }d}| d tkr6t| �\}} | s6t�d�|���| d dkr�| d tkr^t�d�| ���t| �\}} | s~t�d�|���|dk r�|g|d dd�< d}|�|� t | �\}} |dk r�|g|dd�< |�|� || fS )z, name-addr = [display-name] angle-addr
Nr z!expected name-addr but found '{}'rU )
r� r3 r4 r r r* r= rX rh rW )r Z name_addrr; r6 r r r �
get_name_addr� s6 � � �
rY c C s� t � }zt| �\}} W nN tjk
rd zt| �\}} W n& tjk
r^ t�d�| ���Y nX Y nX tdd� |jD ��r�d|_|� |� || fS )z& mailbox = name-addr / addr-spec
z expected mailbox but found '{}'c s s | ]}t |tj�V qd S r )r� r r� r r r r r# s �z get_mailbox.<locals>.<genexpr>r� )
r� rY r r rP r* �anyr- rD rh )r r� r6 r r r � get_mailbox� s ��
r[ c C sd t � }| r\| d |kr\| d tkrD|�t| d d�� | dd� } qt| �\}} |�|� q|| fS )z� Read everything up to one of the chars in endchars.
This is outside the formal grammar. The InvalidMailbox TokenList that is
returned acts like a Mailbox, but the data attributes are None.
r rF r� N)r� r= rh r r? )r r Zinvalid_mailboxr6 r r r �get_invalid_mailbox s � r\ c C s� t � }| �r�| d dk�r�z t| �\}} |�|� W �n tjk
�r< d}| d tkr�t| �\}} | rv| d dkr�|�|� |j�t�d�� n@t | d�\}} |dk r�|g|dd�< |�|� |j�t�
d�� nb| d dkr�|j�t�d�� nBt | d�\}} |dk �r |g|dd�< |�|� |j�t�
d�� Y nX | �r�| d dk�r�|d }d |_ t | d�\}} |� |� |j�t�
d�� | r| d dkr|�t
� | d
d� } q|| fS ) aJ mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
obs-mbox-list = *([CFWS] ",") mailbox *("," [mailbox / CFWS])
For this routine we go outside the formal grammar in order to improve error
handling. We recognize the end of the mailbox list only at the end of the
value or at a ';' (the group terminator). This is so that we can turn
invalid mailboxes into InvalidMailbox tokens and continue parsing any
remaining valid mailboxes. We also allow all mailbox entries to be null,
and this condition is handled appropriately at a higher level.
r �;Nz,;z empty element in mailbox-listz invalid mailbox in mailbox-listr r� r� r� )r� r[ rh r r r3 r4 r r> r\ r� rD r4 rR )r Z mailbox_listr6 r; r� r r r �get_mailbox_list sX
�
�
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r^ c C s t � }| s$|j�t�d�� || fS d}| r�| d tkr�t| �\}} | sl|j�t�d�� |�|� || fS | d dkr�|�|� || fS t| �\}} t|j �dkr�|dk r�|�|� |�
|� |j�t� d�� || fS |dk r�|g|dd�< |�|� || fS )zg group-list = mailbox-list / CFWS / obs-group-list
obs-group-list = 1*([CFWS] ",") [CFWS]
z end of header before group-listNr zend of header in group-listr] z group-list with empty entries) r� r rh r r� r3 r4 r^ r� rz r4 r> )r Z
group_listr; r6 r r r �get_group_listW s>
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r_ c C s t � }t| �\}} | r"| d dkr2t�d�| ���|�|� |�tdd�� | dd� } | r�| d dkr�|�tdd�� || dd� fS t| �\}} |�|� | s�|j�t� d �� n | d dkr�t�d
�| ���|�tdd�� | dd� } | �r| d t
k�rt | �\}} |�|� || fS ) z7 group = display-name ":" [group-list] ";" [CFWS]
r rQ z8expected ':' at end of group display name but found '{}'z group-display-name-terminatorr� Nr] zgroup-terminatorzend of header in groupz)expected ';' at end of group but found {}) r� rX r r r* rh r r_ r r� r3 r4 )r r| r6 r r r � get_group| s8 �
� �
r` c C sx t � }zt| �\}} W nN tjk
rd zt| �\}} W n& tjk
r^ t�d�| ���Y nX Y nX |�|� || fS )a� address = mailbox / group
Note that counter-intuitively, an address can be either a single address or
a list of addresses (a group). This is why the returned Address object has
a 'mailboxes' attribute which treats a single address as a list of length
one. When you need to differentiate between to two cases, extract the single
element, which is either a mailbox or a group token.
z expected address but found '{}')r{ r` r r r[ r* rh )r rr r6 r r r � get_address� s �
ra c
C s� t � }| �r�z t| �\}} |�|� W �n tjk
�rH } z�d}| d tkr�t| �\}} | rj| d dkr�|�|� |j�t�d�� nFt | d�\}} |dk r�|g|dd�< |�t
|g�� |j�t� d�� nh| d dkr�|j�t�d�� nHt | d�\}} |dk �r|g|dd�< |�t
|g�� |j�t� d�� W 5 d}~X Y nX | �r�| d dk�r�|d d }d|_ t | d�\}} |�
|� |j�t� d�� | r|�tdd �� | d
d� } q|| fS ) a� address_list = (address *("," address)) / obs-addr-list
obs-addr-list = *([CFWS] ",") address *("," [address / CFWS])
We depart from the formal grammar here by continuing to parse until the end
of the input, assuming the input to be entirely composed of an
address-list. This is always true in email parsing, and allows us
to skip invalid addresses to parse additional valid ones.
Nr r z"address-list entry with no contentz invalid address in address-listz empty element in address-listr� r� r r� )rq ra rh r r r3 r4 r r> r\ r{ r� rD r4 r )r Z address_listr6 �errr; r� r r r �get_address_list� sX
�
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�rc c C s� t � }| st�d�| ���| d dkr6t�d�| ���|�tdd�� | dd� } t| �\}} |�|� | rx| d dkr�t�d �| ���|�tdd
�� || dd� fS ) z& no-fold-literal = "[" *dtext "]"
z'expected no-fold-literal but found '{}'r rL z;expected '[' at the start of no-fold-literal but found '{}'zno-fold-literal-startr� NrH z9expected ']' at the end of no-fold-literal but found '{}'zno-fold-literal-end)r� r r r* rh r rG )r Zno_fold_literalr6 r r r �get_no_fold_literal� s. � ��
��rd c C s� t � }| r,| d tkr,t| �\}} |�|� | r<| d dkrLt�d�| ���|�tdd�� | dd� } zt| �\}} W n` tjk
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�t� d�� |�td d �� | �r�| d tk�r�t| �\}} |�|� || fS )z�msg-id = [CFWS] "<" id-left '@' id-right ">" [CFWS]
id-left = dot-atom-text / obs-id-left
id-right = dot-atom-text / no-fold-literal / obs-id-right
no-fold-literal = "[" *dtext "]"
r rU z expected msg-id but found '{}'z msg-id-startr� Nzobsolete id-left in msg-idz4expected dot-atom-text or obs-id-left but found '{}'r� zmsg-id with no id-rightrV z
msg-id-endrO zobsolete id-right in msg-idzFexpected dot-atom-text, no-fold-literal or obs-id-right but found '{}'z missing trailing '>' on msg-id)r� r3 r4 rh r r r* r r8 rB r r> r� rd rN )r Zmsg_idr6 �er r r �
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rl } z,t| �}t|�}|j�t�d� |��� W 5 d}~X Y n X | r�|j�t�d� | ��� |S )z2message-id = "Message-ID:" msg-id CRLF
zInvalid msg-id: {!r}NzUnexpected {!r})
r� rf rh r r r( r� r r� r* )r Z
message_idr6 Zexr r r �parse_message_idI s �
�rg c C s� t � }| s |j�t�d�� |S | d tkrXt| �\}} |�|� | sX|j�t�d�� d}| r�| d dkr�| d tkr�|| d 7 }| dd� } q\|�� s�|j�t�d� |��� |�t
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�� | �rn| d tk�rnt| �\}} |�|� | �r�|j�t�d�� |�t
| d �� |S )zE mime-version = [CFWS] 1*digit [CFWS] "." [CFWS] 1*digit [CFWS]
z%Missing MIME version number (eg: 1.0)r z0Expected MIME version number but found only CFWSr r r� Nz1Expected MIME major version number but found {!r}r
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�rl c C sd t � }| r\| d dkr\| d tkrD|�t| d d�� | dd� } qt| �\}} |�|� q|| fS )z� Read everything up to the next ';'.
This is outside the formal grammar. The InvalidParameter TokenList that is
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r r] rF r� N)r� r= rh r r? )r Zinvalid_parameterr6 r r r �get_invalid_parameter� s � rm c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )a8 ttext = <matches _ttext_matcher>
We allow any non-TOKEN_ENDS in ttext, but add defects to the token's
defects list if we find non-ttext characters. We also register defects for
*any* non-printables even though the RFC doesn't exclude all of them,
because we follow the spirit of RFC 5322.
z expected ttext but found '{}'N�ttext)�_non_token_end_matcherr r r* r| r� r r )r r/ rn r r r � get_ttext� s �
rp c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )z�token = [CFWS] 1*ttext [CFWS]
The RFC equivalent of ttext is any US-ASCII chars except space, ctls, or
tspecials. We also exclude tabs even though the RFC doesn't.
The RFC implies the CFWS but is not explicit about it in the BNF.
r � expected token but found '{}') r\ r3 r4 rh �
TOKEN_ENDSr r r* rp )r Zmtokenr6 r r r � get_token� s
�
rs c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )aQ attrtext = 1*(any non-ATTRIBUTE_ENDS character)
We allow any non-ATTRIBUTE_ENDS in attrtext, but add defects to the
token's defects list if we find non-attrtext characters. We also register
defects for *any* non-printables even though the RFC doesn't exclude all of
them, because we follow the spirit of RFC 5322.
z expected attrtext but found {!r}Nr� )�_non_attribute_end_matcherr r r* r| r� r r �r r/ r� r r r � get_attrtext� s �
rv c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )aH [CFWS] 1*attrtext [CFWS]
This version of the BNF makes the CFWS explicit, and as usual we use a
value terminal for the actual run of characters. The RFC equivalent of
attrtext is the token characters, with the subtraction of '*', "'", and '%'.
We include tab in the excluded set just as we do for token.
r rq ) r� r3 r4 rh �ATTRIBUTE_ENDSr r r* rv �r r� r6 r r r �
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ry c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )z�attrtext = 1*(any non-ATTRIBUTE_ENDS character plus '%')
This is a special parsing routine so that we get a value that
includes % escapes as a single string (which we decode as a single
string later).
z)expected extended attrtext but found {!r}N�extended-attrtext)�#_non_extended_attribute_end_matcherr r r* r| r� r r ru r r r �get_extended_attrtext s �
r| c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )z� [CFWS] 1*extended_attrtext [CFWS]
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r rq ) r� r3 r4 rh �EXTENDED_ATTRIBUTE_ENDSr r r* r| rx r r r �get_extended_attribute! s
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r~ c C s� t � }| r| d dkr&t�d�| ���|�tdd�� | dd� } | rR| d �� sbt�d�| ���d}| r�| d �� r�|| d 7 }| dd� } qf|d d kr�|d kr�|j�t�d
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The formal BNF is more complicated because leading 0s are not allowed. We
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The caller should already have dealt with leading CFWS.
r �*z Expected section but found {}zsection-markerr� Nz$Expected section number but found {}r �0z'section number has an invalid leading 0rh ) r� r r r* rh r rj r ZInvalidHeaderErrorrk r� )r r� rh r r r � get_section7 s, � �
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r� c C s� t � }| st�d��d}| d tkr0t| �\}} | sDt�d�|���| d dkr^t| �\}} n t| �\}} |dk r�|g|dd�< |�|� || fS )z quoted-string / attribute
z&Expected value but found end of stringNr z Expected value but found only {}r
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recovery and working with the resulting parse tree easier.
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parameters to be treated as its own TokenList.
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Nr r] z parameter entry with no contentzinvalid parameter {!r}r� r� z)parameter with invalid trailing text {!r}r� r� )r� r� rh r r r3 r4 r r� rm r* rD r4 r )r Zmime_parametersr6 rb r; r� r r r �parse_mime_parameters� sJ
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�� |�t| dd � �� |S )z� maintype "/" subtype *( ";" parameter )
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Fz"Missing content type specificationz(Expected content maintype but found {!r}r r� zInvalid content typezcontent-type-separatorr� Nz'Expected content subtype but found {!r}r] z<Only parameters are valid after content type, but found {!r}r� )r� r rh r ri rs r r� r* r� r r� �lowerr� r r� r� )r ZctypeZrecoverr6 r r r �parse_content_type_header=
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If there is already an encoded word in the last line of lines (indicated by
a non-None value for last_ew) and ew_combine_allowed is true, decode the
existing ew, combine it with to_encode, and re-encode. Otherwise, encode
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The parsing methods defined in this module implement various email related
parsing rules. Principal among them is RFC 5322, which is the followon
to RFC 2822 and primarily a clarification of the former. It also implements
RFC 2047 encoded word decoding.
RFC 5322 goes to considerable trouble to maintain backward compatibility with
RFC 822 in the parse phase, while cleaning up the structure on the generation
phase. This parser supports correct RFC 5322 generation by tagging white space
as folding white space only when folding is allowed in the non-obsolete rule
sets. Actually, the parser is even more generous when accepting input than RFC
5322 mandates, following the spirit of Postel's Law, which RFC 5322 encourages.
Where possible deviations from the standard are annotated on the 'defects'
attribute of tokens that deviate.
The general structure of the parser follows RFC 5322, and uses its terminology
where there is a direct correspondence. Where the implementation requires a
somewhat different structure than that used by the formal grammar, new terms
that mimic the closest existing terms are used. Thus, it really helps to have
a copy of RFC 5322 handy when studying this code.
Input to the parser is a string that has already been unfolded according to
RFC 5322 rules. According to the RFC this unfolding is the very first step, and
this parser leaves the unfolding step to a higher level message parser, which
will have already detected the line breaks that need unfolding while
determining the beginning and end of each header.
The output of the parser is a TokenList object, which is a list subclass. A
TokenList is a recursive data structure. The terminal nodes of the structure
are Terminal objects, which are subclasses of str. These do not correspond
directly to terminal objects in the formal grammar, but are instead more
practical higher level combinations of true terminals.
All TokenList and Terminal objects have a 'value' attribute, which produces the
semantically meaningful value of that part of the parse subtree. The value of
all whitespace tokens (no matter how many sub-tokens they may contain) is a
single space, as per the RFC rules. This includes 'CFWS', which is herein
included in the general class of whitespace tokens. There is one exception to
the rule that whitespace tokens are collapsed into single spaces in values: in
the value of a 'bare-quoted-string' (a quoted-string with no leading or
trailing whitespace), any whitespace that appeared between the quotation marks
is preserved in the returned value. Note that in all Terminal strings quoted
pairs are turned into their unquoted values.
All TokenList and Terminal objects also have a string value, which attempts to
be a "canonical" representation of the RFC-compliant form of the substring that
produced the parsed subtree, including minimal use of quoted pair quoting.
Whitespace runs are not collapsed.
Comment tokens also have a 'content' attribute providing the string found
between the parens (including any nested comments) with whitespace preserved.
All TokenList and Terminal objects have a 'defects' attribute which is a
possibly empty list all of the defects found while creating the token. Defects
may appear on any token in the tree, and a composite list of all defects in the
subtree is available through the 'all_defects' attribute of any node. (For
Terminal notes x.defects == x.all_defects.)
Each object in a parse tree is called a 'token', and each has a 'token_type'
attribute that gives the name from the RFC 5322 grammar that it represents.
Not all RFC 5322 nodes are produced, and there is one non-RFC 5322 node that
may be produced: 'ptext'. A 'ptext' is a string of printable ascii characters.
It is returned in place of lists of (ctext/quoted-pair) and
(qtext/quoted-pair).
XXX: provide complete list of token types.
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{}{}/{}({}){}r z {})r* r r+ rD r r, r r@ r r r rC | s �z Terminal._ppc C s d S r r r& r r r �pop_trailing_ws� s zTerminal.pop_trailing_wsc C s g S r r r& r r r r5 � s zTerminal.commentsc C s t | �| jfS r )r
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r� c @ s e Zd Zedd� �Zdd� ZdS )�WhiteSpaceTerminalc C s dS rM r r& r r r r � s zWhiteSpaceTerminal.valuec C s dS )NTr r& r r r r0 � s z!WhiteSpaceTerminal.startswith_fwsN�r+ rF rG rJ r r0 r r r r r � s
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ValueTerminalc C s | S r r r& r r r r � s zValueTerminal.valuec C s dS )NFr r& r r r r0 � s z ValueTerminal.startswith_fwsNr r r r r r � s
r c @ s e Zd Zedd� �Zdd� ZdS )�EWWhiteSpaceTerminalc C s dS r� r r& r r r r � s zEWWhiteSpaceTerminal.valuec C s dS r� r r& r r r r' � s z EWWhiteSpaceTerminal.__str__N)r+ rF rG rJ r r' r r r r r � s
r c @ s e Zd ZdZdS )�_InvalidEwErrorz1Invalid encoded word found while parsing headers.N)r+ rF rG �__doc__r r r r r � s r r� �,�list-separatorr� zroute-component-markerz([{}]+)r z[^{}]+z[\x00-\x20\x7F]c C s> t | �}|r | j�t�|�� t�| �r:| j�t�d�� dS )z@If input token contains ASCII non-printables, register a defect.z*Non-ASCII characters found in header tokenN)�_non_printable_finderr rh r ZNonPrintableDefectr r� r� )�xtextZnon_printablesr r r �_validate_xtext� s
�r c C s� t | d�^}}g }d}d}tt|��D ]L}|| dkrJ|rDd}d}nd}q&|rTd}n|| |krd q||�|| � q&|d }d�|�d�||d� g| �|fS )ak Scan printables/quoted-pairs until endchars and return unquoted ptext.
This function turns a run of qcontent, ccontent-without-comments, or
dtext-with-quoted-printables into a single string by unquoting any
quoted printables. It returns the string, the remaining value, and
a flag that is True iff there were any quoted printables decoded.
r� Fr Tr N)�
_wsp_splitter�ranger� rh r% )r �endcharsZfragment� remainderZvchars�escape�had_qp�posr r r �_get_ptext_to_endchars� s$ r c C s. | � � }t| dt| �t|� � d�}||fS )z�FWS = 1*WSP
This isn't the RFC definition. We're using fws to represent tokens where
folding can be done, but when we are parsing the *un*folding has already
been done so we don't need to watch out for CRLF.
N�fws)r� r r� )r Znewvaluer r r r �get_fws s r c
C s� t � }| �d�s t�d�| ���| dd� �dd�^}}|| dd� krXt�d�| ���d�|�}t|�dkr�|d tkr�|d tkr�|� d �dk r�|�dd�^}}|d | }t|�� �dkr�|j
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�� || fS )zE encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
�=?z"expected encoded word but found {}r� Nz?=r� r r �?z whitespace inside encoded wordz!encoded word format invalid: '{}'�vtextz.missing trailing whitespace after encoded-word)r] �
startswithr �HeaderParseErrorr* r� r% r� r �countr rh r� r_ �_ewr� �
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r Zewr� r Zremstr�restr� r` ra r r6 �charsr r r r �get_encoded_word sd
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aO unstructured = (*([FWS] vchar) *WSP) / obs-unstruct
obs-unstruct = *((*LF *CR *(obs-utext) *LF *CR)) / FWS)
obs-utext = %d0 / obs-NO-WS-CTL / LF / CR
obs-NO-WS-CTL is control characters except WSP/CR/LF.
So, basically, we have printable runs, plus control characters or nulls in
the obsolete syntax, separated by whitespace. Since RFC 2047 uses the
obsolete syntax in its specification, but requires whitespace on either
side of the encoded words, I can see no reason to need to separate the
non-printable-non-whitespace from the printable runs if they occur, so we
parse this into xtext tokens separated by WSP tokens.
Because an 'unstructured' value must by definition constitute the entire
value, this 'get' routine does not return a remaining value, only the
parsed TokenList.
r Tr Fr� r z&missing whitespace before encoded wordr� ���r^ r r )rR r r rh r r" r r r r� rD r r� r r �rfc2047_matcher�search� partitionr r r% )r rS r6 �valid_ewZhave_wsr� r r r r r �get_unstructured? sJ
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r( c C s* t | d�\}} }t|d�}t|� || fS )a ctext = <printable ascii except \ ( )>
This is not the RFC ctext, since we are handling nested comments in comment
and unquoting quoted-pairs here. We allow anything except the '()'
characters, but if we find any ASCII other than the RFC defined printable
ASCII, a NonPrintableDefect is added to the token's defects list. Since
quoted pairs are converted to their unquoted values, what is returned is
a 'ptext' token. In this case it is a WhiteSpaceTerminal, so it's value
is ' '.
z()r� )r r r �r r� �_r r r � get_qp_ctext� s
r+ c C s* t | d�\}} }t|d�}t|� || fS )ao qcontent = qtext / quoted-pair
We allow anything except the DQUOTE character, but if we find any ASCII
other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Any quoted pairs are converted to their
unquoted values, so what is returned is a 'ptext' token. In this case it
is a ValueTerminal.
r
r� )r r r r) r r r � get_qcontent� s
r, c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )z�atext = <matches _atext_matcher>
We allow any non-ATOM_ENDS in atext, but add an InvalidATextDefect to
the token's defects list if we find non-atext characters.
z expected atext but found '{}'N�atext)�_non_atom_end_matcherr r r* r| r� r r )r �mr- r r r � get_atext� s �
r0 c C sr | d dkr t �d�| ���t� }| dd� } | rT| d dkrTt| �\}} |�|� | �rB| d dk�rB| d tkr�t| �\}} n�| dd� dk�r*d}z&t| �\}} |j �t �
d �� d
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r� t| �\}} Y nX |�r6t |�dk�r6|d j d k�r6|d
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d�� || fS || dd� fS )z�bare-quoted-string = DQUOTE *([FWS] qcontent) [FWS] DQUOTE
A quoted-string without the leading or trailing white space. Its
value is the text between the quote marks, with whitespace
preserved and quoted pairs decoded.
r r
zexpected '"' but found '{}'r� Nr� r Fz!encoded word inside quoted stringTr� r r# r^ z"end of header inside quoted string)r r r* rm r, rh r r r" r r� r� rD r )r Zbare_quoted_stringr6 r' r r r �get_bare_quoted_string� sL �
� � �
�r1 c C s� | r | d dkr t �d�| ���t� }| dd� } | r�| d dkr�| d tkr\t| �\}} n&| d dkrvt| �\}} n t| �\}} |�|� q2| s�|j �t �
d�� || fS || dd� fS )z�comment = "(" *([FWS] ccontent) [FWS] ")"
ccontent = ctext / quoted-pair / comment
We handle nested comments here, and quoted-pair in our qp-ctext routine.
r r zexpected '(' but found '{}'r� Nrp z end of header inside comment) r r r* rn r r � get_commentr+ rh r r� )r rO r6 r r r r2 � s& �
�r2 c C sP t � }| rH| d tkrH| d tkr0t| �\}} n t| �\}} |�|� q|| fS )z,CFWS = (1*([FWS] comment) [FWS]) / FWS
r )rX � CFWS_LEADERr r r2 rh )r rY r6 r r r �get_cfws� s r4 c C sp t � }| r,| d tkr,t| �\}} |�|� t| �\}} |�|� | rh| d tkrht| �\}} |�|� || fS )z�quoted-string = [CFWS] <bare-quoted-string> [CFWS]
'bare-quoted-string' is an intermediate class defined by this
parser and not by the RFC grammar. It is the quoted string
without any attached CFWS.
r )rb r3 r4 rh r1 )r Z
quoted_stringr6 r r r �get_quoted_string s
r5 c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���| �d�r�zt | �\}} W q� tjk
r� t
| �\}} Y q�X n t
| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )zPatom = [CFWS] 1*atext [CFWS]
An atom could be an rfc2047 encoded word.
r z expected atom but found '{}'r ) rZ r3 r4 rh � ATOM_ENDSr r r* r r" r0 )r r[ r6 r r r �get_atom s&
�
r7 c C s� t � }| r| d tkr&t�d�| ���| rt| d tkrtt| �\}} |�|� | r&| d dkr&|�t� | dd� } q&|d tkr�t�d�d| ���|| fS )z( dot-text = 1*atext *("." 1*atext)
r z8expected atom at a start of dot-atom-text but found '{}'r r� Nr� z4expected atom at end of dot-atom-text but found '{}')r� r6 r r r* r0 rh r� )r Z
dot_atom_textr6 r r r �get_dot_atom_text0 s �
�r8 c C s� t � }| d tkr(t| �\}} |�|� | �d�rhzt| �\}} W qt tjk
rd t| �\}} Y qtX n t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )z� dot-atom = [CFWS] dot-atom-text [CFWS]
Any place we can have a dot atom, we could instead have an rfc2047 encoded
word.
r r ) r� r3 r4 rh r r" r r r8 )r Zdot_atomr6 r r r � get_dot_atomC s
r9 c C s� | d t krt| �\}} nd}| s,t�d��| d dkrFt| �\}} n*| d tkrdt�d�| ���n t| �\}} |dk r�|g|dd�< || fS )a� word = atom / quoted-string
Either atom or quoted-string may start with CFWS. We have to peel off this
CFWS first to determine which type of word to parse. Afterward we splice
the leading CFWS, if any, into the parsed sub-token.
If neither an atom or a quoted-string is found before the next special, a
HeaderParseError is raised.
The token returned is either an Atom or a QuotedString, as appropriate.
This means the 'word' level of the formal grammar is not represented in the
parse tree; this is because having that extra layer when manipulating the
parse tree is more confusing than it is helpful.
r Nz5Expected 'atom' or 'quoted-string' but found nothing.r
z1Expected 'atom' or 'quoted-string' but found '{}')r3 r4 r r r5 �SPECIALSr* r7 )r �leaderr6 r r r �get_word\ s" � � r< c C s� t � }zt| �\}} |�|� W n( tjk
rH |j�t�d�� Y nX | r�| d tkr�| d dkr�|�t� |j�t� d�� | dd� } qJzt| �\}} W nD tjk
r� | d t
kr�t | �\}} |j�t� d�� n� Y nX |�|� qJ|| fS )a� phrase = 1*word / obs-phrase
obs-phrase = word *(word / "." / CFWS)
This means a phrase can be a sequence of words, periods, and CFWS in any
order as long as it starts with at least one word. If anything other than
words is detected, an ObsoleteHeaderDefect is added to the token's defect
list. We also accept a phrase that starts with CFWS followed by a dot;
this is registered as an InvalidHeaderDefect, since it is not supported by
even the obsolete grammar.
z phrase does not start with wordr r zperiod in 'phrase'r� Nzcomment found without atom) rU r< rh r r r r� � PHRASE_ENDSr� �ObsoleteHeaderDefectr3 r4 )r rV r6 r r r �
get_phrase~ s4
�
�
� r? c C sv t � }d}| d tkr"t| �\}} | s6t�d�| ���zt| �\}} W n^ tjk
r� zt| �\}} W n6 tjk
r� | d dkr�| d tkr�� t � }Y nX Y nX |dk r�|g|dd�< |�
|� | �r4| d dks�| d tk�r4t t |�| �\}} |j
dk�r|j�
t�d�� n|j�
t�d�� ||d< z|j�d� W n( tk
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t�d �� Y nX || fS )
z= local-part = dot-atom / quoted-string / obs-local-part
Nr z"expected local-part but found '{}'r �invalid-obs-local-partz<local-part is not dot-atom, quoted-string, or obs-local-partz,local-part is not a dot-atom (contains CFWS)�asciiz)local-part contains non-ASCII characters))r� r3 r4 r r r* r9 r< r= r rh �get_obs_local_partr
rD r r� r> r �encoder� ZNonASCIILocalPartDefect)r r� r; r6 �obs_local_partr r r �get_local_part� sJ �
�
�
� rE c C s� t � }d}| �r(| d dks*| d tk�r(| d dkrj|rL|j�t�d�� |�t� d}| dd� } q
nD| d dkr�|�t| d d �� | dd� } |j�t�d
�� d}q
|r�|d jd kr�|j�t�d
�� zt | �\}} d}W n4 tj
k
�r | d t k�r
� t | �\}} Y nX |�|� q
|d jd k�sX|d jdk�rj|d jd k�rj|j�t�d�� |d jd k�s�|d jdk�r�|d jd k�r�|j�t�d�� |j�r�d|_|| fS )z' obs-local-part = word *("." word)
Fr r r zinvalid repeated '.'Tr� N�misplaced-specialz/'\' character outside of quoted-string/ccontentr� r� zmissing '.' between wordsrY z!Invalid leading '.' in local partr# z"Invalid trailing '.' in local partr@ )
r� r= r rh r r� r� r rD r< r r3 r4 )r rD Zlast_non_ws_was_dotr6 r r r rB � sj
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�rB c C s@ t | d�\}} }t|d�}|r0|j�t�d�� t|� || fS )a dtext = <printable ascii except \ [ ]> / obs-dtext
obs-dtext = obs-NO-WS-CTL / quoted-pair
We allow anything except the excluded characters, but if we find any
ASCII other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Quoted pairs are converted to their
unquoted values, so what is returned is a ptext token, in this case a
ValueTerminal. If there were quoted-printables, an ObsoleteHeaderDefect is
added to the returned token's defect list.
z[]r� z(quoted printable found in domain-literal)r r r rh r r> r )r r� r r r r � get_dtext� s
�rG c C s, | rdS |� t�d�� |� tdd�� dS )NFz"end of input inside domain-literal�]�domain-literal-endT)rh r r� r )r �domain_literalr r r �_check_for_early_dl_end s �rK c C sj t � }| d tkr(t| �\}} |�|� | s6t�d��| d dkrRt�d�| ���| dd� } t| |�rp|| fS |�tdd�� | d t kr�t
| �\}} |�|� t | �\}} |�|� t| |�r�|| fS | d t kr�t
| �\}} |�|� t| |�r�|| fS | d dk�r t�d �| ���|�tdd
�� | dd� } | �rb| d tk�rbt| �\}} |�|� || fS ) zB domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
r zexpected domain-literal�[z6expected '[' at start of domain-literal but found '{}'r� Nzdomain-literal-startrH z4expected ']' at end of domain-literal but found '{}'rI ) r� r3 r4 rh r r r* rK r r r rG )r rJ r6 r r r �get_domain_literal sH
�
�
rM c C sr t � }d}| d tkr"t| �\}} | s6t�d�| ���| d dkrvt| �\}} |dk rd|g|dd�< |�|� || fS zt| �\}} W n" tjk
r� t | �\}} Y nX | r�| d dkr�t�d��|dk r�|g|dd�< |�|� | �rj| d dk�rj|j
�t� d�� |d j d k�r*|d |dd�< | �rj| d dk�rj|�t
� t | d
d� �\}} |�|� �q*|| fS ) z] domain = dot-atom / domain-literal / obs-domain
obs-domain = atom *("." atom))
Nr z expected domain but found '{}'rL r� zInvalid Domainr z(domain is not a dot-atom (contains CFWS)r� r� )r� r3 r4 r r r* rM rh r9 r7 r r> rD r� )r r� r; r6 r r r �
get_domain= sD �
�
rN c C s| t � }t| �\}} |�|� | r,| d dkrF|j�t�d�� || fS |�tdd�� t| dd� �\}} |�|� || fS )z( addr-spec = local-part "@" domain
r r� z#addr-spec local part with no domain�address-at-symbolr� N)r� rE rh r r r� r rN )r r� r6 r r r �
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rP c C s� t � }| rj| d dks"| d tkrj| d tkrFt| �\}} |�|� q| d dkr|�t� | dd� } q| rz| d dkr�t�d�| ���|�t� t | dd� �\}} |�|� | �r>| d dk�r>|�t� | dd� } | s�q>| d tk�rt| �\}} |�|� | d dkr�|�t� t | dd� �\}} |�|� q�| �sNt�d��| d dk�rlt�d �| ���|�t
dd
�� || dd� fS ) z� obs-route = obs-domain-list ":"
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Returns an obs-route token with the appropriate sub-tokens (that is,
there is no obs-domain-list in the parse tree).
r r r� Nr� z(expected obs-route domain but found '{}'z%end of header while parsing obs-route�:z4expected ':' marking end of obs-route but found '{}'zend-of-obs-route-marker) r� r3 r4 rh �
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�rT c C s� t � }| d tkr(t| �\}} |�|� | r8| d dkrHt�d�| ���|�tdd�� | dd� } | d dkr�|�tdd�� |j�t� d �� | dd� } || fS zt
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�r t�d �| ���Y nX |�|� t
| �\}} Y nX |�|� | �r^| d dk�r^| dd� } n|j�t� d �� |�tdd�� | �r�| d tk�r�t| �\}} |�|� || fS )
z� angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
obs-angle-addr = [CFWS] "<" obs-route addr-spec ">" [CFWS]
r �<z"expected angle-addr but found '{}'zangle-addr-startr� N�>zangle-addr-endz null addr-spec in angle-addrz*obsolete route specification in angle-addrz.expected addr-spec or obs-route but found '{}'z"missing trailing '>' on angle-addr)
r� r3 r4 rh r r r* r r r� rP rT r> )r Z
angle_addrr6 r r r �get_angle_addr� sT
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rW c C s< t � }t| �\}} |�|dd� � |jdd� |_|| fS )z� display-name = phrase
Because this is simply a name-rule, we don't return a display-name
token containing a phrase, but rather a display-name token with
the content of the phrase.
N)r� r? r4 r )r r~ r6 r r r �get_display_name� s
rX c C s� t � }d}| d tkr6t| �\}} | s6t�d�|���| d dkr�| d tkr^t�d�| ���t| �\}} | s~t�d�|���|dk r�|g|d dd�< d}|�|� t | �\}} |dk r�|g|dd�< |�|� || fS )z, name-addr = [display-name] angle-addr
Nr z!expected name-addr but found '{}'rU )
r� r3 r4 r r r* r= rX rh rW )r Z name_addrr; r6 r r r �
get_name_addr� s6 � � �
rY c C s� t � }zt| �\}} W nN tjk
rd zt| �\}} W n& tjk
r^ t�d�| ���Y nX Y nX tdd� |jD ��r�d|_|� |� || fS )z& mailbox = name-addr / addr-spec
z expected mailbox but found '{}'c s s | ]}t |tj�V qd S r )r� r r� r r r r r# s �z get_mailbox.<locals>.<genexpr>r� )
r� rY r r rP r* �anyr- rD rh )r r� r6 r r r � get_mailbox� s ��
r[ c C sd t � }| r\| d |kr\| d tkrD|�t| d d�� | dd� } qt| �\}} |�|� q|| fS )z� Read everything up to one of the chars in endchars.
This is outside the formal grammar. The InvalidMailbox TokenList that is
returned acts like a Mailbox, but the data attributes are None.
r rF r� N)r� r= rh r r? )r r Zinvalid_mailboxr6 r r r �get_invalid_mailbox s � r\ c C s� t � }| �r�| d dk�r�z t| �\}} |�|� W �n tjk
�r< d}| d tkr�t| �\}} | rv| d dkr�|�|� |j�t�d�� n@t | d�\}} |dk r�|g|dd�< |�|� |j�t�
d�� nb| d dkr�|j�t�d�� nBt | d�\}} |dk �r |g|dd�< |�|� |j�t�
d�� Y nX | �r�| d dk�r�|d }d |_ t | d�\}} |� |� |j�t�
d�� | r| d dkr|�t
� | d
d� } q|| fS ) aJ mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
obs-mbox-list = *([CFWS] ",") mailbox *("," [mailbox / CFWS])
For this routine we go outside the formal grammar in order to improve error
handling. We recognize the end of the mailbox list only at the end of the
value or at a ';' (the group terminator). This is so that we can turn
invalid mailboxes into InvalidMailbox tokens and continue parsing any
remaining valid mailboxes. We also allow all mailbox entries to be null,
and this condition is handled appropriately at a higher level.
r �;Nz,;z empty element in mailbox-listz invalid mailbox in mailbox-listr r� r� r� )r� r[ rh r r r3 r4 r r> r\ r� rD r4 rR )r Z mailbox_listr6 r; r� r r r �get_mailbox_list sX
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r^ c C s t � }| s$|j�t�d�� || fS d}| r�| d tkr�t| �\}} | sl|j�t�d�� |�|� || fS | d dkr�|�|� || fS t| �\}} t|j �dkr�|dk r�|�|� |�
|� |j�t� d�� || fS |dk r�|g|dd�< |�|� || fS )zg group-list = mailbox-list / CFWS / obs-group-list
obs-group-list = 1*([CFWS] ",") [CFWS]
z end of header before group-listNr zend of header in group-listr] z group-list with empty entries) r� r rh r r� r3 r4 r^ r� rz r4 r> )r Z
group_listr; r6 r r r �get_group_listW s>
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r_ c C s t � }t| �\}} | r"| d dkr2t�d�| ���|�|� |�tdd�� | dd� } | r�| d dkr�|�tdd�� || dd� fS t| �\}} |�|� | s�|j�t� d �� n | d dkr�t�d
�| ���|�tdd�� | dd� } | �r| d t
k�rt | �\}} |�|� || fS ) z7 group = display-name ":" [group-list] ";" [CFWS]
r rQ z8expected ':' at end of group display name but found '{}'z group-display-name-terminatorr� Nr] zgroup-terminatorzend of header in groupz)expected ';' at end of group but found {}) r� rX r r r* rh r r_ r r� r3 r4 )r r| r6 r r r � get_group| s8 �
� �
r` c C sx t � }zt| �\}} W nN tjk
rd zt| �\}} W n& tjk
r^ t�d�| ���Y nX Y nX |�|� || fS )a� address = mailbox / group
Note that counter-intuitively, an address can be either a single address or
a list of addresses (a group). This is why the returned Address object has
a 'mailboxes' attribute which treats a single address as a list of length
one. When you need to differentiate between to two cases, extract the single
element, which is either a mailbox or a group token.
z expected address but found '{}')r{ r` r r r[ r* rh )r rr r6 r r r � get_address� s �
ra c
C s� t � }| �r�z t| �\}} |�|� W �n tjk
�rH } z�d}| d tkr�t| �\}} | rj| d dkr�|�|� |j�t�d�� nFt | d�\}} |dk r�|g|dd�< |�t
|g�� |j�t� d�� nh| d dkr�|j�t�d�� nHt | d�\}} |dk �r|g|dd�< |�t
|g�� |j�t� d�� W 5 d}~X Y nX | �r�| d dk�r�|d d }d|_ t | d�\}} |�
|� |j�t� d�� | r|�tdd �� | d
d� } q|| fS ) a� address_list = (address *("," address)) / obs-addr-list
obs-addr-list = *([CFWS] ",") address *("," [address / CFWS])
We depart from the formal grammar here by continuing to parse until the end
of the input, assuming the input to be entirely composed of an
address-list. This is always true in email parsing, and allows us
to skip invalid addresses to parse additional valid ones.
Nr r z"address-list entry with no contentz invalid address in address-listz empty element in address-listr� r� r r� )rq ra rh r r r3 r4 r r> r\ r{ r� rD r4 r )r Z address_listr6 �errr; r� r r r �get_address_list� sX
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�rc c C s� t � }| st�d�| ���| d dkr6t�d�| ���|�tdd�� | dd� } t| �\}} |�|� | rx| d dkr�t�d �| ���|�tdd
�� || dd� fS ) z& no-fold-literal = "[" *dtext "]"
z'expected no-fold-literal but found '{}'r rL z;expected '[' at the start of no-fold-literal but found '{}'zno-fold-literal-startr� NrH z9expected ']' at the end of no-fold-literal but found '{}'zno-fold-literal-end)r� r r r* rh r rG )r Zno_fold_literalr6 r r r �get_no_fold_literal� s. � ��
��rd c C s� t � }| r,| d tkr,t| �\}} |�|� | r<| d dkrLt�d�| ���|�tdd�� | dd� } zt| �\}} W n` tjk
r� z"t | �\}} |j
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r� t�d�| ���Y nX Y nX |�|� | r�| d d k�r@|j
�t� d
�� | �r8| d d k�r8|�td d �� | dd� } || fS |�td d
�� | dd� } zt| �\}} W n� tjk
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�r� t�d�| ���Y nX W 5 d}~X Y nX Y nX |�|� | �r6| d d k�r6| dd� } n|j
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id-left = dot-atom-text / obs-id-left
id-right = dot-atom-text / no-fold-literal / obs-id-right
no-fold-literal = "[" *dtext "]"
r rU z expected msg-id but found '{}'z msg-id-startr� Nzobsolete id-left in msg-idz4expected dot-atom-text or obs-id-left but found '{}'r� zmsg-id with no id-rightrV z
msg-id-endrO zobsolete id-right in msg-idzFexpected dot-atom-text, no-fold-literal or obs-id-right but found '{}'z missing trailing '>' on msg-id)r� r3 r4 rh r r r* r r8 rB r r> r� rd rN )r Zmsg_idr6 �er r r �
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rl } z,t| �}t|�}|j�t�d� |��� W 5 d}~X Y n X | r�|j�t�d� | ��� |S )z2message-id = "Message-ID:" msg-id CRLF
zInvalid msg-id: {!r}NzUnexpected {!r})
r� rf rh r r r( r� r r� r* )r Z
message_idr6 Zexr r r �parse_message_idI s �
�rg c C s� t � }| s |j�t�d�� |S | d tkrXt| �\}} |�|� | sX|j�t�d�� d}| r�| d dkr�| d tkr�|| d 7 }| dd� } q\|�� s�|j�t�d� |��� |�t
|d �� nt |�|_ |�t
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dd �� | dd� } | �r�| d tk�r�t| �\}} |�|� | �s�|j dk �r�|j�t�d �� |S d}| �r�| d tk�r�|| d 7 }| dd� } �q�|�� �s*|j�t�d
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| d �� |S )zE mime-version = [CFWS] 1*digit [CFWS] "." [CFWS] 1*digit [CFWS]
z%Missing MIME version number (eg: 1.0)r z0Expected MIME version number but found only CFWSr r r� Nz1Expected MIME major version number but found {!r}r
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�rl c C sd t � }| r\| d dkr\| d tkrD|�t| d d�� | dd� } qt| �\}} |�|� q|| fS )z� Read everything up to the next ';'.
This is outside the formal grammar. The InvalidParameter TokenList that is
returned acts like a Parameter, but the data attributes are None.
r r] rF r� N)r� r= rh r r? )r Zinvalid_parameterr6 r r r �get_invalid_parameter� s � rm c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )a8 ttext = <matches _ttext_matcher>
We allow any non-TOKEN_ENDS in ttext, but add defects to the token's
defects list if we find non-ttext characters. We also register defects for
*any* non-printables even though the RFC doesn't exclude all of them,
because we follow the spirit of RFC 5322.
z expected ttext but found '{}'N�ttext)�_non_token_end_matcherr r r* r| r� r r )r r/ rn r r r � get_ttext� s �
rp c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )z�token = [CFWS] 1*ttext [CFWS]
The RFC equivalent of ttext is any US-ASCII chars except space, ctls, or
tspecials. We also exclude tabs even though the RFC doesn't.
The RFC implies the CFWS but is not explicit about it in the BNF.
r � expected token but found '{}') r\ r3 r4 rh �
TOKEN_ENDSr r r* rp )r Zmtokenr6 r r r � get_token� s
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rs c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )aQ attrtext = 1*(any non-ATTRIBUTE_ENDS character)
We allow any non-ATTRIBUTE_ENDS in attrtext, but add defects to the
token's defects list if we find non-attrtext characters. We also register
defects for *any* non-printables even though the RFC doesn't exclude all of
them, because we follow the spirit of RFC 5322.
z expected attrtext but found {!r}Nr� )�_non_attribute_end_matcherr r r* r| r� r r �r r/ r� r r r � get_attrtext� s �
rv c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )aH [CFWS] 1*attrtext [CFWS]
This version of the BNF makes the CFWS explicit, and as usual we use a
value terminal for the actual run of characters. The RFC equivalent of
attrtext is the token characters, with the subtraction of '*', "'", and '%'.
We include tab in the excluded set just as we do for token.
r rq ) r� r3 r4 rh �ATTRIBUTE_ENDSr r r* rv �r r� r6 r r r �
get_attribute� s
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ry c C sN t | �}|s t�d�| ���|�� }| t|�d� } t|d�}t|� || fS )z�attrtext = 1*(any non-ATTRIBUTE_ENDS character plus '%')
This is a special parsing routine so that we get a value that
includes % escapes as a single string (which we decode as a single
string later).
z)expected extended attrtext but found {!r}N�extended-attrtext)�#_non_extended_attribute_end_matcherr r r* r| r� r r ru r r r �get_extended_attrtext s �
r| c C s� t � }| r,| d tkr,t| �\}} |�|� | rL| d tkrLt�d�| ���t| �\}} |�|� | r�| d tkr�t| �\}} |�|� || fS )z� [CFWS] 1*extended_attrtext [CFWS]
This is like the non-extended version except we allow % characters, so that
we can pick up an encoded value as a single string.
r rq ) r� r3 r4 rh �EXTENDED_ATTRIBUTE_ENDSr r r* r| rx r r r �get_extended_attribute! s
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r~ c C s� t � }| r| d dkr&t�d�| ���|�tdd�� | dd� } | rR| d �� sbt�d�| ���d}| r�| d �� r�|| d 7 }| dd� } qf|d d kr�|d kr�|j�t�d
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|�t|d �� || fS ) a6 '*' digits
The formal BNF is more complicated because leading 0s are not allowed. We
check for that and add a defect. We also assume no CFWS is allowed between
the '*' and the digits, though the RFC is not crystal clear on that.
The caller should already have dealt with leading CFWS.
r �*z Expected section but found {}zsection-markerr� Nz$Expected section number but found {}r �0z'section number has an invalid leading 0rh ) r� r r r* rh r rj r ZInvalidHeaderErrorrk r� )r r� rh r r r � get_section7 s, � �
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r� c C s� t � }| st�d��d}| d tkr0t| �\}} | sDt�d�|���| d dkr^t| �\}} n t| �\}} |dk r�|g|dd�< |�|� || fS )z quoted-string / attribute
z&Expected value but found end of stringNr z Expected value but found only {}r
) r� r r r3 r4 r* r5 r~ rh )r �vr; r6 r r r � get_valueU s"
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d�}| dd � } n t| �\}} | �|� �q�| }n t| �\}} |�|� |d k �r�|} || fS )aY attribute [section] ["*"] [CFWS] "=" value
The CFWS is implied by the RFC but not made explicit in the BNF. This
simplified form of the BNF from the RFC is made to conform with the RFC BNF
through some extra checks. We do it this way because it makes both error
recovery and working with the resulting parse tree easier.
r r] z)Parameter contains name ({}) but no valuer TzIncomplete parameterzextended-parameter-markerr� N�=z Parameter not followed by '='�parameter-separatorr
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d� } q|S ) a! parameter *( ";" parameter )
That BNF is meant to indicate this routine should only be called after
finding and handling the leading ';'. There is no corresponding rule in
the formal RFC grammar, but it is more convenient for us for the set of
parameters to be treated as its own TokenList.
This is 'parse' routine because it consumes the remaining value, but it
would never be called to parse a full header. Instead it is called to
parse everything after the non-parameter value of a specific MIME header.
Nr r] z parameter entry with no contentzinvalid parameter {!r}r� r� z)parameter with invalid trailing text {!r}r� r� )r� r� rh r r r3 r4 r r� rm r* rD r4 r )r Zmime_parametersr6 rb r; r� r r r �parse_mime_parameters� sJ
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r r] rF r� Nr� )r= rh r r? r� )Z tokenlistr r6 r r r �_find_mime_parameters-
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�� |�t| dd � �� |S )z� maintype "/" subtype *( ";" parameter )
The maintype and substype are tokens. Theoretically they could
be checked against the official IANA list + x-token, but we
don't do that.
Fz"Missing content type specificationz(Expected content maintype but found {!r}r r� zInvalid content typezcontent-type-separatorr� Nz'Expected content subtype but found {!r}r] z<Only parameters are valid after content type, but found {!r}r� )r� r rh r ri rs r r� r* r� r r� �lowerr� r r� r� )r ZctypeZrecoverr6 r r r �parse_content_type_header=
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header's quoting as is. Otherwise, the parameters will be quoted (the
default).
An alternative header can be specified in the header argument. When
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AddrlistClassa Address parser class by Ben Escoto.
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Use email.utils.AddressList instead.
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Fre rf r r r rc � s z AddrlistClass.getdomainliteralNc C sd dg}|dkr| j }| jt| j�k rZ| j| j |kr8qZn|�| j| j � | jd7 _qt�|�S )a Parse an RFC 2822 atom.
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raise_on_defect -- If true, then defects should be raised as errors.
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cte_type -- Type of allowed content transfer encodings
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max_line_length -- maximum length of lines, excluding 'linesep',
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HTTP (HyperText Transfer Protocol) is an extensible protocol on
top of a reliable stream transport (e.g. TCP/IP). The protocol
recognizes three parts to a request:
1. One line identifying the request type and path
2. An optional set of RFC-822-style headers
3. An optional data part
The headers and data are separated by a blank line.
The first line of the request has the form
<command> <path> <version>
where <command> is a (case-sensitive) keyword such as GET or POST,
<path> is a string containing path information for the request,
and <version> should be the string "HTTP/1.0" or "HTTP/1.1".
<path> is encoded using the URL encoding scheme (using %xx to signify
the ASCII character with hex code xx).
The specification specifies that lines are separated by CRLF but
for compatibility with the widest range of clients recommends
servers also handle LF. Similarly, whitespace in the request line
is treated sensibly (allowing multiple spaces between components
and allowing trailing whitespace).
Similarly, for output, lines ought to be separated by CRLF pairs
but most clients grok LF characters just fine.
If the first line of the request has the form
<command> <path>
(i.e. <version> is left out) then this is assumed to be an HTTP
0.9 request; this form has no optional headers and data part and
the reply consists of just the data.
The reply form of the HTTP 1.x protocol again has three parts:
1. One line giving the response code
2. An optional set of RFC-822-style headers
3. The data
Again, the headers and data are separated by a blank line.
The response code line has the form
<version> <responsecode> <responsestring>
where <version> is the protocol version ("HTTP/1.0" or "HTTP/1.1"),
<responsecode> is a 3-digit response code indicating success or
failure of the request, and <responsestring> is an optional
human-readable string explaining what the response code means.
This server parses the request and the headers, and then calls a
function specific to the request type (<command>). Specifically,
a request SPAM will be handled by a method do_SPAM(). If no
such method exists the server sends an error response to the
client. If it exists, it is called with no arguments:
do_SPAM()
Note that the request name is case sensitive (i.e. SPAM and spam
are different requests).
The various request details are stored in instance variables:
- client_address is the client IP address in the form (host,
port);
- command, path and version are the broken-down request line;
- headers is an instance of email.message.Message (or a derived
class) containing the header information;
- rfile is a file object open for reading positioned at the
start of the optional input data part;
- wfile is a file object open for writing.
IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING!
The first thing to be written must be the response line. Then
follow 0 or more header lines, then a blank line, and then the
actual data (if any). The meaning of the header lines depends on
the command executed by the server; in most cases, when data is
returned, there should be at least one header line of the form
Content-type: <type>/<subtype>
where <type> and <subtype> should be registered MIME types,
e.g. "text/html" or "text/plain".
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Class diagram (note that BSDDBCookieJar and the MSIE* classes are not
distributed with the Python standard library, but are available from
http://wwwsearch.sf.net/):
CookieJar____
/ \ \
FileCookieJar \ \
/ | \ \ \
MozillaCookieJar | LWPCookieJar \ \
| | \
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| / | | \
| / MSIEDBCookieJar BSDDBCookieJar
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(?:
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(?:
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)?$c C s� t �| �}|rl|�� }t�|d �� �d }t|d �|t|d �t|d �t|d �t|d �f}t|�S | � � } t
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a� Returns time in seconds since epoch of time represented by a string.
Return value is an integer.
None is returned if the format of str is unrecognized, the time is outside
the representable range, or the timezone string is not recognized. If the
string contains no timezone, UTC is assumed.
The timezone in the string may be numerical (like "-0800" or "+0100") or a
string timezone (like "UTC", "GMT", "BST" or "EST"). Currently, only the
timezone strings equivalent to UTC (zero offset) are known to the function.
The function loosely parses the following formats:
Wed, 09 Feb 1994 22:23:32 GMT -- HTTP format
Tuesday, 08-Feb-94 14:15:29 GMT -- old rfc850 HTTP format
Tuesday, 08-Feb-1994 14:15:29 GMT -- broken rfc850 HTTP format
09 Feb 1994 22:23:32 GMT -- HTTP format (no weekday)
08-Feb-94 14:15:29 GMT -- rfc850 format (no weekday)
08-Feb-1994 14:15:29 GMT -- broken rfc850 format (no weekday)
The parser ignores leading and trailing whitespace. The time may be
absent.
If the year is given with only 2 digits, the function will select the
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As for http2time, but parses the ISO 8601 formats:
1994-02-03 14:15:29 -0100 -- ISO 8601 format
1994-02-03 14:15:29 -- zone is optional
1994-02-03 -- only date
1994-02-03T14:15:29 -- Use T as separator
19940203T141529Z -- ISO 8601 compact format
19940203 -- only date
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C s0 t | t�rt�g }| D �]}|}g }|�r t�|�}|r�t|�}|�d�}t�|�}|rxt|�}|�d�}t� d|�}n.t
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� dd� }|r�|� |� g }q$t�dd|�\}} | dk�std|||f ��|}q$|r|� |� q|S ) am Parse header values into a list of lists containing key,value pairs.
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If the header_values passed as argument contains multiple values, then they
are treated as if they were a single value separated by comma ",".
This means that this function is useful for parsing header fields that
follow this syntax (BNF as from the HTTP/1.1 specification, but we relax
the requirement for tokens).
headers = #header
header = (token | parameter) *( [";"] (token | parameter))
token = 1*<any CHAR except CTLs or separators>
separators = "(" | ")" | "<" | ">" | "@"
| "," | ";" | ":" | "\" | <">
| "/" | "[" | "]" | "?" | "="
| "{" | "}" | SP | HT
quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
qdtext = <any TEXT except <">>
quoted-pair = "\" CHAR
parameter = attribute "=" value
attribute = token
value = token | quoted-string
Each header is represented by a list of key/value pairs. The value for a
simple token (not part of a parameter) is None. Syntactically incorrect
headers will not necessarily be parsed as you would want.
This is easier to describe with some examples:
>>> split_header_words(['foo="bar"; port="80,81"; discard, bar=baz'])
[[('foo', 'bar'), ('port', '80,81'), ('discard', None)], [('bar', 'baz')]]
>>> split_header_words(['text/html; charset="iso-8859-1"'])
[[('text/html', None), ('charset', 'iso-8859-1')]]
>>> split_header_words([r'Basic realm="\"foo\bar\""'])
[[('Basic', None), ('realm', '"foobar"')]]
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value. Attribute values are quoted if needed.
>>> join_header_words([[("text/plain", None), ("charset", "iso-8859-1")]])
'text/plain; charset="iso-8859-1"'
>>> join_header_words([[("text/plain", None)], [("charset", "iso-8859-1")]])
'text/plain, charset="iso-8859-1"'
Nz^\w+$�\\\1z"%s"�%s=%s�; �, )rw r@ �HEADER_JOIN_ESCAPE_REr^ ru �join)Zlists�headersrz �attr�k�vr r r �join_header_words� s r� c C s0 | � d�r| dd � } | �d�r,| d d� } | S )N�"r ���)rv �endswith�r` r r r � strip_quotes� s
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XXX This may not make the best possible effort to parse all the crap
that Netscape Cookie headers contain. Ronald Tschalar's HTTPClient
parser is probably better, so could do worse than following that if
this ever gives any trouble.
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A and B may be host domain names or IP addresses.
RFC 2965, section 1:
Host names can be specified either as an IP address or a HDN string.
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be case-insensitive.) Host A's name domain-matches host B's if
* their host name strings string-compare equal; or
* A is a HDN string and has the form NB, where N is a non-empty
name string, B has the form .B', and B' is a HDN string. (So,
x.y.com domain-matches .Y.com but not Y.com.)
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then the reach of H is .B.
* Otherwise, the reach of H is H.
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'acme.com'
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objects -- it deals with cookie parsing, supplying defaults, and
normalising to the representation used in this class. CookiePolicy is
responsible for checking them to see whether they should be accepted from
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zCookieJar.set_cookiec C sb t d|�� � | j�� z8| �||�D ]&}| j�||�r&t d|� | �|� q&W 5 | j�� X dS )zAExtract cookies from response, where allowable given the request.zextract_cookies: %sz setting cookie: %sN) r r r? rR rS rh r< r� ri )r� rg r� r� r r r �extract_cookies� s
zCookieJar.extract_cookiesc C st |dk r2|dks|dkr t d��| j| | |= n>|dk rX|dkrJt d��| j| |= n|dk rj| j|= ni | _dS )a� Clear some cookies.
Invoking this method without arguments will clear all cookies. If
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removed. If given two arguments, cookies belonging to the specified
path within that domain are removed. If given three arguments, then
the cookie with the specified name, path and domain is removed.
Raises KeyError if no matching cookie exists.
Nz8domain and path must be given to remove a cookie by namez.domain must be given to remove cookies by path)rL r@ )r� r� r� r{ r r r r] � s ��
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You probably don't need to call this method: expired cookies are never
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.save() method won't save expired cookies anyway (unless you ask
otherwise by passing a true ignore_expires argument).
N) r? rR rS rM r� r] r� r� r{ )r� r� r� r r r rT � s
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t | j�S r� )r6 r@ r r r r �__iter__� s zCookieJar.__iter__c C s d}| D ] }|d }q|S )z#Return number of contained cookies.r r r )r� r� r� r r r �__len__� s
zCookieJar.__len__c C s2 g }| D ]}|� t|�� qd| jjd�|�f S �Nz<%s[%s]>r� )ru r� r� r� r� �r� �rr� r r r r� � s zCookieJar.__repr__c C s2 g }| D ]}|� t|�� qd| jjd�|�f S rp )ru rn r� r� r� rq r r r r� � s zCookieJar.__str__)N)NNN)"r� r� r� r� rw �compilerM rN Zstrict_domain_reZ domain_reZdots_re�ASCII�magic_rer� rC rE rG rP rQ r[ r` ra rb rh rj ri rl r] rm rT rn ro r� r� r r r r r � s8
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zFileCookieJar.loadc C s� |dkr"| j dk r| j }ntt��| j�� zFt�| j�}i | _z| � |||� W n t
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rn || _� Y nX W 5 | j�� X dS )z�Clear all cookies and reload cookies from a saved file.
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�c C s | j | jfd| jfd| jfg}| jdk r8|�d| jf� | jrH|�d� | jrX|�d� | jrh|�d� | j rx|�d� | j
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t| j�f� t|g�S )z�Return string representation of Cookie in the LWP cookie file format.
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The LWPCookieJar saves a sequence of "Set-Cookie3" lines.
"Set-Cookie3" is the format used by the libwww-perl library, not known
to be compatible with any browser, but which is easy to read and
doesn't lose information about RFC 2965 cookies.
Additional methods
as_lwp_str(ignore_discard=True, ignore_expired=True)
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�r* t� td|| f ��Y nX d S )Nz5%r does not look like a Set-Cookie3 (LWP) format filez Set-Cookie3:)r� r� r� r� r� )r� r� r� r� r� r� rU rW r Fr Tr� r� r� r� r� r� r� r� r� r� r� r� rU z&invalid Set-Cookie3 format file %r: %r)�readlineru r@ r rM rv r r� r} rK r� re r r� r� ri r� re r )r� r rx rz r{ �magicr r� �headerrX rY �line�datar{ r| rZ r� r� r� r� r� r� r� r� r� rk r r r r i s� �
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WARNING: you may want to backup your browser's cookies file if you use
this class to save cookies. I *think* it works, but there have been
bugs in the past!
This class differs from CookieJar only in the format it uses to save and
load cookies to and from a file. This class uses the Mozilla/Netscape
`cookies.txt' format. lynx uses this file format, too.
Don't expect cookies saved while the browser is running to be noticed by
the browser (in fact, Mozilla on unix will overwrite your saved cookies if
you change them on disk while it's running; on Windows, you probably can't
save at all while the browser is running).
Note that the Mozilla/Netscape format will downgrade RFC2965 cookies to
Netscape cookies on saving.
In particular, the cookie version and port number information is lost,
together with information about whether or not Path, Port and Discard were
specified by the Set-Cookie2 (or Set-Cookie) header, and whether or not the
domain as set in the HTTP header started with a dot (yes, I'm aware some
domains in Netscape files start with a dot and some don't -- trust me, you
really don't want to know any more about this).
Note that though Mozilla and Netscape use the same format, they use
slightly different headers. The class saves cookies using the Netscape
header by default (Mozilla can cope with that).
z #( Netscape)? HTTP Cookie Filezr# Netscape HTTP Cookie File
# http://curl.haxx.se/rfc/cookie_spec.html
# This is a generated file! Do not edit.
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HTTP/1.1 client library
<intro stuff goes here>
<other stuff, too>
HTTPConnection goes through a number of "states", which define when a client
may legally make another request or fetch the response for a particular
request. This diagram details these state transitions:
(null)
|
| HTTPConnection()
v
Idle
|
| putrequest()
v
Request-started
|
| ( putheader() )* endheaders()
v
Request-sent
|\_____________________________
| | getresponse() raises
| response = getresponse() | ConnectionError
v v
Unread-response Idle
[Response-headers-read]
|\____________________
| |
| response.read() | putrequest()
v v
Idle Req-started-unread-response
______/|
/ |
response.read() | | ( putheader() )* endheaders()
v v
Request-started Req-sent-unread-response
|
| response.read()
v
Request-sent
This diagram presents the following rules:
-- a second request may not be started until {response-headers-read}
-- a response [object] cannot be retrieved until {request-sent}
-- there is no differentiation between an unread response body and a
partially read response body
Note: this enforcement is applied by the HTTPConnection class. The
HTTPResponse class does not enforce this state machine, which
implies sophisticated clients may accelerate the request/response
pipeline. Caution should be taken, though: accelerating the states
beyond the above pattern may imply knowledge of the server's
connection-close behavior for certain requests. For example, it
is impossible to tell whether the server will close the connection
UNTIL the response headers have been read; this means that further
requests cannot be placed into the pipeline until it is known that
the server will NOT be closing the connection.
Logical State __state __response
------------- ------- ----------
Idle _CS_IDLE None
Request-started _CS_REQ_STARTED None
Request-sent _CS_REQ_SENT None
Unread-response _CS_IDLE <response_class>
Req-started-unread-response _CS_REQ_STARTED <response_class>
Req-sent-unread-response _CS_REQ_SENT <response_class>
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S )wa� HTTP cookie handling for web clients.
This module has (now fairly distant) origins in Gisle Aas' Perl module
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Docstrings, comments and debug strings in this code refer to the
attributes of the HTTP cookie system as cookie-attributes, to distinguish
them clearly from Python attributes.
Class diagram (note that BSDDBCookieJar and the MSIE* classes are not
distributed with the Python standard library, but are available from
http://wwwsearch.sf.net/):
CookieJar____
/ \ \
FileCookieJar \ \
/ | \ \ \
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| | \
| ---MSIEBase | \
| / | | \
| / MSIEDBCookieJar BSDDBCookieJar
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��
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If the function is called without an argument, it will use the current
time.
The format of the returned string is like "YYYY-MM-DD hh:mm:ssZ",
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1994-11-24 08:49:37Z
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|j f S )z�Return a string representing time in seconds since epoch, t.
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(\d\d?) # day
(?:\s+|[-\/])
(\w+) # month
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(\d+) # year
(?:
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(?::(\d\d))? # optional seconds
)? # optional clock
\s*
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([-+]?\d{2,4}|(?![APap][Mm]\b)[A-Za-z]+) # timezone
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a� Returns time in seconds since epoch of time represented by a string.
Return value is an integer.
None is returned if the format of str is unrecognized, the time is outside
the representable range, or the timezone string is not recognized. If the
string contains no timezone, UTC is assumed.
The timezone in the string may be numerical (like "-0800" or "+0100") or a
string timezone (like "UTC", "GMT", "BST" or "EST"). Currently, only the
timezone strings equivalent to UTC (zero offset) are known to the function.
The function loosely parses the following formats:
Wed, 09 Feb 1994 22:23:32 GMT -- HTTP format
Tuesday, 08-Feb-94 14:15:29 GMT -- old rfc850 HTTP format
Tuesday, 08-Feb-1994 14:15:29 GMT -- broken rfc850 HTTP format
09 Feb 1994 22:23:32 GMT -- HTTP format (no weekday)
08-Feb-94 14:15:29 GMT -- rfc850 format (no weekday)
08-Feb-1994 14:15:29 GMT -- broken rfc850 format (no weekday)
The parser ignores leading and trailing whitespace. The time may be
absent.
If the year is given with only 2 digits, the function will select the
century that makes the year closest to the current date.
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(\d{4}) # year
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As for http2time, but parses the ISO 8601 formats:
1994-02-03 14:15:29 -0100 -- ISO 8601 format
1994-02-03 14:15:29 -- zone is optional
1994-02-03 -- only date
1994-02-03T14:15:29 -- Use T as separator
19940203T141529Z -- ISO 8601 compact format
19940203 -- only date
NrX )r\ � ISO_DATE_REr@ rZ rT )
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C s g }| D ]�}|}g }|r�t �|�}|r�t|�}|�d�}t�|�}|rft|�}|�d�}t�d|�}n.t�|�}|r�t|�}|�d�}|�� }nd}|� ||f� q|�
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dd|�\}} |}q|r|� |� q|S )am Parse header values into a list of lists containing key,value pairs.
The function knows how to deal with ",", ";" and "=" as well as quoted
values after "=". A list of space separated tokens are parsed as if they
were separated by ";".
If the header_values passed as argument contains multiple values, then they
are treated as if they were a single value separated by comma ",".
This means that this function is useful for parsing header fields that
follow this syntax (BNF as from the HTTP/1.1 specification, but we relax
the requirement for tokens).
headers = #header
header = (token | parameter) *( [";"] (token | parameter))
token = 1*<any CHAR except CTLs or separators>
separators = "(" | ")" | "<" | ">" | "@"
| "," | ";" | ":" | "\" | <">
| "/" | "[" | "]" | "?" | "="
| "{" | "}" | SP | HT
quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
qdtext = <any TEXT except <">>
quoted-pair = "\" CHAR
parameter = attribute "=" value
attribute = token
value = token | quoted-string
Each header is represented by a list of key/value pairs. The value for a
simple token (not part of a parameter) is None. Syntactically incorrect
headers will not necessarily be parsed as you would want.
This is easier to describe with some examples:
>>> split_header_words(['foo="bar"; port="80,81"; discard, bar=baz'])
[[('foo', 'bar'), ('port', '80,81'), ('discard', None)], [('bar', 'baz')]]
>>> split_header_words(['text/html; charset="iso-8859-1"'])
[[('text/html', None), ('charset', 'iso-8859-1')]]
>>> split_header_words([r'Basic realm="\"foo\bar\""'])
[[('Basic', None), ('realm', '"foobar"')]]
r z\1N�,z^[=\s;]*rW )�HEADER_TOKEN_REr@ rk rB �HEADER_QUOTED_VALUE_RE�HEADER_ESCAPE_REr^ �HEADER_VALUE_RE�rstrip�appendr\ �
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Takes a list of lists of (key, value) pairs and produces a single header
value. Attribute values are quoted if needed.
>>> join_header_words([[("text/plain", None), ("charset", "iso-8859-1")]])
'text/plain; charset="iso-8859-1"'
>>> join_header_words([[("text/plain", None)], [("charset", "iso-8859-1")]])
'text/plain, charset="iso-8859-1"'
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XXX This may not make the best possible effort to parse all the crap
that Netscape Cookie headers contain. Ronald Tschalar's HTTPClient
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this ever gives any trouble.
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r� c C sl | � � } |� � }| |kr dS t| �s(dS | �|�}|dksB|dkrFdS |�d�sTdS t|dd� �shdS dS )a� Return True if domain A domain-matches domain B, according to RFC 2965.
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RFC 2965, section 1:
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be case-insensitive.) Host A's name domain-matches host B's if
* their host name strings string-compare equal; or
* A is a HDN string and has the form NB, where N is a non-empty
name string, B has the form .B', and B' is a HDN string. (So,
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then the reach of H is .B.
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>>> reach("www.acme.com")
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'acme.com'
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'.local'
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objects -- it deals with cookie parsing, supplying defaults, and
normalising to the representation used in this class. CookiePolicy is
responsible for checking them to see whether they should be accepted from
and returned to the server.
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| f� q|S )a Return list of tuples containing normalised cookie information.
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Additional methods
as_lwp_str(ignore_discard=True, ignore_expired=True)
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HTTPConnection goes through a number of "states", which define when a client
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request. This diagram details these state transitions:
(null)
|
| HTTPConnection()
v
Idle
|
| putrequest()
v
Request-started
|
| ( putheader() )* endheaders()
v
Request-sent
|\_____________________________
| | getresponse() raises
| response = getresponse() | ConnectionError
v v
Unread-response Idle
[Response-headers-read]
|\____________________
| |
| response.read() | putrequest()
v v
Idle Req-started-unread-response
______/|
/ |
response.read() | | ( putheader() )* endheaders()
v v
Request-started Req-sent-unread-response
|
| response.read()
v
Request-sent
This diagram presents the following rules:
-- a second request may not be started until {response-headers-read}
-- a response [object] cannot be retrieved until {request-sent}
-- there is no differentiation between an unread response body and a
partially read response body
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implies sophisticated clients may accelerate the request/response
pipeline. Caution should be taken, though: accelerating the states
beyond the above pattern may imply knowledge of the server's
connection-close behavior for certain requests. For example, it
is impossible to tell whether the server will close the connection
UNTIL the response headers have been read; this means that further
requests cannot be placed into the pipeline until it is known that
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Logical State __state __response
------------- ------- ----------
Idle _CS_IDLE None
Request-started _CS_REQ_STARTED None
Request-sent _CS_REQ_SENT None
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present if (as is now usual) the server passed back a file
length in response to the FTP retrieval request. A
Content-Type header will be present if the MIME type can be
guessed.
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r�| � � n|| _ |W S |� � � Y nX dS )a) Get the response from the server.
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response indicates that the connection should be closed, then
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Here's a sample session to show how to use this module.
At the moment, this is the only documentation.
The Basics
----------
Importing is easy...
>>> from http import cookies
Most of the time you start by creating a cookie.
>>> C = cookies.SimpleCookie()
Once you've created your Cookie, you can add values just as if it were
a dictionary.
>>> C = cookies.SimpleCookie()
>>> C["fig"] = "newton"
>>> C["sugar"] = "wafer"
>>> C.output()
'Set-Cookie: fig=newton\r\nSet-Cookie: sugar=wafer'
Notice that the printable representation of a Cookie is the
appropriate format for a Set-Cookie: header. This is the
default behavior. You can change the header and printed
attributes by using the .output() function
>>> C = cookies.SimpleCookie()
>>> C["rocky"] = "road"
>>> C["rocky"]["path"] = "/cookie"
>>> print(C.output(header="Cookie:"))
Cookie: rocky=road; Path=/cookie
>>> print(C.output(attrs=[], header="Cookie:"))
Cookie: rocky=road
The load() method of a Cookie extracts cookies from a string. In a
CGI script, you would use this method to extract the cookies from the
HTTP_COOKIE environment variable.
>>> C = cookies.SimpleCookie()
>>> C.load("chips=ahoy; vienna=finger")
>>> C.output()
'Set-Cookie: chips=ahoy\r\nSet-Cookie: vienna=finger'
The load() method is darn-tootin smart about identifying cookies
within a string. Escaped quotation marks, nested semicolons, and other
such trickeries do not confuse it.
>>> C = cookies.SimpleCookie()
>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
>>> print(C)
Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"
Each element of the Cookie also supports all of the RFC 2109
Cookie attributes. Here's an example which sets the Path
attribute.
>>> C = cookies.SimpleCookie()
>>> C["oreo"] = "doublestuff"
>>> C["oreo"]["path"] = "/"
>>> print(C)
Set-Cookie: oreo=doublestuff; Path=/
Each dictionary element has a 'value' attribute, which gives you
back the value associated with the key.
>>> C = cookies.SimpleCookie()
>>> C["twix"] = "none for you"
>>> C["twix"].value
'none for you'
The SimpleCookie expects that all values should be standard strings.
Just to be sure, SimpleCookie invokes the str() builtin to convert
the value to a string, when the values are set dictionary-style.
>>> C = cookies.SimpleCookie()
>>> C["number"] = 7
>>> C["string"] = "seven"
>>> C["number"].value
'7'
>>> C["string"].value
'seven'
>>> C.output()
'Set-Cookie: number=7\r\nSet-Cookie: string=seven'
Finis.
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Here's a sample session to show how to use this module.
At the moment, this is the only documentation.
The Basics
----------
Importing is easy...
>>> from http import cookies
Most of the time you start by creating a cookie.
>>> C = cookies.SimpleCookie()
Once you've created your Cookie, you can add values just as if it were
a dictionary.
>>> C = cookies.SimpleCookie()
>>> C["fig"] = "newton"
>>> C["sugar"] = "wafer"
>>> C.output()
'Set-Cookie: fig=newton\r\nSet-Cookie: sugar=wafer'
Notice that the printable representation of a Cookie is the
appropriate format for a Set-Cookie: header. This is the
default behavior. You can change the header and printed
attributes by using the .output() function
>>> C = cookies.SimpleCookie()
>>> C["rocky"] = "road"
>>> C["rocky"]["path"] = "/cookie"
>>> print(C.output(header="Cookie:"))
Cookie: rocky=road; Path=/cookie
>>> print(C.output(attrs=[], header="Cookie:"))
Cookie: rocky=road
The load() method of a Cookie extracts cookies from a string. In a
CGI script, you would use this method to extract the cookies from the
HTTP_COOKIE environment variable.
>>> C = cookies.SimpleCookie()
>>> C.load("chips=ahoy; vienna=finger")
>>> C.output()
'Set-Cookie: chips=ahoy\r\nSet-Cookie: vienna=finger'
The load() method is darn-tootin smart about identifying cookies
within a string. Escaped quotation marks, nested semicolons, and other
such trickeries do not confuse it.
>>> C = cookies.SimpleCookie()
>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
>>> print(C)
Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"
Each element of the Cookie also supports all of the RFC 2109
Cookie attributes. Here's an example which sets the Path
attribute.
>>> C = cookies.SimpleCookie()
>>> C["oreo"] = "doublestuff"
>>> C["oreo"]["path"] = "/"
>>> print(C)
Set-Cookie: oreo=doublestuff; Path=/
Each dictionary element has a 'value' attribute, which gives you
back the value associated with the key.
>>> C = cookies.SimpleCookie()
>>> C["twix"] = "none for you"
>>> C["twix"].value
'none for you'
The SimpleCookie expects that all values should be standard strings.
Just to be sure, SimpleCookie invokes the str() builtin to convert
the value to a string, when the values are set dictionary-style.
>>> C = cookies.SimpleCookie()
>>> C["number"] = 7
>>> C["string"] = "seven"
>>> C["number"].value
'7'
>>> C["string"].value
'seven'
>>> C.output()
'Set-Cookie: number=7\r\nSet-Cookie: string=seven'
Finis.
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Note: BaseHTTPRequestHandler doesn't implement any HTTP request; see
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and CGIHTTPRequestHandler for CGI scripts.
It does, however, optionally implement HTTP/1.1 persistent connections,
as of version 0.3.
Notes on CGIHTTPRequestHandler
------------------------------
This class implements GET and POST requests to cgi-bin scripts.
If the os.fork() function is not present (e.g. on Windows),
subprocess.Popen() is used as a fallback, with slightly altered semantics.
In all cases, the implementation is intentionally naive -- all
requests are executed synchronously.
SECURITY WARNING: DON'T USE THIS CODE UNLESS YOU ARE INSIDE A FIREWALL
-- it may execute arbitrary Python code or external programs.
Note that status code 200 is sent prior to execution of a CGI script, so
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ztext/html;charset=utf-8c @ s e Zd ZdZdd� ZdS )r � c C s4 t j�| � | jdd� \}}t�|�| _|| _dS )z.Override server_bind to store the server name.N� )� socketserver� TCPServer� server_bindZserver_address�socketZgetfqdn� server_name� server_port)�self�host�port� r �#/usr/lib64/python3.8/http/server.pyr
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The following explanation of HTTP serves to guide you through the
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:-).
HTTP (HyperText Transfer Protocol) is an extensible protocol on
top of a reliable stream transport (e.g. TCP/IP). The protocol
recognizes three parts to a request:
1. One line identifying the request type and path
2. An optional set of RFC-822-style headers
3. An optional data part
The headers and data are separated by a blank line.
The first line of the request has the form
<command> <path> <version>
where <command> is a (case-sensitive) keyword such as GET or POST,
<path> is a string containing path information for the request,
and <version> should be the string "HTTP/1.0" or "HTTP/1.1".
<path> is encoded using the URL encoding scheme (using %xx to signify
the ASCII character with hex code xx).
The specification specifies that lines are separated by CRLF but
for compatibility with the widest range of clients recommends
servers also handle LF. Similarly, whitespace in the request line
is treated sensibly (allowing multiple spaces between components
and allowing trailing whitespace).
Similarly, for output, lines ought to be separated by CRLF pairs
but most clients grok LF characters just fine.
If the first line of the request has the form
<command> <path>
(i.e. <version> is left out) then this is assumed to be an HTTP
0.9 request; this form has no optional headers and data part and
the reply consists of just the data.
The reply form of the HTTP 1.x protocol again has three parts:
1. One line giving the response code
2. An optional set of RFC-822-style headers
3. The data
Again, the headers and data are separated by a blank line.
The response code line has the form
<version> <responsecode> <responsestring>
where <version> is the protocol version ("HTTP/1.0" or "HTTP/1.1"),
<responsecode> is a 3-digit response code indicating success or
failure of the request, and <responsestring> is an optional
human-readable string explaining what the response code means.
This server parses the request and the headers, and then calls a
function specific to the request type (<command>). Specifically,
a request SPAM will be handled by a method do_SPAM(). If no
such method exists the server sends an error response to the
client. If it exists, it is called with no arguments:
do_SPAM()
Note that the request name is case sensitive (i.e. SPAM and spam
are different requests).
The various request details are stored in instance variables:
- client_address is the client IP address in the form (host,
port);
- command, path and version are the broken-down request line;
- headers is an instance of email.message.Message (or a derived
class) containing the header information;
- rfile is a file object open for reading positioned at the
start of the optional input data part;
- wfile is a file object open for writing.
IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING!
The first thing to be written must be the response line. Then
follow 0 or more header lines, then a blank line, and then the
actual data (if any). The meaning of the header lines depends on
the command executed by the server; in most cases, when data is
returned, there should be at least one header line of the form
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where <type> and <subtype> should be registered MIME types,
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dd� Z dS )r z,Abstract server returned by create_server().c C s t �dS )z5Stop serving. This leaves existing connections open.N��NotImplementedErrorr9 r& r& r' �close� s zAbstractServer.closec C s t �dS )z4Get the event loop the Server object is attached to.Nrd r9 r& r& r' �get_loop� s zAbstractServer.get_loopc C s t �dS )z3Return True if the server is accepting connections.Nrd r9 r& r& r' �
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one for IPv4 and another one for IPv6). The host parameter can also be
a sequence (e.g. list) of hosts to bind to.
family can be set to either AF_INET or AF_INET6 to force the
socket to use IPv4 or IPv6. If not set it will be determined
from host (defaults to AF_UNSPEC).
flags is a bitmask for getaddrinfo().
sock can optionally be specified in order to use a preexisting
socket object.
backlog is the maximum number of queued connections passed to
listen() (defaults to 100).
ssl can be set to an SSLContext to enable SSL over the
accepted connections.
reuse_address tells the kernel to reuse a local socket in
TIME_WAIT state, without waiting for its natural timeout to
expire. If not specified will automatically be set to True on
UNIX.
reuse_port tells the kernel to allow this endpoint to be bound to
the same port as other existing endpoints are bound to, so long as
they all set this flag when being created. This option is not
supported on Windows.
ssl_handshake_timeout is the time in seconds that an SSL server
will wait for completion of the SSL handshake before aborting the
connection. Default is 60s.
start_serving set to True (default) causes the created server
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sock can optionally be specified in order to use a preexisting
socket object.
backlog is the maximum number of queued connections passed to
listen() (defaults to 100).
ssl can be set to an SSLContext to enable SSL over the
accepted connections.
ssl_handshake_timeout is the time in seconds that an SSL server
will wait for the SSL handshake to complete (defaults to 60s).
start_serving set to True (default) causes the created server
to start accepting connections immediately. When set to False,
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Nrd )r! r� r� r� r� r� r� ri r& r& r' �create_unix_server� s z$AbstractEventLoop.create_unix_server)r� r� r� r� r� �allow_broadcastr� c � s t �dS )a� A coroutine which creates a datagram endpoint.
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protocol_factory must be a callable returning a protocol instance.
socket family AF_INET, socket.AF_INET6 or socket.AF_UNIX depending on
host (or family if specified), socket type SOCK_DGRAM.
reuse_address tells the kernel to reuse a local socket in
TIME_WAIT state, without waiting for its natural timeout to
expire. If not specified it will automatically be set to True on
UNIX.
reuse_port tells the kernel to allow this endpoint to be bound to
the same port as other existing endpoints are bound to, so long as
they all set this flag when being created. This option is not
supported on Windows and some UNIX's. If the
:py:data:`~socket.SO_REUSEPORT` constant is not defined then this
capability is unsupported.
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messages to the broadcast address.
sock can optionally be specified in order to use a preexisting
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Nrd ) r! r� r� Z remote_addrr� r� r� r� r� r� r� r& r& r' �create_datagram_endpoint� s !z*AbstractEventLoop.create_datagram_endpointc � s t �dS )a Register read pipe in event loop. Set the pipe to non-blocking mode.
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remove_reader� s z AbstractEventLoop.remove_readerc G s t �d S r; rd r� r& r& r' �
add_writer� s z AbstractEventLoop.add_writerc C s t �d S r; rd r� r& r& r' �
remove_writer� s z AbstractEventLoop.remove_writerc � s t �d S r; rd )r! r� �nbytesr& r& r' � sock_recv s zAbstractEventLoop.sock_recvc � s t �d S r; rd )r! r� Zbufr& r& r' �sock_recv_into s z AbstractEventLoop.sock_recv_intoc � s t �d S r; rd )r! r� �datar& r& r' � sock_sendall s z AbstractEventLoop.sock_sendallc � s t �d S r; rd )r! r� Zaddressr& r& r' � sock_connect s z AbstractEventLoop.sock_connectc � s t �d S r; rd )r! r� r& r& r' � sock_accept s z AbstractEventLoop.sock_acceptc � s t �d S r; rd )r! r� r� r� r� r� r& r& r' �
sock_sendfile s z AbstractEventLoop.sock_sendfilec G s t �d S r; rd )r! �sigr" r# r& r& r' �add_signal_handler s z$AbstractEventLoop.add_signal_handlerc C s t �d S r; rd )r! r� r& r& r' �remove_signal_handler s z'AbstractEventLoop.remove_signal_handlerc C s t �d S r; rd )r! �factoryr& r& r' �set_task_factory s z"AbstractEventLoop.set_task_factoryc C s t �d S r; rd r9 r& r& r' �get_task_factory" s z"AbstractEventLoop.get_task_factoryc C s t �d S r; rd r9 r& r& r' �get_exception_handler' s z'AbstractEventLoop.get_exception_handlerc C s t �d S r; rd )r! Zhandlerr& r& r' �set_exception_handler* s z'AbstractEventLoop.set_exception_handlerc C s t �d S r; rd �r! r% r& r& r' �default_exception_handler- s z+AbstractEventLoop.default_exception_handlerc C s t �d S r; rd r� r& r& r' rB 0 s z(AbstractEventLoop.call_exception_handlerc C s t �d S r; rd r9 r& r& r' r 5 s zAbstractEventLoop.get_debugc C s t �d S r; rd )r! Zenabledr& r& r' � set_debug8 s zAbstractEventLoop.set_debug)r )NN)NN)r N)N)N)NN)r N);r- rG rH rI rn ro rp rq rr rf rs rb rv rt rw rx ry r| r} r� r� r� r� r� �socketZ AF_UNSPECZ
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It should never return None.Nrd r9 r& r& r' r ? s z&AbstractEventLoopPolicy.get_event_loopc C s t �dS )z3Set the event loop for the current context to loop.Nrd �r! r$ r& r& r' r I s z&AbstractEventLoopPolicy.set_event_loopc C s t �dS )z�Create and return a new event loop object according to this
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dS )r aH Abstract base class for monitoring child processes.
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c C s i | _ d | _d S r )r) �_saved_sighandlerr� r r r r z s z MultiLoopChildWatcher.__init__c C s
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� Zd S ) r a Common base class for protocol interfaces.
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� c C s dS )z�Called when a connection is made.
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are important to ensure that things go as expected when either
mark is zero.
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r c C s dS )zTCalled when some data is received.
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one for IPv4 and another one for IPv6). The host parameter can also be
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family can be set to either AF_INET or AF_INET6 to force the
socket to use IPv4 or IPv6. If not set it will be determined
from host (defaults to AF_UNSPEC).
flags is a bitmask for getaddrinfo().
sock can optionally be specified in order to use a preexisting
socket object.
backlog is the maximum number of queued connections passed to
listen() (defaults to 100).
ssl can be set to an SSLContext to enable SSL over the
accepted connections.
reuse_address tells the kernel to reuse a local socket in
TIME_WAIT state, without waiting for its natural timeout to
expire. If not specified will automatically be set to True on
UNIX.
reuse_port tells the kernel to allow this endpoint to be bound to
the same port as other existing endpoints are bound to, so long as
they all set this flag when being created. This option is not
supported on Windows.
ssl_handshake_timeout is the time in seconds that an SSL server
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connection. Default is 60s.
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socket object.
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listen() (defaults to 100).
ssl can be set to an SSLContext to enable SSL over the
accepted connections.
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will wait for the SSL handshake to complete (defaults to 60s).
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Nrc )r! r� r� r� r� r� r� rh r& r& r' �create_unix_server� s z$AbstractEventLoop.create_unix_server)r� r� r� r� r� �allow_broadcastr� c � s t �dS )a� A coroutine which creates a datagram endpoint.
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protocol_factory must be a callable returning a protocol instance.
socket family AF_INET, socket.AF_INET6 or socket.AF_UNIX depending on
host (or family if specified), socket type SOCK_DGRAM.
reuse_address tells the kernel to reuse a local socket in
TIME_WAIT state, without waiting for its natural timeout to
expire. If not specified it will automatically be set to True on
UNIX.
reuse_port tells the kernel to allow this endpoint to be bound to
the same port as other existing endpoints are bound to, so long as
they all set this flag when being created. This option is not
supported on Windows and some UNIX's. If the
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remove_writer� s z AbstractEventLoop.remove_writerc � s t �d S r; rc )r! r� �nbytesr& r& r' � sock_recv s zAbstractEventLoop.sock_recvc � s t �d S r; rc )r! r� Zbufr& r& r' �sock_recv_into s z AbstractEventLoop.sock_recv_intoc � s t �d S r; rc )r! r� �datar& r& r' � sock_sendall s z AbstractEventLoop.sock_sendallc � s t �d S r; rc )r! r� Zaddressr& r& r' � sock_connect s z AbstractEventLoop.sock_connectc � s t �d S r; rc )r! r� r& r& r' � sock_accept s z AbstractEventLoop.sock_acceptc � s t �d S r; rc )r! r� r� r� r� r� r& r& r' �
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pyepat.abc (> 1.0, < 3333.3a1, != 1555.1b3)
The `satisfied_by()` method can be used to determine with a given
version number is included in the set described by the version
restrictions::
>>> v.satisfied_by('1.1')
True
>>> v.satisfied_by('1.4')
True
>>> v.satisfied_by('1.0')
False
>>> v.satisfied_by('4444.4')
False
>>> v.satisfied_by('1555.1b3')
False
`VersionPredicate` is flexible in accepting extra whitespace::
>>> v = VersionPredicate(' pat( == 0.1 ) ')
>>> v.name
'pat'
>>> v.satisfied_by('0.1')
True
>>> v.satisfied_by('0.2')
False
If any version numbers passed in do not conform to the
restrictions of `StrictVersion`, a `ValueError` is raised::
>>> v = VersionPredicate('p1.p2.p3.p4(>=1.0, <=1.3a1, !=1.2zb3)')
Traceback (most recent call last):
...
ValueError: invalid version number '1.2zb3'
It the module or package name given does not conform to what's
allowed as a legal module or package name, `ValueError` is
raised::
>>> v = VersionPredicate('foo-bar')
Traceback (most recent call last):
...
ValueError: expected parenthesized list: '-bar'
>>> v = VersionPredicate('foo bar (12.21)')
Traceback (most recent call last):
...
ValueError: expected parenthesized list: 'bar (12.21)'
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...
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The defaults are implementation-specific. If only the
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implementation-specific value less than or equal to the
high-water limit. Setting high to zero forces low to zero as
well, and causes pause_writing() to be called whenever the
buffer becomes non-empty. Setting low to zero causes
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The arguments are all the usual arguments to create_connection()
except protocol_factory; most common are positional host and port,
with various optional keyword arguments following.
Additional optional keyword arguments are loop (to set the event loop
instance to use) and limit (to set the buffer limit passed to the
StreamReader).
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if it is a coroutine, it will be automatically converted into a
Task.
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loop.create_server() except protocol_factory; most common are
positional host and port, with various optional keyword arguments
following. The return value is the same as loop.create_server().
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instance to use) and limit (to set the buffer limit passed to the
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separator.
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buffer will be reset. The IncompleteReadError.partial attribute
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object.
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Controls for how messages are interpreted and formatted.
Most of the classes and many of the methods in the email package accept
Policy objects as parameters. A Policy object contains a set of values and
functions that control how input is interpreted and how output is rendered.
For example, the parameter 'raise_on_defect' controls whether or not an RFC
violation results in an error being raised or not, while 'max_line_length'
controls the maximum length of output lines when a Message is serialized.
Any valid attribute may be overridden when a Policy is created by passing
it as a keyword argument to the constructor. Policy objects are immutable,
but a new Policy object can be created with only certain values changed by
calling the Policy instance with keyword arguments. Policy objects can
also be added, producing a new Policy object in which the non-default
attributes set in the right hand operand overwrite those specified in the
left operand.
Settable attributes:
raise_on_defect -- If true, then defects should be raised as errors.
Default: False.
linesep -- string containing the value to use as separation
between output lines. Default '\n'.
cte_type -- Type of allowed content transfer encodings
7bit -- ASCII only
8bit -- Content-Transfer-Encoding: 8bit is allowed
Default: 8bit. Also controls the disposition of
(RFC invalid) binary data in headers; see the
documentation of the binary_fold method.
max_line_length -- maximum length of lines, excluding 'linesep',
during serialization. None or 0 means no line
wrapping is done. Default is 78.
mangle_from_ -- a flag that, when True escapes From_ lines in the
body of the message by putting a `>' in front of
them. This is used when the message is being
serialized by a generator. Default: True.
message_factory -- the class to use to create new message objects.
If the value is None, the default is Message.
verify_generated_headers
-- if true, the generator verifies that each header
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Because the default behavior of Message's __setitem__ is to append the
value to the list of headers, it is easy to create duplicate headers
without realizing it. This method allows certain headers to be limited
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Message programmatically. (The limit is not observed by the parser,
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Headers are folded using the Header folding algorithm, which preserves
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PROVISIONAL
The API extensions enabled by this policy are currently provisional.
Refer to the documentation for details.
This policy adds new header parsing and folding algorithms. Instead of
simple strings, headers are custom objects with custom attributes
depending on the type of the field. The folding algorithm fully
implements RFCs 2047 and 5322.
In addition to the settable attributes listed above that apply to
all Policies, this policy adds the following additional attributes:
utf8 -- if False (the default) message headers will be
serialized as ASCII, using encoded words to encode
any non-ASCII characters in the source strings. If
True, the message headers will be serialized using
utf8 and will not contain encoded words (see RFC
6532 for more on this serialization format).
refold_source -- if the value for a header in the Message object
came from the parsing of some source, this attribute
indicates whether or not a generator should refold
that value when transforming the message back into
stream form. The possible values are:
none -- all source values use original folding
long -- source values that have any line that is
longer than max_line_length will be
refolded
all -- all values are refolded.
The default is 'long'.
header_factory -- a callable that takes two arguments, 'name' and
'value', where 'name' is a header field name and
'value' is an unfolded header field value, and
returns a string-like object that represents that
header. A default header_factory is provided that
understands some of the RFC5322 header field types.
(Currently address fields and date fields have
special treatment, while all other fields are
treated as unstructured. This list will be
completed before the extension is marked stable.)
content_manager -- an object with at least two methods: get_content
and set_content. When the get_content or
set_content method of a Message object is called,
it calls the corresponding method of this object,
passing it the message object as its first argument,
and any arguments or keywords that were passed to
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The value is determined by stripping leading whitespace off the
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The name is returned unchanged. If the input value has a 'name'
attribute and it matches the name ignoring case, the value is returned
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object of some sort). If a source value needs to be refolded according
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the name and the value with any linesep characters removed to the
header_factory method. Folding of a custom header object is done by
calling its fold method with the current policy.
Source values are split into lines using splitlines. If the value is
not to be refolded, the lines are rejoined using the linesep from the
policy and returned. The exception is lines containing non-ascii
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refold_header setting, since there is no way to know whether the binary
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This module provides an implementation of the HeaderRegistry API.
The implementation is designed to flexibly follow RFC5322 rules.
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must be properly quoted according to RFC 5322 rules; an error will be
raised if it is not.
An Address object has display_name, username, domain, and addr_spec
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Address objects. A Group can also be used to represent a single
address that is not in a group, which is convenient when manipulating
lists that are a combination of Groups and individual Addresses. In
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the dictionary must contain two additional keys: parse_tree, set to the
parse tree obtained from parsing the header, and 'decoded', set to the
string value of the idealized representation of the data from the value.
(That is, encoded words are decoded, and values that have canonical
representations are so represented.)
The defects key is intended to collect parsing defects, which the message
parser will subsequently dispose of as appropriate. The parser should not,
insofar as practical, raise any errors. Defects should be added to the
list instead. The standard header parsers register defects for RFC
compliance issues, for obsolete RFC syntax, and for unrecoverable parsing
errors.
The parse method may add additional keys to the dictionary. In this case
the subclass must define an 'init' method, which will be passed the
dictionary as its keyword arguments. The method should use (usually by
setting them as the value of similarly named attributes) and remove all the
extra keys added by its parse method, and then use super to call its parent
class with the remaining arguments and keywords.
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that is either None or 1. XXX: need to better define this API.
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Any non-ASCII characters in the parse tree are CTE encoded using
charset utf-8. XXX: make this a policy setting.
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It is used in the MIME standards for email to attach images, audio, and text
using some 8-bit character sets to messages.
This module provides an interface to encode and decode both headers and bodies
with Base64 encoding.
RFC 2045 defines a method for including character set information in an
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in To:, From:, Cc:, etc. fields, as well as Subject: lines.
This module does not do the line wrapping or end-of-line character conversion
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| tj |�f S d| |f S n| S dS ) a~ Convenience function to format and return a key=value pair.
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Message objects implement part of the `mapping' interface, which assumes
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you must use the explicit API to set or get all the headers. Not all of
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The message will be assumed to be of type text/* encoded with
charset.input_charset. It will be converted to charset.output_charset
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zMessage.valuesc s � fdd�� j D �S )a' Get all the message's header fields and values.
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c s" g | ]\}}|� j j||�f�qS r )r4 r� )r rz r{ )r; r r r� � s z!Message.items.<locals>.<listcomp>)r5 )r; r )r; r �items� s
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parameter value contains non-ASCII characters it can be specified as a
three-tuple of (charset, language, value), in which case it will be
encoded according to RFC2231 rules. Otherwise it will be encoded using
the utf-8 charset and a language of ''.
Examples:
msg.add_header('content-disposition', 'attachment', filename='bud.gif')
msg.add_header('content-disposition', 'attachment',
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msg.add_header('content-disposition', 'attachment',
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N�_�-r )r� r, rT r% �insert� SEMISPACErc )r; �_name�_valueZ_params�partsrz r{ r r r ro s zMessage.add_headerc C s^ |j � }xPttt| j��| j�D ].\}\}}|j � |kr | jj||�| j|< P q W t|��dS )z�Replace a header.
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message, the default type as given by get_default_type() will be
returned. Since according to RFC 2045, messages always have a default
type this will always return a value.
RFC 2045 defines a message's default type to be text/plain unless it
appears inside a multipart/digest container, in which case it would be
message/rfc822.
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text/plain)�objectr] �get_default_typer r+ r) )r; �missingr$ �ctyper r r �get_content_type4 s
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the parameter the value is the empty string. The value is as
described in the get_param() method.
Optional failobj is the object to return if there is no Content-Type
header. Optional header is the header to search instead of
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zMessage.get_paramsc C sJ || kr |S x8| j ||�D ](\}}|j� |j� kr|r>t|�S |S qW |S )a� Return the parameter value if found in the Content-Type header.
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value can either be a string, or a 3-tuple if the parameter was RFC
2231 encoded. When it's a 3-tuple, the elements of the value are of
the form (CHARSET, LANGUAGE, VALUE). Note that both CHARSET and
LANGUAGE can be None, in which case you should consider VALUE to be
encoded in the us-ascii charset. You can usually ignore LANGUAGE.
The parameter value (either the returned string, or the VALUE item in
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If your application doesn't care whether the parameter was RFC 2231
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value will be appended as per RFC 2045.
An alternate header can be specified in the header argument, and all
parameters will be quoted as necessary unless requote is False.
If charset is specified, the parameter will be encoded according to RFC
2231. Optional language specifies the RFC 2231 language, defaulting
to the empty string. Both charset and language should be strings.
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zMessage.set_paramc C s� || kr dS d}xR| j ||d�D ]@\}}|j� |j� kr |sJt|||�}q tj|t|||�g�}q W || j|�kr�| |= || |< dS )a> Remove the given parameter completely from the Content-Type header.
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Nr )r� r2 )r� r+ r% r� rc r] )r; r r� r� Z new_ctyper� r{ r r r rn � s zMessage.del_paramc C s� |j d�dkst�|j� dkr,| d= d| d< || kr@|| |< dS | j||d�}| |= || |< x(|dd� D ]\}}| j||||� qjW dS ) aK Set the main type and subtype for the Content-Type header.
type must be a string in the form "maintype/subtype", otherwise a
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parameters in place. If requote is False, this leaves the existing
header's quoting as is. Otherwise, the parameters will be quoted (the
default).
An alternative header can be specified in the header argument. When
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header.
r� r z content-typez mime-versionz1.0z MIME-VersionN)r� r2 )r) ru r+ r� rp )r; r\ r� r� r� r� r{ r r r �set_type s zMessage.set_typec C sD t � }| jd|d�}||kr*| jd|d�}||kr6|S tj|�j� S )a@ Return the filename associated with the payload if present.
The filename is extracted from the Content-Disposition header's
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�filenamezcontent-dispositionrs z content-type)r� r_ r �collapse_rfc2231_valuer )r; r� r� r� r r r � get_filename& s zMessage.get_filenamec C s, t � }| jd|�}||kr |S tj|�j� S )z�Return the boundary associated with the payload if present.
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HeaderParseError is raised if the message has no Content-Type header.
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r� |S X |j� S )z�Return the charset parameter of the Content-Type header.
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main MIME type of "text", or the charset is not defined.
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The parsing methods defined in this module implement various email related
parsing rules. Principal among them is RFC 5322, which is the followon
to RFC 2822 and primarily a clarification of the former. It also implements
RFC 2047 encoded word decoding.
RFC 5322 goes to considerable trouble to maintain backward compatibility with
RFC 822 in the parse phase, while cleaning up the structure on the generation
phase. This parser supports correct RFC 5322 generation by tagging white space
as folding white space only when folding is allowed in the non-obsolete rule
sets. Actually, the parser is even more generous when accepting input than RFC
5322 mandates, following the spirit of Postel's Law, which RFC 5322 encourages.
Where possible deviations from the standard are annotated on the 'defects'
attribute of tokens that deviate.
The general structure of the parser follows RFC 5322, and uses its terminology
where there is a direct correspondence. Where the implementation requires a
somewhat different structure than that used by the formal grammar, new terms
that mimic the closest existing terms are used. Thus, it really helps to have
a copy of RFC 5322 handy when studying this code.
Input to the parser is a string that has already been unfolded according to
RFC 5322 rules. According to the RFC this unfolding is the very first step, and
this parser leaves the unfolding step to a higher level message parser, which
will have already detected the line breaks that need unfolding while
determining the beginning and end of each header.
The output of the parser is a TokenList object, which is a list subclass. A
TokenList is a recursive data structure. The terminal nodes of the structure
are Terminal objects, which are subclasses of str. These do not correspond
directly to terminal objects in the formal grammar, but are instead more
practical higher level combinations of true terminals.
All TokenList and Terminal objects have a 'value' attribute, which produces the
semantically meaningful value of that part of the parse subtree. The value of
all whitespace tokens (no matter how many sub-tokens they may contain) is a
single space, as per the RFC rules. This includes 'CFWS', which is herein
included in the general class of whitespace tokens. There is one exception to
the rule that whitespace tokens are collapsed into single spaces in values: in
the value of a 'bare-quoted-string' (a quoted-string with no leading or
trailing whitespace), any whitespace that appeared between the quotation marks
is preserved in the returned value. Note that in all Terminal strings quoted
pairs are turned into their unquoted values.
All TokenList and Terminal objects also have a string value, which attempts to
be a "canonical" representation of the RFC-compliant form of the substring that
produced the parsed subtree, including minimal use of quoted pair quoting.
Whitespace runs are not collapsed.
Comment tokens also have a 'content' attribute providing the string found
between the parens (including any nested comments) with whitespace preserved.
All TokenList and Terminal objects have a 'defects' attribute which is a
possibly empty list all of the defects found while creating the token. Defects
may appear on any token in the tree, and a composite list of all defects in the
subtree is available through the 'all_defects' attribute of any node. (For
Terminal notes x.defects == x.all_defects.)
Each object in a parse tree is called a 'token', and each has a 'token_type'
attribute that gives the name from the RFC 5322 grammar that it represents.
Not all RFC 5322 nodes are produced, and there is one non-RFC 5322 node that
may be produced: 'ptext'. A 'ptext' is a string of printable ascii characters.
It is returned in place of lists of (ctext/quoted-pair) and
(qtext/quoted-pair).
XXX: provide complete list of token types.
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all_mailboxes)r r r r r r - s z,AddressList.all_mailboxes.<locals>.<genexpr>)r' )r r r r r_ + s zAddressList.all_mailboxesN)r$ r9 r: r7 r= r] r^ r_ r r r r r[ s r[ c @ s4 e Zd ZdZedd� �Zedd� �Zedd� �ZdS ) �Addressr\ c C s | d j dkr| d jS d S )Nr �group)r7 � display_name)r r r r rb 5 s zAddress.display_namec C s4 | d j dkr| d gS | d j dkr*g S | d jS )Nr �mailboxzinvalid-mailbox)r7 r^ )r r r r r^ : s
zAddress.mailboxesc C s: | d j dkr| d gS | d j dkr0| d gS | d jS )Nr rc zinvalid-mailbox)r7 r_ )r r r r r_ B s
zAddress.all_mailboxesN)r$ r9 r: r7 r= rb r^ r_ r r r r r` 1 s r` c @ s( e Zd ZdZedd� �Zedd� �ZdS )� MailboxListz mailbox-listc C s dd� | D �S )Nc S s g | ]}|j d kr|�qS )rc )r7 )r r r r r rC P s z)MailboxList.mailboxes.<locals>.<listcomp>r )r r r r r^ N s zMailboxList.mailboxesc C s dd� | D �S )Nc S s g | ]}|j dkr|�qS )rc �invalid-mailbox)rc re )r7 )r r r r r rC T s z-MailboxList.all_mailboxes.<locals>.<listcomp>r )r r r r r_ R s zMailboxList.all_mailboxesN)r$ r9 r: r7 r= r^ r_ r r r r rd J s rd c @ s( e Zd ZdZedd� �Zedd� �ZdS )� GroupListz
group-listc C s" | s| d j dkrg S | d jS )Nr z mailbox-list)r7 r^ )r r r r r^ \ s zGroupList.mailboxesc C s" | s| d j dkrg S | d jS )Nr z mailbox-list)r7 r_ )r r r r r_ b s zGroupList.all_mailboxesN)r$ r9 r: r7 r= r^ r_ r r r r rf X s rf c @ s4 e Zd ZdZedd� �Zedd� �Zedd� �ZdS ) �Groupra c C s | d j dkrg S | d jS )N� z
group-list)r7 r^ )r r r r r^ m s zGroup.mailboxesc C s | d j dkrg S | d jS )Nrh z
group-list)r7 r_ )r r r r r_ s s zGroup.all_mailboxesc C s
| d j S )Nr )rb )r r r r rb y s zGroup.display_nameN)r$ r9 r: r7 r= r^ r_ rb r r r r rg i s rg c @ sL e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zed
d � �Z d S )
�NameAddrz name-addrc C s t | �dkrd S | d jS )N� r )�lenrb )r r r r rb � s zNameAddr.display_namec C s
| d j S )Nrj ���)�
local_part)r r r r rm � s zNameAddr.local_partc C s
| d j S )Nrj rl )�domain)r r r r rn � s zNameAddr.domainc C s
| d j S )Nrj rl )�route)r r r r ro � s zNameAddr.routec C s
| d j S )Nrj rl )� addr_spec)r r r r rp � s zNameAddr.addr_specN)
r$ r9 r: r7 r= rb rm rn ro rp r r r r ri ~ s ri c @ s@ e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zd
S ) � AngleAddrz
angle-addrc C s" x | D ]}|j dkr|jS qW d S )Nz addr-spec)r7 rm )r r r r r rm � s
zAngleAddr.local_partc C s" x | D ]}|j dkr|jS qW d S )Nz addr-spec)r7 rn )r r r r r rn � s
zAngleAddr.domainc C s" x | D ]}|j dkr|jS qW d S )Nz obs-route)r7 �domains)r r r r r ro � s
zAngleAddr.routec C s< x6| D ]*}|j dkr|jr |jS t|j�|j S qW dS d S )Nz addr-specz<>)r7 rm rp r )r r r r r rp � s
zAngleAddr.addr_specN) r$ r9 r: r7 r= rm rn ro rp r r r r rq � s
rq c @ s e Zd ZdZedd� �ZdS )�ObsRoutez obs-routec C s dd� | D �S )Nc S s g | ]}|j d kr|j�qS )rn )r7 rn )r r r r r rC � s z$ObsRoute.domains.<locals>.<listcomp>r )r r r r rr � s zObsRoute.domainsN)r$ r9 r: r7 r= rr r r r r rs � s rs c @ sL e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zed
d � �Z d S )
�Mailboxrc c C s | d j dkr| d jS d S )Nr z name-addr)r7 rb )r r r r rb � s zMailbox.display_namec C s
| d j S )Nr )rm )r r r r rm � s zMailbox.local_partc C s
| d j S )Nr )rn )r r r r rn � s zMailbox.domainc C s | d j dkr| d jS d S )Nr z name-addr)r7 ro )r r r r ro � s z
Mailbox.routec C s
| d j S )Nr )rp )r r r r rp � s zMailbox.addr_specN)
r$ r9 r: r7 r= rb rm rn ro rp r r r r rt � s rt c @ s, e Zd ZdZedd� �Ze Z Z ZZ dS )�InvalidMailboxzinvalid-mailboxc C s d S )Nr )r r r r rb � s zInvalidMailbox.display_nameN)
r$ r9 r: r7 r= rb rm rn ro rp r r r r ru � s ru c s( e Zd ZdZdZe� fdd��Z� ZS )�Domainrn Fc s dj t� jj� �S )Nr )r! r r �split)r )r r r rn � s z
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dot-atom-textTN)r$ r9 r: r7 r) r r r r ry � s ry c @ sD e Zd ZdZdZedd� �Zedd� �Zedd� �Zed d
� �Z d S ) �AddrSpecz addr-specFc C s
| d j S )Nr )rm )r r r r rm s zAddrSpec.local_partc C s t | �dk rd S | d jS )N� rj rl )rk rn )r r r r rn s zAddrSpec.domainc C s< t | �dk r| d jS | d jj� | d j | d jj� S )Nr{ r rj rh )rk r �rstrip�lstrip)r r r r r s
zAddrSpec.valuec C sL t | j�}t|�t|t �kr*t| j�}n| j}| jd k rH|d | j S |S )N�@)�setrm rk �
DOT_ATOM_ENDSr rn )r ZnamesetZlpr r r rp s
zAddrSpec.addr_specN)
r$ r9 r: r7 r) r= rm rn r rp r r r r rz � s rz c @ s e Zd ZdZdZdS )� ObsLocalPartzobs-local-partFN)r$ r9 r: r7 r) r r r r r� s r� c s4 e Zd ZdZdZedd� �Ze� fdd��Z� ZS )� DisplayNamez display-nameFc C s� t | �}|d jdkr"|jd� n*|d d jdkrLt |d dd � �|d< |d jdkrd|j� n*|d d jdkr�t |d d d� �|d < |jS )
Nr rJ rj rl rl rl rl rl rl )r r7 �popr )r rT r r r rb + s
zDisplayName.display_namec s� d}| j rd}n x| D ]}|jdkrd}qW |r�d }}| d jdksX| d d jdkr\d}| d jdks|| d
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quoted-stringr r rJ r@ rj rl rl rl )r r7 r rb r r )r rY r ZpreZpost)r r r r : s
zDisplayName.value) r$ r9 r: r7 r< r= rb r r> r r )r r r� & s r� c @ s, e Zd ZdZdZedd� �Zedd� �ZdS )� LocalPartz
local-partFc C s& | d j dkr| d jS | d jS d S )Nr z
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zLocalPart.local_partN)r$ r9 r: r7 r) r= r rm r r r r r� N s r� c s4 e Zd ZdZdZe� fdd��Zedd� �Z� ZS )�
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zDomainLiteral.ip) r$ r9 r: r7 r) r= rn r� r> r r )r r r� r s r� c @ s e Zd ZdZdZdZdS )� MIMEVersionz mime-versionN)r$ r9 r: r7 �major�minorr r r r r� � s r� c @ s4 e Zd ZdZdZdZdZedd� �Zedd� �Z dS ) � Parameter� parameterFzus-asciic C s | j r| d jS dS )Nrj r )� sectioned�number)r r r r �section_number� s zParameter.section_numberc C sb x\| D ]T}|j dkr|jS |j dkrx4|D ],}|j dkr*x |D ]}|j dkr>|jS q>W q*W qW dS )Nr z
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zParameter.param_valueN)
r$ r9 r: r7 r� �extendedrP r= r� r� r r r r r� � s r� c @ s e Zd ZdZdS )�InvalidParameterzinvalid-parameterN)r$ r9 r: r7 r r r r r� � s r� c @ s e Zd ZdZedd� �ZdS )� Attribute� attributec C s$ x | D ]}|j jd�r|jS qW d S )N�attrtext)r7 �endswithr )r r. r r r rV � s
zAttribute.stripped_valueN)r$ r9 r: r7 r= rV r r r r r� � s r� c @ s e Zd ZdZdZdS )�Section�sectionN)r$ r9 r: r7 r� r r r r r� � s r� c @ s e Zd ZdZedd� �ZdS )�Valuer c C s2 | d }|j dkr| d }|j jd�r,|jS | jS )Nr rJ rj �
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zValue.stripped_valueN)r$ r9 r: r7 r= rV r r r r r� � s r� c @ s( e Zd ZdZdZedd� �Zdd� ZdS )�MimeParameterszmime-parametersFc c s� t � }x\| D ]T}|jjd�s q |d jdkr.q |d jj� }||krLg ||< || j|j|f� q W �x�|j� D �]�\}}t|t d�d�}|d d }|j
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zMimeParameters.__str__N)r$ r9 r: r7 r; r= r� r" r r r r r� � s Fr� c @ s e Zd ZdZedd� �ZdS )�ParameterizedHeaderValueFc C s& x t | �D ]}|jdkr
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d� fd d � Z d
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dd� Z� ZS )�TerminalTc s t � j| |�}||_g |_|S )N)r �__new__r7 r )�clsr r7 r )r r r r� X s zTerminal.__new__c s dj | jjt� j� �S )Nz{}({}))r# r r$ r r% )r )r r r r% ^ s zTerminal.__repr__c C s t | jjd | j � d S )N�/)r3 r r$ r7 )r r r r r5 a s zTerminal.pprintc C s
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{}{}/{}({}){}r z {})r# r r$ r7 r r% r )r r2 )r r r r6 h s z Terminal._ppc C s d S )Nr )r r r r �pop_trailing_wsq s zTerminal.pop_trailing_wsc C s g S )Nr )r r r r r- u s zTerminal.commentsc C s t | �| jfS )N)r r7 )r r r r �__getnewargs__y s zTerminal.__getnewargs__)r )r$ r9 r: r) r< r; r� r% r5 r= r& r6 r� r- r� r> r r )r r r� R s r� c @ s e Zd Zedd� �Zdd� ZdS )�WhiteSpaceTerminalc C s dS )Nr@ r )r r r r r s zWhiteSpaceTerminal.valuec C s dS )NTr )r r r r r( � s z!WhiteSpaceTerminal.startswith_fwsN)r$ r9 r: r= r r( r r r r r� } s r� c @ s e Zd Zedd� �Zdd� ZdS )�
ValueTerminalc C s | S )Nr )r r r r r � s zValueTerminal.valuec C s dS )NFr )r r r r r( � s z ValueTerminal.startswith_fwsN)r$ r9 r: r= r r( r r r r r� � s r� c @ s e Zd Zedd� �Zdd� ZdS )�EWWhiteSpaceTerminalc C s dS )Nr r )r r r r r � s zEWWhiteSpaceTerminal.valuec C s dS )Nr r )r r r r r" � s z EWWhiteSpaceTerminal.__str__N)r$ r9 r: r= r r" r r r r r� � s r� r� �,zlist-separatorr~ zroute-component-markerz([{}]+)r z[^{}]+r z\\�]z\]z[\x00-\x20\x7F]c C s> t | �}|r | jjtj|�� tj| �r:| jjtjd�� dS )z@If input token contains ASCII non-printables, register a defect.z*Non-ASCII characters found in header tokenN)�_non_printable_finderr rS r ZNonPrintableDefectr r� r� )�xtextZnon_printablesr r r �_validate_xtext� s
r� c C s� t | d�^}}g }d}d}xbtt|��D ]J}|| dkrL|rFd}d}nd}q(|rVd}n|| |krdP |j|| � q(W |d }dj|�dj||d� g| �|fS )ak Scan printables/quoted-pairs until endchars and return unquoted ptext.
This function turns a run of qcontent, ccontent-without-comments, or
dtext-with-quoted-printables into a single string by unquoting any
quoted printables. It returns the string, the remaining value, and
a flag that is True iff there were any quoted printables decoded.
rj Fr Tr N)�
_wsp_splitter�rangerk rS r! )r �endcharsZfragment� remainderZvchars�escape�had_qp�posr r r �_get_ptext_to_endchars� s$ r� c C s. | j � }t| dt| �t|� � d�}||fS )z�FWS = 1*WSP
This isn't the RFC definition. We're using fws to represent tokens where
folding can be done, but when we are parsing the *un*folding has already
been done so we don't need to watch out for CRLF.
N�fws)r} r� rk )r Znewvaluer� r r r �get_fws� s r� c
C s� t � }| jd�s tjdj| ���| dd� jdd�^}}|| dd� krXtjdj| ���dj|�}t|�dkr�|d tkr�|d tkr�|jdd�^}}|d | }t|j� �dkr�|j j
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| � dj|�}�q6W || fS ) zE encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
z=?z"expected encoded word but found {}rh Nz?=rj r r z whitespace inside encoded wordz!encoded word format invalid: '{}'�vtext)rN �
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r� c C s t � }�x| �r | d tkr4t| �\}} |j|� q
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W |S )aO unstructured = (*([FWS] vchar) *WSP) / obs-unstruct
obs-unstruct = *((*LF *CR *(obs-utext) *LF *CR)) / FWS)
obs-utext = %d0 / obs-NO-WS-CTL / LF / CR
obs-NO-WS-CTL is control characters except WSP/CR/LF.
So, basically, we have printable runs, plus control characters or nulls in
the obsolete syntax, separated by whitespace. Since RFC 2047 uses the
obsolete syntax in its specification, but requires whitespace on either
side of the encoded words, I can see no reason to need to separate the
non-printable-non-whitespace from the printable runs if they occur, so we
parse this into xtext tokens separated by WSP tokens.
Because an 'unstructured' value must by definition constitute the entire
value, this 'get' routine does not return a remaining value, only the
parsed TokenList.
r z=?Trj r� z&missing whitespace before encoded wordFrh z encoded-wordr� r rl ���rl rl )rD r� r� rS r� r� r r� rk r7 r r� r� r� r� r� r! )r rE r. Zhave_wsr� r� r� r r r �get_unstructured! s:
r� c C s* t | d�\}} }t|d�}t|� || fS )a ctext = <printable ascii except \ ( )>
This is not the RFC ctext, since we are handling nested comments in comment
and unquoting quoted-pairs here. We allow anything except the '()'
characters, but if we find any ASCII other than the RFC defined printable
ASCII, a NonPrintableDefect is added to the token's defects list. Since
quoted pairs are converted to their unquoted values, what is returned is
a 'ptext' token. In this case it is a WhiteSpaceTerminal, so it's value
is ' '.
z()r� )r� r� r� )r r� �_r r r � get_qp_ctextY s
r� c C s* t | d�\}} }t|d�}t|� || fS )ao qcontent = qtext / quoted-pair
We allow anything except the DQUOTE character, but if we find any ASCII
other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Any quoted pairs are converted to their
unquoted values, so what is returned is a 'ptext' token. In this case it
is a ValueTerminal.
r
r� )r� r� r� )r r� r� r r r � get_qcontentj s
r� c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )z�atext = <matches _atext_matcher>
We allow any non-ATOM_ENDS in atext, but add an InvalidATextDefect to
the token's defects list if we find non-atext characters.
z expected atext but found '{}'N�atext)�_non_atom_end_matcherr r� r# ra rk r� r� )r �mr� r r r � get_atexty s
r� c C s | d dkr t jdj| ���t� }| dd� } | d dkrPt| �\}} |j|� x�| r�| d dkr�| d tkr|t| �\}} nd| dd� dkr�y"t| �\}} |j jt j
d�� W q� t jk
r� t| �\}} Y q�X n t| �\}} |j|� qRW | �s|j jt j
d �� || fS || dd� fS )
z�bare-quoted-string = DQUOTE *([FWS] qcontent) [FWS] DQUOTE
A quoted-string without the leading or trailing white space. Its
value is the text between the quote marks, with whitespace
preserved and quoted pairs decoded.
r r
zexpected '"' but found '{}'rj Nrh z=?z!encoded word inside quoted stringz"end of header inside quoted string) r r� r# rW r� rS r� r� r� r r� )r Zbare_quoted_stringr. r r r �get_bare_quoted_string� s2
r� c C s� | r | d dkr t jdj| ���t� }| dd� } x^| r�| d dkr�| d tkr^t| �\}} n&| d dkrxt| �\}} n t| �\}} |j|� q4W | s�|j jt j
d�� || fS || dd� fS )z�comment = "(" *([FWS] ccontent) [FWS] ")"
ccontent = ctext / quoted-pair / comment
We handle nested comments here, and quoted-pair in our qp-ctext routine.
r r zexpected '(' but found '{}'rj NrZ z end of header inside comment) r r� r# rX r� r� � get_commentr� rS r r� )r rA r. r r r r� � s"
r� c C sT t � }xD| rJ| d tkrJ| d tkr2t| �\}} n t| �\}} |j|� qW || fS )z,CFWS = (1*([FWS] comment) [FWS]) / FWS
r )rI � CFWS_LEADERr� r� r� rS )r rJ r. r r r �get_cfws� s r� c C sp t � }| r,| d tkr,t| �\}} |j|� t| �\}} |j|� | rh| d tkrht| �\}} |j|� || fS )z�quoted-string = [CFWS] <bare-quoted-string> [CFWS]
'bare-quoted-string' is an intermediate class defined by this
parser and not by the RFC grammar. It is the quoted string
without any attached CFWS.
r )rR r� r� rS r� )r Z
quoted_stringr. r r r �get_quoted_string� s
r� c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���| jd�r�yt | �\}} W q� tjk
r� t
| �\}} Y q�X n t
| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )zPatom = [CFWS] 1*atext [CFWS]
An atom could be an rfc2047 encoded word.
r z expected atom but found '{}'z=?) rK r� r� rS � ATOM_ENDSr r� r# r� r� r� )r rL r. r r r �get_atom� s$
r� c C s� t � }| s| d tkr(tjdj| ���xP| rx| d tkrxt| �\}} |j|� | r*| d dkr*|jt� | dd� } q*W |d tkr�tjdjd| ���|| fS )z( dot-text = 1*atext *("." 1*atext)
r z8expected atom at a start of dot-atom-text but found '{}'r rj Nz4expected atom at end of dot-atom-text but found '{}'rl )ry r� r r� r# r� rS r� )r Z
dot_atom_textr. r r r �get_dot_atom_text� s
r� c C s� t � }| d tkr(t| �\}} |j|� | jd�rhyt| �\}} W qt tjk
rd t| �\}} Y qtX n t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )z� dot-atom = [CFWS] dot-atom-text [CFWS]
Any place we can have a dot atom, we could instead have an rfc2047 encoded
word.
r z=?) rx r� r� rS r� r� r r� r� )r Zdot_atomr. r r r � get_dot_atom s
r� c C s� | d t krt| �\}} nd}| d dkr8t| �\}} n*| d tkrVtjdj| ���n t| �\}} |dk rx|g|dd�< || fS )a� word = atom / quoted-string
Either atom or quoted-string may start with CFWS. We have to peel off this
CFWS first to determine which type of word to parse. Afterward we splice
the leading CFWS, if any, into the parsed sub-token.
If neither an atom or a quoted-string is found before the next special, a
HeaderParseError is raised.
The token returned is either an Atom or a QuotedString, as appropriate.
This means the 'word' level of the formal grammar is not represented in the
parse tree; this is because having that extra layer when manipulating the
parse tree is more confusing than it is helpful.
r Nr
z1Expected 'atom' or 'quoted-string' but found '{}')r� r� r� �SPECIALSr r� r# r� )r �leaderr. r r r �get_word* s
r� c C s� t � }yt| �\}} |j|� W n( tjk
rH |jjtjd�� Y nX x�| r�| d tkr�| d dkr�|jt� |jjtj d�� | dd� } qLyt| �\}} W nD tjk
r� | d t
kr�t | �\}} |jjtj d�� n� Y nX |j|� qLW || fS )a� phrase = 1*word / obs-phrase
obs-phrase = word *(word / "." / CFWS)
This means a phrase can be a sequence of words, periods, and CFWS in any
order as long as it starts with at least one word. If anything other than
words is detected, an ObsoleteHeaderDefect is added to the token's defect
list. We also accept a phrase that starts with CFWS followed by a dot;
this is registered as an InvalidHeaderDefect, since it is not supported by
even the obsolete grammar.
z phrase does not start with wordr r zperiod in 'phrase'rj Nzcomment found without atom) rF r� rS r r� r r� � PHRASE_ENDSr� �ObsoleteHeaderDefectr� r� )r rG r. r r r �
get_phraseI s.
r� c C st t � }d}| d tkr"t| �\}} | s6tjdj| ���yt| �\}} W n^ tjk
r� yt| �\}} W n6 tjk
r� | d dkr�| d tkr�� t � }Y nX Y nX |dk r�|g|dd�< |j
|� | o�| d dks�| d tk�r2t t |�| �\}} |j
dk�r|jj
tjd�� n|jj
tjd�� ||d< y|jjd� W n( tk
�rj |jj
tjd �� Y nX || fS )
z= local-part = dot-atom / quoted-string / obs-local-part
Nr z"expected local-part but found '{}'r zinvalid-obs-local-partz<local-part is not dot-atom, quoted-string, or obs-local-partz,local-part is not a dot-atom (contains CFWS)�asciiz)local-part contains non-ASCII characters))r� r� r� r r� r# r� r� r� r rS �get_obs_local_partr r7 r r� r� r �encoder� ZNonASCIILocalPartDefect)r rm r� r. �obs_local_partr r r �get_local_parto sB
r� c C s� t � }d}�x | o(| d dks,| d tk�r*| d dkrl|rN|jjtjd�� |jt� d}| dd� } qnD| d dkr�|jt| d d �� | dd� } |jjtjd
�� d}q|r�|d jd kr�|jjtjd �� yt | �\}} d}W n4 tj
k
�r | d t k�r � t | �\}} Y nX |j|� qW |d jd k�s\|d jd
k�rn|d jd k�rn|jjtjd�� |d jd k�s�|d jd
k�r�|d jd k�r�|jjtjd�� |j�r�d|_|| fS )z' obs-local-part = word *("." word)
Fr r r zinvalid repeated '.'Trj Nzmisplaced-specialz/'\' character outside of quoted-string/ccontentr� zmissing '.' between wordsrJ z!Invalid leading '.' in local partrh z"Invalid trailing '.' in local partzinvalid-obs-local-partrl rl rl r� )
r� r� r rS r r� r� r� r7 r� r� r� r� )r r� Zlast_non_ws_was_dotr. r r r r� � sV "
r� c C s@ t | d�\}} }t|d�}|r0|jjtjd�� t|� || fS )a dtext = <printable ascii except \ [ ]> / obs-dtext
obs-dtext = obs-NO-WS-CTL / quoted-pair
We allow anything except the excluded characters, but if we find any
ASCII other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Quoted pairs are converted to their
unquoted values, so what is returned is a ptext token, in this case a
ValueTerminal. If there were quoted-printables, an ObsoleteHeaderDefect is
added to the returned token's defect list.
z[]r� z(quoted printable found in domain-literal)r� r� r rS r r� r� )r r� r� r r r � get_dtext� s
r c C s, | rdS |j tjd�� |j tdd�� dS )NFz"end of input inside domain-literalr� zdomain-literal-endT)rS r r� r� )r �domain_literalr r r �_check_for_early_dl_end� s r c C sl t � }| d tkr(t| �\}} |j|� | s6tjd��| d dkrRtjdj| ���| dd� } t| |�rp|| fS |jtdd�� | d t kr�t
| �\}} |j|� t | �\}} |j|� t| |�r�|| fS | d t kr�t
| �\}} |j|� t| |��r || fS | d dk�r tjd j| ���|jtdd
�� | dd� } | �rd| d tk�rdt| �\}} |j|� || fS ) zB domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
r zexpected domain-literal�[z6expected '[' at start of domain-literal but found '{}'rj Nzdomain-literal-startr� z4expected ']' at end of domain-literal but found '{}'zdomain-literal-end) r� r� r� rS r r� r# r r� r� r� r )r r r. r r r �get_domain_literal� sD
r c C st t � }d}| d tkr"t| �\}} | s6tjdj| ���| d dkrvt| �\}} |dk rd|g|dd�< |j|� || fS yt| �\}} W n" tjk
r� t | �\}} Y nX | r�| d dkr�tjd��|dk r�|g|dd�< |j|� | o�| d dk�rl|j
jtj d�� |d j d k�r(|d |dd�< xB| �rj| d dk�rj|jt
� t | d
d� �\}} |j|� �q*W || fS ) z] domain = dot-atom / domain-literal / obs-domain
obs-domain = atom *("." atom))
Nr z expected domain but found '{}'r r~ zInvalid Domainr z(domain is not a dot-atom (contains CFWS)zdot-atomrj )rv r� r� r r� r# r rS r� r� r r� r7 r� )r rn r� r. r r r �
get_domain s@
r c C s~ t � }t| �\}} |j|� | s.| d dkrH|jjtjd�� || fS |jtdd�� t| dd� �\}} |j|� || fS )z( addr-spec = local-part "@" domain
r r~ z"add-spec local part with no domainzaddress-at-symbolrj N)rz r� rS r r r� r� r )r rp r. r r r �
get_addr_spec. s
r c C s� t � }xf| rl| d dks$| d tkrl| d tkrHt| �\}} |j|� q| d dkr|jt� | dd� } qW | s�| d dkr�tjdj| ���|jt� t | dd� �\}} |j|� x�| o�| d dk�rB|jt� | dd� } | s�P | d tk�r t| �\}} |j|� | d dkr�|jt� t | dd� �\}} |j|� q�W | �sTtjd��| d dk�rrtjd j| ���|jt
dd
�� || dd� fS ) z� obs-route = obs-domain-list ":"
obs-domain-list = *(CFWS / ",") "@" domain *("," [CFWS] ["@" domain])
Returns an obs-route token with the appropriate sub-tokens (that is,
there is no obs-domain-list in the parse tree).
r r� rj Nr~ z(expected obs-route domain but found '{}'z%end of header while parsing obs-route�:z4expected ':' marking end of obs-route but found '{}'zend-of-obs-route-marker) rs r� r� rS �
ListSeparatorr r� r# �RouteComponentMarkerr r� )r Z obs_router. r r r �
get_obs_route> sB
r
c C s� t � }| d tkr(t| �\}} |j|� | s:| d dkrJtjdj| ���|jtdd�� | dd� } | d dkr�|jtdd�� |jjtj d �� | dd� } || fS yt
| �\}} W nz tjk
�r2 y"t | �\}} |jjtj d
�� W n( tjk
�r tjd j| ���Y nX |j|� t
| �\}} Y nX |j|� | �r`| d dk�r`| dd� } n|jjtj d �� |jtdd�� | �r�| d tk�r�t| �\}} |j|� || fS )
z� angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
obs-angle-addr = [CFWS] "<" obs-route addr-spec ">" [CFWS]
r �<z"expected angle-addr but found '{}'zangle-addr-startrj N�>zangle-addr-endz null addr-spec in angle-addrz*obsolete route specification in angle-addrz.expected addr-spec or obs-route but found '{}'z"missing trailing '>' on angle-addr)
rq r� r� rS r r� r# r� r r� r r
r� )r Z
angle_addrr. r r r �get_angle_addrg sJ
r
c C s< t � }t| �\}} |j|dd� � |jdd� |_|| fS )z� display-name = phrase
Because this is simply a name-rule, we don't return a display-name
token containing a phrase, but rather a display-name token with
the content of the phrase.
N)r� r� r, r )r rb r. r r r �get_display_name� s
r c C s� t � }d}| d tkr6t| �\}} | s6tjdj|���| d dkr�| d tkr^tjdj| ���t| �\}} | s~tjdj|���|dk r�|g|d dd�< d}|j|� t | �\}} |dk r�|g|dd�< |j|� || fS )z, name-addr = [display-name] angle-addr
Nr z!expected name-addr but found '{}'r )
ri r� r� r r� r# r� r rS r
)r Z name_addrr� r. r r r �
get_name_addr� s0
r c C s� t � }yt| �\}} W nN tjk
rd yt| �\}} W n& tjk
r^ tjdj| ���Y nX Y nX tdd� |jD ��r�d|_|j |� || fS )z& mailbox = name-addr / addr-spec
z expected mailbox but found '{}'c s s | ]}t |tj�V qd S )N)r� r r� )r r r r r r � s z get_mailbox.<locals>.<genexpr>zinvalid-mailbox)
rt r r r� r r# �anyr& r7 rS )r rc r. r r r � get_mailbox� s
r c C sh t � }xX| r^| d |kr^| d tkrF|jt| d d�� | dd� } qt| �\}} |j|� qW || fS )z� Read everything up to one of the chars in endchars.
This is outside the formal grammar. The InvalidMailbox TokenList that is
returned acts like a Mailbox, but the data attributes are None.
r zmisplaced-specialrj N)ru r� rS r� r� )r r� Zinvalid_mailboxr. r r r �get_invalid_mailbox� s r c C s� t � }�x�| o| d dk�r�y t| �\}} |j|� W �n tjk
�r@ d}| d tkr�t| �\}} | sz| d dkr�|j|� |jjtjd�� n@t | d�\}} |dk r�|g|dd�< |j|� |jjtj
d�� nb| d dkr�|jjtjd�� nBt | d�\}} |dk �r |g|dd�< |j|� |jjtj
d�� Y nX | �r�| d dk�r�|d
}d |_ t | d�\}} |j |� |jjtj
d�� | r
| d dkr
|jt
� | dd� } q
W || fS ) aJ mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
obs-mbox-list = *([CFWS] ",") mailbox *("," [mailbox / CFWS])
For this routine we go outside the formal grammar in order to improve error
handling. We recognize the end of the mailbox list only at the end of the
value or at a ';' (the group terminator). This is so that we can turn
invalid mailboxes into InvalidMailbox tokens and continue parsing any
remaining valid mailboxes. We also allow all mailbox entries to be null,
and this condition is handled appropriately at a higher level.
r �;Nz,;z empty element in mailbox-listz invalid mailbox in mailbox-listr� rj zinvalid-mailboxrl )rd r rS r r� r� r� r r� r r� r7 r, r )r Z mailbox_listr. r� rc r r r �get_mailbox_list� sN
r c C s t � }| s$|jjtjd�� || fS d}| r�| d tkr�t| �\}} | sl|jjtjd�� |j|� || fS | d dkr�|j|� || fS t| �\}} t|j �dkr�|dk r�|j|� |j
|� |jjtj d�� || fS |dk r�|g|dd�< |j|� || fS )zg group-list = mailbox-list / CFWS / obs-group-list
obs-group-list = 1*([CFWS] ",") [CFWS]
z end of header before group-listNr zend of header in group-listr z group-list with empty entries) rf r rS r r� r� r� r rk r_ r, r� )r Z
group_listr� r. r r r �get_group_list" s8
r c C s" t � }t| �\}} | s$| d dkr4tjdj| ���|j|� |jtdd�� | dd� } | r�| d dkr�|jtdd�� || dd� fS t| �\}} |j|� | s�|jjtj d �� n | d dkr�tjd
j| ���|jtdd�� | dd� } | �r| d t
k�rt | �\}} |j|� || fS ) z7 group = display-name ":" [group-list] ";" [CFWS]
r r z8expected ':' at end of group display name but found '{}'z group-display-name-terminatorrj Nr zgroup-terminatorzend of header in groupz)expected ';' at end of group but found {}) rg r r r� r# rS r� r r r� r� r� )r ra r. r r r � get_groupG s2
r c C sx t � }yt| �\}} W nN tjk
rd yt| �\}} W n& tjk
r^ tjdj| ���Y nX Y nX |j|� || fS )a� address = mailbox / group
Note that counter-intuitively, an address can be either a single address or
a list of addresses (a group). This is why the returned Address object has
a 'mailboxes' attribute which treats a single address as a list of length
one. When you need to differentiate between to two cases, extract the single
element, which is either a mailbox or a group token.
z expected address but found '{}')r` r r r� r r# rS )r r\ r. r r r � get_addresse s
r c C s� t � }�x�| �r�y t| �\}} |j|� W �n$ tjk
�rP } �zd}| d tkr�t| �\}} | sr| d dkr�|j|� |jjtjd�� nFt | d�\}} |dk r�|g|dd�< |jt
|g�� |jjtj d�� nh| d dkr�|jjtjd�� nHt | d�\}} |dk �r |g|dd�< |jt
|g�� |jjtj d�� W Y dd}~X nX | �r�| d dk�r�|d
d }d|_ t | d�\}} |j
|� |jjtj d�� | r
|jtdd �� | dd� } q
W || fS ) a� address_list = (address *("," address)) / obs-addr-list
obs-addr-list = *([CFWS] ",") address *("," [address / CFWS])
We depart from the formal grammar here by continuing to parse until the end
of the input, assuming the input to be entirely composed of an
address-list. This is always true in email parsing, and allows us
to skip invalid addresses to parse additional valid ones.
Nr r� z"address-list entry with no contentz invalid address in address-listz empty element in address-listrj zinvalid-mailboxzlist-separatorrl )r[ r rS r r� r� r� r r� r r` r� r7 r, r� )r Z address_listr. �errr� rc r r r �get_address_list� sN
r c C s� t � }| s |jjtjd�� |S | d tkrXt| �\}} |j|� | sX|jjtjd�� d}x8| r�| d dkr�| d tkr�|| d 7 }| dd� } q^W |j� s�|jjtjdj |��� |jt
|d �� nt |�|_ |jt
|d
�� | o�| d tk�r
t| �\}} |j|� | �s | d dk�rX|j dk �r>|jjtjd �� | �rT|jt
| d �� |S |jt
dd �� | dd� } | �r�| d tk�r�t| �\}} |j|� | �s�|j dk �r�|jjtjd �� |S d}x2| �r�| d tk�r�|| d 7 }| dd� } �q�W |j� �s2|jjtjd
j |��� |jt
|d �� nt |�|_
|jt
|d
�� | �rv| d tk�rvt| �\}} |j|� | �r�|jjtjd�� |jt
| d �� |S )zE mime-version = [CFWS] 1*digit [CFWS] "." [CFWS] 1*digit [CFWS]
z%Missing MIME version number (eg: 1.0)r z0Expected MIME version number but found only CFWSr r rj Nz1Expected MIME major version number but found {!r}r� �digitsz0Incomplete MIME version; found only major numberzversion-separatorz1Expected MIME minor version number but found {!r}z'Excess non-CFWS text after MIME version)r� r rS r �HeaderMissingRequiredValuer� r� �isdigitr� r# r� �intr� r� )r Z mime_versionr. r r r r �parse_mime_version� sv
r c C sh t � }xX| r^| d dkr^| d tkrF|jt| d d�� | dd� } qt| �\}} |j|� qW || fS )z� Read everything up to the next ';'.
This is outside the formal grammar. The InvalidParameter TokenList that is
returned acts like a Parameter, but the data attributes are None.
r r zmisplaced-specialrj N)r� r� rS r� r� )r Zinvalid_parameterr. r r r �get_invalid_parameter s r c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )a8 ttext = <matches _ttext_matcher>
We allow any non-TOKEN_ENDS in ttext, but add defects to the token's
defects list if we find non-ttext characters. We also register defects for
*any* non-printables even though the RFC doesn't exclude all of them,
because we follow the spirit of RFC 5322.
z expected ttext but found '{}'N�ttext)�_non_token_end_matcherr r� r# ra rk r� r� )r r� r r r r � get_ttext s
r" c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )z�token = [CFWS] 1*ttext [CFWS]
The RFC equivalent of ttext is any US-ASCII chars except space, ctls, or
tspecials. We also exclude tabs even though the RFC doesn't.
The RFC implies the CFWS but is not explicit about it in the BNF.
r z expected token but found '{}') rM r� r� rS �
TOKEN_ENDSr r� r# r" )r Zmtokenr. r r r � get_token) s
r$ c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )aQ attrtext = 1*(any non-ATTRIBUTE_ENDS character)
We allow any non-ATTRIBUTE_ENDS in attrtext, but add defects to the
token's defects list if we find non-attrtext characters. We also register
defects for *any* non-printables even though the RFC doesn't exclude all of
them, because we follow the spirit of RFC 5322.
z expected attrtext but found {!r}Nr� )�_non_attribute_end_matcherr r� r# ra rk r� r� )r r� r� r r r � get_attrtext@ s
r& c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )aH [CFWS] 1*attrtext [CFWS]
This version of the BNF makes the CFWS explicit, and as usual we use a
value terminal for the actual run of characters. The RFC equivalent of
attrtext is the token characters, with the subtraction of '*', "'", and '%'.
We include tab in the excluded set just as we do for token.
r z expected token but found '{}') r� r� r� rS �ATTRIBUTE_ENDSr r� r# r& )r r� r. r r r �
get_attributeS s
r( c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )z�attrtext = 1*(any non-ATTRIBUTE_ENDS character plus '%')
This is a special parsing routine so that we get a value that
includes % escapes as a single string (which we decode as a single
string later).
z)expected extended attrtext but found {!r}Nzextended-attrtext)�#_non_extended_attribute_end_matcherr r� r# ra rk r� r� )r r� r� r r r �get_extended_attrtextj s
r* c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )z� [CFWS] 1*extended_attrtext [CFWS]
This is like the non-extended version except we allow % characters, so that
we can pick up an encoded value as a single string.
r z expected token but found '{}') r� r� r� rS �EXTENDED_ATTRIBUTE_ENDSr r� r# r* )r r� r. r r r �get_extended_attribute| s
r, c C s� t � }| s| d dkr(tjdj| ���|jtdd�� | dd� } | sX| d j� rhtjdj| ���d}x,| r�| d j� r�|| d 7 }| dd� } qnW |d d kr�|d kr�|jjtjd
�� t |�|_
|jt|d �� || fS ) a6 '*' digits
The formal BNF is more complicated because leading 0s are not allowed. We
check for that and add a defect. We also assume no CFWS is allowed between
the '*' and the digits, though the RFC is not crystal clear on that.
The caller should already have dealt with leading CFWS.
r �*z Expected section but found {}zsection-markerrj Nz$Expected section number but found {}r �0z'section number has an invalid leading 0r ) r� r r� r# rS r� r r ZInvalidHeaderErrorr r� )r r� r r r r � get_section� s&
r/ c C s� t � }| stjd��d}| d tkr0t| �\}} | sDtjdj|���| d dkr^t| �\}} n t| �\}} |dk r�|g|dd�< |j|� || fS )z quoted-string / attribute
z&Expected value but found end of stringNr z Expected value but found only {}r
) r� r r� r� r� r# r� r, rS )r �vr� r. r r r � get_value� s
r1 c C sv t � }t| �\}} |j|� | s.| d dkrN|jjtjdj|��� || fS | d dkr�y t| �\}} d|_|j|� W n tj k
r� Y nX | s�tj d��| d dkr�|jt
dd�� | dd � } d|_ | d d
kr�tj d ��|jt
d
d �� | dd � } d }| �r.| d t k�r.t
| �\}} |j|� d }|}|j �rH| �rH| d d
k�rHt| �\}}|j}d}|jdk�r�|�r�|d dk�r�d}n$t|�\}} | �r�| d dk�r�d}n(yt|�\}} W n Y n X | �s�d}|�r2|jjtjd�� |j|� x,|D ]$}
|
jdk�rg |
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The CFWS is implied by the RFC but not made explicit in the BNF. This
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raised if it is not.
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address that is not in a group, which is convenient when manipulating
lists that are a combination of Groups and individual Addresses. In
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parse tree obtained from parsing the header, and 'decoded', set to the
string value of the idealized representation of the data from the value.
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representations are so represented.)
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errors.
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class with the remaining arguments and keywords.
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c C sZ d| _ d| _d| _d| _| j| j | _| j | j | j | _| jjdd�| _|| _g | _ dS )z�Initialize a new instance.
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rQ NFr r �>�@Tr )rD r? rL r' � getdomainrU )rF Z expectrouteZadlistr r r rV ? s. zAddrlistClass.getrouteaddrc C s\ g }| j � x�| jt| j�k r�d}| j| j dkrj|rL|d j� rL|j� |jd� | jd7 _d}nf| j| j dkr�|jdt| j� � � n>| j| j | j kr�|r�|d j� r�|j� P n|j| j
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z ParameterizedHeaderValue.paramsN)r$ r9 r: r; r= r� r r r r r� s r� c @ s e Zd ZdZdZdZdZdS )� ContentTypez content-typeF�textZplainN)r$ r9 r: r7 r) �maintype�subtyper r r r r� - s r� c @ s e Zd ZdZdZdZdS )�ContentDispositionzcontent-dispositionFN)r$ r9 r: r7 r) �content_dispositionr r r r r� 5 s r� c @ s e Zd ZdZdZdZdS )�ContentTransferEncodingzcontent-transfer-encodingFZ7bitN)r$ r9 r: r7 r) rO r r r r r� < s r� c @ s e Zd ZdZdZdS )� HeaderLabelz header-labelFN)r$ r9 r: r7 r) r r r r r� C s r� c @ s e Zd ZdZdS )�Header�headerN)r$ r9 r: r7 r r r r r� I s r� c sr e Zd ZdZdZdZ� fdd�Z� fdd�Zdd� Ze dd � �Z
d� fd d � Z d
d� Z e dd� �Z
dd� Z� ZS )�TerminalTc s t � j| |�}||_g |_|S )N)r �__new__r7 r )�clsr r7 r )r r r r� X s zTerminal.__new__c s dj | jjt� j� �S )Nz{}({}))r# r r$ r r% )r )r r r r% ^ s zTerminal.__repr__c C s t | jjd | j � d S )N�/)r3 r r$ r7 )r r r r r5 a s zTerminal.pprintc C s
t | j�S )N)�listr )r r r r r& d s zTerminal.all_defectsr c s2 dj || jj| jt� j� | js"dn
dj | j��gS )Nz
{}{}/{}({}){}r z {})r# r r$ r7 r r% r )r r2 )r r r r6 h s z Terminal._ppc C s d S )Nr )r r r r �pop_trailing_wsq s zTerminal.pop_trailing_wsc C s g S )Nr )r r r r r- u s zTerminal.commentsc C s t | �| jfS )N)r r7 )r r r r �__getnewargs__y s zTerminal.__getnewargs__)r )r$ r9 r: r) r< r; r� r% r5 r= r& r6 r� r- r� r> r r )r r r� R s r� c @ s e Zd Zedd� �Zdd� ZdS )�WhiteSpaceTerminalc C s dS )Nr@ r )r r r r r s zWhiteSpaceTerminal.valuec C s dS )NTr )r r r r r( � s z!WhiteSpaceTerminal.startswith_fwsN)r$ r9 r: r= r r( r r r r r� } s r� c @ s e Zd Zedd� �Zdd� ZdS )�
ValueTerminalc C s | S )Nr )r r r r r � s zValueTerminal.valuec C s dS )NFr )r r r r r( � s z ValueTerminal.startswith_fwsN)r$ r9 r: r= r r( r r r r r� � s r� c @ s e Zd Zedd� �Zdd� ZdS )�EWWhiteSpaceTerminalc C s dS )Nr r )r r r r r � s zEWWhiteSpaceTerminal.valuec C s dS )Nr r )r r r r r" � s z EWWhiteSpaceTerminal.__str__N)r$ r9 r: r= r r" r r r r r� � s r� r� �,zlist-separatorr~ zroute-component-markerz([{}]+)r z[^{}]+r z\\�]z\]z[\x00-\x20\x7F]c C s> t | �}|r | jjtj|�� tj| �r:| jjtjd�� d S )Nz*Non-ASCII characters found in header token)�_non_printable_finderr rS r ZNonPrintableDefectr r� r� )�xtextZnon_printablesr r r �_validate_xtext� s
r� c C s� t | d�^}}g }d}d}xbtt|��D ]J}|| dkrL|rFd}d}nd}q(|rVd}n|| |krdP |j|| � q(W |d }dj|�dj||d � g| �|fS )Nrj Fr Tr )�
_wsp_splitter�rangerk rS r! )r �endcharsZfragment� remainderZvchars�escape�had_qp�posr r r �_get_ptext_to_endchars� s$ r� c C s. | j � }t| d t| �t|� � d�}||fS )N�fws)r} r� rk )r Znewvaluer� r r r �get_fws� s r� c
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}|j
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| � dj|�}�q6W || fS ) Nz=?z"expected encoded word but found {}rh z?=rj r r z whitespace inside encoded wordz!encoded word format invalid: '{}'�vtext)rN �
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| jd�r�yt| �\}} W n tjk
rd Y nrX d}t|�dkr�|d j dkr�|j
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W |S )Nr z=?Trj r� z&missing whitespace before encoded wordFrh z encoded-wordr� r rl ���rl rl )rD r� r� rS r� r� r r� rk r7 r r� r� r� r� r� r! )r rE r. Zhave_wsr� r� r� r r r �get_unstructured! s:
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r� c C s* t | d�\}} }t|d�}t|� || fS )Nr
r� )r� r� r� )r r� r� r r r � get_qcontentj s
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r� c C s | d dkr t jdj| ���t� }| dd � } | d dkrPt| �\}} |j|� x�| r�| d dkr�| d tkr|t| �\}} nd| d d� dkr�y"t| �\}} |j jt j
d�� W q� t jk
r� t| �\}} Y q�X n t| �\}} |j|� qRW | �s|j jt j
d�� || fS || dd � fS ) Nr r
zexpected '"' but found '{}'rj rh z=?z!encoded word inside quoted stringz"end of header inside quoted string) r r� r# rW r� rS r� r� r� r r� )r Zbare_quoted_stringr. r r r �get_bare_quoted_string� s2
r� c C s� | r | d dkr t jdj| ���t� }| dd � } x^| r�| d dkr�| d tkr^t| �\}} n&| d dkrxt| �\}} n t| �\}} |j|� q4W | s�|j jt j
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r� c C sT t � }xD| rJ| d tkrJ| d tkr2t| �\}} n t| �\}} |j|� qW || fS )Nr )rI � CFWS_LEADERr� r� r� rS )r rJ r. r r r �get_cfws� s r� c C sp t � }| r,| d tkr,t| �\}} |j|� t| �\}} |j|� | rh| d tkrht| �\}} |j|� || fS )Nr )rR r� r� rS r� )r Z
quoted_stringr. r r r �get_quoted_string� s
r� c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���| jd�r�yt | �\}} W q� tjk
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| �\}} Y q�X n t
| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )Nr z expected atom but found '{}'z=?) rK r� r� rS � ATOM_ENDSr r� r# r� r� r� )r rL r. r r r �get_atom� s$
r� c C s� t � }| s| d tkr(tjdj| ���xP| rx| d tkrxt| �\}} |j|� | r*| d dkr*|jt� | dd � } q*W |d tkr�tjdjd| ���|| fS )Nr z8expected atom at a start of dot-atom-text but found '{}'r rj z4expected atom at end of dot-atom-text but found '{}'rl )ry r� r r� r# r� rS r� )r Z
dot_atom_textr. r r r �get_dot_atom_text� s
r� c C s� t � }| d tkr(t| �\}} |j|� | jd�rhyt| �\}} W qt tjk
rd t| �\}} Y qtX n t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )Nr z=?) rx r� r� rS r� r� r r� r� )r Zdot_atomr. r r r � get_dot_atom s
r� c C s� | d t krt| �\}} nd }| d dkr8t| �\}} n*| d tkrVtjdj| ���n t| �\}} |d k rx|g|d d�< || fS )Nr r
z1Expected 'atom' or 'quoted-string' but found '{}')r� r� r� �SPECIALSr r� r# r� )r �leaderr. r r r �get_word* s
r� c C s� t � }yt| �\}} |j|� W n( tjk
rH |jjtjd�� Y nX x�| r�| d tkr�| d dkr�|jt� |jjtj d�� | dd � } qLyt| �\}} W nD tjk
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r� c C st t � }d }| d tkr"t| �\}} | s6tjdj| ���yt| �\}} W n^ tjk
r� yt| �\}} W n6 tjk
r� | d dkr�| d tkr�� t � }Y nX Y nX |d k r�|g|d d�< |j
|� | o�| d dks�| d tk�r2t t |�| �\}} |j
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tjd�� ||d< y|jjd� W n( tk
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tjd�� Y nX || fS ) Nr z"expected local-part but found '{}'r zinvalid-obs-local-partz<local-part is not dot-atom, quoted-string, or obs-local-partz,local-part is not a dot-atom (contains CFWS)�asciiz)local-part contains non-ASCII characters))r� r� r� r r� r# r� r� r� r rS �get_obs_local_partr r7 r r� r� r �encoder� ZNonASCIILocalPartDefect)r rm r� r. �obs_local_partr r r �get_local_parto sB
r� c C s� t � }d}�x | o(| d dks,| d tk�r*| d dkrl|rN|jjtjd�� |jt� d}| dd � } qnD| d dkr�|jt| d d�� | dd � } |jjtjd �� d}q|r�|d jd
kr�|jjtjd �� yt | �\}} d}W n4 tj
k
�r | d t k�r � t | �\}} Y nX |j|� qW |d jd
k�s\|d jd k�rn|d jd
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�� |d jd
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k�r�|jjtjd�� |j�r�d|_|| fS )NFr r r zinvalid repeated '.'Trj zmisplaced-specialz/'\' character outside of quoted-string/ccontentr� zmissing '.' between wordsrJ z!Invalid leading '.' in local partrh z"Invalid trailing '.' in local partzinvalid-obs-local-partrl rl rl r� )
r� r� r rS r r� r� r� r7 r� r� r� r� )r r� Zlast_non_ws_was_dotr. r r r r� � sV "
r� c C s@ t | d�\}} }t|d�}|r0|jjtjd�� t|� || fS )Nz[]r� z(quoted printable found in domain-literal)r� r� r rS r r� r� )r r� r� r r r � get_dtext� s
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| �\}} |j|� t | �\}} |j|� t| |�r�|| fS | d t kr�t
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Nr zexpected domain-literal�[z6expected '[' at start of domain-literal but found '{}'rj zdomain-literal-startr� z4expected ']' at end of domain-literal but found '{}'zdomain-literal-end) r� r� r� rS r r� r# r r� r� r� r )r r r. r r r �get_domain_literal� sD
r c C st t � }d }| d tkr"t| �\}} | s6tjdj| ���| d dkrvt| �\}} |d k rd|g|d d�< |j|� || fS yt| �\}} W n" tjk
r� t | �\}} Y nX | r�| d dkr�tjd��|d k r�|g|d d�< |j|� | o�| d dk�rl|j
jtj d�� |d j dk�r(|d |d d �< xB| �rj| d dk�rj|jt
� t | d d � �\}} |j|� �q*W || fS )
Nr z expected domain but found '{}'r r~ zInvalid Domainr z(domain is not a dot-atom (contains CFWS)zdot-atomrj )rv r� r� r r� r# r rS r� r� r r� r7 r� )r rn r� r. r r r �
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r c C s~ t � }t| �\}} |j|� | s.| d dkrH|jjtjd�� || fS |jtdd�� t| dd � �\}} |j|� || fS )Nr r~ z"add-spec local part with no domainzaddress-at-symbolrj )rz r� rS r r r� r� r )r rp r. r r r �
get_addr_spec. s
r c C s� t � }xf| rl| d dks$| d tkrl| d tkrHt| �\}} |j|� q| d dkr|jt� | dd � } qW | s�| d dkr�tjdj| ���|jt� t | dd � �\}} |j|� x�| o�| d dk�rB|jt� | dd � } | s�P | d tk�r t| �\}} |j|� | d dkr�|jt� t | dd � �\}} |j|� q�W | �sTtjd��| d dk�rrtjdj| ���|jt
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Nr r� rj r~ z(expected obs-route domain but found '{}'z%end of header while parsing obs-route�:z4expected ':' marking end of obs-route but found '{}'zend-of-obs-route-marker) rs r� r� rS �
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get_obs_route> sB
r
c C s� t � }| d tkr(t| �\}} |j|� | s:| d dkrJtjdj| ���|jtdd�� | dd � } | d dkr�|jtdd�� |jjtj d�� | dd � } || fS yt
| �\}} W nz tjk
�r2 y"t | �\}} |jjtj d �� W n( tjk
�r tjd
j| ���Y nX |j|� t
| �\}} Y nX |j|� | �r`| d dk�r`| dd � } n|jjtj d �� |jtdd�� | �r�| d tk�r�t| �\}} |j|� || fS ) Nr �<z"expected angle-addr but found '{}'zangle-addr-startrj �>zangle-addr-endz null addr-spec in angle-addrz*obsolete route specification in angle-addrz.expected addr-spec or obs-route but found '{}'z"missing trailing '>' on angle-addr)
rq r� r� rS r r� r# r� r r� r r
r� )r Z
angle_addrr. r r r �get_angle_addrg sJ
r
c C s< t � }t| �\}} |j|d d � � |jd d � |_|| fS )N)r� r� r, r )r rb r. r r r �get_display_name� s
r c C s� t � }d }| d tkr6t| �\}} | s6tjdj|���| d dkr�| d tkr^tjdj| ���t| �\}} | s~tjdj|���|d k r�|g|d d d�< d }|j|� t | �\}} |d k r�|g|d d�< |j|� || fS )Nr z!expected name-addr but found '{}'r )
ri r� r� r r� r# r� r rS r
)r Z name_addrr� r. r r r �
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r c C s� t � }yt| �\}} W nN tjk
rd yt| �\}} W n& tjk
r^ tjdj| ���Y nX Y nX tdd� |jD ��r�d|_|j |� || fS )Nz expected mailbox but found '{}'c s s | ]}t |tj�V qd S )N)r� r r� )r r r r r r � s z get_mailbox.<locals>.<genexpr>zinvalid-mailbox)
rt r r r� r r# �anyr& r7 rS )r rc r. r r r � get_mailbox� s
r c C sh t � }xX| r^| d |kr^| d tkrF|jt| d d�� | dd � } qt| �\}} |j|� qW || fS )Nr zmisplaced-specialrj )ru r� rS r� r� )r r� Zinvalid_mailboxr. r r r �get_invalid_mailbox� s r c C s� t � }�x�| o| d dk�r�y t| �\}} |j|� W �n tjk
�r@ d }| d tkr�t| �\}} | sz| d dkr�|j|� |jjtjd�� n@t | d�\}} |d k r�|g|d d�< |j|� |jjtj
d�� nb| d dkr�|jjtjd�� nBt | d�\}} |d k �r |g|d d�< |j|� |jjtj
d�� Y nX | �r�| d dk�r�|d }d|_ t | d�\}} |j |� |jjtj
d�� | r
| d dkr
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W || fS )
Nr �;z,;z empty element in mailbox-listz invalid mailbox in mailbox-listr� rj zinvalid-mailboxrl )rd r rS r r� r� r� r r� r r� r7 r, r )r Z mailbox_listr. r� rc r r r �get_mailbox_list� sN
r c C s t � }| s$|jjtjd�� || fS d }| r�| d tkr�t| �\}} | sl|jjtjd�� |j|� || fS | d dkr�|j|� || fS t| �\}} t|j �dkr�|d k r�|j|� |j
|� |jjtj d�� || fS |d k r�|g|d d�< |j|� || fS )Nz end of header before group-listr zend of header in group-listr z group-list with empty entries) rf r rS r r� r� r� r rk r_ r, r� )r Z
group_listr� r. r r r �get_group_list" s8
r c C s" t � }t| �\}} | s$| d dkr4tjdj| ���|j|� |jtdd�� | dd � } | r�| d dkr�|jtdd�� || dd � fS t| �\}} |j|� | s�|jjtj d�� n | d dkr�tjd j| ���|jtdd�� | dd � } | �r| d t
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Nr r z8expected ':' at end of group display name but found '{}'z group-display-name-terminatorrj r zgroup-terminatorzend of header in groupz)expected ';' at end of group but found {}) rg r r r� r# rS r� r r r� r� r� )r ra r. r r r � get_groupG s2
r c C sx t � }yt| �\}} W nN tjk
rd yt| �\}} W n& tjk
r^ tjdj| ���Y nX Y nX |j|� || fS )Nz expected address but found '{}')r` r r r� r r# rS )r r\ r. r r r � get_addresse s
r c C s� t � }�x�| �r�y t| �\}} |j|� W �n$ tjk
�rP } �zd }| d tkr�t| �\}} | sr| d dkr�|j|� |jjtjd�� nFt | d�\}} |d k r�|g|d d�< |jt
|g�� |jjtj d�� nh| d dkr�|jjtjd�� nHt | d�\}} |d k �r |g|d d�< |jt
|g�� |jjtj d�� W Y d d }~X nX | �r�| d dk�r�|d d }d|_ t | d�\}} |j
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Nr r� z"address-list entry with no contentz invalid address in address-listz empty element in address-listrj zinvalid-mailboxzlist-separatorrl )r[ r rS r r� r� r� r r� r r` r� r7 r, r� )r Z address_listr. �errr� rc r r r �get_address_list� sN
r c C s� t � }| s |jjtjd�� |S | d tkrXt| �\}} |j|� | sX|jjtjd�� d}x8| r�| d dkr�| d tkr�|| d 7 }| dd � } q^W |j� s�|jjtjdj |��� |jt
|d�� nt |�|_ |jt
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t| �\}} |j|� | �s | d dk�rX|j d k �r>|jjtjd
�� | �rT|jt
| d�� |S |jt
dd �� | dd � } | �r�| d tk�r�t| �\}} |j|� | �s�|j d k �r�|jjtjd
�� |S d}x2| �r�| d tk�r�|| d 7 }| dd � } �q�W |j� �s2|jjtjd j |��� |jt
|d�� nt |�|_
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| d�� |S )Nz%Missing MIME version number (eg: 1.0)r z0Expected MIME version number but found only CFWSr r rj z1Expected MIME major version number but found {!r}r� �digitsz0Incomplete MIME version; found only major numberzversion-separatorz1Expected MIME minor version number but found {!r}z'Excess non-CFWS text after MIME version)r� r rS r �HeaderMissingRequiredValuer� r� �isdigitr� r# r� �intr� r� )r Z mime_versionr. r r r r �parse_mime_version� sv
r c C sh t � }xX| r^| d dkr^| d tkrF|jt| d d�� | dd � } qt| �\}} |j|� qW || fS )Nr r zmisplaced-specialrj )r� r� rS r� r� )r Zinvalid_parameterr. r r r �get_invalid_parameter s r c C sN t | �}|s tjdj| ���|j� }| t|�d � } t|d�}t|� || fS )Nz expected ttext but found '{}'�ttext)�_non_token_end_matcherr r� r# ra rk r� r� )r r� r r r r � get_ttext s
r" c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )Nr z expected token but found '{}') rM r� r� rS �
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c C s | j dd�j dd�S )z�Prepare string to be used in a quoted string.
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AddrlistClassa Address parser class by Ben Escoto.
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Use email.utils.AddressList instead.
c C sZ d| _ d| _d| _d| _| j| j | _| j | j | j | _| jjdd�| _|| _g | _ dS )z�Initialize a new instance.
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rQ NFr r �>�@Tr )rD r? rL r' � getdomainrU )rF Z expectrouteZadlistr r r rV ? s. zAddrlistClass.getrouteaddrc C s\ g }| j � x�| jt| j�k r�d}| j| j dkrj|rL|d j� rL|j� |jd� | jd7 _d}nf| j| j dkr�|jdt| j� � � n>| j| j | j kr�|r�|d j� r�|j� P n|j| j
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� � qW tj |�S )z-Get the complete domain name from an address.r rH �[r rY ) r? r' rD r@ rE r) rI �getdomainliteralrJ rB r^ rK )rF Zsdlistr r r rZ � s" zAddrlistClass.getdomainTc C s� | j | j |krdS dg}d}| jd7 _x�| jt| j �k r�|rZ|j| j | j � d}np| j | j |kr|| jd7 _P nN|r�| j | j dkr�|j| j� � q.n(| j | j dkr�d}n|j| j | j � | jd7 _q.W tj|�S )a� Parse a header fragment delimited by special characters.
`beginchar' is the start character for the fragment.
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getdelimited returns the empty string.
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Parsing stops when one of these is encountered.
If `allowcomments' is non-zero, embedded RFC 2822 comments are allowed
within the parsed fragment.
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zAddrlistClass.getdelimitedc C s | j ddd�S )z1Get a quote-delimited fragment from self's field.r: z"
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T)ra )rF r r r rI � s zAddrlistClass.getcommentc C s d| j ddd� S )z!Parse an RFC 2822 domain-literal.z[%s]r_ z]
F)ra )rF r r r r` � s z AddrlistClass.getdomainliteralNc C sh dg}|dkr| j }xH| jt| j�k r\| j| j |kr:P n|j| j| j � | jd7 _qW tj|�S )a Parse an RFC 2822 atom.
Optional atomends specifies a different set of end token delimiters
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The parsing methods defined in this module implement various email related
parsing rules. Principal among them is RFC 5322, which is the followon
to RFC 2822 and primarily a clarification of the former. It also implements
RFC 2047 encoded word decoding.
RFC 5322 goes to considerable trouble to maintain backward compatibility with
RFC 822 in the parse phase, while cleaning up the structure on the generation
phase. This parser supports correct RFC 5322 generation by tagging white space
as folding white space only when folding is allowed in the non-obsolete rule
sets. Actually, the parser is even more generous when accepting input than RFC
5322 mandates, following the spirit of Postel's Law, which RFC 5322 encourages.
Where possible deviations from the standard are annotated on the 'defects'
attribute of tokens that deviate.
The general structure of the parser follows RFC 5322, and uses its terminology
where there is a direct correspondence. Where the implementation requires a
somewhat different structure than that used by the formal grammar, new terms
that mimic the closest existing terms are used. Thus, it really helps to have
a copy of RFC 5322 handy when studying this code.
Input to the parser is a string that has already been unfolded according to
RFC 5322 rules. According to the RFC this unfolding is the very first step, and
this parser leaves the unfolding step to a higher level message parser, which
will have already detected the line breaks that need unfolding while
determining the beginning and end of each header.
The output of the parser is a TokenList object, which is a list subclass. A
TokenList is a recursive data structure. The terminal nodes of the structure
are Terminal objects, which are subclasses of str. These do not correspond
directly to terminal objects in the formal grammar, but are instead more
practical higher level combinations of true terminals.
All TokenList and Terminal objects have a 'value' attribute, which produces the
semantically meaningful value of that part of the parse subtree. The value of
all whitespace tokens (no matter how many sub-tokens they may contain) is a
single space, as per the RFC rules. This includes 'CFWS', which is herein
included in the general class of whitespace tokens. There is one exception to
the rule that whitespace tokens are collapsed into single spaces in values: in
the value of a 'bare-quoted-string' (a quoted-string with no leading or
trailing whitespace), any whitespace that appeared between the quotation marks
is preserved in the returned value. Note that in all Terminal strings quoted
pairs are turned into their unquoted values.
All TokenList and Terminal objects also have a string value, which attempts to
be a "canonical" representation of the RFC-compliant form of the substring that
produced the parsed subtree, including minimal use of quoted pair quoting.
Whitespace runs are not collapsed.
Comment tokens also have a 'content' attribute providing the string found
between the parens (including any nested comments) with whitespace preserved.
All TokenList and Terminal objects have a 'defects' attribute which is a
possibly empty list all of the defects found while creating the token. Defects
may appear on any token in the tree, and a composite list of all defects in the
subtree is available through the 'all_defects' attribute of any node. (For
Terminal notes x.defects == x.all_defects.)
Each object in a parse tree is called a 'token', and each has a 'token_type'
attribute that gives the name from the RFC 5322 grammar that it represents.
Not all RFC 5322 nodes are produced, and there is one non-RFC 5322 node that
may be produced: 'ptext'. A 'ptext' is a string of printable ascii characters.
It is returned in place of lists of (ctext/quoted-pair) and
(qtext/quoted-pair).
XXX: provide complete list of token types.
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group-list)r7 r^ )r r r r r^ m s zGroup.mailboxesc C s | d j dkrg S | d jS )Nrh z
group-list)r7 r_ )r r r r r_ s s zGroup.all_mailboxesc C s
| d j S )Nr )rb )r r r r rb y s zGroup.display_nameN)r$ r9 r: r7 r= r^ r_ rb r r r r rg i s rg c @ sL e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zed
d � �Z d S )
�NameAddrz name-addrc C s t | �dkrd S | d jS )N� r )�lenrb )r r r r rb � s zNameAddr.display_namec C s
| d j S )Nrj ���)�
local_part)r r r r rm � s zNameAddr.local_partc C s
| d j S )Nrj rl )�domain)r r r r rn � s zNameAddr.domainc C s
| d j S )Nrj rl )�route)r r r r ro � s zNameAddr.routec C s
| d j S )Nrj rl )� addr_spec)r r r r rp � s zNameAddr.addr_specN)
r$ r9 r: r7 r= rb rm rn ro rp r r r r ri ~ s ri c @ s@ e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zd
S ) � AngleAddrz
angle-addrc C s" x | D ]}|j dkr|jS qW d S )Nz addr-spec)r7 rm )r r r r r rm � s
zAngleAddr.local_partc C s" x | D ]}|j dkr|jS qW d S )Nz addr-spec)r7 rn )r r r r r rn � s
zAngleAddr.domainc C s" x | D ]}|j dkr|jS qW d S )Nz obs-route)r7 �domains)r r r r r ro � s
zAngleAddr.routec C s< x6| D ]*}|j dkr|jr |jS t|j�|j S qW dS d S )Nz addr-specz<>)r7 rm rp r )r r r r r rp � s
zAngleAddr.addr_specN) r$ r9 r: r7 r= rm rn ro rp r r r r rq � s
rq c @ s e Zd ZdZedd� �ZdS )�ObsRoutez obs-routec C s dd� | D �S )Nc S s g | ]}|j d kr|j�qS )rn )r7 rn )r r r r r rC � s z$ObsRoute.domains.<locals>.<listcomp>r )r r r r rr � s zObsRoute.domainsN)r$ r9 r: r7 r= rr r r r r rs � s rs c @ sL e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zed
d � �Z d S )
�Mailboxrc c C s | d j dkr| d jS d S )Nr z name-addr)r7 rb )r r r r rb � s zMailbox.display_namec C s
| d j S )Nr )rm )r r r r rm � s zMailbox.local_partc C s
| d j S )Nr )rn )r r r r rn � s zMailbox.domainc C s | d j dkr| d jS d S )Nr z name-addr)r7 ro )r r r r ro � s z
Mailbox.routec C s
| d j S )Nr )rp )r r r r rp � s zMailbox.addr_specN)
r$ r9 r: r7 r= rb rm rn ro rp r r r r rt � s rt c @ s, e Zd ZdZedd� �Ze Z Z ZZ dS )�InvalidMailboxzinvalid-mailboxc C s d S )Nr )r r r r rb � s zInvalidMailbox.display_nameN)
r$ r9 r: r7 r= rb rm rn ro rp r r r r ru � s ru c s( e Zd ZdZdZe� fdd��Z� ZS )�Domainrn Fc s dj t� jj� �S )Nr )r! r r �split)r )r r r rn � s z
Domain.domain)r$ r9 r: r7 r) r= rn r> r r )r r rv � s rv c @ s e Zd ZdZdS )�DotAtomzdot-atomN)r$ r9 r: r7 r r r r rx � s rx c @ s e Zd ZdZdZdS )� DotAtomTextz
dot-atom-textTN)r$ r9 r: r7 r) r r r r ry � s ry c @ sD e Zd ZdZdZedd� �Zedd� �Zedd� �Zed d
� �Z d S ) �AddrSpecz addr-specFc C s
| d j S )Nr )rm )r r r r rm s zAddrSpec.local_partc C s t | �dk rd S | d jS )N� rj rl )rk rn )r r r r rn s zAddrSpec.domainc C s< t | �dk r| d jS | d jj� | d j | d jj� S )Nr{ r rj rh )rk r �rstrip�lstrip)r r r r r s
zAddrSpec.valuec C sL t | j�}t|�t|t �kr*t| j�}n| j}| jd k rH|d | j S |S )N�@)�setrm rk �
DOT_ATOM_ENDSr rn )r ZnamesetZlpr r r rp s
zAddrSpec.addr_specN)
r$ r9 r: r7 r) r= rm rn r rp r r r r rz � s rz c @ s e Zd ZdZdZdS )� ObsLocalPartzobs-local-partFN)r$ r9 r: r7 r) r r r r r� s r� c s4 e Zd ZdZdZedd� �Ze� fdd��Z� ZS )� DisplayNamez display-nameFc C s� t | �}|d jdkr"|jd� n*|d d jdkrLt |d dd � �|d< |d jdkrd|j� n*|d d jdkr�t |d d d� �|d < |jS )
Nr rJ rj rl rl rl rl rl rl )r r7 �popr )r rT r r r rb + s
zDisplayName.display_namec s� d}| j rd}n x| D ]}|jdkrd}qW |r�d }}| d jdksX| d d jdkr\d}| d jdks|| d
d jdkr�d}|t| j� | S t� jS d S ) NFTz
quoted-stringr r rJ r@ rj rl rl rl )r r7 r rb r r )r rY r ZpreZpost)r r r r : s
zDisplayName.value) r$ r9 r: r7 r< r= rb r r> r r )r r r� & s r� c @ s, e Zd ZdZdZedd� �Zedd� �ZdS )� LocalPartz
local-partFc C s& | d j dkr| d jS | d jS d S )Nr z
quoted-string)r7 rU r )r r r r r S s
zLocalPart.valuec C s� t g}t }d}x�| d t g D ]�}|jdkr.q |r^|jdkr^|d jdkr^t|d d� �|d< t|t�}|r�|jdkr�|d jdkr�|jt|dd � �� n
|j|� |d }|}q W t|dd
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isinstancerS r )r rT ZlastZ
last_is_tl�tokZis_tlr r r rm Z s$
zLocalPart.local_partN)r$ r9 r: r7 r) r= r rm r r r r r� N s r� c s4 e Zd ZdZdZe� fdd��Zedd� �Z� ZS )�
DomainLiteralzdomain-literalFc s dj t� jj� �S )Nr )r! r r rw )r )r r r rn w s zDomainLiteral.domainc C s" x | D ]}|j dkr|jS qW d S )N�ptext)r7 r )r r r r r �ip{ s
zDomainLiteral.ip) r$ r9 r: r7 r) r= rn r� r> r r )r r r� r s r� c @ s e Zd ZdZdZdZdS )� MIMEVersionz mime-versionN)r$ r9 r: r7 �major�minorr r r r r� � s r� c @ s4 e Zd ZdZdZdZdZedd� �Zedd� �Z dS ) � Parameter� parameterFzus-asciic C s | j r| d jS dS )Nrj r )� sectioned�number)r r r r �section_number� s zParameter.section_numberc C sb x\| D ]T}|j dkr|jS |j dkrx4|D ],}|j dkr*x |D ]}|j dkr>|jS q>W q*W qW dS )Nr z
quoted-stringzbare-quoted-stringr )r7 rV )r r. r r r � param_value� s
zParameter.param_valueN)
r$ r9 r: r7 r� �extendedrP r= r� r� r r r r r� � s r� c @ s e Zd ZdZdS )�InvalidParameterzinvalid-parameterN)r$ r9 r: r7 r r r r r� � s r� c @ s e Zd ZdZedd� �ZdS )� Attribute� attributec C s$ x | D ]}|j jd�r|jS qW d S )N�attrtext)r7 �endswithr )r r. r r r rV � s
zAttribute.stripped_valueN)r$ r9 r: r7 r= rV r r r r r� � s r� c @ s e Zd ZdZdZdS )�Section�sectionN)r$ r9 r: r7 r� r r r r r� � s r� c @ s e Zd ZdZedd� �ZdS )�Valuer c C s2 | d }|j dkr| d }|j jd�r,|jS | jS )Nr rJ rj �
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zValue.stripped_valueN)r$ r9 r: r7 r= rV r r r r r� � s r� c @ s( e Zd ZdZdZedd� �Zdd� ZdS )�MimeParameterszmime-parametersFc c s� t � }x\| D ]T}|jjd�s q |d jdkr.q |d jj� }||krLg ||< || j|j|f� q W �x�|j� D �]�\}}t|t d�d�}|d d }|j
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j|�} || fV qpW d S )Nr� r r� )�keyrj z.duplicate parameter name; duplicate(s) ignoredz+duplicate parameter name; duplicate ignoredz(inconsistent RFC2231 parameter numberingzlatin-1)�encoding�surrogateescapezus-asciir ) r r7 r� r �striprS r� �items�sortedr rP r� rk r r �InvalidHeaderDefectr� �urllib�parseZunquote_to_bytes�UnicodeEncodeErrorZunquote�decode� LookupErrorr �_has_surrogates�UndecodableBytesDefectr! ) r �paramsr. �name�partsZ first_paramrP Z value_parts�ir� �paramr r r r r� � sZ
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zMimeParameters.__str__N)r$ r9 r: r7 r; r= r� r" r r r r r� � s Fr� c @ s e Zd ZdZedd� �ZdS )�ParameterizedHeaderValueFc C s& x t | �D ]}|jdkr
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z ParameterizedHeaderValue.paramsN)r$ r9 r: r; r= r� r r r r r� s r� c @ s e Zd ZdZdZdZdZdS )� ContentTypez content-typeF�textZplainN)r$ r9 r: r7 r) �maintype�subtyper r r r r� - s r� c @ s e Zd ZdZdZdZdS )�ContentDispositionzcontent-dispositionFN)r$ r9 r: r7 r) �content_dispositionr r r r r� 5 s r� c @ s e Zd ZdZdZdZdS )�ContentTransferEncodingzcontent-transfer-encodingFZ7bitN)r$ r9 r: r7 r) rO r r r r r� < s r� c @ s e Zd ZdZdZdS )� HeaderLabelz header-labelFN)r$ r9 r: r7 r) r r r r r� C s r� c @ s e Zd ZdZdS )�Header�headerN)r$ r9 r: r7 r r r r r� I s r� c sr e Zd ZdZdZdZ� fdd�Z� fdd�Zdd� Ze dd � �Z
d� fd d � Z d
d� Z e dd� �Z
dd� Z� ZS )�TerminalTc s t � j| |�}||_g |_|S )N)r �__new__r7 r )�clsr r7 r )r r r r� X s zTerminal.__new__c s dj | jjt� j� �S )Nz{}({}))r# r r$ r r% )r )r r r r% ^ s zTerminal.__repr__c C s t | jjd | j � d S )N�/)r3 r r$ r7 )r r r r r5 a s zTerminal.pprintc C s
t | j�S )N)�listr )r r r r r& d s zTerminal.all_defectsr c s2 dj || jj| jt� j� | js"dn
dj | j��gS )Nz
{}{}/{}({}){}r z {})r# r r$ r7 r r% r )r r2 )r r r r6 h s z Terminal._ppc C s d S )Nr )r r r r �pop_trailing_wsq s zTerminal.pop_trailing_wsc C s g S )Nr )r r r r r- u s zTerminal.commentsc C s t | �| jfS )N)r r7 )r r r r �__getnewargs__y s zTerminal.__getnewargs__)r )r$ r9 r: r) r< r; r� r% r5 r= r& r6 r� r- r� r> r r )r r r� R s r� c @ s e Zd Zedd� �Zdd� ZdS )�WhiteSpaceTerminalc C s dS )Nr@ r )r r r r r s zWhiteSpaceTerminal.valuec C s dS )NTr )r r r r r( � s z!WhiteSpaceTerminal.startswith_fwsN)r$ r9 r: r= r r( r r r r r� } s r� c @ s e Zd Zedd� �Zdd� ZdS )�
ValueTerminalc C s | S )Nr )r r r r r � s zValueTerminal.valuec C s dS )NFr )r r r r r( � s z ValueTerminal.startswith_fwsN)r$ r9 r: r= r r( r r r r r� � s r� c @ s e Zd Zedd� �Zdd� ZdS )�EWWhiteSpaceTerminalc C s dS )Nr r )r r r r r � s zEWWhiteSpaceTerminal.valuec C s dS )Nr r )r r r r r" � s z EWWhiteSpaceTerminal.__str__N)r$ r9 r: r= r r" r r r r r� � s r� r� �,zlist-separatorr~ zroute-component-markerz([{}]+)r z[^{}]+r z\\�]z\]z[\x00-\x20\x7F]c C s> t | �}|r | jjtj|�� tj| �r:| jjtjd�� dS )z@If input token contains ASCII non-printables, register a defect.z*Non-ASCII characters found in header tokenN)�_non_printable_finderr rS r ZNonPrintableDefectr r� r� )�xtextZnon_printablesr r r �_validate_xtext� s
r� c C s� t | d�^}}g }d}d}xbtt|��D ]J}|| dkrL|rFd}d}nd}q(|rVd}n|| |krdP |j|| � q(W |d }dj|�dj||d� g| �|fS )ak Scan printables/quoted-pairs until endchars and return unquoted ptext.
This function turns a run of qcontent, ccontent-without-comments, or
dtext-with-quoted-printables into a single string by unquoting any
quoted printables. It returns the string, the remaining value, and
a flag that is True iff there were any quoted printables decoded.
rj Fr Tr N)�
_wsp_splitter�rangerk rS r! )r �endcharsZfragment� remainderZvchars�escape�had_qp�posr r r �_get_ptext_to_endchars� s$ r� c C s. | j � }t| dt| �t|� � d�}||fS )z�FWS = 1*WSP
This isn't the RFC definition. We're using fws to represent tokens where
folding can be done, but when we are parsing the *un*folding has already
been done so we don't need to watch out for CRLF.
N�fws)r} r� rk )r Znewvaluer� r r r �get_fws� s r� c
C s� t � }| jd�s tjdj| ���| dd� jdd�^}}|| dd� krXtjdj| ���dj|�}t|�dkr�|d tkr�|d tkr�|jdd�^}}|d | }t|j� �dkr�|j j
tj d �� | |_ dj|�} y t
jd| d �\}}}} W n( tk
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j|j ���Y nX ||_||_|j j| � xh|�r�|d tk�rdt|�\}
}|j
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| � dj|�}�q6W || fS ) zE encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
z=?z"expected encoded word but found {}rh Nz?=rj r r z whitespace inside encoded wordz!encoded word format invalid: '{}'�vtext)rN �
startswithr �HeaderParseErrorr# rw r! rk r r rS r� rO �_ewr� �
ValueErrorrP rQ r, �WSPr� r� r� r� )
r �ewr� r� Zremstr�restr� rP rQ r r. �charsr� r r r �get_encoded_word� sH
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r� c C s t � }�x| �r | d tkr4t| �\}} |j|� q
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rd Y nrX d}t|�dkr�|d j dkr�|j
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W |S )aO unstructured = (*([FWS] vchar) *WSP) / obs-unstruct
obs-unstruct = *((*LF *CR *(obs-utext) *LF *CR)) / FWS)
obs-utext = %d0 / obs-NO-WS-CTL / LF / CR
obs-NO-WS-CTL is control characters except WSP/CR/LF.
So, basically, we have printable runs, plus control characters or nulls in
the obsolete syntax, separated by whitespace. Since RFC 2047 uses the
obsolete syntax in its specification, but requires whitespace on either
side of the encoded words, I can see no reason to need to separate the
non-printable-non-whitespace from the printable runs if they occur, so we
parse this into xtext tokens separated by WSP tokens.
Because an 'unstructured' value must by definition constitute the entire
value, this 'get' routine does not return a remaining value, only the
parsed TokenList.
r z=?Trj r� z&missing whitespace before encoded wordFrh z encoded-wordr� r rl ���rl rl )rD r� r� rS r� r� r r� rk r7 r r� r� r� r� r� r! )r rE r. Zhave_wsr� r� r� r r r �get_unstructured! s:
r� c C s* t | d�\}} }t|d�}t|� || fS )a ctext = <printable ascii except \ ( )>
This is not the RFC ctext, since we are handling nested comments in comment
and unquoting quoted-pairs here. We allow anything except the '()'
characters, but if we find any ASCII other than the RFC defined printable
ASCII, a NonPrintableDefect is added to the token's defects list. Since
quoted pairs are converted to their unquoted values, what is returned is
a 'ptext' token. In this case it is a WhiteSpaceTerminal, so it's value
is ' '.
z()r� )r� r� r� )r r� �_r r r � get_qp_ctextY s
r� c C s* t | d�\}} }t|d�}t|� || fS )ao qcontent = qtext / quoted-pair
We allow anything except the DQUOTE character, but if we find any ASCII
other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Any quoted pairs are converted to their
unquoted values, so what is returned is a 'ptext' token. In this case it
is a ValueTerminal.
r
r� )r� r� r� )r r� r� r r r � get_qcontentj s
r� c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )z�atext = <matches _atext_matcher>
We allow any non-ATOM_ENDS in atext, but add an InvalidATextDefect to
the token's defects list if we find non-atext characters.
z expected atext but found '{}'N�atext)�_non_atom_end_matcherr r� r# ra rk r� r� )r �mr� r r r � get_atexty s
r� c C s | d dkr t jdj| ���t� }| dd� } | d dkrPt| �\}} |j|� x�| r�| d dkr�| d tkr|t| �\}} nd| dd� dkr�y"t| �\}} |j jt j
d�� W q� t jk
r� t| �\}} Y q�X n t| �\}} |j|� qRW | �s|j jt j
d �� || fS || dd� fS )
z�bare-quoted-string = DQUOTE *([FWS] qcontent) [FWS] DQUOTE
A quoted-string without the leading or trailing white space. Its
value is the text between the quote marks, with whitespace
preserved and quoted pairs decoded.
r r
zexpected '"' but found '{}'rj Nrh z=?z!encoded word inside quoted stringz"end of header inside quoted string) r r� r# rW r� rS r� r� r� r r� )r Zbare_quoted_stringr. r r r �get_bare_quoted_string� s2
r� c C s� | r | d dkr t jdj| ���t� }| dd� } x^| r�| d dkr�| d tkr^t| �\}} n&| d dkrxt| �\}} n t| �\}} |j|� q4W | s�|j jt j
d�� || fS || dd� fS )z�comment = "(" *([FWS] ccontent) [FWS] ")"
ccontent = ctext / quoted-pair / comment
We handle nested comments here, and quoted-pair in our qp-ctext routine.
r r zexpected '(' but found '{}'rj NrZ z end of header inside comment) r r� r# rX r� r� � get_commentr� rS r r� )r rA r. r r r r� � s"
r� c C sT t � }xD| rJ| d tkrJ| d tkr2t| �\}} n t| �\}} |j|� qW || fS )z,CFWS = (1*([FWS] comment) [FWS]) / FWS
r )rI � CFWS_LEADERr� r� r� rS )r rJ r. r r r �get_cfws� s r� c C sp t � }| r,| d tkr,t| �\}} |j|� t| �\}} |j|� | rh| d tkrht| �\}} |j|� || fS )z�quoted-string = [CFWS] <bare-quoted-string> [CFWS]
'bare-quoted-string' is an intermediate class defined by this
parser and not by the RFC grammar. It is the quoted string
without any attached CFWS.
r )rR r� r� rS r� )r Z
quoted_stringr. r r r �get_quoted_string� s
r� c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���| jd�r�yt | �\}} W q� tjk
r� t
| �\}} Y q�X n t
| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )zPatom = [CFWS] 1*atext [CFWS]
An atom could be an rfc2047 encoded word.
r z expected atom but found '{}'z=?) rK r� r� rS � ATOM_ENDSr r� r# r� r� r� )r rL r. r r r �get_atom� s$
r� c C s� t � }| s| d tkr(tjdj| ���xP| rx| d tkrxt| �\}} |j|� | r*| d dkr*|jt� | dd� } q*W |d tkr�tjdjd| ���|| fS )z( dot-text = 1*atext *("." 1*atext)
r z8expected atom at a start of dot-atom-text but found '{}'r rj Nz4expected atom at end of dot-atom-text but found '{}'rl )ry r� r r� r# r� rS r� )r Z
dot_atom_textr. r r r �get_dot_atom_text� s
r� c C s� t � }| d tkr(t| �\}} |j|� | jd�rhyt| �\}} W qt tjk
rd t| �\}} Y qtX n t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )z� dot-atom = [CFWS] dot-atom-text [CFWS]
Any place we can have a dot atom, we could instead have an rfc2047 encoded
word.
r z=?) rx r� r� rS r� r� r r� r� )r Zdot_atomr. r r r � get_dot_atom s
r� c C s� | d t krt| �\}} nd}| d dkr8t| �\}} n*| d tkrVtjdj| ���n t| �\}} |dk rx|g|dd�< || fS )a� word = atom / quoted-string
Either atom or quoted-string may start with CFWS. We have to peel off this
CFWS first to determine which type of word to parse. Afterward we splice
the leading CFWS, if any, into the parsed sub-token.
If neither an atom or a quoted-string is found before the next special, a
HeaderParseError is raised.
The token returned is either an Atom or a QuotedString, as appropriate.
This means the 'word' level of the formal grammar is not represented in the
parse tree; this is because having that extra layer when manipulating the
parse tree is more confusing than it is helpful.
r Nr
z1Expected 'atom' or 'quoted-string' but found '{}')r� r� r� �SPECIALSr r� r# r� )r �leaderr. r r r �get_word* s
r� c C s� t � }yt| �\}} |j|� W n( tjk
rH |jjtjd�� Y nX x�| r�| d tkr�| d dkr�|jt� |jjtj d�� | dd� } qLyt| �\}} W nD tjk
r� | d t
kr�t | �\}} |jjtj d�� n� Y nX |j|� qLW || fS )a� phrase = 1*word / obs-phrase
obs-phrase = word *(word / "." / CFWS)
This means a phrase can be a sequence of words, periods, and CFWS in any
order as long as it starts with at least one word. If anything other than
words is detected, an ObsoleteHeaderDefect is added to the token's defect
list. We also accept a phrase that starts with CFWS followed by a dot;
this is registered as an InvalidHeaderDefect, since it is not supported by
even the obsolete grammar.
z phrase does not start with wordr r zperiod in 'phrase'rj Nzcomment found without atom) rF r� rS r r� r r� � PHRASE_ENDSr� �ObsoleteHeaderDefectr� r� )r rG r. r r r �
get_phraseI s.
r� c C st t � }d}| d tkr"t| �\}} | s6tjdj| ���yt| �\}} W n^ tjk
r� yt| �\}} W n6 tjk
r� | d dkr�| d tkr�� t � }Y nX Y nX |dk r�|g|dd�< |j
|� | o�| d dks�| d tk�r2t t |�| �\}} |j
dk�r|jj
tjd�� n|jj
tjd�� ||d< y|jjd� W n( tk
�rj |jj
tjd �� Y nX || fS )
z= local-part = dot-atom / quoted-string / obs-local-part
Nr z"expected local-part but found '{}'r zinvalid-obs-local-partz<local-part is not dot-atom, quoted-string, or obs-local-partz,local-part is not a dot-atom (contains CFWS)�asciiz)local-part contains non-ASCII characters))r� r� r� r r� r# r� r� r� r rS �get_obs_local_partr r7 r r� r� r �encoder� ZNonASCIILocalPartDefect)r rm r� r. �obs_local_partr r r �get_local_parto sB
r� c C s� t � }d}�x | o(| d dks,| d tk�r*| d dkrl|rN|jjtjd�� |jt� d}| dd� } qnD| d dkr�|jt| d d �� | dd� } |jjtjd
�� d}q|r�|d jd kr�|jjtjd �� yt | �\}} d}W n4 tj
k
�r | d t k�r � t | �\}} Y nX |j|� qW |d jd k�s\|d jd
k�rn|d jd k�rn|jjtjd�� |d jd k�s�|d jd
k�r�|d jd k�r�|jjtjd�� |j�r�d|_|| fS )z' obs-local-part = word *("." word)
Fr r r zinvalid repeated '.'Trj Nzmisplaced-specialz/'\' character outside of quoted-string/ccontentr� zmissing '.' between wordsrJ z!Invalid leading '.' in local partrh z"Invalid trailing '.' in local partzinvalid-obs-local-partrl rl rl r� )
r� r� r rS r r� r� r� r7 r� r� r� r� )r r� Zlast_non_ws_was_dotr. r r r r� � sV "
r� c C s@ t | d�\}} }t|d�}|r0|jjtjd�� t|� || fS )a dtext = <printable ascii except \ [ ]> / obs-dtext
obs-dtext = obs-NO-WS-CTL / quoted-pair
We allow anything except the excluded characters, but if we find any
ASCII other than the RFC defined printable ASCII, a NonPrintableDefect is
added to the token's defects list. Quoted pairs are converted to their
unquoted values, so what is returned is a ptext token, in this case a
ValueTerminal. If there were quoted-printables, an ObsoleteHeaderDefect is
added to the returned token's defect list.
z[]r� z(quoted printable found in domain-literal)r� r� r rS r r� r� )r r� r� r r r � get_dtext� s
r c C s, | rdS |j tjd�� |j tdd�� dS )NFz"end of input inside domain-literalr� zdomain-literal-endT)rS r r� r� )r �domain_literalr r r �_check_for_early_dl_end� s r c C sl t � }| d tkr(t| �\}} |j|� | s6tjd��| d dkrRtjdj| ���| dd� } t| |�rp|| fS |jtdd�� | d t kr�t
| �\}} |j|� t | �\}} |j|� t| |�r�|| fS | d t kr�t
| �\}} |j|� t| |��r || fS | d dk�r tjd j| ���|jtdd
�� | dd� } | �rd| d tk�rdt| �\}} |j|� || fS ) zB domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
r zexpected domain-literal�[z6expected '[' at start of domain-literal but found '{}'rj Nzdomain-literal-startr� z4expected ']' at end of domain-literal but found '{}'zdomain-literal-end) r� r� r� rS r r� r# r r� r� r� r )r r r. r r r �get_domain_literal� sD
r c C st t � }d}| d tkr"t| �\}} | s6tjdj| ���| d dkrvt| �\}} |dk rd|g|dd�< |j|� || fS yt| �\}} W n" tjk
r� t | �\}} Y nX | r�| d dkr�tjd��|dk r�|g|dd�< |j|� | o�| d dk�rl|j
jtj d�� |d j d k�r(|d |dd�< xB| �rj| d dk�rj|jt
� t | d
d� �\}} |j|� �q*W || fS ) z] domain = dot-atom / domain-literal / obs-domain
obs-domain = atom *("." atom))
Nr z expected domain but found '{}'r r~ zInvalid Domainr z(domain is not a dot-atom (contains CFWS)zdot-atomrj )rv r� r� r r� r# r rS r� r� r r� r7 r� )r rn r� r. r r r �
get_domain s@
r c C s~ t � }t| �\}} |j|� | s.| d dkrH|jjtjd�� || fS |jtdd�� t| dd� �\}} |j|� || fS )z( addr-spec = local-part "@" domain
r r~ z"add-spec local part with no domainzaddress-at-symbolrj N)rz r� rS r r r� r� r )r rp r. r r r �
get_addr_spec. s
r c C s� t � }xf| rl| d dks$| d tkrl| d tkrHt| �\}} |j|� q| d dkr|jt� | dd� } qW | s�| d dkr�tjdj| ���|jt� t | dd� �\}} |j|� x�| o�| d dk�rB|jt� | dd� } | s�P | d tk�r t| �\}} |j|� | d dkr�|jt� t | dd� �\}} |j|� q�W | �sTtjd��| d dk�rrtjd j| ���|jt
dd
�� || dd� fS ) z� obs-route = obs-domain-list ":"
obs-domain-list = *(CFWS / ",") "@" domain *("," [CFWS] ["@" domain])
Returns an obs-route token with the appropriate sub-tokens (that is,
there is no obs-domain-list in the parse tree).
r r� rj Nr~ z(expected obs-route domain but found '{}'z%end of header while parsing obs-route�:z4expected ':' marking end of obs-route but found '{}'zend-of-obs-route-marker) rs r� r� rS �
ListSeparatorr r� r# �RouteComponentMarkerr r� )r Z obs_router. r r r �
get_obs_route> sB
r
c C s� t � }| d tkr(t| �\}} |j|� | s:| d dkrJtjdj| ���|jtdd�� | dd� } | d dkr�|jtdd�� |jjtj d �� | dd� } || fS yt
| �\}} W nz tjk
�r2 y"t | �\}} |jjtj d
�� W n( tjk
�r tjd j| ���Y nX |j|� t
| �\}} Y nX |j|� | �r`| d dk�r`| dd� } n|jjtj d �� |jtdd�� | �r�| d tk�r�t| �\}} |j|� || fS )
z� angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
obs-angle-addr = [CFWS] "<" obs-route addr-spec ">" [CFWS]
r �<z"expected angle-addr but found '{}'zangle-addr-startrj N�>zangle-addr-endz null addr-spec in angle-addrz*obsolete route specification in angle-addrz.expected addr-spec or obs-route but found '{}'z"missing trailing '>' on angle-addr)
rq r� r� rS r r� r# r� r r� r r
r� )r Z
angle_addrr. r r r �get_angle_addrg sJ
r
c C s< t � }t| �\}} |j|dd� � |jdd� |_|| fS )z� display-name = phrase
Because this is simply a name-rule, we don't return a display-name
token containing a phrase, but rather a display-name token with
the content of the phrase.
N)r� r� r, r )r rb r. r r r �get_display_name� s
r c C s� t � }d}| d tkr6t| �\}} | s6tjdj|���| d dkr�| d tkr^tjdj| ���t| �\}} | s~tjdj|���|dk r�|g|d dd�< d}|j|� t | �\}} |dk r�|g|dd�< |j|� || fS )z, name-addr = [display-name] angle-addr
Nr z!expected name-addr but found '{}'r )
ri r� r� r r� r# r� r rS r
)r Z name_addrr� r. r r r �
get_name_addr� s0
r c C s� t � }yt| �\}} W nN tjk
rd yt| �\}} W n& tjk
r^ tjdj| ���Y nX Y nX tdd� |jD ��r�d|_|j |� || fS )z& mailbox = name-addr / addr-spec
z expected mailbox but found '{}'c s s | ]}t |tj�V qd S )N)r� r r� )r r r r r r � s z get_mailbox.<locals>.<genexpr>zinvalid-mailbox)
rt r r r� r r# �anyr& r7 rS )r rc r. r r r � get_mailbox� s
r c C sh t � }xX| r^| d |kr^| d tkrF|jt| d d�� | dd� } qt| �\}} |j|� qW || fS )z� Read everything up to one of the chars in endchars.
This is outside the formal grammar. The InvalidMailbox TokenList that is
returned acts like a Mailbox, but the data attributes are None.
r zmisplaced-specialrj N)ru r� rS r� r� )r r� Zinvalid_mailboxr. r r r �get_invalid_mailbox� s r c C s� t � }�x�| o| d dk�r�y t| �\}} |j|� W �n tjk
�r@ d}| d tkr�t| �\}} | sz| d dkr�|j|� |jjtjd�� n@t | d�\}} |dk r�|g|dd�< |j|� |jjtj
d�� nb| d dkr�|jjtjd�� nBt | d�\}} |dk �r |g|dd�< |j|� |jjtj
d�� Y nX | �r�| d dk�r�|d
}d |_ t | d�\}} |j |� |jjtj
d�� | r
| d dkr
|jt
� | dd� } q
W || fS ) aJ mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
obs-mbox-list = *([CFWS] ",") mailbox *("," [mailbox / CFWS])
For this routine we go outside the formal grammar in order to improve error
handling. We recognize the end of the mailbox list only at the end of the
value or at a ';' (the group terminator). This is so that we can turn
invalid mailboxes into InvalidMailbox tokens and continue parsing any
remaining valid mailboxes. We also allow all mailbox entries to be null,
and this condition is handled appropriately at a higher level.
r �;Nz,;z empty element in mailbox-listz invalid mailbox in mailbox-listr� rj zinvalid-mailboxrl )rd r rS r r� r� r� r r� r r� r7 r, r )r Z mailbox_listr. r� rc r r r �get_mailbox_list� sN
r c C s t � }| s$|jjtjd�� || fS d}| r�| d tkr�t| �\}} | sl|jjtjd�� |j|� || fS | d dkr�|j|� || fS t| �\}} t|j �dkr�|dk r�|j|� |j
|� |jjtj d�� || fS |dk r�|g|dd�< |j|� || fS )zg group-list = mailbox-list / CFWS / obs-group-list
obs-group-list = 1*([CFWS] ",") [CFWS]
z end of header before group-listNr zend of header in group-listr z group-list with empty entries) rf r rS r r� r� r� r rk r_ r, r� )r Z
group_listr� r. r r r �get_group_list" s8
r c C s" t � }t| �\}} | s$| d dkr4tjdj| ���|j|� |jtdd�� | dd� } | r�| d dkr�|jtdd�� || dd� fS t| �\}} |j|� | s�|jjtj d �� n | d dkr�tjd
j| ���|jtdd�� | dd� } | �r| d t
k�rt | �\}} |j|� || fS ) z7 group = display-name ":" [group-list] ";" [CFWS]
r r z8expected ':' at end of group display name but found '{}'z group-display-name-terminatorrj Nr zgroup-terminatorzend of header in groupz)expected ';' at end of group but found {}) rg r r r� r# rS r� r r r� r� r� )r ra r. r r r � get_groupG s2
r c C sx t � }yt| �\}} W nN tjk
rd yt| �\}} W n& tjk
r^ tjdj| ���Y nX Y nX |j|� || fS )a� address = mailbox / group
Note that counter-intuitively, an address can be either a single address or
a list of addresses (a group). This is why the returned Address object has
a 'mailboxes' attribute which treats a single address as a list of length
one. When you need to differentiate between to two cases, extract the single
element, which is either a mailbox or a group token.
z expected address but found '{}')r` r r r� r r# rS )r r\ r. r r r � get_addresse s
r c C s� t � }�x�| �r�y t| �\}} |j|� W �n$ tjk
�rP } �zd}| d tkr�t| �\}} | sr| d dkr�|j|� |jjtjd�� nFt | d�\}} |dk r�|g|dd�< |jt
|g�� |jjtj d�� nh| d dkr�|jjtjd�� nHt | d�\}} |dk �r |g|dd�< |jt
|g�� |jjtj d�� W Y dd}~X nX | �r�| d dk�r�|d
d }d|_ t | d�\}} |j
|� |jjtj d�� | r
|jtdd �� | dd� } q
W || fS ) a� address_list = (address *("," address)) / obs-addr-list
obs-addr-list = *([CFWS] ",") address *("," [address / CFWS])
We depart from the formal grammar here by continuing to parse until the end
of the input, assuming the input to be entirely composed of an
address-list. This is always true in email parsing, and allows us
to skip invalid addresses to parse additional valid ones.
Nr r� z"address-list entry with no contentz invalid address in address-listz empty element in address-listrj zinvalid-mailboxzlist-separatorrl )r[ r rS r r� r� r� r r� r r` r� r7 r, r� )r Z address_listr. �errr� rc r r r �get_address_list� sN
r c C s� t � }| s |jjtjd�� |S | d tkrXt| �\}} |j|� | sX|jjtjd�� d}x8| r�| d dkr�| d tkr�|| d 7 }| dd� } q^W |j� s�|jjtjdj |��� |jt
|d �� nt |�|_ |jt
|d
�� | o�| d tk�r
t| �\}} |j|� | �s | d dk�rX|j dk �r>|jjtjd �� | �rT|jt
| d �� |S |jt
dd �� | dd� } | �r�| d tk�r�t| �\}} |j|� | �s�|j dk �r�|jjtjd �� |S d}x2| �r�| d tk�r�|| d 7 }| dd� } �q�W |j� �s2|jjtjd
j |��� |jt
|d �� nt |�|_
|jt
|d
�� | �rv| d tk�rvt| �\}} |j|� | �r�|jjtjd�� |jt
| d �� |S )zE mime-version = [CFWS] 1*digit [CFWS] "." [CFWS] 1*digit [CFWS]
z%Missing MIME version number (eg: 1.0)r z0Expected MIME version number but found only CFWSr r rj Nz1Expected MIME major version number but found {!r}r� �digitsz0Incomplete MIME version; found only major numberzversion-separatorz1Expected MIME minor version number but found {!r}z'Excess non-CFWS text after MIME version)r� r rS r �HeaderMissingRequiredValuer� r� �isdigitr� r# r� �intr� r� )r Z mime_versionr. r r r r �parse_mime_version� sv
r c C sh t � }xX| r^| d dkr^| d tkrF|jt| d d�� | dd� } qt| �\}} |j|� qW || fS )z� Read everything up to the next ';'.
This is outside the formal grammar. The InvalidParameter TokenList that is
returned acts like a Parameter, but the data attributes are None.
r r zmisplaced-specialrj N)r� r� rS r� r� )r Zinvalid_parameterr. r r r �get_invalid_parameter s r c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )a8 ttext = <matches _ttext_matcher>
We allow any non-TOKEN_ENDS in ttext, but add defects to the token's
defects list if we find non-ttext characters. We also register defects for
*any* non-printables even though the RFC doesn't exclude all of them,
because we follow the spirit of RFC 5322.
z expected ttext but found '{}'N�ttext)�_non_token_end_matcherr r� r# ra rk r� r� )r r� r r r r � get_ttext s
r" c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )z�token = [CFWS] 1*ttext [CFWS]
The RFC equivalent of ttext is any US-ASCII chars except space, ctls, or
tspecials. We also exclude tabs even though the RFC doesn't.
The RFC implies the CFWS but is not explicit about it in the BNF.
r z expected token but found '{}') rM r� r� rS �
TOKEN_ENDSr r� r# r" )r Zmtokenr. r r r � get_token) s
r$ c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )aQ attrtext = 1*(any non-ATTRIBUTE_ENDS character)
We allow any non-ATTRIBUTE_ENDS in attrtext, but add defects to the
token's defects list if we find non-attrtext characters. We also register
defects for *any* non-printables even though the RFC doesn't exclude all of
them, because we follow the spirit of RFC 5322.
z expected attrtext but found {!r}Nr� )�_non_attribute_end_matcherr r� r# ra rk r� r� )r r� r� r r r � get_attrtext@ s
r& c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )aH [CFWS] 1*attrtext [CFWS]
This version of the BNF makes the CFWS explicit, and as usual we use a
value terminal for the actual run of characters. The RFC equivalent of
attrtext is the token characters, with the subtraction of '*', "'", and '%'.
We include tab in the excluded set just as we do for token.
r z expected token but found '{}') r� r� r� rS �ATTRIBUTE_ENDSr r� r# r& )r r� r. r r r �
get_attributeS s
r( c C sN t | �}|s tjdj| ���|j� }| t|�d� } t|d�}t|� || fS )z�attrtext = 1*(any non-ATTRIBUTE_ENDS character plus '%')
This is a special parsing routine so that we get a value that
includes % escapes as a single string (which we decode as a single
string later).
z)expected extended attrtext but found {!r}Nzextended-attrtext)�#_non_extended_attribute_end_matcherr r� r# ra rk r� r� )r r� r� r r r �get_extended_attrtextj s
r* c C s� t � }| r,| d tkr,t| �\}} |j|� | rL| d tkrLtjdj| ���t| �\}} |j|� | r�| d tkr�t| �\}} |j|� || fS )z� [CFWS] 1*extended_attrtext [CFWS]
This is like the non-extended version except we allow % characters, so that
we can pick up an encoded value as a single string.
r z expected token but found '{}') r� r� r� rS �EXTENDED_ATTRIBUTE_ENDSr r� r# r* )r r� r. r r r �get_extended_attribute| s
r, c C s� t � }| s| d dkr(tjdj| ���|jtdd�� | dd� } | sX| d j� rhtjdj| ���d}x,| r�| d j� r�|| d 7 }| dd� } qnW |d d kr�|d kr�|jjtjd
�� t |�|_
|jt|d �� || fS ) a6 '*' digits
The formal BNF is more complicated because leading 0s are not allowed. We
check for that and add a defect. We also assume no CFWS is allowed between
the '*' and the digits, though the RFC is not crystal clear on that.
The caller should already have dealt with leading CFWS.
r �*z Expected section but found {}zsection-markerrj Nz$Expected section number but found {}r �0z'section number has an invalid leading 0r ) r� r r� r# rS r� r r ZInvalidHeaderErrorr r� )r r� r r r r � get_section� s&
r/ c C s� t � }| stjd��d}| d tkr0t| �\}} | sDtjdj|���| d dkr^t| �\}} n t| �\}} |dk r�|g|dd�< |j|� || fS )z quoted-string / attribute
z&Expected value but found end of stringNr z Expected value but found only {}r
) r� r r� r� r� r# r� r, rS )r �vr� r. r r r � get_value� s
r1 c C s� t � }t| �\}} |j|� | s.| d dkrN|jjtjdj|��� || fS | d dkr�y t| �\}} d|_|j|� W n tj k
r� Y nX | s�tj d��| d dkr�|jt
dd�� | dd � } d|_ | d d
kr�tj d ��|jt
d
d �� | dd � } d }| �r.| d t k�r.t
| �\}} |j|� d }|}|j �rH| �rH| d d
k�rHt| �\}}|j}d}|jdk�r�|�r�|d dk�r�d}n$t|�\}} | �r�| d dk�r�d}n(yt|�\}} W n Y n X | �s�d}|�r2|jjtjd�� |j|� x,|D ]$}
|
jdk�rg |
d d �< |
}P �qW |} nd }|jjtjd�� | �rb| d dk�rbd }n t| �\}} |j �s�|jdk�r�| �s�| d dk�r�|j|� |d k �r�| �s�t| ��|} || fS |jjtjd�� | �s|jjtjd�� |j|� |d k�r|| fS n�|d k �rVx |D ]}
|
jdk�r"P �q"W |
jdk |j|
� |
j|_| d dk�rttj dj| ���|jt
dd�� | dd � } | �r�| d dk�r�t| �\}} |j|� |j|_| �s�| d dk�r�tj dj| ���|jt
dd�� | dd � } |d k �rZt� } x>| �rR| d tk�r8t| �\}} n t | �\}} | j|� �qW | }n t| �\}} |j|� |d k �r�| �s�t| ��|} || fS )aY attribute [section] ["*"] [CFWS] "=" value
The CFWS is implied by the RFC but not made explicit in the BNF. This
simplified form of the BNF from the RFC is made to conform with the RFC BNF
through some extra checks. We do it this way because it makes both error
recovery and working with the resulting parse tree easier.
r r z)Parameter contains name ({}) but no valuer- TzIncomplete parameterzextended-parameter-markerrj N�=z Parameter not followed by '='zparameter-separatorr
F�'z5Quoted string value for extended parameter is invalidzbare-quoted-stringzZParameter marked as extended but appears to have a quoted string value that is non-encodedzcApparent initial-extended-value but attribute was not marked as extended or was not initial sectionz(Missing required charset/lang delimiterszextended-attrtextr� z=Expected RFC2231 char/lang encoding delimiter, but found {!r}zRFC2231-delimiterz;Expected RFC2231 char/lang encoding delimiter, but found {}) r� r( rS r r r� r# r/ r� r� r� r� r� r� r� rV r� r& r* r7 r1 �AssertionErrorr rP rQ r� r� r� r� ) r r� r. r� r� ZappendtoZqstringZ inner_valueZ
semi_validr� �tr0 r r r �
get_parameter� s�
r6 c C sh t � }�xZ| �rbyt| �\}} |j|� W n� tjk
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attributes keyword arguments, and returning a new instance
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operand overriding those in the left hand operand. That is,
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Controls for how messages are interpreted and formatted.
Most of the classes and many of the methods in the email package accept
Policy objects as parameters. A Policy object contains a set of values and
functions that control how input is interpreted and how output is rendered.
For example, the parameter 'raise_on_defect' controls whether or not an RFC
violation results in an error being raised or not, while 'max_line_length'
controls the maximum length of output lines when a Message is serialized.
Any valid attribute may be overridden when a Policy is created by passing
it as a keyword argument to the constructor. Policy objects are immutable,
but a new Policy object can be created with only certain values changed by
calling the Policy instance with keyword arguments. Policy objects can
also be added, producing a new Policy object in which the non-default
attributes set in the right hand operand overwrite those specified in the
left operand.
Settable attributes:
raise_on_defect -- If true, then defects should be raised as errors.
Default: False.
linesep -- string containing the value to use as separation
between output lines. Default '\n'.
cte_type -- Type of allowed content transfer encodings
7bit -- ASCII only
8bit -- Content-Transfer-Encoding: 8bit is allowed
Default: 8bit. Also controls the disposition of
(RFC invalid) binary data in headers; see the
documentation of the binary_fold method.
max_line_length -- maximum length of lines, excluding 'linesep',
during serialization. None or 0 means no line
wrapping is done. Default is 78.
mangle_from_ -- a flag that, when True escapes From_ lines in the
body of the message by putting a `>' in front of
them. This is used when the message is being
serialized by a generator. Default: True.
message_factory -- the class to use to create new message objects.
If the value is None, the default is Message.
verify_generated_headers
-- if true, the generator verifies that each header
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N)Zdefects�append)r r= r> r r r r< � s zPolicy.register_defectc C s dS )a[ Return the maximum allowed number of headers named 'name'.
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Because the default behavior of Message's __setitem__ is to append the
value to the list of headers, it is easy to create duplicate headers
without realizing it. This method allows certain headers to be limited
in the number of instances of that header that may be added to a
Message programmatically. (The limit is not observed by the parser,
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This particular policy is the backward compatibility Policy. It
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The name is parsed as everything up to the ':' and returned unmodified.
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The name and value are returned unmodified.
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Headers are folded using the Header folding algorithm, which preserves
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PROVISIONAL
The API extensions enabled by this policy are currently provisional.
Refer to the documentation for details.
This policy adds new header parsing and folding algorithms. Instead of
simple strings, headers are custom objects with custom attributes
depending on the type of the field. The folding algorithm fully
implements RFCs 2047 and 5322.
In addition to the settable attributes listed above that apply to
all Policies, this policy adds the following additional attributes:
utf8 -- if False (the default) message headers will be
serialized as ASCII, using encoded words to encode
any non-ASCII characters in the source strings. If
True, the message headers will be serialized using
utf8 and will not contain encoded words (see RFC
6532 for more on this serialization format).
refold_source -- if the value for a header in the Message object
came from the parsing of some source, this attribute
indicates whether or not a generator should refold
that value when transforming the message back into
stream form. The possible values are:
none -- all source values use original folding
long -- source values that have any line that is
longer than max_line_length will be
refolded
all -- all values are refolded.
The default is 'long'.
header_factory -- a callable that takes two arguments, 'name' and
'value', where 'name' is a header field name and
'value' is an unfolded header field value, and
returns a string-like object that represents that
header. A default header_factory is provided that
understands some of the RFC5322 header field types.
(Currently address fields and date fields have
special treatment, while all other fields are
treated as unstructured. This list will be
completed before the extension is marked stable.)
content_manager -- an object with at least two methods: get_content
and set_content. When the get_content or
set_content method of a Message object is called,
it calls the corresponding method of this object,
passing it the message object as its first argument,
and any arguments or keywords that were passed to
it as additional arguments. The default
content_manager is
:data:`~email.contentmanager.raw_data_manager`.
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object of some sort). If a source value needs to be refolded according
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Source values are split into lines using splitlines. If the value is
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policy and returned. The exception is lines containing non-ascii
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refold_header setting, since there is no way to know whether the binary
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�}Y nX |j|�| _| jd|� Y nX dS ) a� Set the charset of the payload to a given character set.
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Content-Type field. Anything else will generate a TypeError.
The message will be assumed to be of type text/* encoded with
charset.input_charset. It will be converted to charset.output_charset
and encoded properly, if needed, when generating the plain text
representation of the message. MIME headers (MIME-Version,
Content-Type, Content-Transfer-Encoding) will be added as needed.
Nr
z MIME-Versionz1.0z Content-Typez
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rg rQ r r r rl C s8
zMessage.set_charsetc C s | j S )zKReturn the Charset instance associated with the message's payload.
)r8 )r; r r r � get_charsetr s zMessage.get_charsetc C s
t | j�S )z9Return the total number of headers, including duplicates.)r r5 )r; r r r �__len__z s zMessage.__len__c C s
| j |�S )a- Get a header value.
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)r] )r; �namer r r � __getitem__~ s zMessage.__getitem__c C sv | j j|�}|r\|j� }d}x>| jD ]4\}}|j� |kr$|d7 }||kr$tdj||���q$W | jj| j j||�� dS )z�Set the value of a header.
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ValueError�formatr, �header_store_parse)r; rs �valZ max_countZlname�found�k�vr r r � __setitem__� s zMessage.__setitem__c C sD |j � }g }x,| jD ]"\}}|j � |kr|j||f� qW || _dS )zwDelete all occurrences of a header, if present.
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N)r+ r5 r, )r; rs �
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<listcomp>� s z(Message.__contains__.<locals>.<listcomp>)r+ r5 )r; rs r r r � __contains__� s zMessage.__contains__c c s x| j D ]\}}|V qW d S )N)r5 )r; Zfieldr$ r r r �__iter__� s zMessage.__iter__c C s dd� | j D �S )a. Return a list of all the message's header field names.
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list.
c S s g | ] \}}|�qS r r )r rz r{ r r r r� � s z Message.keys.<locals>.<listcomp>)r5 )r; r r r �keys� s z Message.keysc s � fdd�� j D �S )a) Return a list of all the message's header values.
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list.
c s g | ]\}}� j j||��qS r )r4 �header_fetch_parse)r rz r{ )r; r r r� � s z"Message.values.<locals>.<listcomp>)r5 )r; r )r; r �values� s
zMessage.valuesc s � fdd�� j D �S )a' Get all the message's header fields and values.
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Any fields deleted and re-inserted are always appended to the header
list.
c s" g | ]\}}|� j j||�f�qS r )r4 r� )r rz r{ )r; r r r� � s z!Message.items.<locals>.<listcomp>)r5 )r; r )r; r �items� s
z
Message.itemsc C s: |j � }x,| jD ]"\}}|j � |kr| jj||�S qW |S )z~Get a header value.
Like __getitem__() but return failobj instead of None when the field
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)r+ r5 r4 r� )r; rs �failobjrz r{ r r r r] � s
z Message.getc C s | j j||f� dS )z�Store name and value in the model without modification.
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)r+ r5 r, r4 r� )r; rs r� r� rz r{ r r r �get_all� s zMessage.get_allc K st g }xH|j � D ]<\}}|dkr2|j|jdd�� q|jt|jdd�|�� qW |dk rb|jd|� tj|�| |< dS )u� Extended header setting.
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parameter value contains non-ASCII characters it can be specified as a
three-tuple of (charset, language, value), in which case it will be
encoded according to RFC2231 rules. Otherwise it will be encoded using
the utf-8 charset and a language of ''.
Examples:
msg.add_header('content-disposition', 'attachment', filename='bud.gif')
msg.add_header('content-disposition', 'attachment',
filename=('utf-8', '', Fußballer.ppt'))
msg.add_header('content-disposition', 'attachment',
filename='Fußballer.ppt'))
N�_�-r )r� r, rT r% �insert� SEMISPACErc )r; �_name�_valueZ_params�partsrz r{ r r r ro s zMessage.add_headerc C s^ |j � }xPttt| j��| j�D ].\}\}}|j � |kr | jj||�| j|< P q W t|��dS )z�Replace a header.
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message, the default type as given by get_default_type() will be
returned. Since according to RFC 2045, messages always have a default
type this will always return a value.
RFC 2045 defines a message's default type to be text/plain unless it
appears inside a multipart/digest container, in which case it would be
message/rfc822.
z content-typer �/r z
text/plain)�objectr] �get_default_typer r+ r) )r; �missingr$ �ctyper r r �get_content_type4 s
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the parameter the value is the empty string. The value is as
described in the get_param() method.
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zMessage.get_paramsc C sJ || kr |S x8| j ||�D ](\}}|j� |j� kr|r>t|�S |S qW |S )a� Return the parameter value if found in the Content-Type header.
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value can either be a string, or a 3-tuple if the parameter was RFC
2231 encoded. When it's a 3-tuple, the elements of the value are of
the form (CHARSET, LANGUAGE, VALUE). Note that both CHARSET and
LANGUAGE can be None, in which case you should consider VALUE to be
encoded in the us-ascii charset. You can usually ignore LANGUAGE.
The parameter value (either the returned string, or the VALUE item in
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If your application doesn't care whether the parameter was RFC 2231
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|�} |s�| }q�tj|| g�}q�W || j|�k�r|�r | j ||� n| |= || |< dS )a� Set a parameter in the Content-Type header.
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value will be appended as per RFC 2045.
An alternate header can be specified in the header argument, and all
parameters will be quoted as necessary unless requote is False.
If charset is specified, the parameter will be encoded according to RFC
2231. Optional language specifies the RFC 2231 language, defaulting
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zMessage.set_paramc C s� || kr dS d}xR| j ||d�D ]@\}}|j� |j� kr |sJt|||�}q tj|t|||�g�}q W || j|�kr�| |= || |< dS )a> Remove the given parameter completely from the Content-Type header.
The header will be re-written in place without the parameter or its
value. All values will be quoted as necessary unless requote is
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Nr )r� r2 )r� r+ r% r� rc r] )r; r r� r� Z new_ctyper� r{ r r r rn � s zMessage.del_paramc C s� |j d�dkst�|j� dkr,| d= d| d< || kr@|| |< dS | j||d�}| |= || |< x(|dd� D ]\}}| j||||� qjW dS ) aK Set the main type and subtype for the Content-Type header.
type must be a string in the form "maintype/subtype", otherwise a
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parameters in place. If requote is False, this leaves the existing
header's quoting as is. Otherwise, the parameters will be quoted (the
default).
An alternative header can be specified in the header argument. When
the Content-Type header is set, we'll always also add a MIME-Version
header.
r� r z content-typez mime-versionz1.0z MIME-VersionN)r� r2 )r) ru r+ r� rp )r; r\ r� r� r� r� r{ r r r �set_type s zMessage.set_typec C sD t � }| jd|d�}||kr*| jd|d�}||kr6|S tj|�j� S )a@ Return the filename associated with the payload if present.
The filename is extracted from the Content-Disposition header's
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�filenamezcontent-dispositionrs z content-type)r� r_ r �collapse_rfc2231_valuer )r; r� r� r� r r r � get_filename& s zMessage.get_filenamec C s, t � }| jd|�}||kr |S tj|�j� S )z�Return the boundary associated with the payload if present.
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zMessage.get_boundaryc C s t � }| j|d�}||kr$tjd��g }d}xB|D ]:\}}|j� dkr^|jdd| f� d}q2|j||f� q2W |s�|jdd| f� g }x�| jD ]�\} }
| j� dk�rg } x6|D ].\} }
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a� Set the boundary parameter in Content-Type to 'boundary'.
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HeaderParseError is raised if the message has no Content-Type header.
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r� |S X |j� S )z�Return the charset parameter of the Content-Type header.
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ZpcharsetrH r r r �get_content_charsetq s
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payload.
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in the Content-Type header of that part) or the value of the
'failobj' parameter (defaults to None), if the part does not have a
main MIME type of "text", or the charset is not defined.
The list will contain one string for each part of the message, plus
one for the container message (i.e. self), so that a non-multipart
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c s g | ]}|j � ��qS r )r� )r �part)r� r r r� � s z(Message.get_charsets.<locals>.<listcomp>)�walk)r; r� r )r� r � get_charsets� s zMessage.get_charsetsc C s* | j d�}|dkrdS t|�d j� }|S )z�Return the message's content-disposition if it exists, or None.
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z Message.get_content_disposition)r� )Fr N)FN)NF)N)N)N)Nr� T)Nr� T)r� TNr F)r� T)r� T)N)N)N)N)4�__name__�
__module__� __qualname__�__doc__r r< r> r= rI rH rL rM rN rR rh rm rl rq rr rt r| r~ r� r� r� r� r� r] r� r� r� ro r� r� r� r� r� r� r� r� r_ rp rn r� r� r� r� r� r� r� Zemail.iteratorsr� r r r r r i sb
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c s� e Zd Zd3dd�Zd4� fdd� Zdd� Zd d
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d d � Zd;d d!�Zd<d"d#�Zd=d$d%�Zdd&�d'd(�Zd)d*� Zd+d,� Zd-d.� Zd/d0� Zd1d2� Z� ZS )>�MIMEPartNc C s( |d krddl m} |}tj| |� d S )Nr )�default)Z email.policyr� r r< )r; r4 r� r r r r< � s zMIMEPart.__init__Fc s0 |dkr| j n|}|dkr |j}t� j||d�S )a Return the entire formatted message as a string.
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header. maxheaderlen is retained for backward compatibility with the
base Message class, but defaults to None, meaning that the policy value
for max_line_length controls the header maximum length. 'policy' is
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is not specified the policy associated with the message instance is
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zMIMEPart.is_attachmentc c s |j � r d S |j� jd�\}}|dkrB||kr>|j|�|fV d S |dkrNd S |dkr~x"|j� D ]}| j||�E d H q`W d S d|kr�|jd�|fV d }|jd�}|r�x"|j� D ]}|d |kr�|}P q�W |d kr�|j� }|r�|d nd }|d k �r| j||�E d H d S )Nr� �text� multipart�related�startz
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matching each of the items in preferencelist, and return the part
corresponding to the first item that has a match, or None if no items
have a match. If 'related' is not included in preferencelist, consider
the root part of any multipart/related encountered as a candidate
match. Ignore parts with 'Content-Disposition: attachment'.
Nr )r r� )r; r� Z best_prioZbodyZprior� r r r �get_body� s
zMIMEPart.get_bodyr� r� � alternativec c s | j � jd�\}}|dks"|dkr&dS | j� j� }|dkr�|dkr�| jd�}|r�d}g }x*|D ]"}|jd�|krvd }q^|j|� q^W |r�|E dH dS |jd
� |E dH dS g }xP|D ]H}|j � jd�\}}||f| jkr�|j � r�||kr�|j|� q�|V q�W dS ) a Return an iterator over the non-main parts of a multipart.
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multipart/related, or multipart/alternative in the multipart (unless
they have a 'Content-Disposition: attachment' header) and include all
remaining subparts in the returned iterator. When applied to a
multipart/related, return all parts except the root part. Return an
empty iterator when applied to a multipart/alternative or a
non-multipart.
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r� r� rh r� r_ r] r, �pop� _body_typesr� ) r; r� r� r� r� ry Z attachmentsr� �seenr r r �iter_attachments s6
zMIMEPart.iter_attachmentsc c s | j � dkr| j� E dH dS )z~Return an iterator over all immediate subparts of a multipart.
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r� N)r� rh )r; r r r r� 4 s zMIMEPart.iter_parts)�content_managerc O s" |d kr| j j}|j| f|�|�S )N)r4 r� � get_content)r; r� �args�kwr r r r� < s zMIMEPart.get_contentc O s& |d kr| j j}|j| f|�|� d S )N)r4 r� � set_content)r; r� r� r� r r r r� A s zMIMEPart.set_contentc
C s� | j � dkr6| j� }||f }||kr6tdj||���g }g }x>| jD ]4\}}|j� jd�rl|j||f� qF|j||f� qFW |r�t| �| j d�} || _| j
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r; r� Zdisallowed_subtypesr� Zexisting_subtypeZ keep_headersZ part_headersrs r$ r� r r r �_make_multipartF s,
zMIMEPart._make_multipartc C s | j dd|� d S )Nr� r� �mixed)r� r� )r� )r; r� r r r � make_relateda s zMIMEPart.make_relatedc C s | j dd|� d S )Nr� r� )r� )r� )r; r� r r r �make_alternatived s zMIMEPart.make_alternativec C s | j df |� d S )Nr� )r� )r; r� r r r �
make_mixedg s zMIMEPart.make_mixed)�_dispc O sf | j � dks| j� |kr(t| d| �� t| �| jd�}|j||� |rXd|krX||d< | j|� d S )Nr� Zmake_)r4 zcontent-dispositionzContent-Disposition)r� r� �getattrr\ r4 r� rR )r; Z_subtyper� r� r� r� r r r �_add_multipartj s zMIMEPart._add_multipartc O s | j d|�ddi|�� d S )Nr� r� Zinline)r� )r� )r; r� r� r r r � add_relatedt s zMIMEPart.add_relatedc O s | j d|�|� d S )Nr� )r� )r� )r; r� r� r r r �add_alternativew s zMIMEPart.add_alternativec O s | j d|�ddi|�� d S )Nr� r� r� )r� )r� )r; r� r� r r r �add_attachmentz s zMIMEPart.add_attachmentc C s g | _ d | _d S )N)r5 r7 )r; r r r �clear} s zMIMEPart.clearc C s dd� | j D �| _ d | _d S )Nc S s& g | ] \}}|j � jd �s||f�qS )zcontent-)r+ r� )r �nr{ r r r r� � s z*MIMEPart.clear_content.<locals>.<listcomp>)r5 r7 )r; r r r �
clear_content� s zMIMEPart.clear_content)N)FNN�r� r� r� )r� )r� r� )r� r� )r� r� )r� r� )N)N)N)r� r� r� r< r= r> r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� �
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0.9 request; this form has no optional headers and data part and
the reply consists of just the data.
The reply form of the HTTP 1.x protocol again has three parts:
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2. An optional set of RFC-822-style headers
3. The data
Again, the headers and data are separated by a blank line.
The response code line has the form
<version> <responsecode> <responsestring>
where <version> is the protocol version ("HTTP/1.0" or "HTTP/1.1"),
<responsecode> is a 3-digit response code indicating success or
failure of the request, and <responsestring> is an optional
human-readable string explaining what the response code means.
This server parses the request and the headers, and then calls a
function specific to the request type (<command>). Specifically,
a request SPAM will be handled by a method do_SPAM(). If no
such method exists the server sends an error response to the
client. If it exists, it is called with no arguments:
do_SPAM()
Note that the request name is case sensitive (i.e. SPAM and spam
are different requests).
The various request details are stored in instance variables:
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port);
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class) containing the header information;
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IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING!
The first thing to be written must be the response line. Then
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actual data (if any). The meaning of the header lines depends on
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At the moment, this is the only documentation.
The Basics
----------
Importing is easy...
>>> from http import cookies
Most of the time you start by creating a cookie.
>>> C = cookies.SimpleCookie()
Once you've created your Cookie, you can add values just as if it were
a dictionary.
>>> C = cookies.SimpleCookie()
>>> C["fig"] = "newton"
>>> C["sugar"] = "wafer"
>>> C.output()
'Set-Cookie: fig=newton\r\nSet-Cookie: sugar=wafer'
Notice that the printable representation of a Cookie is the
appropriate format for a Set-Cookie: header. This is the
default behavior. You can change the header and printed
attributes by using the .output() function
>>> C = cookies.SimpleCookie()
>>> C["rocky"] = "road"
>>> C["rocky"]["path"] = "/cookie"
>>> print(C.output(header="Cookie:"))
Cookie: rocky=road; Path=/cookie
>>> print(C.output(attrs=[], header="Cookie:"))
Cookie: rocky=road
The load() method of a Cookie extracts cookies from a string. In a
CGI script, you would use this method to extract the cookies from the
HTTP_COOKIE environment variable.
>>> C = cookies.SimpleCookie()
>>> C.load("chips=ahoy; vienna=finger")
>>> C.output()
'Set-Cookie: chips=ahoy\r\nSet-Cookie: vienna=finger'
The load() method is darn-tootin smart about identifying cookies
within a string. Escaped quotation marks, nested semicolons, and other
such trickeries do not confuse it.
>>> C = cookies.SimpleCookie()
>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
>>> print(C)
Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"
Each element of the Cookie also supports all of the RFC 2109
Cookie attributes. Here's an example which sets the Path
attribute.
>>> C = cookies.SimpleCookie()
>>> C["oreo"] = "doublestuff"
>>> C["oreo"]["path"] = "/"
>>> print(C)
Set-Cookie: oreo=doublestuff; Path=/
Each dictionary element has a 'value' attribute, which gives you
back the value associated with the key.
>>> C = cookies.SimpleCookie()
>>> C["twix"] = "none for you"
>>> C["twix"].value
'none for you'
The SimpleCookie expects that all values should be standard strings.
Just to be sure, SimpleCookie invokes the str() builtin to convert
the value to a string, when the values are set dictionary-style.
>>> C = cookies.SimpleCookie()
>>> C["number"] = 7
>>> C["string"] = "seven"
>>> C["number"].value
'7'
>>> C["string"].value
'seven'
>>> C.output()
'Set-Cookie: number=7\r\nSet-Cookie: string=seven'
Finis.
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request. This diagram details these state transitions:
(null)
|
| HTTPConnection()
v
Idle
|
| putrequest()
v
Request-started
|
| ( putheader() )* endheaders()
v
Request-sent
|\_____________________________
| | getresponse() raises
| response = getresponse() | ConnectionError
v v
Unread-response Idle
[Response-headers-read]
|\____________________
| |
| response.read() | putrequest()
v v
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______/|
/ |
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v v
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|
| response.read()
v
Request-sent
This diagram presents the following rules:
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-- a response [object] cannot be retrieved until {request-sent}
-- there is no differentiation between an unread response body and a
partially read response body
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implies sophisticated clients may accelerate the request/response
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UNTIL the response headers have been read; this means that further
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Logical State __state __response
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| j dkS )z!True if the connection is closed.N)r= )r0 r r r �isclosed� s zHTTPResponse.isclosedc C s� | j d krdS | jdkr$| j� dS |d k rRt|�}| j|�}t|�d |� j� S | jr`| j� S | j d krv| j j
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| j j� S )N)r= �fileno)r0 r r r r� � s zHTTPResponse.filenoc C sH | j dkrt� �| j j|�p |}t|t�s6t|d� r:|S dj|�S dS )ax Returns the value of the header matching *name*.
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present if (as is now usual) the server passed back a file
length in response to the FTP retrieval request. A
Content-Type header will be present if the MIME type can be
guessed.
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a Date representing the file's last-modified time, a
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Note: BaseHTTPRequestHandler doesn't implement any HTTP request; see
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It does, however, optionally implement HTTP/1.1 persistent connections,
as of version 0.3.
Notes on CGIHTTPRequestHandler
------------------------------
This class implements GET and POST requests to cgi-bin scripts.
If the os.fork() function is not present (e.g. on Windows),
subprocess.Popen() is used as a fallback, with slightly altered semantics.
In all cases, the implementation is intentionally naive -- all
requests are executed synchronously.
SECURITY WARNING: DON'T USE THIS CODE UNLESS YOU ARE INSIDE A FIREWALL
-- it may execute arbitrary Python code or external programs.
Note that status code 200 is sent prior to execution of a CGI script, so
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<title>Error response</title>
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<body>
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<p>Error code: %(code)d</p>
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The following explanation of HTTP serves to guide you through the
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:-).
HTTP (HyperText Transfer Protocol) is an extensible protocol on
top of a reliable stream transport (e.g. TCP/IP). The protocol
recognizes three parts to a request:
1. One line identifying the request type and path
2. An optional set of RFC-822-style headers
3. An optional data part
The headers and data are separated by a blank line.
The first line of the request has the form
<command> <path> <version>
where <command> is a (case-sensitive) keyword such as GET or POST,
<path> is a string containing path information for the request,
and <version> should be the string "HTTP/1.0" or "HTTP/1.1".
<path> is encoded using the URL encoding scheme (using %xx to signify
the ASCII character with hex code xx).
The specification specifies that lines are separated by CRLF but
for compatibility with the widest range of clients recommends
servers also handle LF. Similarly, whitespace in the request line
is treated sensibly (allowing multiple spaces between components
and allowing trailing whitespace).
Similarly, for output, lines ought to be separated by CRLF pairs
but most clients grok LF characters just fine.
If the first line of the request has the form
<command> <path>
(i.e. <version> is left out) then this is assumed to be an HTTP
0.9 request; this form has no optional headers and data part and
the reply consists of just the data.
The reply form of the HTTP 1.x protocol again has three parts:
1. One line giving the response code
2. An optional set of RFC-822-style headers
3. The data
Again, the headers and data are separated by a blank line.
The response code line has the form
<version> <responsecode> <responsestring>
where <version> is the protocol version ("HTTP/1.0" or "HTTP/1.1"),
<responsecode> is a 3-digit response code indicating success or
failure of the request, and <responsestring> is an optional
human-readable string explaining what the response code means.
This server parses the request and the headers, and then calls a
function specific to the request type (<command>). Specifically,
a request SPAM will be handled by a method do_SPAM(). If no
such method exists the server sends an error response to the
client. If it exists, it is called with no arguments:
do_SPAM()
Note that the request name is case sensitive (i.e. SPAM and spam
are different requests).
The various request details are stored in instance variables:
- client_address is the client IP address in the form (host,
port);
- command, path and version are the broken-down request line;
- headers is an instance of email.message.Message (or a derived
class) containing the header information;
- rfile is a file object open for reading positioned at the
start of the optional input data part;
- wfile is a file object open for writing.
IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING!
The first thing to be written must be the response line. Then
follow 0 or more header lines, then a blank line, and then the
actual data (if any). The meaning of the header lines depends on
the command executed by the server; in most cases, when data is
returned, there should be at least one header line of the form
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Here's a sample session to show how to use this module.
At the moment, this is the only documentation.
The Basics
----------
Importing is easy...
>>> from http import cookies
Most of the time you start by creating a cookie.
>>> C = cookies.SimpleCookie()
Once you've created your Cookie, you can add values just as if it were
a dictionary.
>>> C = cookies.SimpleCookie()
>>> C["fig"] = "newton"
>>> C["sugar"] = "wafer"
>>> C.output()
'Set-Cookie: fig=newton\r\nSet-Cookie: sugar=wafer'
Notice that the printable representation of a Cookie is the
appropriate format for a Set-Cookie: header. This is the
default behavior. You can change the header and printed
attributes by using the .output() function
>>> C = cookies.SimpleCookie()
>>> C["rocky"] = "road"
>>> C["rocky"]["path"] = "/cookie"
>>> print(C.output(header="Cookie:"))
Cookie: rocky=road; Path=/cookie
>>> print(C.output(attrs=[], header="Cookie:"))
Cookie: rocky=road
The load() method of a Cookie extracts cookies from a string. In a
CGI script, you would use this method to extract the cookies from the
HTTP_COOKIE environment variable.
>>> C = cookies.SimpleCookie()
>>> C.load("chips=ahoy; vienna=finger")
>>> C.output()
'Set-Cookie: chips=ahoy\r\nSet-Cookie: vienna=finger'
The load() method is darn-tootin smart about identifying cookies
within a string. Escaped quotation marks, nested semicolons, and other
such trickeries do not confuse it.
>>> C = cookies.SimpleCookie()
>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
>>> print(C)
Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"
Each element of the Cookie also supports all of the RFC 2109
Cookie attributes. Here's an example which sets the Path
attribute.
>>> C = cookies.SimpleCookie()
>>> C["oreo"] = "doublestuff"
>>> C["oreo"]["path"] = "/"
>>> print(C)
Set-Cookie: oreo=doublestuff; Path=/
Each dictionary element has a 'value' attribute, which gives you
back the value associated with the key.
>>> C = cookies.SimpleCookie()
>>> C["twix"] = "none for you"
>>> C["twix"].value
'none for you'
The SimpleCookie expects that all values should be standard strings.
Just to be sure, SimpleCookie invokes the str() builtin to convert
the value to a string, when the values are set dictionary-style.
>>> C = cookies.SimpleCookie()
>>> C["number"] = 7
>>> C["string"] = "seven"
>>> C["number"].value
'7'
>>> C["string"].value
'seven'
>>> C.output()
'Set-Cookie: number=7\r\nSet-Cookie: string=seven'
Finis.
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S )wa� HTTP cookie handling for web clients.
This module has (now fairly distant) origins in Gisle Aas' Perl module
HTTP::Cookies, from the libwww-perl library.
Docstrings, comments and debug strings in this code refer to the
attributes of the HTTP cookie system as cookie-attributes, to distinguish
them clearly from Python attributes.
Class diagram (note that BSDDBCookieJar and the MSIE* classes are not
distributed with the Python standard library, but are available from
http://wwwsearch.sf.net/):
CookieJar____
/ \ \
FileCookieJar \ \
/ | \ \ \
MozillaCookieJar | LWPCookieJar \ \
| | \
| ---MSIEBase | \
| / | | \
| / MSIEDBCookieJar BSDDBCookieJar
|/
MSIECookieJar
�Cookie� CookieJar� CookiePolicy�DefaultCookiePolicy�
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)�tt�year�monthZmday�hour�min�secr r r �_timegmK s
8Hr, ZMonZTueZWedZThuZFriZSatZSunZJanZFebZMarZAprZMayZJunZJulZAugZSepZOctZNovZDecc C s@ | dkrt j j� }n t j j| �}d|j|j|j|j|j|jf S )aH Return a string representing time in seconds since epoch, t.
If the function is called without an argument, it will use the current
time.
The format of the returned string is like "YYYY-MM-DD hh:mm:ssZ",
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1994-11-24 08:49:37Z
Nz %04d-%02d-%02d %02d:%02d:%02dZ) �datetime�utcnow�utcfromtimestampr' r( �dayr) �minute�second)�t�dtr r r � time2isozY s
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|j f S )z�Return a string representing time in seconds since epoch, t.
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time2netscapel s r8 )ZGMT�UTCZUT�Zz^([-+])?(\d\d?):?(\d\d)?$c C sj d }| t krd}nTtj| �}|rfdt|jd�� }|jd�rR|dt|jd�� }|jd�dkrf| }|S )Nr i r � �< r �-)� UTC_ZONES� TIMEZONE_RE�search�int�group)�tz�offset�mr r r �offset_from_tz_string� s
rF c
C s� t |�}|tjkrd S ytj|j� �d }W nX tk
r� y t |�}W n tk
r\ d S X d| kopdkn r||}nd S Y nX |d kr�d}|d kr�d}|d kr�d}t | �} t |�}t |�}t |�}|dk �r0tjtj� �d }|d } |}
|| | }| |
} t | �dk�r0| dk�r(|d }n|d }t
||| ||||f�} | d k �r�|d k�r^d}|j � }t |�} | d k�r|d S | | } | S )Nr r r i� �d �2 r9 )
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rS zV^[SMTWF][a-z][a-z], (\d\d) ([JFMASOND][a-z][a-z]) (\d\d\d\d) (\d\d):(\d\d):(\d\d) GMT$z+^(?:Sun|Mon|Tue|Wed|Thu|Fri|Sat)[a-z]*,?\s*a� ^
(\d\d?) # day
(?:\s+|[-\/])
(\w+) # month
(?:\s+|[-\/])
(\d+) # year
(?:
(?:\s+|:) # separator before clock
(\d\d?):(\d\d) # hour:min
(?::(\d\d))? # optional seconds
)? # optional clock
\s*
([-+]?\d{2,4}|(?![APap][Mm]\b)[A-Za-z]+)? # timezone
\s*
(?:\(\w+\))? # ASCII representation of timezone in parens.
\s*$c C s� t j| �}|rl|j� }tj|d j� �d }t|d �|t|d �t|d �t|d �t|d �f}t|�S | j � } t
j d| d�} dgd \}}}}}} }
t j| �}|dk r�|j� \}}}}}} }
ndS t
|||||| |
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a� Returns time in seconds since epoch of time represented by a string.
Return value is an integer.
None is returned if the format of str is unrecognized, the time is outside
the representable range, or the timezone string is not recognized. If the
string contains no timezone, UTC is assumed.
The timezone in the string may be numerical (like "-0800" or "+0100") or a
string timezone (like "UTC", "GMT", "BST" or "EST"). Currently, only the
timezone strings equivalent to UTC (zero offset) are known to the function.
The function loosely parses the following formats:
Wed, 09 Feb 1994 22:23:32 GMT -- HTTP format
Tuesday, 08-Feb-94 14:15:29 GMT -- old rfc850 HTTP format
Tuesday, 08-Feb-1994 14:15:29 GMT -- broken rfc850 HTTP format
09 Feb 1994 22:23:32 GMT -- HTTP format (no weekday)
08-Feb-94 14:15:29 GMT -- rfc850 format (no weekday)
08-Feb-1994 14:15:29 GMT -- broken rfc850 format (no weekday)
The parser ignores leading and trailing whitespace. The time may be
absent.
If the year is given with only 2 digits, the function will select the
century that makes the year closest to the current date.
r r r r; � � � N� )�STRICT_DATE_REr@ �groupsrI rJ rK rA �floatr, �lstrip�
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ra a� ^
(\d{4}) # year
[-\/]?
(\d\d?) # numerical month
[-\/]?
(\d\d?) # day
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(?::?(\d\d(?:\.\d*)?))? # optional seconds (and fractional)
)? # optional clock
\s*
([-+]?\d\d?:?(:?\d\d)?
|Z|z)? # timezone (Z is "zero meridian", i.e. GMT)
\s*$c
C sd | j � } dgd \}}}}}}}tj| �}|dk rL|j� \}}}}}}}} ndS t|||||||�S )av
As for http2time, but parses the ISO 8601 formats:
1994-02-03 14:15:29 -0100 -- ISO 8601 format
1994-02-03 14:15:29 -- zone is optional
1994-02-03 -- only date
1994-02-03T14:15:29 -- Use T as separator
19940203T141529Z -- ISO 8601 compact format
19940203 -- only date
NrW )r[ � ISO_DATE_REr@ rY rS )
r_ r0 rP rQ rR r* r+ rC rE �_r r r �iso2time' s
rd c C s* | j d�\}}| jd|� | j|d� S )z)Return unmatched part of re.Match object.r N)�span�string)�match�start�endr r r � unmatchedH s rj z^\s*([^=\s;,]+)z&^\s*=\s*\"([^\"\\]*(?:\\.[^\"\\]*)*)\"z^\s*=\s*([^\s;,]*)z\\(.)c
C s g }�x | D ]�}|}g }x�|r�t j|�}|r�t|�}|jd�}tj|�}|rlt|�}|jd�}tjd|�}n.tj|�}|r�t|�}|jd�}|j� }nd}|j ||f� q|j
� j d�r�|j
� dd� }|r�|j |� g }qt j
dd|�\}} |}qW |r |j |� q W |S )am Parse header values into a list of lists containing key,value pairs.
The function knows how to deal with ",", ";" and "=" as well as quoted
values after "=". A list of space separated tokens are parsed as if they
were separated by ";".
If the header_values passed as argument contains multiple values, then they
are treated as if they were a single value separated by comma ",".
This means that this function is useful for parsing header fields that
follow this syntax (BNF as from the HTTP/1.1 specification, but we relax
the requirement for tokens).
headers = #header
header = (token | parameter) *( [";"] (token | parameter))
token = 1*<any CHAR except CTLs or separators>
separators = "(" | ")" | "<" | ">" | "@"
| "," | ";" | ":" | "\" | <">
| "/" | "[" | "]" | "?" | "="
| "{" | "}" | SP | HT
quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
qdtext = <any TEXT except <">>
quoted-pair = "\" CHAR
parameter = attribute "=" value
attribute = token
value = token | quoted-string
Each header is represented by a list of key/value pairs. The value for a
simple token (not part of a parameter) is None. Syntactically incorrect
headers will not necessarily be parsed as you would want.
This is easier to describe with some examples:
>>> split_header_words(['foo="bar"; port="80,81"; discard, bar=baz'])
[[('foo', 'bar'), ('port', '80,81'), ('discard', None)], [('bar', 'baz')]]
>>> split_header_words(['text/html; charset="iso-8859-1"'])
[[('text/html', None), ('charset', 'iso-8859-1')]]
>>> split_header_words([r'Basic realm="\"foo\bar\""'])
[[('Basic', None), ('realm', '"foobar"')]]
r z\1N�,z^[=\s;]*rV )�HEADER_TOKEN_REr@ rj rB �HEADER_QUOTED_VALUE_RE�HEADER_ESCAPE_REr] �HEADER_VALUE_RE�rstrip�appendr[ �
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W dj|�S )a� Do the inverse (almost) of the conversion done by split_header_words.
Takes a list of lists of (key, value) pairs and produces a single header
value. Attribute values are quoted if needed.
>>> join_header_words([[("text/plain", None), ("charset", "iso-8859-1")]])
'text/plain; charset="iso-8859-1"'
>>> join_header_words([[("text/plain", None)], [("charset", "iso-8859-1")]])
'text/plain, charset="iso-8859-1"'
Nz^\w+$z\\\1z"%s"z%s=%sz; z, )rs r@ �HEADER_JOIN_ESCAPE_REr] rq �join)Zlists�headersrv �attr�k�vr r r �join_header_words� s
r� c C s0 | j d�r| dd � } | jd�r,| d d� } | S )N�"r ���)rr �endswith)r_ r r r � strip_quotes� s
r� c C s d}g }x�| D ]�}g }d}x�t |jd ��D ]�\}}|j� }|jd
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f� q*W |r|� s�|jd� |j|� qW |S )a5 Ad-hoc parser for Netscape protocol cookie-attributes.
The old Netscape cookie format for Set-Cookie can for instance contain
an unquoted "," in the expires field, so we have to use this ad-hoc
parser instead of split_header_words.
XXX This may not make the best possible effort to parse all the crap
that Netscape Cookie headers contain. Ronald Tschalar's HTTPClient
parser is probably better, so could do worse than following that if
this ever gives any trouble.
Currently, this is also used for parsing RFC 2109 cookies.
�expires�domain�path�secure�version�port�max-ageF�;�=r NT�0)r� r� r� r� r� r� r� )r� r� )� enumerate�split�strip� partitionrK r� ra rq ) Z
ns_headersZ known_attrsru Z ns_headerrv � version_setZiiZparam�key�sep�val�lcr r r �parse_ns_headers� s@
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r� c C sl | j � } |j � }| |kr dS t| �s(dS | j|�}|dksB|dkrFdS |jd�sTdS t|dd� �shdS dS )a� Return True if domain A domain-matches domain B, according to RFC 2965.
A and B may be host domain names or IP addresses.
RFC 2965, section 1:
Host names can be specified either as an IP address or a HDN string.
Sometimes we compare one host name with another. (Such comparisons SHALL
be case-insensitive.) Host A's name domain-matches host B's if
* their host name strings string-compare equal; or
* A is a HDN string and has the form NB, where N is a non-empty
name string, B has the form .B', and B' is a HDN string. (So,
x.y.com domain-matches .Y.com but not Y.com.)
Note that domain-match is not a commutative operation: a.b.c.com
domain-matches .c.com, but not the reverse.
TFr r r� Nr� )rK r� �rfindrr )�A�B�ir r r � domain_match s
r� c C s t j| �rdS dS )zdReturn True if text is a sort-of-like a host domain name.
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FT)r� r@ )r_ r r r �liberal_is_HDNB s
r� c C sb | j � } |j � }t| �o t|�s0| |kr,dS dS |jd�}|rL| j|�rLdS | r^| |kr^dS dS )z\For blocking/accepting domains.
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TFr� )rK r� rr r� )r� r� � initial_dotr r r �user_domain_matchL s
r� z:\d+$c C sB | j � }tjj|�d }|dkr,| jdd�}tjd|d�}|j� S )z�Return request-host, as defined by RFC 2965.
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r rV ZHost)� get_full_url�urllib�parseZurlparseZ
get_header� cut_port_rer] rK )�request�url�hostr r r � request_hosta s r� c C s6 t | � }}|jd�dkr.tj|� r.|d }||fS )zzReturn a tuple (request-host, effective request-host name).
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r� r z.localr� )r� �findr� r@ )r� �erhn�req_hostr r r �eff_request_hostq s r� c C s4 | j � }tjj|�}t|j�}|jd�s0d| }|S )z6Path component of request-URI, as defined by RFC 2965.�/)r� r� r� Zurlsplit� escape_pathr� rr )r� r� �partsr� r r r � request_path| s
r� c C s^ | j }|jd�}|dkrV||d d � }y t|� W qZ tk
rR td|� d S X nt}|S )N�:r r znonnumeric port: '%s')r� r� rA rL r �DEFAULT_HTTP_PORT)r� r� r� r� r r r � request_port� s
r� z%/;:@&=+$,!~*'()z%([0-9a-fA-F][0-9a-fA-F])c C s d| j d�j� S )Nz%%%sr )rB rO )rg r r r �uppercase_escaped_char� s r� c C s t jj| t�} tjt| �} | S )zEEscape any invalid characters in HTTP URL, and uppercase all escapes.)r� r� Zquote�HTTP_PATH_SAFE�ESCAPED_CHAR_REr] r� )r� r r r r� � s
r� c C sP | j d�}|dkrL| |d d� }|j d�}t| �rL|dksD|dkrLd| S | S )aB Return reach of host h, as defined by RFC 2965, section 1.
The reach R of a host name H is defined as follows:
* If
- H is the host domain name of a host; and,
- H has the form A.B; and
- A has no embedded (that is, interior) dots; and
- B has at least one embedded dot, or B is the string "local".
then the reach of H is .B.
* Otherwise, the reach of H is H.
>>> reach("www.acme.com")
'.acme.com'
>>> reach("acme.com")
'acme.com'
>>> reach("acme.local")
'.local'
r� r r NZlocal)r� r� )�hr� �br r r �reach� s
r� c C s$ t | �}t|t| j��s dS dS dS )z�
RFC 2965, section 3.3.6:
An unverifiable transaction is to a third-party host if its request-
host U does not domain-match the reach R of the request-host O in the
origin transaction.
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r� c @ sN e Zd ZdZddd�Zdd� Zddd �Zd
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�Zdd� Z dd� Z
dS )r a� HTTP Cookie.
This class represents both Netscape and RFC 2965 cookies.
This is deliberately a very simple class. It just holds attributes. It's
possible to construct Cookie instances that don't comply with the cookie
standards. CookieJar.make_cookies is the factory function for Cookie
objects -- it deals with cookie parsing, supplying defaults, and
normalising to the representation used in this class. CookiePolicy is
responsible for checking them to see whether they should be accepted from
and returned to the server.
Note that the port may be present in the headers, but unspecified ("Port"
rather than"Port=80", for example); if this is the case, port is None.
Fc C s� |d k rt |�}| d k r$t t| ��} |d kr<|dkr<td��|| _|| _|| _|| _|| _|j� | _ || _
|| _ | | _ |
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| _|| _|| _|| _tj|�| _d S )NTz-if port is None, port_specified must be false)rA rZ rL r� rw rx r� �port_specifiedrK r� �domain_specified�domain_initial_dotr� �path_specifiedr� r� �discard�comment� comment_url�rfc2109�copy�_rest)�selfr� rw rx r� r� r� r� r� r� r� r� r� r� r� r� �restr� r r r �__init__� s.
zCookie.__init__c C s
|| j kS )N)r� )r� rw r r r �has_nonstandard_attr s zCookie.has_nonstandard_attrNc C s | j j||�S )N)r� �get)r� rw �defaultr r r �get_nonstandard_attr s zCookie.get_nonstandard_attrc C s || j |< d S )N)r� )r� rw rx r r r �set_nonstandard_attr s zCookie.set_nonstandard_attrc C s, |d krt j � }| jd k r(| j|kr(dS dS )NTF)rM r� )r� �nowr r r �
is_expired s
zCookie.is_expiredc C sX | j d krd}n
d| j }| j| | j }| jd k rFd| j| jf }n| j}d||f S )NrV r� z%s=%sz<Cookie %s for %s>)r� r� r� rx rw )r� �p�limitZ namevaluer r r �__str__% s
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S )wa� HTTP cookie handling for web clients.
This module has (now fairly distant) origins in Gisle Aas' Perl module
HTTP::Cookies, from the libwww-perl library.
Docstrings, comments and debug strings in this code refer to the
attributes of the HTTP cookie system as cookie-attributes, to distinguish
them clearly from Python attributes.
Class diagram (note that BSDDBCookieJar and the MSIE* classes are not
distributed with the Python standard library, but are available from
http://wwwsearch.sf.net/):
CookieJar____
/ \ \
FileCookieJar \ \
/ | \ \ \
MozillaCookieJar | LWPCookieJar \ \
| | \
| ---MSIEBase | \
| / | | \
| / MSIEDBCookieJar BSDDBCookieJar
|/
MSIECookieJar
�Cookie� CookieJar� CookiePolicy�DefaultCookiePolicy�
FileCookieJar� LWPCookieJar� LoadError�MozillaCookieJar� N)�timegmFc G s( t sd S ts dd l}|jd�atj | � S )Nr zhttp.cookiejar)�debug�logger�loggingZ getLogger)�argsr
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r zQa filename was not supplied (nor was the CookieJar instance initialised with one)c C sJ dd l } dd l}dd l}| j� }|jd |� |j� }|jd| dd� d S )Nr zhttp.cookiejar bug!
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r i� c C s� | d d� \}}}}}}|t kr�d| ko2dkn r�d| koJdkn r�d| kobdkn r�d| kozdkn r�d| ko�dkn r�t| �S d S d S ) N� � � � r � �; �= )�
EPOCH_YEARr
)�tt�year�monthZmday�hour�min�secr r r �_timegmK s
8Hr, ZMonZTueZWedZThuZFriZSatZSunZJanZFebZMarZAprZMayZJunZJulZAugZSepZOctZNovZDecc C s@ | dkrt j j� }n t j j| �}d|j|j|j|j|j|jf S )aH Return a string representing time in seconds since epoch, t.
If the function is called without an argument, it will use the current
time.
The format of the returned string is like "YYYY-MM-DD hh:mm:ssZ",
representing Universal Time (UTC, aka GMT). An example of this format is:
1994-11-24 08:49:37Z
Nz %04d-%02d-%02d %02d:%02d:%02dZ) �datetime�utcnow�utcfromtimestampr' r( �dayr) �minute�second)�t�dtr r r � time2isozY s
r5 c C sR | dkrt j j� }n t j j| �}dt|j� |jt|jd |j|j |j
|j f S )z�Return a string representing time in seconds since epoch, t.
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time.
The format of the returned string is like this:
Wed, DD-Mon-YYYY HH:MM:SS GMT
Nz#%s, %02d-%s-%04d %02d:%02d:%02d GMTr ) r- r. r/ �DAYSZweekdayr0 �MONTHSr( r' r) r1 r2 )r3 r4 r r r �
time2netscapel s r8 )ZGMT�UTCZUT�Zz^([-+])?(\d\d?):?(\d\d)?$c C sj d }| t krd}nTtj| �}|rfdt|jd�� }|jd�rR|dt|jd�� }|jd�dkrf| }|S )Nr i r � �< r �-)� UTC_ZONES� TIMEZONE_RE�search�int�group)�tz�offset�mr r r �offset_from_tz_string� s
rF c
C s� t |�}|tjkrd S ytj|j� �d }W nX tk
r� y t |�}W n tk
r\ d S X d| kopdkn r||}nd S Y nX |d kr�d}|d kr�d}|d kr�d}t | �} t |�}t |�}t |�}|dk �r0tjtj� �d }|d } |}
|| | }| |
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||| ||||f�} | d k �r�|d k�r^d}|j � }t |�} | d k�r|d S | | } | S )Nr r r i� �d �2 r9 )
rA r- ZMAXYEAR� MONTHS_LOWER�index�lower�
ValueError�timeZ localtime�absr, �upperrF )
r0 �mon�yr�hrr* r+ rC ZimonZcur_yrrE Ztmpr3 rD r r r � _str2time� sV
rS zV^[SMTWF][a-z][a-z], (\d\d) ([JFMASOND][a-z][a-z]) (\d\d\d\d) (\d\d):(\d\d):(\d\d) GMT$z+^(?:Sun|Mon|Tue|Wed|Thu|Fri|Sat)[a-z]*,?\s*a� ^
(\d\d?) # day
(?:\s+|[-\/])
(\w+) # month
(?:\s+|[-\/])
(\d+) # year
(?:
(?:\s+|:) # separator before clock
(\d\d?):(\d\d) # hour:min
(?::(\d\d))? # optional seconds
)? # optional clock
\s*
([-+]?\d{2,4}|(?![APap][Mm]\b)[A-Za-z]+)? # timezone
\s*
(?:\(\w+\))? # ASCII representation of timezone in parens.
\s*$c C s� t j| �}|rl|j� }tj|d j� �d }t|d �|t|d �t|d �t|d �t|d �f}t|�S | j � } t
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ndS t
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a� Returns time in seconds since epoch of time represented by a string.
Return value is an integer.
None is returned if the format of str is unrecognized, the time is outside
the representable range, or the timezone string is not recognized. If the
string contains no timezone, UTC is assumed.
The timezone in the string may be numerical (like "-0800" or "+0100") or a
string timezone (like "UTC", "GMT", "BST" or "EST"). Currently, only the
timezone strings equivalent to UTC (zero offset) are known to the function.
The function loosely parses the following formats:
Wed, 09 Feb 1994 22:23:32 GMT -- HTTP format
Tuesday, 08-Feb-94 14:15:29 GMT -- old rfc850 HTTP format
Tuesday, 08-Feb-1994 14:15:29 GMT -- broken rfc850 HTTP format
09 Feb 1994 22:23:32 GMT -- HTTP format (no weekday)
08-Feb-94 14:15:29 GMT -- rfc850 format (no weekday)
08-Feb-1994 14:15:29 GMT -- broken rfc850 format (no weekday)
The parser ignores leading and trailing whitespace. The time may be
absent.
If the year is given with only 2 digits, the function will select the
century that makes the year closest to the current date.
r r r r; � � � N� )�STRICT_DATE_REr@ �groupsrI rJ rK rA �floatr, �lstrip�
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ra a� ^
(\d{4}) # year
[-\/]?
(\d\d?) # numerical month
[-\/]?
(\d\d?) # day
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(?::?(\d\d(?:\.\d*)?))? # optional seconds (and fractional)
)? # optional clock
\s*
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|Z|z)? # timezone (Z is "zero meridian", i.e. GMT)
\s*$c
C sd | j � } dgd \}}}}}}}tj| �}|dk rL|j� \}}}}}}}} ndS t|||||||�S )av
As for http2time, but parses the ISO 8601 formats:
1994-02-03 14:15:29 -0100 -- ISO 8601 format
1994-02-03 14:15:29 -- zone is optional
1994-02-03 -- only date
1994-02-03T14:15:29 -- Use T as separator
19940203T141529Z -- ISO 8601 compact format
19940203 -- only date
NrW )r[ � ISO_DATE_REr@ rY rS )
r_ r0 rP rQ rR r* r+ rC rE �_r r r �iso2time' s
rd c C s* | j d�\}}| jd|� | j|d� S )z)Return unmatched part of re.Match object.r N)�span�string)�match�start�endr r r � unmatchedH s rj z^\s*([^=\s;,]+)z&^\s*=\s*\"([^\"\\]*(?:\\.[^\"\\]*)*)\"z^\s*=\s*([^\s;,]*)z\\(.)c
C s< t | t� st�g }�x | D �]}|}g }x�|�r$tj|�}|r�t|�}|jd�}tj|�}|r�t|�}|jd�}tj d|�}n.t
j|�}|r�t|�}|jd�}|j � }nd}|j ||f� q,|j
� jd�r�|j
� dd� }|r�|j |� g }q,tjdd|�\}} | dk�s td|||f ��|}q,W |r |j |� q W |S ) am Parse header values into a list of lists containing key,value pairs.
The function knows how to deal with ",", ";" and "=" as well as quoted
values after "=". A list of space separated tokens are parsed as if they
were separated by ";".
If the header_values passed as argument contains multiple values, then they
are treated as if they were a single value separated by comma ",".
This means that this function is useful for parsing header fields that
follow this syntax (BNF as from the HTTP/1.1 specification, but we relax
the requirement for tokens).
headers = #header
header = (token | parameter) *( [";"] (token | parameter))
token = 1*<any CHAR except CTLs or separators>
separators = "(" | ")" | "<" | ">" | "@"
| "," | ";" | ":" | "\" | <">
| "/" | "[" | "]" | "?" | "="
| "{" | "}" | SP | HT
quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
qdtext = <any TEXT except <">>
quoted-pair = "\" CHAR
parameter = attribute "=" value
attribute = token
value = token | quoted-string
Each header is represented by a list of key/value pairs. The value for a
simple token (not part of a parameter) is None. Syntactically incorrect
headers will not necessarily be parsed as you would want.
This is easier to describe with some examples:
>>> split_header_words(['foo="bar"; port="80,81"; discard, bar=baz'])
[[('foo', 'bar'), ('port', '80,81'), ('discard', None)], [('bar', 'baz')]]
>>> split_header_words(['text/html; charset="iso-8859-1"'])
[[('text/html', None), ('charset', 'iso-8859-1')]]
>>> split_header_words([r'Basic realm="\"foo\bar\""'])
[[('Basic', None), ('realm', '"foobar"')]]
r z\1N�,z^[=\s;]*rV r z&split_header_words bug: '%s', '%s', %s)�
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'text/plain; charset="iso-8859-1"'
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'text/plain, charset="iso-8859-1"'
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>>> reach("www.acme.com")
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'acme.com'
>>> reach("acme.local")
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t| j�f� t|g�S )z�Return string representation of Cookie in the LWP cookie file format.
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The LWPCookieJar saves a sequence of "Set-Cookie3" lines.
"Set-Cookie3" is the format used by the libwww-perl library, not known
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doesn't lose information about RFC 2965 cookies.
Additional methods
as_lwp_str(ignore_discard=True, ignore_expired=True)
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�rF t� td|| f ��Y nX d S )Nz5%r does not look like a Set-Cookie3 (LWP) format filez Set-Cookie3:ry rx rz r� r� r� r� r� r� r� r� rM rV r Fr Tr� z&invalid Set-Cookie3 format file %r: %r)ry rx rz r� r� )r� r� r� r� r� r� rM )�readlinerk r@ r rM ru r r� r| rK r� rd r r� r� ra rv r] r )r� r rl rn ro �magicr r� �headerrP rQ �line�datarz r{ rR r� r� r� r� r� r� r� r� r� rc r r r rs c s�
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WARNING: you may want to backup your browser's cookies file if you use
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bugs in the past!
This class differs from CookieJar only in the format it uses to save and
load cookies to and from a file. This class uses the Mozilla/Netscape
`cookies.txt' format. lynx uses this file format, too.
Don't expect cookies saved while the browser is running to be noticed by
the browser (in fact, Mozilla on unix will overwrite your saved cookies if
you change them on disk while it's running; on Windows, you probably can't
save at all while the browser is running).
Note that the Mozilla/Netscape format will downgrade RFC2965 cookies to
Netscape cookies on saving.
In particular, the cookie version and port number information is lost,
together with information about whether or not Path, Port and Discard were
specified by the Set-Cookie2 (or Set-Cookie) header, and whether or not the
domain as set in the HTTP header started with a dot (yes, I'm aware some
domains in Netscape files start with a dot and some don't -- trust me, you
really don't want to know any more about this).
Note that though Mozilla and Netscape use the same format, they use
slightly different headers. The class saves cookies using the Netscape
header by default (Mozilla can cope with that).
z #( Netscape)? HTTP Cookie Filezr# Netscape HTTP Cookie File
# http://curl.haxx.se/rfc/cookie_spec.html
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HTTP/1.1 client library
<intro stuff goes here>
<other stuff, too>
HTTPConnection goes through a number of "states", which define when a client
may legally make another request or fetch the response for a particular
request. This diagram details these state transitions:
(null)
|
| HTTPConnection()
v
Idle
|
| putrequest()
v
Request-started
|
| ( putheader() )* endheaders()
v
Request-sent
|\_____________________________
| | getresponse() raises
| response = getresponse() | ConnectionError
v v
Unread-response Idle
[Response-headers-read]
|\____________________
| |
| response.read() | putrequest()
v v
Idle Req-started-unread-response
______/|
/ |
response.read() | | ( putheader() )* endheaders()
v v
Request-started Req-sent-unread-response
|
| response.read()
v
Request-sent
This diagram presents the following rules:
-- a second request may not be started until {response-headers-read}
-- a response [object] cannot be retrieved until {request-sent}
-- there is no differentiation between an unread response body and a
partially read response body
Note: this enforcement is applied by the HTTPConnection class. The
HTTPResponse class does not enforce this state machine, which
implies sophisticated clients may accelerate the request/response
pipeline. Caution should be taken, though: accelerating the states
beyond the above pattern may imply knowledge of the server's
connection-close behavior for certain requests. For example, it
is impossible to tell whether the server will close the connection
UNTIL the response headers have been read; this means that further
requests cannot be placed into the pipeline until it is known that
the server will NOT be closing the connection.
Logical State __state __response
------------- ------- ----------
Idle _CS_IDLE None
Request-started _CS_REQ_STARTED None
Request-sent _CS_REQ_SENT None
Unread-response _CS_IDLE <response_class>
Req-started-unread-response _CS_REQ_STARTED <response_class>
Req-sent-unread-response _CS_REQ_SENT <response_class>
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length in response to the FTP retrieval request. A
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FileDialoga� Standard file selection dialog -- no checks on selected file.
Usage:
d = FileDialog(master)
fname = d.go(dir_or_file, pattern, default, key)
if fname is None: ...canceled...
else: ...open file...
All arguments to go() are optional.
The 'key' argument specifies a key in the global dictionary
'dialogstates', which keeps track of the values for the directory
and pattern arguments, overriding the values passed in (it does
not keep track of the default argument!). If no key is specified,
the dialog keeps no memory of previous state. Note that memory is
kept even when the dialog is canceled. (All this emulates the
behavior of the Macintosh file selection dialogs.)
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krTe� dS )aF Drag-and-drop support for Tkinter.
This is very preliminary. I currently only support dnd *within* one
application, between different windows (or within the same window).
I am trying to make this as generic as possible -- not dependent on
the use of a particular widget or icon type, etc. I also hope that
this will work with Pmw.
To enable an object to be dragged, you must create an event binding
for it that starts the drag-and-drop process. Typically, you should
bind <ButtonPress> to a callback function that you write. The function
should call Tkdnd.dnd_start(source, event), where 'source' is the
object to be dragged, and 'event' is the event that invoked the call
(the argument to your callback function). Even though this is a class
instantiation, the returned instance should not be stored -- it will
be kept alive automatically for the duration of the drag-and-drop.
When a drag-and-drop is already in process for the Tk interpreter, the
call is *ignored*; this normally averts starting multiple simultaneous
dnd processes, e.g. because different button callbacks all
dnd_start().
The object is *not* necessarily a widget -- it can be any
application-specific object that is meaningful to potential
drag-and-drop targets.
Potential drag-and-drop targets are discovered as follows. Whenever
the mouse moves, and at the start and end of a drag-and-drop move, the
Tk widget directly under the mouse is inspected. This is the target
widget (not to be confused with the target object, yet to be
determined). If there is no target widget, there is no dnd target
object. If there is a target widget, and it has an attribute
dnd_accept, this should be a function (or any callable object). The
function is called as dnd_accept(source, event), where 'source' is the
object being dragged (the object passed to dnd_start() above), and
'event' is the most recent event object (generally a <Motion> event;
it can also be <ButtonPress> or <ButtonRelease>). If the dnd_accept()
function returns something other than None, this is the new dnd target
object. If dnd_accept() returns None, or if the target widget has no
dnd_accept attribute, the target widget's parent is considered as the
target widget, and the search for a target object is repeated from
there. If necessary, the search is repeated all the way up to the
root widget. If none of the target widgets can produce a target
object, there is no target object (the target object is None).
The target object thus produced, if any, is called the new target
object. It is compared with the old target object (or None, if there
was no old target widget). There are several cases ('source' is the
source object, and 'event' is the most recent event object):
- Both the old and new target objects are None. Nothing happens.
- The old and new target objects are the same object. Its method
dnd_motion(source, event) is called.
- The old target object was None, and the new target object is not
None. The new target object's method dnd_enter(source, event) is
called.
- The new target object is None, and the old target object is not
None. The old target object's method dnd_leave(source, event) is
called.
- The old and new target objects differ and neither is None. The old
target object's method dnd_leave(source, event), and then the new
target object's method dnd_enter(source, event) is called.
Once this is done, the new target object replaces the old one, and the
Tk mainloop proceeds. The return value of the methods mentioned above
is ignored; if they raise an exception, the normal exception handling
mechanisms take over.
The drag-and-drop processes can end in two ways: a final target object
is selected, or no final target object is selected. When a final
target object is selected, it will always have been notified of the
potential drop by a call to its dnd_enter() method, as described
above, and possibly one or more calls to its dnd_motion() method; its
dnd_leave() method has not been called since the last call to
dnd_enter(). The target is notified of the drop by a call to its
method dnd_commit(source, event).
If no final target object is selected, and there was an old target
object, its dnd_leave(source, event) method is called to complete the
dnd sequence.
Finally, the source object is notified that the drag-and-drop process
is over, by a call to source.dnd_end(target, event), specifying either
the selected target object, or None if no target object was selected.
The source object can use this to implement the commit action; this is
sometimes simpler than to do it in the target's dnd_commit(). The
target's dnd_commit() method could then simply be aliased to
dnd_leave().
At any time during a dnd sequence, the application can cancel the
sequence by calling the cancel() method on the object returned by
dnd_start(). This will call dnd_leave() if a target is currently
active; it will never call dnd_commit().
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exists -- does a named font by this name already exist?
Creates a new named font if False, points to the existing font if True.
Raises _tkinter.TclError if the assertion is false.
the following are ignored if font is specified:
family -- font 'family', e.g. Courier, Times, Helvetica
size -- font size in points
weight -- font thickness: NORMAL, BOLD
slant -- font slant: ROMAN, ITALIC
underline -- font underlining: false (0), true (1)
overstrike -- font strikeout: false (0), true (1)
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This module also presents tk common file dialogues, it provides interfaces
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tixCommanda� The tix commands provide access to miscellaneous elements
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to the application as a whole, or to a screen or
display, rather than to a particular window.
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that supports the self.tk.call method.
c C s | j �dd|�S )a� Tix maintains a list of directories under which
the tix_getimage and tix_getbitmap commands will
search for image files. The standard bitmap directory
is $TIX_LIBRARY/bitmaps. The addbitmapdir command
adds directory into this list. By using this
command, the image files of an applications can
also be located using the tix_getimage or tix_getbitmap
command.
�tixZ addbitmapdir��tk�call)�selfZ directory� r �#/usr/lib64/python3.8/tkinter/tix.py�tix_addbitmapdirR s
ztixCommand.tix_addbitmapdirc C s | j �dd|�S )z�Returns the current value of the configuration
option given by option. Option may be any of the
options described in the CONFIGURATION OPTIONS section.
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context. If no option is specified, returns a dictionary all of the
available options. If option is specified with no value, then the
command returns a list describing the one named option (this list
will be identical to the corresponding sublist of the value
returned if no option is specified). If one or more option-value
pairs are specified, then the command modifies the given option(s)
to have the given value(s); in this case the command returns an
empty string. Option may be any of the configuration options.
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tix FileSelectDialog or tixExFileSelectDialog.
Nr Z
filedialogr )r Zdlgclassr r r �tix_filedialog{ s ztixCommand.tix_filedialogc C s | j �dd|�S )a� Locates a bitmap file of the name name.xpm or name in one of the
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bitmap files in your application. When successful, it returns the
complete pathname of the bitmap file, prefixed with the character
'@'. The returned value can be used to configure the -bitmap
option of the TK and Tix widgets.
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tix_getbitmap� s ztixCommand.tix_getbitmapc C s | j �dd|�S )a� Locates an image file of the name name.xpm, name.xbm or name.ppm
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above). If more than one file with the same name (but different
extensions) exist, then the image type is chosen according to the
depth of the X display: xbm images are chosen on monochrome
displays and color images are chosen on color displays. By using
tix_ getimage, you can avoid hard coding the pathnames of the
image files in your application. When successful, this command
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configure the -image option of the Tk and Tix widgets.
r Zgetimager r+ r r r � tix_getimage� s ztixCommand.tix_getimagec C s | j �ddd|�S )a@ Gets the options maintained by the Tix
scheme mechanism. Available options include:
active_bg active_fg bg
bold_font dark1_bg dark1_fg
dark2_bg dark2_fg disabled_fg
fg fixed_font font
inactive_bg inactive_fg input1_bg
input2_bg italic_font light1_bg
light1_fg light2_bg light2_fg
menu_font output1_bg output2_bg
select_bg select_fg selector
r r �getr r+ r r r �tix_option_get� s ztixCommand.tix_option_getc C s2 |dk r | j �dd|||�S | j �dd||�S dS )a� Resets the scheme and fontset of the Tix application to
newScheme and newFontSet, respectively. This affects only those
widgets created after this call. Therefore, it is best to call the
resetoptions command before the creation of any widgets in a Tix
application.
The optional parameter newScmPrio can be given to reset the
priority level of the Tk options set by the Tix schemes.
Because of the way Tk handles the X option database, after Tix has
been has imported and inited, it is not possible to reset the color
schemes and font sets using the tix config command. Instead, the
tix_resetoptions command must be used.
Nr Z resetoptionsr )r Z newSchemeZ
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newScmPrior r r �tix_resetoptions� s ztixCommand.tix_resetoptions)N)N)N) �__name__�
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r c @ s" e Zd ZdZddd�Zdd� ZdS ) �Tkz{Toplevel widget of Tix which represents mostly the main window
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given as a 'config' command later.
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child widgets created automatically by a Tix mega-widget. The Tk call
to create these widgets is therefore bypassed in TixWidget.__init__
Both options are for use by subclasses only.
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widgetName�Widget�_setupr r rD rE �subwidget_list) r �masterr` Zstatic_optionsr' r( Zextra�k�vr r r r9 s$ zTixWidget.__init__c C s || j kr| j | S t|��d S rF )rc �AttributeErrorr+ r r r � __getattr__G s
zTixWidget.__getattr__c C s | j �d| j|� dS )z1Set a variable without calling its action routineZ tixSetSilentNrM )r rJ r r r �
set_silentL s zTixWidget.set_silentc C sD | � |�}|s$td| d | j ��|t| j�d d� }| �|�S )zSReturn the named subwidget (which must have been created by
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r* Y dS X dS )z7Get a subwidget name (returns a String, not a Widget !)rp N)r r rD rl r+ r r r rk i s zTixWidget._subwidget_namec C s< z | j �| jdd�}| j �|�W S tk
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subwidgetsz-allN)r r rD rP rl )r rQ r r r rq p s
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zTixWidget.config_allc K st |s| }|r |r t ||f�}n|r&|}d}|�� D ]*\}}t|�rL| �|�}|d| |f }q2|j�dd|f| �S )Nr r! r �create)r r_ �callable� _registerr r )r Zimgtyper' rd r( r\ re rf r r r � image_create� s
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of this)rj c
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�zDisplayStyle.__init__c C s | j S rF )r� r? r r r �__str__� s zDisplayStyle.__str__c C sH |r|rt ||f�}n|r |}d}|�� D ]\}}|d| |f }q*|S )Nr r! )r r_ )r r' r( Zoptsre rf r r r r% � s zDisplayStyle._optionsc C s | j �| jd� d S �Nrz �r r r� r? r r r rz � s zDisplayStyle.deletec C s | j �| jdd| |� d S )Nr �-%sr� rH r r r rK � s zDisplayStyle.__setitem__c K s | j | jdf| �||��� S )Nr )r" r� r% r& r r r rE � s �
�zDisplayStyle.configc C s | j �| jdd| �S )Nr r� r� )r rI r r r � __getitem__� s zDisplayStyle.__getitem__) r2 r3 r4 r5 r9 r� r% rz rK rE r� r r r r r� � s
r� c @ s2 e Zd ZdZdi fdd�Zi fdd�Zdd� ZdS ) �BalloonzBalloon help widget.
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label Label
message MessageNc K sN dddddg}t �| |d|||� t| ddd �| jd< t| d
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r� c @ s2 e Zd ZdZdi fdd�Zi fdd�Zdd� ZdS ) � ButtonBoxzgButtonBox - A container for pushbuttons.
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entry Entry
arrow Button
slistbox ScrolledListBox
tick Button
cross Button : present if created with the fancy optionNc K s� t �| |dddddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d �| jd < z$t| d
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Subwidget Class
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incr Button
decr Button
entry Entry
label LabelNc K sZ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ
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zControl.__init__c C s | j �| jd� d S )Nr� rM r? r r r � decremento s zControl.decrementc C s | j �| jd� d S )Nr� rM r? r r r � incrementr s zControl.incrementc C s | j �| jd� d S r� rM r? r r r r� u s zControl.invokec C s | j �| jd� d S )N�updaterM r? r r r r� x s zControl.update) r2 r3 r4 r5 r9 r� r� r� r� r r r r r� Z s
r� c @ s$ e Zd ZdZi fdd�Zdd� ZdS )�DirListaR DirList - displays a list view of a directory, its previous
directories and its sub-directories. The user can choose one of
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hlist HList
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DirList.chdirN�r2 r3 r4 r5 r9 r� r r r r r� { s r� c @ s$ e Zd ZdZi fdd�Zdd� ZdS )�DirTreea� DirTree - Directory Listing in a hierarchical view.
Displays a tree view of a directory, its previous directories and its
sub-directories. The user can choose one of the directories displayed
in the list or change to another directory.
Subwidget Class
--------- -----
hlist HList
hsb Scrollbar
vsb Scrollbarc K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ
tixDirTreer\ r� r� r� r� r� r r r r9 � s zDirTree.__init__c C s | j �| jd|� d S r� rM r� r r r r� � s z
DirTree.chdirNr� r r r r r� � s r� c @ s e Zd ZdZi fdd�ZdS )� DirSelectBoxa� DirSelectBox - Motif style file select box.
It is generally used for
the user to choose a file. FileSelectBox stores the files mostly
recently selected into a ComboBox widget so that they can be quickly
selected again.
Subwidget Class
--------- -----
selection ComboBox
filter ComboBox
dirlist ScrolledListBox
filelist ScrolledListBoxc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZtixDirSelectBoxr\ �dirlist�dircbx)r[ r9 �
_dummyDirListrc �_dummyFileComboBoxr� r r r r9 � s zDirSelectBox.__init__N�r2 r3 r4 r5 r9 r r r r r� � s
r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �ExFileSelectBoxa� ExFileSelectBox - MS Windows style file select box.
It provides a convenient method for the user to select files.
Subwidget Class
--------- -----
cancel Button
ok Button
hidden Checkbutton
types ComboBox
dir ComboBox
file ComboBox
dirlist ScrolledListBox
filelist ScrolledListBoxc K s� t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d �| jd < t| d
�| jd
< d S ) NZtixExFileSelectBoxr\ �cancel�ok�hidden�typesr� r� �file�filelist)r[ r9 r� rc �_dummyCheckbutton�_dummyComboBoxr� r� r� r r r r9 � s zExFileSelectBox.__init__c C s | j �| jd� d S �N�filterrM r? r r r r� � s zExFileSelectBox.filterc C s | j �| jd� d S r� rM r? r r r r� � s zExFileSelectBox.invokeN)r2 r3 r4 r5 r9 r� r� r r r r r� � s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �DirSelectDialoga# The DirSelectDialog widget presents the directories in the file
system in a dialog window. The user can use this dialog window to
navigate through the file system to select the desired directory.
Subwidgets Class
---------- -----
dirbox DirSelectDialogc K s* t �| |ddg||� t| d�| jd< d S )NZtixDirSelectDialogr\ Zdirbox)r[ r9 �_dummyDirSelectBoxrc r� r r r r9 � s
�zDirSelectDialog.__init__c C s | j �| jd� d S �N�popuprM r? r r r r� � s zDirSelectDialog.popupc C s | j �| jd� d S �N�popdownrM r? r r r r� � s zDirSelectDialog.popdownN�r2 r3 r4 r5 r9 r� r� r r r r r� � s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �ExFileSelectDialogz�ExFileSelectDialog - MS Windows style file select dialog.
It provides a convenient method for the user to select files.
Subwidgets Class
---------- -----
fsbox ExFileSelectBoxc K s* t �| |ddg||� t| d�| jd< d S )NZtixExFileSelectDialogr\ �fsbox)r[ r9 �_dummyExFileSelectBoxrc r� r r r r9 � s
�zExFileSelectDialog.__init__c C s | j �| jd� d S r� rM r? r r r r� s zExFileSelectDialog.popupc C s | j �| jd� d S r� rM r? r r r r� s zExFileSelectDialog.popdownNr� r r r r r� � s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �
FileSelectBoxa� ExFileSelectBox - Motif style file select box.
It is generally used for
the user to choose a file. FileSelectBox stores the files mostly
recently selected into a ComboBox widget so that they can be quickly
selected again.
Subwidget Class
--------- -----
selection ComboBox
filter ComboBox
dirlist ScrolledListBox
filelist ScrolledListBoxc K sZ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixFileSelectBoxr\ r� r� r� � selection)r[ r9 r� rc r� r� r r r r9 s
zFileSelectBox.__init__c C s | j �| jd� d S r� rM r? r r r � apply_filter s zFileSelectBox.apply_filterc C s | j �| jd� d S r� rM r? r r r r� s zFileSelectBox.invokeN)r2 r3 r4 r5 r9 r� r� r r r r r� s
r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �FileSelectDialogz�FileSelectDialog - Motif style file select dialog.
Subwidgets Class
---------- -----
btns StdButtonBox
fsbox FileSelectBoxc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZtixFileSelectDialogr\ Zbtnsr� )r[ r9 �_dummyStdButtonBoxrc �_dummyFileSelectBoxr� r r r r9 , s
�zFileSelectDialog.__init__c C s | j �| jd� d S r� rM r? r r r r� 2 s zFileSelectDialog.popupc C s | j �| jd� d S r� rM r? r r r r� 5 s zFileSelectDialog.popdownNr� r r r r r� # s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) � FileEntrya_ FileEntry - Entry field with button that invokes a FileSelectDialog.
The user can type in the filename manually. Alternatively, the user can
press the button widget that sits next to the entry, which will bring
up a file selection dialog.
Subwidgets Class
---------- -----
button Button
entry Entryc K s< t �| |dddg||� t| d�| jd< t| d�| jd< d S )NZ tixFileEntryZ
dialogtyper\ Zbuttonr� )r[ r9 r� rc r� r� r r r r9 D s
�zFileEntry.__init__c C s | j �| jd� d S r� rM r? r r r r� J s zFileEntry.invokec C s d S rF r r? r r r � file_dialogM s zFileEntry.file_dialogN)r2 r3 r4 r5 r9 r� r� r r r r r� 8 s r� c @ s� e Zd ZdZdi fdd�Zi fdd�Zdi fdd�Zd d
� Zd d � Zdldd�Z dd� Z
dd� Z dd� Z dd� Z
dd� Zdd� Zd d � Zd d � Zi fd d!�Zi fd"d#�Zd$d%� Zd&d'� ZeZd(d)� Zd*d+� Zd,d-� Zi fd.d/�Zi fd0d1�Zd2d3� Z d4d5� Z d6d7� Z d8d9� Z d:d;� Z d<d=� Z!dmd>d?�Z"d@dA� Z#dBdC� Z$dDdE� Z%dFdG� Z&dHdI� Z'dJdK� Z(dLdM� Z)dNdO� Z*dPdQ� Z+dRdS� Z,i fdTdU�Z-i fdVdW�Z.dXdY� Z/dZd[� Z0d\d]� Z1i fd^d_�Z2d`da� Z3dbdc� Z4i fddde�Z5dfdg� Z6dndhdi�Z7djdk� Z8dS )o�HLista HList - Hierarchy display widget can be used to display any data
that have a hierarchical structure, for example, file system directory
trees. The list entries are indented and connected by branch lines
according to their places in the hierarchy.
Subwidgets - NoneNc K s t �| |dddg||� d S )NZtixHList�columnsr\ r� r� r r r r9 Y s
�zHList.__init__c K s | j j| jd|f| �||��� S �Nr� rC �r r� r' r( r r r r� ] s z HList.addc K s( |sd}| j j| jd|f| �||��� S )Nr= ZaddchildrC )r r� r' r( r r r � add_child` s �
�zHList.add_childc C s | j �| jdd|� d S �N�anchor�setrM �r r� r r r �
anchor_setf s zHList.anchor_setc C s | j �| jdd� d S �Nr� �clearrM r? r r r � anchor_cleari s zHList.anchor_clearr c C s6 |s| j �| jdd||�S | j �| jdd|d|�S d S )Nr �widthz-charrM )r �colr �charsr r r � column_widthl s �zHList.column_widthc C s | j �| jdd� d S )Nrz �allrM r? r r r �
delete_alls s zHList.delete_allc C s | j �| jdd|� d S )Nrz r� rM r� r r r � delete_entryv s zHList.delete_entryc C s | j �| jdd|� d S )Nrz Z
offspringsrM r� r r r �delete_offspringsy s zHList.delete_offspringsc C s | j �| jdd|� d S )Nrz ZsiblingsrM r� r r r �delete_siblings| s zHList.delete_siblingsc C s | j �| jdd|� d S �N�dragsiter� rM r� r r r � dragsite_set s zHList.dragsite_setc C s | j �| jdd� d S �Nr r rM r? r r r �dragsite_clear� s zHList.dragsite_clearc C s | j �| jdd|� d S �N�dropsiter� rM r� r r r � dropsite_set� s zHList.dropsite_setc C s | j �| jdd� d S �Nr r rM r? r r r �dropsite_clear� s zHList.dropsite_clearc K s& | j j| jdd|f| �||��� d S )N�headerrv rC �r r r' r( r r r �
header_create� s zHList.header_createc K s@ |d kr| � | jdd|�S | jj| jdd|f| �||��� d S )Nr r �r" rD r r r% r r r r �header_configure� s
�zHList.header_configurec C s | j �| jdd||�S )Nr r rM )r r �optr r r � header_cget� s zHList.header_cgetc C s | j �| j �| jdd|��S )Nr Zexist)r Z
getbooleanr rD �r r r r r �
header_exists� s zHList.header_existsc C s | j �| jdd|� d S )Nr rz rM r r r r �
header_delete� s zHList.header_deletec C s | j �| jdd|�S )Nr �sizerM r r r r � header_size� s zHList.header_sizec C s | j �| jdd|� d S )N�hider� rM r� r r r �
hide_entry� s zHList.hide_entryc K s& | j j| jdd|f| �||��� d S )N� indicatorrv rC r� r r r �indicator_create� s �
�zHList.indicator_createc K s@ |d kr| � | jdd|�S | jj| jdd|f| �||��� d S )Nr# r r r� r r r �indicator_configure� s � �
�zHList.indicator_configurec C s | j �| jdd||�S )Nr# r rM �r r� r r r r �indicator_cget� s zHList.indicator_cgetc C s | j �| jdd|�S )Nr# �existsrM r� r r r �indicator_exists� s zHList.indicator_existsc C s | j �| jdd|� d S )Nr# rz rM r� r r r �indicator_delete� s zHList.indicator_deletec C s | j �| jdd|�S )Nr# r rM r� r r r �indicator_size� s zHList.indicator_sizec C s | j �| jdd�S �NrT r� rM r? r r r � info_anchor� s zHList.info_anchorc C s | � | j�| jdd|��p d S �NrT Zbbox)�_getintsr r rD r� r r r � info_bbox� s
��zHList.info_bboxc C s | j �| jdd|�}| j �|�S )NrT r� �r r rD rP )r r� r� r r r �
info_children� s zHList.info_childrenc C s | j �| jdd|�S )NrT �datarM r� r r r � info_data� s zHList.info_datac C s | j �| jdd�S )NrT r rM r? r r r �
info_dragsite� s zHList.info_dragsitec C s | j �| jdd�S )NrT r rM r? r r r �
info_dropsite� s zHList.info_dropsitec C s | j �| jdd|�S )NrT r( rM r� r r r � info_exists� s zHList.info_existsc C s | j �| jdd|�S )NrT r� rM r� r r r � info_hidden� s zHList.info_hiddenc C s | j �| jdd|�S )NrT �nextrM r� r r r � info_next� s zHList.info_nextc C s | j �| jdd|�S )NrT r� rM r� r r r � info_parent� s zHList.info_parentc C s | j �| jdd|�S )NrT �prevrM r� r r r � info_prev� s zHList.info_prevc C s | j �| jdd�}| j �|�S �NrT r� r1 r� r r r �info_selection� s zHList.info_selectionc C s | j �| jdd|||�S )N�itemr rM )r r� r r r r r � item_cget� s zHList.item_cgetc K sD |d kr | � | jdd||�S | jj| jdd||f| �||��� d S )Nr@ r r �r r� r r' r( r r r �item_configure� s
�zHList.item_configurec K s( | j j| jdd||f| �||��� d S )Nr@ rv rC rB r r r � item_create� s �
�zHList.item_createc C s | j �| jdd||�S )Nr@ r( rM �r r� r r r r � item_exists� s zHList.item_existsc C s | j �| jdd||� d S )Nr@ rz rM rE r r r � item_delete� s zHList.item_deletec C s | j �| jd||�S )N� entrycgetrM r& r r r rH � s zHList.entrycgetc K s< |d kr| � | jd|�S | jj| jd|f| �||��� d S �N�entryconfigurer r� r r r rJ � s
�zHList.entryconfigurec C s | j �| jd|�S �N�nearestrM )r rR r r r rL s z
HList.nearestc C s | j �| jd|� d S �N�seerM r� r r r rN s z HList.seec K s$ | j j| jddf| �||��� d S �Nr� r rC r& r r r �selection_clear s zHList.selection_clearc C s | j �| jdd|�S �Nr� ZincludesrM r� r r r �selection_includes
s zHList.selection_includesc C s | j �| jdd||� d S �Nr� r� rM �r �firstZlastr r r �
selection_set
s zHList.selection_setc C s | j �| jdd|�S )N�showr� rM r� r r r �
show_entry s zHList.show_entry)r NN)N)N)9r2 r3 r4 r5 r9 r� r� r� r r r r r r
r
r r r r r r r Z header_existr r r" r$ r% r' r) r* r+ r- r0 r2 r4 r5 r6 r7 r8 r: r; r= r? rA rC rD rF rG rH rJ rL rN rP rR rV rX r r r r r� Q sl
r� c @ s e Zd ZdZdi fdd�ZdS )� InputOnlyz?InputOnly - Invisible widget. Unix only.
Subwidgets - NoneNc K s t �| |dd ||� d S )NZ tixInputOnlyr� r� r r r r9 s zInputOnly.__init__r� r r r r rY s rY c @ s e Zd ZdZdi fdd�ZdS )�
LabelEntrya LabelEntry - Entry field with label. Packages an entry widget
and a label into one mega widget. It can be used to simplify the creation
of ``entry-form'' type of interface.
Subwidgets Class
---------- -----
label Label
entry EntryNc K s< t �| |dddg||� t| d�| jd< t| d�| jd< d S )NZ
tixLabelEntry� labelsider\ r� r� )r[ r9 r� rc r� r� r r r r9 % s
�zLabelEntry.__init__r� r r r r rZ s rZ c @ s e Zd ZdZdi fdd�ZdS )�
LabelFrameae LabelFrame - Labelled Frame container. Packages a frame widget
and a label into one mega widget. To create widgets inside a
LabelFrame widget, one creates the new widgets relative to the
frame subwidget and manage them inside the frame subwidget.
Subwidgets Class
---------- -----
label Label
frame FrameNc K s< t �| |dddg||� t| d�| jd< t| d�| jd< d S )NZ
tixLabelFramer[ r\ r� �frame)r[ r9 r� rc � _dummyFramer� r r r r9 6 s
�zLabelFrame.__init__r� r r r r r\ + s
r\ c @ s@ e Zd ZdZi fdd�Zi fdd�Zdd� Zdd � Zd
d � Zd S )
� ListNoteBooka A ListNoteBook widget is very similar to the TixNoteBook widget:
it can be used to display many windows in a limited space using a
notebook metaphor. The notebook is divided into a stack of pages
(windows). At one time only one of these pages can be shown.
The user can navigate through these pages by
choosing the name of the desired page in the hlist subwidget.c K sN t �| |ddg||� t| ddd�| jd< t| d�| jd< t| d�| jd< d S )NZtixListNoteBookr\ Zpaner r� r� Zshlist)r[ r9 �_dummyPanedWindowrc r� �_dummyScrolledHListr� r r r r9 E s � zListNoteBook.__init__c K s: | j j| jd|f| �||��� t| |�| j|< | j| S r� �r r rD r% r| rc �r r, r' r( r r r r� M s zListNoteBook.addc C s
| � |�S rF �rp r+ r r r �pageR s zListNoteBook.pagec C s: | j �| j �| jd��}g }|D ]}|�| �|�� q |S �N�pages�r rP r rD r] rp �r rr ZretrQ r r r rg U s
zListNoteBook.pagesc C s | j �| jd|� d S �N�raiserM r+ r r r �
raise_page] s zListNoteBook.raise_pageN) r2 r3 r4 r5 r9 r� re rg rl r r r r r_ = s r_ c @ s e Zd ZdZdi fdd�ZdS )�MeterzuThe Meter widget can be used to show the progress of a background
job which may take a long time to execute.
Nc K s t �| |ddg||� d S )NZtixMeterr\ r� r� r r r r9 e s
�zMeter.__init__r� r r r r rm ` s rm c @ sR e Zd ZdZdi fdd�Zi fdd�Zdd� Zd d
� Zd d � Zd
d� Z dd� Z
dS )�NoteBookz�NoteBook - Multi-page container widget (tabbed notebook metaphor).
Subwidgets Class
---------- -----
nbframe NoteBookFrame
<pages> page widgets added dynamically with the add methodNc K s. t �| |ddg||� t| ddd�| jd< d S )NZ tixNoteBookr\ Znbframer r� )r[ r9 r| rc r� r r r r9 q s �zNoteBook.__init__c K s: | j j| jd|f| �||��� t| |�| j|< | j| S r� rb rc r r r r� v s z NoteBook.addc C s, | j �| jd|� | j| �� | j|= d S r� �r r rD rc r> r+ r r r rz { s zNoteBook.deletec C s
| � |�S rF rd r+ r r r re � s z
NoteBook.pagec C s: | j �| j �| jd��}g }|D ]}|�| �|�� q |S rf rh ri r r r rg � s
zNoteBook.pagesc C s | j �| jd|� d S rj rM r+ r r r rl � s zNoteBook.raise_pagec C s | j �| jd�S )N�raisedrM r? r r r rp � s zNoteBook.raised) r2 r3 r4 r5 r9 r� rz re rg rl rp r r r r rn i s rn c @ s e Zd ZdS )�
NoteBookFrameN)r2 r3 r4 r r r r rq � s rq c @ sL e Zd ZdZi fdd�Zi fdd�Zi fdd�Zdd � Zd
d � Zd d
� Z dS )�
OptionMenuz�OptionMenu - creates a menu button of options.
Subwidget Class
--------- -----
menubutton Menubutton
menu Menuc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZ
tixOptionMenur\ �
menubutton�menu�r[ r9 �_dummyMenubuttonrc �
_dummyMenur� r r r r9 � s zOptionMenu.__init__c K s& | j j| jdd|f| �||��� d S )Nr� �commandrC rc r r r � add_command� s zOptionMenu.add_commandc K s& | j j| jdd|f| �||��� d S )Nr� Z separatorrC rc r r r �
add_separator� s zOptionMenu.add_separatorc C s | j �| jd|� d S r� rM r+ r r r rz � s zOptionMenu.deletec C s | j �| jd|� d S )N�disablerM r+ r r r r{ � s zOptionMenu.disablec C s | j �| jd|� d S )N�enablerM r+ r r r r| � s zOptionMenu.enableN)
r2 r3 r4 r5 r9 ry rz rz r{ r| r r r r rr � s rr c @ sT e Zd ZdZi fdd�Zi fdd�Zdd� Zdd � Zd
d � Zi fd d
�Z dd� Z
dS )� PanedWindowa� PanedWindow - Multi-pane container widget
allows the user to interactively manipulate the sizes of several
panes. The panes can be arranged either vertically or horizontally.The
user changes the sizes of the panes by dragging the resize handle
between two panes.
Subwidgets Class
---------- -----
<panes> g/p widgets added dynamically with the add method.c K s t �| |dddg||� d S )NZtixPanedWindowr� r\ r� r� r r r r9 � s zPanedWindow.__init__c K s> | j j| jd|f| �||��� t| |dd�| j|< | j| S )Nr� r )r rb rc r r r r� � s
� zPanedWindow.addc C s, | j �| jd|� | j| �� | j|= d S r� ro r+ r r r rz � s zPanedWindow.deletec C s | j �| jd|� d S )NrN rM r+ r r r rN � s zPanedWindow.forgetc C s | j �| jd||�S )N�panecgetrM r& r r r r~ � s zPanedWindow.panecgetc K s< |d kr| � | jd|�S | jj| jd|f| �||��� d S )N�
paneconfigurer r� r r r r � s zPanedWindow.paneconfigurec s* � j �� j �� jd��}� fdd�|D �S )N�panesc s g | ]}� � |��qS r rd rV r? r r rX � s z%PanedWindow.panes.<locals>.<listcomp>rZ )r rr r r? r r� � s zPanedWindow.panesN) r2 r3 r4 r5 r9 r� rz rN r~ r r� r r r r r} � s
r} c @ s4 e Zd ZdZi fdd�Zdd� Zdd� Zdd � Zd
S ) � PopupMenua PopupMenu widget can be used as a replacement of the tk_popup command.
The advantage of the Tix PopupMenu widget is it requires less application
code to manipulate.
Subwidgets Class
---------- -----
menubutton Menubutton
menu Menuc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZ tixPopupMenur\ rs rt ru r� r r r r9 � s zPopupMenu.__init__c C s | j �| jd|j� d S )Nr� rM r� r r r r� � s zPopupMenu.bind_widgetc C s | j �| jd|j� d S r� rM r� r r r r� � s zPopupMenu.unbind_widgetc C s | j �| jd|j||� d S )NZpostrM )r r� rQ rR r r r � post_widget� s zPopupMenu.post_widgetN)r2 r3 r4 r5 r9 r� r� r� r r r r r� � s
r� c @ s< e Zd ZdZi fdd�Zdd� Zdd� Zdd � Zd
d � Zd S )
� ResizeHandlez;Internal widget to draw resize handles on Scrolled widgets.c K s. ddddddddd g }t �| |d
|||� d S ) Nr\ rx ZcursorfgZcursorbgZ
handlesizeZ hintcolorZ hintwidthrQ rR ZtixResizeHandler� )r rd r' r( �flagsr r r r9 � s �
�zResizeHandle.__init__c C s | j �| jd|j� d S )NZ attachwidgetrM r� r r r �
attach_widget s zResizeHandle.attach_widgetc C s | j �| jd|j� d S )NZ detachwidgetrM r� r r r �
detach_widget s zResizeHandle.detach_widgetc C s | j �| jd|j� d S )Nr! rM r� r r r r! s zResizeHandle.hidec C s | j �| jd|j� d S )NrW rM r� r r r rW s zResizeHandle.showN) r2 r3 r4 r5 r9 r� r� r! rW r r r r r� � s
r� c @ s e Zd ZdZi fdd�ZdS )�
ScrolledHListz0ScrolledHList - HList with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledHListr\ r� r� r� r� r� r r r r9 s �zScrolledHList.__init__Nr� r r r r r� s r� c @ s e Zd ZdZi fdd�ZdS )�ScrolledListBoxz4ScrolledListBox - Listbox with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledListBoxr\ �listboxr� r� )r[ r9 �
_dummyListboxrc r� r� r r r r9 s zScrolledListBox.__init__Nr� r r r r r� s r� c @ s e Zd ZdZi fdd�ZdS )� ScrolledTextz.ScrolledText - Text with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledTextr\ r r� r� )r[ r9 �
_dummyTextrc r� r� r r r r9 % s zScrolledText.__init__Nr� r r r r r� ! s r� c @ s e Zd ZdZi fdd�ZdS )�
ScrolledTListz0ScrolledTList - TList with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledTListr\ Ztlistr� r� )r[ r9 � _dummyTListrc r� r� r r r r9 / s �zScrolledTList.__init__Nr� r r r r r� + s r� c @ s e Zd ZdZi fdd�ZdS )�ScrolledWindowz2ScrolledWindow - Window with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledWindowr\ r r� r� )r[ r9 r^ rc r� r� r r r r9 : s zScrolledWindow.__init__Nr� r r r r r� 6 s r� c @ s0 e Zd ZdZi fdd�Zi fdd�Zdd� ZdS ) �Selectz�Select - Container of button subwidgets. It can be used to provide
radio-box or check-box style of selection options for the user.
Subwidgets are buttons added dynamically using the add method.c
K s2 t �| |ddddddg||� t| d�| jd< d S )NZ tixSelectZ allowzero�radior� r[ r\ r� r� r� r r r r9 G s
� �zSelect.__init__c K s: | j j| jd|f| �||��� t| |�| j|< | j| S r� r� rc r r r r� N s z
Select.addc C s | j �| jd|� d S r� rM r+ r r r r� S s z
Select.invokeNr� r r r r r� @ s r� c @ s e Zd ZdZdi fdd�ZdS )�Shellz'Toplevel window.
Subwidgets - NoneNc K s t �| |dddg||� d S )NZtixShellr\ �titler� r� r r r r9 [ s zShell.__init__r� r r r r r� V s r� c @ s6 e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� ZdS ) � DialogShellz�Toplevel window, with popup popdown and center methods.
It tells the window manager that it is a dialog window and should be
treated specially. The exact treatment depends on the treatment of
the window manager.
Subwidgets - NoneNc K s& t �| |ddddddddg||� d S ) NZtixDialogShellr\ r� ZmappedZ minheightZminwidthr� Z transientr� r� r r r r9 g s � �zDialogShell.__init__c C s | j �| jd� d S r� rM r? r r r r� n s zDialogShell.popdownc C s | j �| jd� d S r� rM r? r r r r� q s zDialogShell.popupc C s | j �| jd� d S )N�centerrM r? r r r r� t s zDialogShell.center)r2 r3 r4 r5 r9 r� r� r� r r r r r� ^ s
r� c @ s& e Zd ZdZdi fdd�Zdd� ZdS )� StdButtonBoxz@StdButtonBox - Standard Button Box (OK, Apply, Cancel and Help) Nc K s\ t �| |dddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixStdButtonBoxr� r\ r� �applyr� �help)r[ r9 r� rc r� r r r r9 z s
�zStdButtonBox.__init__c C s || j kr | j�| jd|� d S r� r� r+ r r r r� � s
zStdButtonBox.invoke)r2 r3 r4 r5 r9 r� r r r r r� w s r� c @ s� e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd d � Zd3d
d�Z dd� Z
dd� Z dd� Z dd� Z
i fdd�Zdd� Zdd � Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� Zd'd(� Zd)d*� Zd+d,� Zi fd-d.�Zd/d0� Zd4d1d2�ZdS )5�TLista� TList - Hierarchy display widget which can be
used to display data in a tabular format. The list entries of a TList
widget are similar to the entries in the Tk listbox widget. The main
differences are (1) the TList widget can display the list entries in a
two dimensional format and (2) you can use graphical images as well as
multiple colors and fonts for the list entries.
Subwidgets - NoneNc K s t �| |ddg||� d S )NZtixTListr\ r� r� r r r r9 � s zTList.__init__c C s | j �| jdd|� d S )N�activer� rM r� r r r �
active_set� s zTList.active_setc C s | j �| jdd� d S )Nr� r rM r? r r r � active_clear� s zTList.active_clearc C s | j �| jdd|� d S r� rM r� r r r r� � s zTList.anchor_setc C s | j �| jdd� d S r� rM r? r r r r � s zTList.anchor_clearc C s | j �| jd||� d S r� rM �r �from_�tor r r rz � s z TList.deletec C s | j �| jdd|� d S r rM r� r r r r
� s zTList.dragsite_setc C s | j �| jdd� d S r rM r? r r r r � s zTList.dragsite_clearc C s | j �| jdd|� d S r rM r� r r r r � s zTList.dropsite_setc C s | j �| jdd� d S r rM r? r r r r � s zTList.dropsite_clearc K s$ | j j| jd|f| �||��� d S r� rC )r r� r' r( r r r r� � s z TList.insertc C s | j �| jdd�S )NrT r� rM r? r r r � info_active� s zTList.info_activec C s | j �| jdd�S r, rM r? r r r r- � s zTList.info_anchorc C s | j �| jdd|�S )NrT ZdownrM r� r r r � info_down� s zTList.info_downc C s | j �| jdd|�S )NrT �leftrM r� r r r � info_left� s zTList.info_leftc C s | j �| jdd|�S )NrT �rightrM r� r r r �
info_right� s zTList.info_rightc C s | j �| jdd�}| j �|�S r> r1 r� r r r r? � s zTList.info_selectionc C s | j �| jdd�S )NrT r rM r? r r r � info_size� s zTList.info_sizec C s | j �| jdd|�S )NrT ZuprM r� r r r �info_up� s z
TList.info_upc C s | j �| jd||�S rK rM �r rQ rR r r r rL � s z
TList.nearestc C s | j �| jd|� d S rM rM r� r r r rN � s z TList.seec K s$ | j j| jddf| �||��� d S rO rC r& r r r rP � s zTList.selection_clearc C s | j �| jdd|�S rQ rM r� r r r rR � s zTList.selection_includesc C s | j �| jdd||� d S rS rM rT r r r rV � s zTList.selection_set)N)N) r2 r3 r4 r5 r9 r� r� r� r rz r
r r r r� r� r- r� r� r� r? r� r� rL rN rP rR rV r r r r r� � s2
r� c @ sH e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd d � Zddd�Z dS )�Treez�Tree - The tixTree widget can be used to display hierarchical
data in a tree form. The user can adjust
the view of the tree by opening or closing parts of the tree.Nc K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixTreer\ r� r� r� r� r� r r r r9 � s
�z
Tree.__init__c C s | j �| jd� dS �a This command calls the setmode method for all the entries in this
Tree widget: if an entry has no child entries, its mode is set to
none. Otherwise, if the entry has any hidden child entries, its mode is
set to open; otherwise its mode is set to close.� autosetmodeNrM r? r r r r� � s zTree.autosetmodec C s | j �| jd|� dS �z8Close the entry given by entryPath if its mode is close.�closeNrM �r � entrypathr r r r� � s z
Tree.closec C s | j �| jd|�S �z9Returns the current mode of the entry given by entryPath.�getmoderM r� r r r r� � s z Tree.getmodec C s | j �| jd|� dS �z6Open the entry given by entryPath if its mode is open.�openNrM r� r r r r� � s z Tree.open�nonec C s | j �| jd||� dS )a� This command is used to indicate whether the entry given by
entryPath has children entries and whether the children are visible. mode
must be one of open, close or none. If mode is set to open, a (+)
indicator is drawn next the entry. If mode is set to close, a (-)
indicator is drawn next the entry. If mode is set to none, no
indicators will be drawn for this entry. The default mode is none. The
open mode indicates the entry has hidden children and this entry can be
opened by the user. The close mode indicates that all the children of the
entry are now visible and the entry can be closed by the user.�setmodeNrM �r r� �moder r r r� � s
z Tree.setmode)r� )
r2 r3 r4 r5 r9 r� r� r� r� r� r r r r r� � s r� c @ sZ e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd d � Zddd�Z dd� Z
ddd�Z dS )� CheckListz�The CheckList widget
displays a list of items to be selected by the user. CheckList acts
similarly to the Tk checkbutton or radiobutton widgets, except it is
capable of handling many more items than checkbuttons or radiobuttons.
Nc K sL t �| |dddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ tixCheckListr\ r� r� r� r� r� r� r r r r9 s
�zCheckList.__init__c C s | j �| jd� dS r� rM r? r r r r� s zCheckList.autosetmodec C s | j �| jd|� dS r� rM r� r r r r� s zCheckList.closec C s | j �| jd|�S r� rM r� r r r r� s zCheckList.getmodec C s | j �| jd|� dS r� rM r� r r r r� $ s zCheckList.open�onc C s | j �| j �| jd|��S )z�Returns a list of items whose status matches status. If status is
not specified, the list of items in the "on" status will be returned.
Mode can be on, off, default� getselectionrZ )r r� r r r r� ( s zCheckList.getselectionc C s | j �| jd|�S )z(Returns the current status of entryPath.� getstatusrM r� r r r r� . s zCheckList.getstatusc C s | j �| jd||� dS )z~Sets the status of entryPath to be status. A bitmap will be
displayed next to the entry its status is on, off or default.� setstatusNrM r� r r r r� 2 s zCheckList.setstatus)r� )r� ) r2 r3 r4 r5 r9 r� r� r� r� r� r� r� r r r r r� s
r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF �r| r9 �r rd r, r~ r r r r9 > s z_dummyButton.__init__N)rj �r2 r3 r4 r9 r r r r r� = s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 B s z_dummyCheckbutton.__init__N)rj r� r r r r r� A s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 F s z_dummyEntry.__init__N)rj r� r r r r r� E s r� c @ s e Zd Zddd�ZdS )r^ rj c C s t �| |||� d S rF r� r� r r r r9 J s z_dummyFrame.__init__N)rj r� r r r r r^ I s r^ c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 N s z_dummyLabel.__init__N)rj r� r r r r r� M s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 R s z_dummyListbox.__init__N)rj r� r r r r r� Q s r� c @ s e Zd Zddd�ZdS )rw rj c C s t �| |||� d S rF r� r� r r r r9 V s z_dummyMenu.__init__N)rj r� r r r r rw U s rw c @ s e Zd Zddd�ZdS )rv rj c C s t �| |||� d S rF r� r� r r r r9 Z s z_dummyMenubutton.__init__N)rj r� r r r r rv Y s rv c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 ^ s z_dummyScrollbar.__init__N)rj r� r r r r r� ] s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 b s z_dummyText.__init__N)rj r� r r r r r� a s r� c @ s e Zd Zddd�ZdS )r� rj c C sD t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< d S )Nr� r� r� )r| r9 r� rc r� r� r r r r9 f s z _dummyScrolledListBox.__init__N)rj r� r r r r r� e s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 m s z_dummyHList.__init__N)rj r� r r r r r� l s r� c @ s e Zd Zddd�ZdS )ra rj c C sD t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< d S �Nr� r� r� �r| r9 r� rc r� r� r r r r9 q s z _dummyScrolledHList.__init__N)rj r� r r r r ra p s ra c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 x s z_dummyTList.__init__N)rj r� r r r r r� w s r� c @ s e Zd Zddd�ZdS )r� rj c C s� t �| ||d|g� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< z$t| d�| jd< t| d�| jd< W n tk
r� Y nX d S )Nr� r� r� r� r� r� r� )r| r9 r� rc r� r� r� r� r� r r r r9 | s �
z_dummyComboBox.__init__N)rj r� r r r r r� { s r� c @ s e Zd Zddd�ZdS )r� rj c C sD t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< d S r� r� r� r r r r9 � s z_dummyDirList.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C s4 t �| |||� t| d�| jd< t| d�| jd< d S )Nr� r� )r| r9 r� rc r� r� r r r r9 � s z_dummyDirSelectBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C s� t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S ) Nr� r� r� r� r� r� r� r� )r| r9 r� rc r� r� r� r� r r r r9 � s z _dummyExFileSelectBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C sT t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )Nr� r� r� r� )r| r9 r� rc r� r� r r r r9 � s
z _dummyFileSelectBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C s$ t �| |||� t| d�| jd< d S )Nr� )r| r9 r� rc r� r r r r9 � s z_dummyFileComboBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C sT t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )Nr� r� r� r� )r| r9 r� rc r� r r r r9 � s
z_dummyStdButtonBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )�_dummyNoteBookFramer c C s t �| |||� d S rF r� r� r r r r9 � s z _dummyNoteBookFrame.__init__N)r r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r` rj c C s t �| |||� d S rF r� r� r r r r9 � s z_dummyPanedWindow.__init__N)rj r� r r r r r` � s r` c C s | j �d| j�S )zzReturns the qualified path name for the widget. Normally used to set
default options for subwidgets. See tixwidgets.pyZ
tixOptionNamerM )r� r r r �
OptionName� s r� c C s: d}| � � D ](}|d | d | d | | d }q |S )Nr= z{{z} {z - z}} )�keys)�dict�s�typer r r � FileTypeList� s &r� c @ s e Zd ZdZdS )�CObjViewaB This file implements the Canvas Object View widget. This is a base
class of IconView. It implements automatic placement/adjustment of the
scrollbars according to the canvas objects inside the canvas subwidget.
The scrollbars are adjusted so that the canvas is just large enough
to see all the objects.
N)r2 r3 r4 r5 r r r r r� � s r� c @ s� e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd)d d �Zd*d
d�Z dd� Z
dd� Z dd� Z d+dd�Z
dd� Zdd� Zdd � Zd d � Zd d � Zd,d!d"�Zd#d$� Zd%d&� Zd'd(� ZdS )-�Grida} The Tix Grid command creates a new window and makes it into a
tixGrid widget. Additional options, may be specified on the command
line or in the option database to configure aspects such as its cursor
and relief.
A Grid widget displays its contents in a two dimensional grid of cells.
Each cell may contain one Tix display item, which may be in text,
graphics or other formats. See the DisplayStyle class for more information
about Tix display items. Individual cells, or groups of cells, can be
formatted with a wide range of attributes, such as its color, relief and
border.
Subwidgets - NoneNc K s" g }|| _ t�| |d|||� d S )NZtixGrid�r' r[ r9 r� r r r r9 � s z
Grid.__init__c C s | j �| dd� dS )z Removes the selection anchor.r� r Nr r? r r r r s zGrid.anchor_clearc C s | � | j�| dd��S )z3Get the (x,y) coordinate of the current anchor cellr� r/ �r/ r r r? r r r �
anchor_get s zGrid.anchor_getc C s | j �| dd||� dS )z/Set the selection anchor to the cell at (x, y).r� r� Nr r� r r r r� s zGrid.anchor_setc C s4 |dkr | j �| dd|� n| j �| dd||� dS )zdDelete rows between from_ and to inclusive.
If to is not provided, delete only row at from_Nrz r
r r� r r r �
delete_row s zGrid.delete_rowc C s4 |dkr | j �| dd|� n| j �| dd||� dS )zjDelete columns between from_ and to inclusive.
If to is not provided, delete only column at from_Nrz r r r� r r r �
delete_column s zGrid.delete_columnc C s | j �| dd� dS )zUIf any cell is being edited, de-highlight the cell and applies
the changes.�editr� Nr r? r r r �
edit_apply s zGrid.edit_applyc C s | j �| dd||� dS )zmHighlights the cell at (x, y) for editing, if the -editnotify
command returns True for this cell.r� r� Nr r� r r r �edit_set! s z
Grid.edit_setc C s, |r|d dkrd| }| j �| d|||�S )z&Get the option value for cell at (x,y)r r! rH r )r rQ rR r r r r rH & s zGrid.entrycgetc K s | � d||f||�S rI )Z
_configure)r rQ rR r' r( r r r rJ , s zGrid.entryconfigurec C s | � | j�| dd||��S )z+Return True if display item exists at (x,y)rT r( )Z _getbooleanr r r� r r r r7 2 s zGrid.info_existsc C s | j �| dd||�S r. r r� r r r r0 6 s zGrid.info_bboxc C s | j �| dd|||� dS )z�Moves the range of columns from position FROM through TO by
the distance indicated by OFFSET. For example, move_column(2, 4, 1)
moves the columns 2,3,4 to columns 3,4,5.�mover Nr �r r� r� �offsetr r r � move_column: s zGrid.move_columnc C s | j �| dd|||� dS )z�Moves the range of rows from position FROM through TO by
the distance indicated by OFFSET.
For example, move_row(2, 4, 1) moves the rows 2,3,4 to rows 3,4,5.r� r
Nr r� r r r �move_row@ s z
Grid.move_rowc C s | � | j�| d||��S )z8Return coordinate of cell nearest pixel coordinate (x,y)rL r� r� r r r rL F s z Grid.nearestc K s> | � | j|�}|d k r"d|f| }| jj| d||f|�� d S )Nz -itemtyper� )r% r' r r )r rQ rR r� r( �argsr r r r� P s zGrid.setc K s* | j �| j j| jdd|f| �i |��� �S )a� Queries or sets the size of the column given by
INDEX. INDEX may be any non-negative
integer that gives the position of a given column.
INDEX can also be the string "default"; in this case, this command
queries or sets the default size of all columns.
When no option-value pair is given, this command returns a tuple
containing the current size setting of the given column. When
option-value pairs are given, the corresponding options of the
size setting of the given column are changed. Options may be one
of the following:
pad0 pixels
Specifies the paddings to the left of a column.
pad1 pixels
Specifies the paddings to the right of a column.
size val
Specifies the width of a column. Val may be:
"auto" -- the width of the column is set to the
width of the widest cell in the column;
a valid Tk screen distance unit;
or a real number following by the word chars
(e.g. 3.4chars) that sets the width of the column to the
given number of characters.r r )r rP r rD r% �r r� r( r r r � size_columnV s
�zGrid.size_columnc K s( | j �| j j| dd|f| �i |��� �S )a� Queries or sets the size of the row given by
INDEX. INDEX may be any non-negative
integer that gives the position of a given row .
INDEX can also be the string "default"; in this case, this command
queries or sets the default size of all rows.
When no option-value pair is given, this command returns a list con-
taining the current size setting of the given row . When option-value
pairs are given, the corresponding options of the size setting of the
given row are changed. Options may be one of the following:
pad0 pixels
Specifies the paddings to the top of a row.
pad1 pixels
Specifies the paddings to the bottom of a row.
size val
Specifies the height of a row. Val may be:
"auto" -- the height of the row is set to the
height of the highest cell in the row;
a valid Tk screen distance unit;
or a real number following by the word chars
(e.g. 3.4chars) that sets the height of the row to the
given number of characters.r r
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e ej(�Z)e)Z(G dNd� de �Z*G dOd� de �Z+G dPd� de ej,�Z,G dQd� de ej-�Z-G dRd� de �Z.G dSd� de �Z/G dTd� de �Z0G dUd� de ej1ej2�Z3G dVd� de"�Z4G dWd� de&�Z5d S )^a� Ttk wrapper.
This module provides classes to allow using Tk themed widget set.
Ttk is based on a revised and enhanced version of
TIP #48 (http://tip.tcl.tk/48) specified style engine.
Its basic idea is to separate, to the extent possible, the code
implementing a widget's behavior from the code implementing its
appearance. Widget class bindings are primarily responsible for
maintaining the widget state and invoking callbacks, all aspects
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z0.3.1z!Guilherme Polo <ggpolo@gmail.com>�Button� Checkbutton�Combobox�Entry�Frame�Label�
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_load_tile" s �� r) c C s( |rt | �} nt| ttf�r$t| �} | S )zInternal function.)r �
isinstance�list�tupler )�value�scriptr' r' r( �_format_optvalue1 s
r/ c C sP g }| � � D ]:\}}|r ||kr |�d| � |dk r |�t||�� q t|�S )z�Formats optdict to a tuple to pass it to tk.call.
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r> c C s: g }| � � D ]$\}}|�d| tt|�|�f� q t|�S )z�Formats mapdict to pass it to tk.call.
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�r@ c O s� d}d}| dkr�| dkrB|d }t t|dd� ��}d||f }n2|dd� \}} t t|dd� ��}
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zAFormats args and kw according to the given element factory etype.Nr' )�imageZvsapirA r r7 z%s %s� z%s %s %s�fromz{%s}r9 )r r> r6 r: r/ r; ) �etyper. �args�kw�specr4 ZinameZ imagespec�
class_nameZpart_idZstatemapr' r' r( �_format_elemcreateq s&
rI rB c
C s� g }| D ]�}|\}}|pi }d� t|dd��}dd| ||rDd| ndf }d|kr�|�|d � ||7 }t|d ||�\} }|�| � ||8 }|�d d| � q|�|� qd
� |�|fS ) a$ Formats a layout list so we can pass the result to ttk::style
layout and ttk::style settings. Note that the layout doesn't have to
be a list necessarily.
E.g.:
[("Menubutton.background", None),
("Menubutton.button", {"children":
[("Menubutton.focus", {"children":
[("Menubutton.padding", {"children":
[("Menubutton.label", {"side": "left", "expand": 1})]
})]
})]
}),
("Menubutton.indicator", {"side": "right"})
]
returns:
Menubutton.background
Menubutton.button -children {
Menubutton.focus -children {
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}
}
}
Menubutton.indicator -side rightr9 T)�childrenz%s%s%sz %sr8 rJ z -children {z%s}�
)r; r6 r2 �_format_layoutlist)
�layout�indentZ indent_sizer. Z layout_elem�elemr4 Zfopts�headZ newscriptr' r' r( rL � s"
�
rL c C sX g }| � � D �]>\}}|�d�rFd�t|d d��}|�d||f � |�d�rvd�t|d d��}|�d||f � d|kr�|d s�d}nt|d �\}}|�d ||f � |�d
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}|d }d }|t|�k r�t|| d
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t |df| �|
�\} }|�d||| |f � q d�|�S )z�Returns an appropriate script, based on settings, according to
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theme_create.� configurer9 Tzttk::style configure %s %s;�mapzttk::style map %s %s;rM �nullzttk::style layout %s {
%s
}zelement creater r7 r1 z%ttk::style element create %s %s %s %srK )
r1 r" r; r6 r2 r@ rL r: �hasattrrI ) �settingsr. �namer4 �s�_ZeoptsrD ZargcZelemargsZelemkwrG r' r' r( �_script_from_settings� s:
$ �
rY c C s� t | t�r| S g }t| �}t||�D ]j\}}t|d�rDt|��� }n(t |t�rX|�� }nt |ttf�sl|f}t|d�r~t|�}|�||f�� q$|S )ztConstruct a list from the given statespec tuple according to the
accepted statespec accepted by _format_mapdict.�typename) r* �str�iter�ziprT �splitr, r+ r2 )Zstuple�result�itr< r= r' r' r( �_list_from_statespec� s
ra c C s� | � |�}g }d}|t|�k r�|| }i }|�||f� |d7 }|t|�k r|||d � \}}|�d�slq|dd� }|d7 }|dkr�t| |�}|||< q@q|S )zpConstruct a list from the tuple returned by ttk::layout, this is
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startswith�_list_from_layouttuple)r# Zltuple�resZindxrV r4 r5 r= r' r' r( re s$
re c G s4 t |�}| j|| � }t|�d r&|S t| |td�S )ah Format options then call Tk command with args and options and return
the appropriate result.
If no option is specified, a dict is returned. If an option is
specified with the None value, the value for that option is returned.
Otherwise, the function just sets the passed options and the caller
shouldn't be expecting a return value anyway.rB )�conv)r6 �callr: r �
_tclobj_to_py)r# �optionsrE rf r' r' r( � _val_or_dict! s
rk c C s2 t | �} z t| �} W n ttfk
r, Y nX | S )zAConverts a value to, hopefully, a more appropriate Python object.)r[ �int�
ValueError� TypeError)r- r' r' r( �_convert_stringval1 s ro c C s( t | t�r$d| kr t| �} nt| �} | S )N�.)r* r[ �floatrl )�xr' r' r( �
_to_number; s
rs c C s\ | rFt | d�rFt| t�sFt| d dd�dkr6t| �} qXttt| ��} nt | d�rXt| �} | S )z8Return value converted from Tcl object to Python object.�__len__r rZ NZ StateSpec)rT r* r[ �getattrra r+ rR ro )r= r' r' r( ri C s
ri c C s" | � � D ]\}}t|�| |< q| S )zOReturns adict with its values converted from Tcl objects to Python
objects.)r1 ri )Zadictr5 r= r' r' r( r P s c C s | dkrt �� } | S )a If master is not None, itself is returned. If master is None,
the default master is returned if there is one, otherwise a new
master is created and returned.
If it is not allowed to use the default root and master is None,
RuntimeError is raised.N)�tkinterZ_get_default_root)r& r' r' r( r X s c @ s� e Zd ZdZdZd dd�Zd dd�Zd dd �Zd d
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dd� Z dd� Z d!dd�Z
dd� Zdd� Zd"dd�ZdS )#r zManipulate style database.z
ttk::styleNc C s0 t |�}t|dd�s t|� || _| jj| _d S )Nr% F)r ru r) r& r# )�selfr& r' r' r( �__init__i s
zStyle.__init__c K s4 |dk rd||< t | j|| jd|�}|s,|r0|S dS )z�Query or sets the default value of the specified option(s) in
style.
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a sequence identifying the value for that option.NrQ )rk r# �_name�rw �styleZ query_optrF r_ r' r' r( rQ t s
zStyle.configurec sj |dk r0� j �� jd|d| �}t� j �|��S � j j� jd|ft|��� }� fdd�t� j |��� D �S )aS Query or sets dynamic values of the specified option(s) in
style.
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tuple (usually) containing statespecs grouped in tuples, or list,
or something else of your preference. A statespec is compound of
one or more states and then a value.NrR r0 c s" i | ]\}}|t � j�|���qS r' )ra r# rc )�.0�k�v�rw r' r( �
<dictcomp>� s � z Style.map.<locals>.<dictcomp>)r# rh ry ra rc r@ r r1 rz r' r r( rR � s
�z Style.mapc C s. |rd� |�nd}| j�| jd|d| ||�S )a Returns the value specified for option in style.
If state is specified it is expected to be a sequence of one
or more states. If the default argument is set, it is used as
a fallback value in case no specification for option is found.r9 r8 �lookupr0 )r; r# rh ry )rw r{ �optionr< �defaultr' r' r( r� � s
�z Style.lookupc C s> d}|rt |�d }n |dk r"d}t| j| j�| jd||��S )a� Define the widget layout for given style. If layoutspec is
omitted, return the layout specification for given style.
layoutspec is expected to be a list or an object different than
None that evaluates to False if you want to "turn off" that style.
If it is a list (or tuple, or something else), each item should be
a tuple where the first item is the layout name and the second item
should have the format described below:
LAYOUTS
A layout can contain the value None, if takes no options, or
a dict of options specifying how to arrange the element.
The layout mechanism uses a simplified version of the pack
geometry manager: given an initial cavity, each element is
allocated a parcel. Valid options/values are:
side: whichside
Specifies which side of the cavity to place the
element; one of top, right, bottom or left. If
omitted, the element occupies the entire cavity.
sticky: nswe
Specifies where the element is placed inside its
allocated parcel.
children: [sublayout... ]
Specifies a list of elements to place inside the
element. Each element is a tuple (or other sequence)
where the first item is the layout name, and the other
is a LAYOUT.Nr rS rM )rL re r# rh ry )rw r{ Z
layoutspecZlspecr' r' r( rM � s �z Style.layoutc O s8 t |df|�|�\}}| jj| jdd|||f|�� dS )z9Create a new element in the current theme of given etype.F�element�createN)rI r# rh ry )rw � elementnamerD rE rF rG r4 r' r' r( �element_create� s ��zStyle.element_createc C s( t dd� | j�| j�| jdd��D ��S )z:Returns the list of elements defined in the current theme.c s s | ]}|� d �V qdS �rb N��lstrip)r| �nr' r' r( � <genexpr>� s z&Style.element_names.<locals>.<genexpr>r� �names�r, r# rc rh ry r r' r' r( �
element_names� s �zStyle.element_namesc
C s* t dd� | j�| j�| jdd|��D ��S )z)Return the list of elementname's options.c s s | ]}|� d �V qdS r� r� )r| �or' r' r( r� � s z(Style.element_options.<locals>.<genexpr>r� rj r� )rw r� r' r' r( �element_options� s �zStyle.element_optionsc
C sN |r t |�nd}|r2| j�| jdd|d|d|� n| j�| jdd|d|� dS )a. Creates a new theme.
It is an error if themename already exists. If parent is
specified, the new theme will inherit styles, elements and
layouts from the specified parent theme. If settings are present,
they are expected to have the same syntax used for theme_settings.r8 �themer� z-parentz -settingsN�rY r# rh ry )rw � themename�parentrU r. r' r' r( � theme_create� s � �zStyle.theme_createc C s" t |�}| j�| jdd||� dS )a� Temporarily sets the current theme to themename, apply specified
settings and then restore the previous theme.
Each key in settings is a style and each value may contain the
keys 'configure', 'map', 'layout' and 'element create' and they
are expected to have the same format as specified by the methods
configure, map, layout and element_create respectively.r� rU Nr� )rw r� rU r. r' r' r( �theme_settings� s zStyle.theme_settingsc C s | j �| j �| jdd��S )z#Returns a list of all known themes.r� r� )r# rc rh ry r r' r' r( � theme_names� s zStyle.theme_namesc C s& |dkr| j �d�S | j �d|� dS )z�If themename is None, returns the theme in use, otherwise, set
the current theme to themename, refreshes all widgets and emits
a <<ThemeChanged>> event.Nzreturn $ttk::currentThemez
ttk::setTheme)r# r$ rh )rw r� r' r' r( � theme_use� s zStyle.theme_use)N)N)N)NN)N)NN)N)�__name__�
__module__� __qualname__�__doc__ry rx rQ rR r� rM r� r� r� r� r� r� r� r' r' r' r( r d s
+
c @ s6 e Zd ZdZd dd�Zdd� Zd dd�Zd
d d
�ZdS )�Widgetz!Base class for Tk themed widgets.Nc C s4 t |�}t|dd�s t|� tjj| |||d� dS )a� Constructs a Ttk Widget with the parent master.
STANDARD OPTIONS
class, cursor, takefocus, style
SCROLLABLE WIDGET OPTIONS
xscrollcommand, yscrollcommand
LABEL WIDGET OPTIONS
text, textvariable, underline, image, compound, width
WIDGET STATES
active, disabled, focus, pressed, selected, background,
readonly, alternate, invalid
r% F)rF N)r ru r) rv r� rx )rw r& Z
widgetnamerF r' r' r( rx s zWidget.__init__c C s | j �| jd||�S )z�Returns the name of the element at position x, y, or the empty
string if the point does not lie within any element.
x and y are pixel coordinates relative to the widget.�identify�r# rh �_w�rw rr �yr' r' r( r� + s zWidget.identifyc O s6 | j �| j �| jdd�|���}|r2|r2|||�S |S )a1 Test the widget's state.
If callback is not specified, returns True if the widget state
matches statespec and False otherwise. If callback is specified,
then it will be invoked with *args, **kw if the widget state
matches statespec. statespec is expected to be a sequence.�instater9 )r# �
getbooleanrh r� r; )rw � statespec�callbackrE rF Zretr' r' r( r� 3 s �
zWidget.instatec C s0 |dk rd� |�}| j�t| j�| jd|���S )a Modify or inquire widget state.
Widget state is returned if statespec is None, otherwise it is
set according to the statespec flags and then a new state spec
is returned indicating which flags were changed. statespec is
expected to be a sequence.Nr9 r< )r; r# rc r[ rh r� )rw r� r' r' r( r< B s
z Widget.state)N)N)N)r� r� r� r� rx r� r� r< r' r' r' r( r�
s
r� c @ s" e Zd ZdZddd�Zdd� ZdS )r zcTtk Button widget, displays a textual label and/or image, and
evaluates a command when pressed.Nc K s t �| |d|� dS )a Construct a Ttk Button widget with the parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, default, width
z ttk::buttonN�r� rx �rw r& rF r' r' r( rx S s zButton.__init__c C s | j �| jd�S )z/Invokes the command associated with the button.�invoker� r r' r' r( r� b s z
Button.invoke)N�r� r� r� r� rx r� r' r' r' r( r O s
c @ s" e Zd ZdZddd�Zdd� ZdS )r z;Ttk Checkbutton widget which is either in on- or off-state.Nc K s t �| |d|� dS )a' Construct a Ttk Checkbutton widget with the parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, offvalue, onvalue, variable
zttk::checkbuttonNr� r� r' r' r( rx j s zCheckbutton.__init__c C s | j �| jd�S )aW Toggles between the selected and deselected states and
invokes the associated command. If the widget is currently
selected, sets the option variable to the offvalue option
and deselects the widget; otherwise, sets the option variable
to the option onvalue.
Returns the result of the associated command.r� r� r r' r' r( r� y s zCheckbutton.invoke)Nr� r' r' r' r( r g s
c @ s2 e Zd ZdZd dd�Zdd� Zdd� Zd d
� ZdS ) r zeTtk Entry widget displays a one-line text string and allows that
string to be edited by the user.Nc K s t �| ||pd|� dS )a� Constructs a Ttk Entry widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus, xscrollcommand
WIDGET-SPECIFIC OPTIONS
exportselection, invalidcommand, justify, show, state,
textvariable, validate, validatecommand, width
VALIDATION MODES
none, key, focus, focusin, focusout, all
z
ttk::entryNr� )rw r& ZwidgetrF r' r' r( rx � s zEntry.__init__c C s | � | j�| jd|��S )zqReturn a tuple of (x, y, width, height) which describes the
bounding box of the character given by index.�bbox�Z_getintsr# rh r� )rw �indexr' r' r( r� � s z
Entry.bboxc C s | j �| jd||�S )zxReturns the name of the element at position x, y, or the
empty string if the coordinates are outside the window.r� r� r� r' r' r( r� � s zEntry.identifyc C s | j �| j �| jd��S )z�Force revalidation, independent of the conditions specified
by the validate option. Returns False if validation fails, True
if it succeeds. Sets or clears the invalid state accordingly.�validate�r# r� rh r� r r' r' r( r� � s zEntry.validate)NN)r� r� r� r� rx r� r� r� r' r' r' r( r � s
c @ s, e Zd ZdZd dd�Zd
dd�Zdd� ZdS ) r zMTtk Combobox widget combines a text field with a pop-down list of
values.Nc K s t j| |df|� dS )a Construct a Ttk Combobox widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
exportselection, justify, height, postcommand, state,
textvariable, values, width
z
ttk::comboboxN�r rx r� r' r' r( rx � s zCombobox.__init__c C s2 |dkr | j �| j �| jd��S | j �| jd|�S )a If newindex is supplied, sets the combobox value to the
element at position newindex in the list of values. Otherwise,
returns the index of the current value in the list of values
or -1 if the current value does not appear in the list.N�current�r# Zgetintrh r� )rw Znewindexr' r' r( r� � s zCombobox.currentc C s | j �| jd|� dS )z(Sets the value of the combobox to value.�setNr� �rw r- r' r' r( r� � s z Combobox.set)N)N)r� r� r� r� rx r� r� r' r' r' r( r � s
c @ s e Zd ZdZddd�ZdS )r zJTtk Frame widget is a container, used to group other widgets
together.Nc K s t �| |d|� dS )z�Construct a Ttk Frame with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
borderwidth, relief, padding, width, height
z
ttk::frameNr� r� r' r' r( rx � s zFrame.__init__)N�r� r� r� r� rx r' r' r' r( r � s c @ s e Zd ZdZddd�ZdS )r z7Ttk Label widget displays a textual label and/or image.Nc K s t �| |d|� dS )aG Construct a Ttk Label with parent master.
STANDARD OPTIONS
class, compound, cursor, image, style, takefocus, text,
textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
anchor, background, font, foreground, justify, padding,
relief, text, wraplength
z
ttk::labelNr� r� r' r' r( rx � s
zLabel.__init__)Nr� r' r' r' r( r � s c @ s e Zd ZdZddd�ZdS )r z�Ttk Labelframe widget is a container used to group other widgets
together. It has an optional label, which may be a plain text string
or another widget.Nc K s t �| |d|� dS )z�Construct a Ttk Labelframe with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
labelanchor, text, underline, padding, labelwidget, width,
height
zttk::labelframeNr� r� r' r' r( rx � s zLabelframe.__init__)Nr� r' r' r' r( r � s c @ s e Zd ZdZddd�ZdS )r zbTtk Menubutton widget displays a textual label and/or image, and
displays a menu when pressed.Nc K s t �| |d|� dS )a Construct a Ttk Menubutton with parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
direction, menu
zttk::menubuttonNr� r� r' r' r( rx s zMenubutton.__init__)Nr� r' r' r' r( r
s c @ sn e Zd ZdZddd�Zdd� Zdd� Zd d
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z�Ttk Notebook widget manages a collection of windows and displays
a single one at a time. Each child window is associated with a tab,
which the user may select to change the currently-displayed window.Nc K s t �| |d|� dS )a\ Construct a Ttk Notebook with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
height, padding, width
TAB OPTIONS
state, sticky, padding, text, image, compound, underline
TAB IDENTIFIERS (tab_id)
The tab_id argument found in several methods may take any of
the following forms:
* An integer between zero and the number of tabs
* The name of a child window
* A positional specification of the form "@x,y", which
defines the tab
* The string "current", which identifies the
currently-selected tab
* The string "end", which returns the number of tabs (only
valid for method index)
z
ttk::notebookNr� r� r' r' r( rx " s zNotebook.__init__c K s | j j| jd|ft|��� dS )z�Adds a new tab to the notebook.
If window is currently managed by the notebook but hidden, it is
restored to its previous position.�addN�r# rh r� r6 )rw �childrF r' r' r( r� B s z Notebook.addc C s | j �| jd|� dS )zXRemoves the tab specified by tab_id, unmaps and unmanages the
associated window.�forgetNr� �rw �tab_idr' r' r( r� J s zNotebook.forgetc C s | j �| jd|� dS )z�Hides the tab specified by tab_id.
The tab will not be displayed, but the associated window remains
managed by the notebook and its configuration remembered. Hidden
tabs may be restored with the add command.�hideNr� r� r' r' r( r� P s z
Notebook.hidec C s | j �| jd||�S )zZReturns the name of the tab element at position x, y, or the
empty string if none.r� r� r� r' r' r( r� Y s zNotebook.identifyc C s | j �| j �| jd|��S )z|Returns the numeric index of the tab specified by tab_id, or
the total number of tabs if tab_id is the string "end".r� r� r� r' r' r( r� _ s zNotebook.indexc K s" | j j| jd||ft|��� dS )z�Inserts a pane at the specified position.
pos is either the string end, an integer index, or the name of
a managed child. If child is already managed by the notebook,
moves it to the specified position.�insertNr� �rw �posr� rF r' r' r( r� e s zNotebook.insertc C s | j �| jd|�S )z�Selects the specified tab.
The associated child window will be displayed, and the
previously-selected window (if different) is unmapped. If tab_id
is omitted, returns the widget name of the currently selected
pane.�selectr� r� r' r' r( r� n s zNotebook.selectc K s$ |dk rd||< t | j|| jd|�S )z�Query or modify the options of the specific tab_id.
If kw is not given, returns a dict of the tab option values. If option
is specified, returns the value of that option. Otherwise, sets the
options to the corresponding values.N�tab�rk r# r� )rw r� r� rF r' r' r( r� x s z Notebook.tabc C s | j �| j �| jd�pd�S )z2Returns a list of windows managed by the notebook.�tabsr' �r# rc rh r� r r' r' r( r� � s z
Notebook.tabsc C s | j �d| j� dS )a� Enable keyboard traversal for a toplevel window containing
this notebook.
This will extend the bindings for the toplevel window containing
this notebook as follows:
Control-Tab: selects the tab following the currently selected
one
Shift-Control-Tab: selects the tab preceding the currently
selected one
Alt-K: where K is the mnemonic (underlined) character of any
tab, will select that tab.
Multiple notebooks in a single toplevel may be enabled for
traversal, including nested notebooks. However, notebook traversal
only works properly if all panes are direct children of the
notebook.z ttk::notebook::enableTraversalNr� r r' r' r( �enable_traversal� s zNotebook.enable_traversal)N)N)N)r� r� r� r� rx r� r� r� r� r� r� r� r� r� r� r' r' r' r( r
s
c @ s> e Zd ZdZd dd�ZejjZdd� Zd dd�Z d
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dS )r zfTtk Panedwindow widget displays a number of subwindows, stacked
either vertically or horizontally.Nc K s t �| |d|� dS )z�Construct a Ttk Panedwindow with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
orient, width, height
PANE OPTIONS
weight
zttk::panedwindowNr� r� r' r' r( rx � s zPanedwindow.__init__c K s" | j j| jd||ft|��� dS )z�Inserts a pane at the specified positions.
pos is either the string end, and integer index, or the name
of a child. If child is already managed by the paned window,
moves it to the specified position.r� Nr� r� r' r' r( r� � s zPanedwindow.insertc K s$ |dk rd||< t | j|| jd|�S )aQ Query or modify the options of the specified pane.
pane is either an integer index or the name of a managed subwindow.
If kw is not given, returns a dict of the pane option values. If
option is specified then the value for that option is returned.
Otherwise, sets the options to the corresponding values.N�paner� )rw r� r� rF r' r' r( r� � s zPanedwindow.panec C s | j �| j �| jd||��S )aL If newpos is specified, sets the position of sash number index.
May adjust the positions of adjacent sashes to ensure that
positions are monotonically increasing. Sash positions are further
constrained to be between 0 and the total size of the widget.
Returns the new position of sash number index.�sashposr� )rw r� Znewposr' r' r( r� � s zPanedwindow.sashpos)N)N)N) r� r� r� r� rx rv r r� r� r� r� r' r' r' r( r � s
c @ s6 e Zd ZdZd dd�Zd dd�Zd
dd�Zd d
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a6 Ttk Progressbar widget shows the status of a long-running
operation. They can operate in two modes: determinate mode shows the
amount completed relative to the total amount of work to be done, and
indeterminate mode provides an animated display to let the user know
that something is happening.Nc K s t �| |d|� dS )z�Construct a Ttk Progressbar with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
orient, length, mode, maximum, value, variable, phase
zttk::progressbarNr� r� r' r' r( rx � s zProgressbar.__init__c C s | j �| jd|� dS )z�Begin autoincrement mode: schedules a recurring timer event
that calls method step every interval milliseconds.
interval defaults to 50 milliseconds (20 steps/second) if omitted.�startNr� )rw Zintervalr' r' r( r� � s zProgressbar.startc C s | j �| jd|� dS )zRIncrements the value option by amount.
amount defaults to 1.0 if omitted.�stepNr� )rw Zamountr' r' r( r� � s zProgressbar.stepc C s | j �| jd� dS )zVStop autoincrement mode: cancels any recurring timer event
initiated by start.�stopNr� r r' r' r( r� s zProgressbar.stop)N)N)N)r� r� r� r� rx r� r� r� r' r' r' r( r
� s
c @ s" e Zd ZdZddd�Zdd� ZdS )r zeTtk Radiobutton widgets are used in groups to show or change a
set of mutually-exclusive options.Nc K s t �| |d|� dS )a Construct a Ttk Radiobutton with parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, value, variable
zttk::radiobuttonNr� r� r' r' r( rx s zRadiobutton.__init__c C s | j �| jd�S )z�Sets the option variable to the option value, selects the
widget, and invokes the associated command.
Returns the result of the command, or an empty string if
no command is specified.r� r� r r' r' r( r� s zRadiobutton.invoke)Nr� r' r' r' r( r s
c @ s. e Zd ZdZd dd�Zd
dd�Zd dd�ZdS ) r zTtk Scale widget is typically used to control the numeric value of
a linked variable that varies uniformly over some range.Nc K s t �| |d|� dS )z�Construct a Ttk Scale with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
command, from, length, orient, to, value, variable
z
ttk::scaleNr� r� r' r' r( rx ' s zScale.__init__c K sT t j| |f|�}t|td�tf�s,|�|� td|kd|kd|kg�rP| �d� |S )z�Modify or query scale options.
Setting a value for any of the "from", "from_" or "to" options
generates a <<RangeChanged>> event.NrC �from_�to�<<RangeChanged>>)r� rQ r* �typer[ �update�anyZevent_generate)rw ZcnfrF Zretvalr' r' r( rQ 5 s
zScale.configurec C s | j �| jd||�S )z�Get the current value of the value option, or the value
corresponding to the coordinates x, y if they are specified.
x and y are pixel coordinates relative to the scale widget
origin.r" r� r� r' r' r( r" B s z Scale.get)N)N)NN)r� r� r� r� rx rQ r" r' r' r' r( r # s
c @ s e Zd ZdZddd�ZdS )r z;Ttk Scrollbar controls the viewport of a scrollable widget.Nc K s t �| |d|� dS )z�Construct a Ttk Scrollbar with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
command, orient
zttk::scrollbarNr� r� r' r' r( rx N s zScrollbar.__init__)Nr� r' r' r' r( r K s c @ s e Zd ZdZddd�ZdS )r zITtk Separator widget displays a horizontal or vertical separator
bar.Nc K s t �| |d|� dS )z�Construct a Ttk Separator with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
orient
zttk::separatorNr� r� r' r' r( rx ` s zSeparator.__init__)Nr� r' r' r' r( r \ s c @ s e Zd ZdZddd�ZdS )r zlTtk Sizegrip allows the user to resize the containing toplevel
window by pressing and dragging the grip.Nc K s t �| |d|� dS )z�Construct a Ttk Sizegrip with parent master.
STANDARD OPTIONS
class, cursor, state, style, takefocus
z
ttk::sizegripNr� r� r' r' r( rx r s zSizegrip.__init__)Nr� r' r' r' r( r n s c @ s" e Zd ZdZddd�Zdd� ZdS )r z�Ttk Spinbox is an Entry with increment and decrement arrows
It is commonly used for number entry or to select from a list of
string values.
Nc K s t j| |df|� dS )a/ Construct a Ttk Spinbox widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus, validate,
validatecommand, xscrollcommand, invalidcommand
WIDGET-SPECIFIC OPTIONS
to, from_, increment, values, wrap, format, command
z ttk::spinboxNr� r� r' r' r( rx � s zSpinbox.__init__c C s | j �| jd|� dS )z'Sets the value of the Spinbox to value.r� Nr� r� r' r' r( r� � s z Spinbox.set)N)r� r� r� r� rx r� r' r' r' r( r | s
c @ s4 e Zd ZdZdEdd�ZdFdd�ZdGdd�Zd d
� ZdHd d �Zd
d� Z dd� Z
dd� Z dIdd�Z dJdd�Z
dd� Zdd� Zdd � Zd d � Zd d � Zd!d"� ZdKd#d$�ZdLd%d&�Zd'd(� ZeZd)d*� Zd+d,� Zd-d.� Zd/d0� Zd1d2� Z d3d4� Z d5d6� Z d7d8� Z d9d:� Z d;d<� Z!dMd=d>�Z"dNd?d@�Z#dOdAdB�Z$dPdCdD�Z%dS )Qr z�Ttk Treeview widget displays a hierarchical collection of items.
Each item has a textual label, an optional image, and an optional list
of data values. The data values are displayed in successive columns
after the tree label.Nc K s t �| |d|� dS )a� Construct a Ttk Treeview with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus, xscrollcommand,
yscrollcommand
WIDGET-SPECIFIC OPTIONS
columns, displaycolumns, height, padding, selectmode, show
ITEM OPTIONS
text, image, values, open, tags
TAG OPTIONS
foreground, background, font, image
z
ttk::treeviewNr� r� r' r' r( rx � s zTreeview.__init__c C s | � | j�| jd||��p dS )aT Returns the bounding box (relative to the treeview widget's
window) of the specified item in the form x y width height.
If column is specified, returns the bounding box of that cell.
If the item is not visible (i.e., if it is a descendant of a
closed item or is scrolled offscreen), returns an empty string.r� r8 r� )rw �item�columnr' r' r( r� � s z
Treeview.bboxc C s" | j �| j �| jd|pd�p d�S )zhReturns a tuple of children belonging to item.
If item is not specified, returns root children.rJ r8 r' r� �rw r� r' r' r( � get_children� s �zTreeview.get_childrenc G s | j �| jd||� dS )z�Replaces item's child with newchildren.
Children present in item that are not present in newchildren
are detached from tree. No items in newchildren may be an
ancestor of item.rJ Nr� )rw r� Z newchildrenr' r' r( � set_children� s zTreeview.set_childrenc K s$ |dk rd||< t | j|| jd|�S )a
Query or modify the options for the specified column.
If kw is not given, returns a dict of the column option values. If
option is specified then the value for that option is returned.
Otherwise, sets the options to the corresponding values.Nr� r� )rw r� r� rF r' r' r( r� � s zTreeview.columnc G s | j �| jd|� dS )z_Delete all specified items and all their descendants. The root
item may not be deleted.�deleteNr� �rw r1 r' r' r( r� � s zTreeview.deletec G s | j �| jd|� dS )z�Unlinks all of the specified items from the tree.
The items and all of their descendants are still present, and may
be reinserted at another point in the tree, but will not be
displayed. The root item may not be detached.�detachNr� r� r' r' r( r� � s zTreeview.detachc C s | j �| j �| jd|��S )zSReturns True if the specified item is present in the tree,
False otherwise.�existsr� r� r' r' r( r� � s zTreeview.existsc C s | j �| jd|�S )z}If item is specified, sets the focus item to item. Otherwise,
returns the current focus item, or '' if there is none.�focusr� r� r' r' r( r� � s zTreeview.focusc K sP |� d�}|r,t|t�s,| j�|| j�|d< |dk r<d||< t| j|| jd|�S )a_ Query or modify the heading options for the specified column.
If kw is not given, returns a dict of the heading option values. If
option is specified then the value for that option is returned.
Otherwise, sets the options to the corresponding values.
Valid options/values are:
text: text
The text to display in the column heading
image: image_name
Specifies an image to display to the right of the column
heading
anchor: anchor
Specifies how the heading text should be aligned. One of
the standard Tk anchor values
command: callback
A callback to be invoked when the heading label is
pressed.
To configure the tree column heading, call this with column = "#0" �commandN�heading) r" r* r[ r& �registerZ _substituterk r# r� )rw r� r� rF �cmdr' r' r( r� � s
zTreeview.headingc C s | j �| jd|||�S )z�Returns a description of the specified component under the
point given by x and y, or the empty string if no such component
is present at that position.r� r� )rw Z componentrr r� r' r' r( r� s zTreeview.identifyc C s | � dd|�S )z.Returns the item ID of the item at position y.�rowr �r� )rw r� r' r' r( � identify_row s zTreeview.identify_rowc C s | � d|d�S )zaReturns the data column identifier of the cell at position x.
The tree column has ID #0.r� r r� )rw rr r' r' r( �identify_column" s zTreeview.identify_columnc C s | � d||�S )z�Returns one of:
heading: Tree heading area.
separator: Space between two columns headings;
tree: The tree area.
cell: A data cell.
* Availability: Tk 8.6Zregionr� r� r' r' r( �identify_region) s zTreeview.identify_regionc C s | � d||�S )zEReturns the element at position x, y.
* Availability: Tk 8.6r� r� r� r' r' r( �identify_element5 s zTreeview.identify_elementc C s | j �| j �| jd|��S )zOReturns the integer index of item within its parent's list
of children.r� r� r� r' r' r( r� < s zTreeview.indexc K sN t |�}|dk r0| jj| jd||d|f|�� }n| jj| jd||f|�� }|S )a� Creates a new item and return the item identifier of the newly
created item.
parent is the item ID of the parent item, or the empty string
to create a new top-level item. index is an integer, or the value
end, specifying where in the list of parent's children to insert
the new item. If index is less than or equal to zero, the new node
is inserted at the beginning, if index is greater than or equal to
the current number of children, it is inserted at the end. If iid
is specified, it is used as the item identifier, iid must not
already exist in the tree. Otherwise, a new unique identifier
is generated.Nr� z-id)r6 r# rh r� )rw r� r� ZiidrF r4 rf r' r' r( r� B s
��zTreeview.insertc K s$ |dk rd||< t | j|| jd|�S )a- Query or modify the options for the specified item.
If no options are given, a dict with options/values for the item
is returned. If option is specified then the value for that option
is returned. Otherwise, sets the options to the corresponding
values as given by kw.Nr� r� )rw r� r� rF r' r' r( r� Y s z
Treeview.itemc C s | j �| jd|||� dS )aR Moves item to position index in parent's list of children.
It is illegal to move an item under one of its descendants. If
index is less than or equal to zero, item is moved to the
beginning, if greater than or equal to the number of children,
it is moved to the end. If item was detached it is reattached.�moveNr� )rw r� r� r� r' r' r( r� e s z
Treeview.movec C s | j �| jd|�S )zeReturns the identifier of item's next sibling, or '' if item
is the last child of its parent.�nextr� r� r' r' r( r� q s z
Treeview.nextc C s | j �| jd|�S )zaReturns the ID of the parent of item, or '' if item is at the
top level of the hierarchy.r� r� r� r' r' r( r� w s zTreeview.parentc C s | j �| jd|�S )zjReturns the identifier of item's previous sibling, or '' if
item is the first child of its parent.�prevr� r� r' r' r( r� } s z
Treeview.prevc C s | j �| jd|� dS )z�Ensure that item is visible.
Sets all of item's ancestors open option to True, and scrolls
the widget if necessary so that item is within the visible
portion of the tree.�seeNr� r� r' r' r( r� � s z Treeview.seec C s | j �| j �| jd��S )z$Returns the tuple of selected items.� selectionr� r r' r' r( r� � s zTreeview.selectionc C s> t |�dkr&t|d ttf�r&|d }| j�| jd||� d S )Nr7 r r� )r: r* r, r+ r# rh r� )rw Zselopr1 r' r' r( �
_selection� s zTreeview._selectionc G s | � d|� dS )z.The specified items becomes the new selection.r� N�r� r� r' r' r( �
selection_set� s zTreeview.selection_setc G s | � d|� dS )z0Add all of the specified items to the selection.r� Nr� r� r' r' r( �
selection_add� s zTreeview.selection_addc G s | � d|� dS )z5Remove all of the specified items from the selection.�removeNr� r� r' r' r( �selection_remove� s zTreeview.selection_removec G s | � d|� dS )z2Toggle the selection state of each specified item.ZtoggleNr� r� r' r' r( �selection_toggle� s zTreeview.selection_togglec C s@ | j �| jd|||�}|dkr8|dkr8t| j |dtd�S |S dS )a; Query or set the value of given item.
With one argument, return a dictionary of column/value pairs
for the specified item. With two arguments, return the current
value of the specified column. With three arguments, set the
value of given column in given item to the specified value.r� NF)Z cut_minusrg )r# rh r� r ri )rw r� r� r- rf r' r' r( r� � s �z Treeview.setc C s | j | jdd|f||dd� dS )z�Bind a callback for the given event sequence to the tag tagname.
When an event is delivered to an item, the callbacks for each
of the item's tags option are called.�tag�bindr )r� N)Z_bindr� )rw �tagnameZsequencer� r' r' r( �tag_bind� s zTreeview.tag_bindc K s& |dk rd||< t | j|| jdd|�S )aB Query or modify the options for the specified tagname.
If kw is not given, returns a dict of the option settings for tagname.
If option is specified, returns the value for that option for the
specified tagname. Otherwise, sets the options to the corresponding
values for the given tagname.Nr� rQ r� )rw r� r� rF r' r' r( �
tag_configure� s
�zTreeview.tag_configurec C sF |dkr$| j �| j �| jdd|��S | j �| j �| jdd||��S dS )z�If item is specified, returns 1 or 0 depending on whether the
specified item has the given tagname. Otherwise, returns a list of
all items which have the specified tag.
* Availability: Tk 8.6Nr� Zhas)r# rc rh r� r� )rw r� r� r' r' r( �tag_has� s ��zTreeview.tag_has)N)N)N)N)N)N)N)N)NN)NN)N)N)&r� r� r� r� rx r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� Zreattachr� r� r� r� r� r� r� r� r� r� r� r� r� r� r' r' r' r( r � sF
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S )r z�A Ttk Scale widget with a Ttk Label widget indicating its
current value.
The Ttk Scale can be accessed through instance.scale, and Ttk Label
can be accessed through instance.labelNr �
c K s |� dd�dk| _tj| |f|� |p.t�|�| _| j�|� || _t | �| _
t | | j||d�| _ | j �
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d| j� dS )a� Construct a horizontal LabeledScale with parent master, a
variable to be associated with the Ttk Scale widget and its range.
If variable is not specified, a tkinter.IntVar is created.
WIDGET-SPECIFIC OPTIONS
compound: 'top' or 'bottom'
Specifies how to display the label relative to the scale.
Defaults to 'top'.
Zcompound�top)�variabler� r� r� Zbottomrr )�sideZfill)r� r� rW )Zanchor�wz <Configure>z<Map>N)�pop�
_label_topr rx rv ZIntVar� _variabler� � _last_validr �labelr �scaler� �_adjustZpack�lowerZplaceZtrace_variable�_LabeledScale__tracecb) rw r& r� r� r� rF Z
scale_sideZ
label_sideZdummyr' r' r( rx � s$
zLabeledScale.__init__c sH z| j �d| j� W n tk
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WIDGET-SPECIFIC OPTIONS
style: stylename
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direction: 'above', 'below', 'left', 'right', or 'flush'
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command: callback
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tixCommanda� The tix commands provide access to miscellaneous elements
of Tix's internal state and the Tix application context.
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to the application as a whole, or to a screen or
display, rather than to a particular window.
This is a mixin class, assumed to be mixed to Tkinter.Tk
that supports the self.tk.call method.
c C s | j �dd|�S )a� Tix maintains a list of directories under which
the tix_getimage and tix_getbitmap commands will
search for image files. The standard bitmap directory
is $TIX_LIBRARY/bitmaps. The addbitmapdir command
adds directory into this list. By using this
command, the image files of an applications can
also be located using the tix_getimage or tix_getbitmap
command.
�tixZ addbitmapdir��tk�call)�selfZ directory� r �#/usr/lib64/python3.8/tkinter/tix.py�tix_addbitmapdirR s
ztixCommand.tix_addbitmapdirc C s | j �dd|�S )z�Returns the current value of the configuration
option given by option. Option may be any of the
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r �cgetr �r �optionr r r �tix_cget^ s ztixCommand.tix_cgetNc K sd |rt ||f�}n |r t |�}|dkr2| �dd�S t|t�rN| �ddd| �S | j�d| �|� �S )a� Query or modify the configuration options of the Tix application
context. If no option is specified, returns a dictionary all of the
available options. If option is specified with no value, then the
command returns a list describing the one named option (this list
will be identical to the corresponding sublist of the value
returned if no option is specified). If one or more option-value
pairs are specified, then the command modifies the given option(s)
to have the given value(s); in this case the command returns an
empty string. Option may be any of the configuration options.
Nr � configure�-)r r )r �
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different calls from this application. This command will create a
file selection dialog widget when it is called the first time. This
dialog will be returned by all subsequent calls to tix_filedialog.
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of file selection dialog widget is desired. Possible options are
tix FileSelectDialog or tixExFileSelectDialog.
Nr Z
filedialogr )r Zdlgclassr r r �tix_filedialog{ s ztixCommand.tix_filedialogc C s | j �dd|�S )a� Locates a bitmap file of the name name.xpm or name in one of the
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bitmap files in your application. When successful, it returns the
complete pathname of the bitmap file, prefixed with the character
'@'. The returned value can be used to configure the -bitmap
option of the TK and Tix widgets.
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tix_getbitmap� s ztixCommand.tix_getbitmapc C s | j �dd|�S )a� Locates an image file of the name name.xpm, name.xbm or name.ppm
in one of the bitmap directories (see the addbitmapdir command
above). If more than one file with the same name (but different
extensions) exist, then the image type is chosen according to the
depth of the X display: xbm images are chosen on monochrome
displays and color images are chosen on color displays. By using
tix_ getimage, you can avoid hard coding the pathnames of the
image files in your application. When successful, this command
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configure the -image option of the Tk and Tix widgets.
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scheme mechanism. Available options include:
active_bg active_fg bg
bold_font dark1_bg dark1_fg
dark2_bg dark2_fg disabled_fg
fg fixed_font font
inactive_bg inactive_fg input1_bg
input2_bg italic_font light1_bg
light1_fg light2_bg light2_fg
menu_font output1_bg output2_bg
select_bg select_fg selector
r r �getr r+ r r r �tix_option_get� s ztixCommand.tix_option_getc C s2 |dk r | j �dd|||�S | j �dd||�S dS )a� Resets the scheme and fontset of the Tix application to
newScheme and newFontSet, respectively. This affects only those
widgets created after this call. Therefore, it is best to call the
resetoptions command before the creation of any widgets in a Tix
application.
The optional parameter newScmPrio can be given to reset the
priority level of the Tk options set by the Tix schemes.
Because of the way Tk handles the X option database, after Tix has
been has imported and inited, it is not possible to reset the color
schemes and font sets using the tix config command. Instead, the
tix_resetoptions command must be used.
Nr Z resetoptionsr )r Z newSchemeZ
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newScmPrior r r �tix_resetoptions� s ztixCommand.tix_resetoptions)N)N)N) �__name__�
__module__� __qualname__�__doc__r r r) r* r- r. r0 r1 r r r r r G s
r c @ s" e Zd ZdZddd�Zdd� ZdS ) �Tkz{Toplevel widget of Tix which represents mostly the main window
of an application. It has an associated Tcl interpreter.N�Tixc C sb t j�| |||� tj�d�}| j�d� |d k rR| j�d| � | j�d| � | j�d� d S )NZ TIX_LIBRARYz<global auto_path; lappend auto_path [file dir [info nameof]]z(global auto_path; lappend auto_path {%s}z,global tcl_pkgPath; lappend tcl_pkgPath {%s}zpackage require Tix)�tkinterr6 �__init__�os�environr/ r �eval)r Z
screenNameZbaseNameZ classNameZtixlibr r r r9 � s z Tk.__init__c C s | � dd� tj�| � d S )NZWM_DELETE_WINDOW� )Zprotocolr8 r6 �destroy�r r r r r> � s z
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Form.checkc C s | j �dd| j� d S )NrB �forgetrM r? r r r rN � s z Form.forgetr c C s` |sJ|sJ| j �dd| j�}| j �|�}d}|D ]}|| j �|�f }q.|S | j �dd| j||�S )NrB �gridr )r r rD � splitlistZgetint)r ZxsizeZysize�x�y�zr r r rO � s z Form.gridNc C s> |s| j �dd| j�S |d dkr*d| }| j �dd| j|�S )NrB �infor r! rM r r r r rT � s
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dS )� TixWidgetaQ A TixWidget class is used to package all (or most) Tix widgets.
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1) It is possible to give a list of options which must be part of
the creation command (so called Tix 'static' options). These cannot be
given as a 'config' command later.
2) It is possible to give the name of an existing TK widget. These are
child widgets created automatically by a Tix mega-widget. The Tk call
to create these widgets is therefore bypassed in TixWidget.__init__
Both options are for use by subclasses only.
Nc C s� |rt ||f�}nt |�}d}|r.|�d� ndg}t|�� �D ]&\}}||kr@|d| |f }||= q@|| _t�| ||� |r�| jj|| j f|�� |r�t�
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widgetName�Widget�_setupr r rD rE �subwidget_list) r �masterr` Zstatic_optionsr' r( Zextra�k�vr r r r9 s$ zTixWidget.__init__c C s || j kr| j | S t|��d S rF )rc �AttributeErrorr+ r r r � __getattr__G s
zTixWidget.__getattr__c C s | j �d| j|� dS )z1Set a variable without calling its action routineZ tixSetSilentNrM )r rJ r r r �
set_silentL s zTixWidget.set_silentc C sD | � |�}|s$td| d | j ��|t| j�d d� }| �|�S )zSReturn the named subwidget (which must have been created by
the sub-class).z
Subwidget z not child of � N)�_subwidget_name�TclError�_name�lenrD rU )r r, �nr r r � subwidgetP s
zTixWidget.subwidgetc C sZ | � � }|sg S g }|D ]<}|t| j�d d� }z|�| �|�� W q Y qX q|S )zReturn all subwidgets.rj N)�_subwidget_namesrn rD r] rU )r �namesZretlistr, r r r �subwidgets_allZ s zTixWidget.subwidgets_allc C s0 z| j �| jd|�W S tk
r* Y dS X dS )z7Get a subwidget name (returns a String, not a Widget !)rp N)r r rD rl r+ r r r rk i s zTixWidget._subwidget_namec C s< z | j �| jdd�}| j �|�W S tk
r6 Y dS X dS )z"Return the name of all subwidgets.Z
subwidgetsz-allN)r r rD rP rl )r rQ r r r rq p s
zTixWidget._subwidget_namesc C s\ |dkr dS t |t�s t|�}t |t�s0t|�}| �� }|D ]}| j�|dd| |� q<dS )z8Set configuration options for all subwidgets (and self).r= Nr r! )r# r$ �reprrq r r )r r rJ rr r, r r r �
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zTixWidget.config_allc K st |s| }|r |r t ||f�}n|r&|}d}|�� D ]*\}}t|�rL| �|�}|d| |f }q2|j�dd|f| �S )Nr r! r �create)r r_ �callable� _registerr r )r Zimgtyper' rd r( r\ re rf r r r � image_create� s
zTixWidget.image_createc C s. z| j �dd|� W n tk
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r[ c @ s" e Zd ZdZddd�Zdd� ZdS ) � TixSubWidgetz�Subwidget class.
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of this)rj c
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�zTixSubWidget.__init__c C sj t | j�� �D ] }|�� q| j| jjkr6| jj| j= | j| jjkrP| jj| j= | jrf| j� d| j
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dS )� DisplayStylezRDisplayStyle - handle configuration options shared by
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�zDisplayStyle.__init__c C s | j S rF )r� r? r r r �__str__� s zDisplayStyle.__str__c C sH |r|rt ||f�}n|r |}d}|�� D ]\}}|d| |f }q*|S )Nr r! )r r_ )r r' r( Zoptsre rf r r r r% � s zDisplayStyle._optionsc C s | j �| jd� d S �Nrz �r r r� r? r r r rz � s zDisplayStyle.deletec C s | j �| jdd| |� d S )Nr �-%sr� rH r r r rK � s zDisplayStyle.__setitem__c K s | j | jdf| �||��� S )Nr )r" r� r% r& r r r rE � s �
�zDisplayStyle.configc C s | j �| jdd| �S )Nr r� r� )r rI r r r � __getitem__� s zDisplayStyle.__getitem__) r2 r3 r4 r5 r9 r� r% rz rK rE r� r r r r r� � s
r� c @ s2 e Zd ZdZdi fdd�Zi fdd�Zdd� ZdS ) �BalloonzBalloon help widget.
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label Label
message MessageNc K sN dddddg}t �| |d|||� t| ddd �| jd< t| d
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unbind_widget s zBalloon.unbind_widget)r2 r3 r4 r5 r9 r� r� r r r r r� s
r� c @ s2 e Zd ZdZdi fdd�Zi fdd�Zdd� ZdS ) � ButtonBoxzgButtonBox - A container for pushbuttons.
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�zButtonBox.__init__c K s4 | j j| jd|f| �||��� }t| |�| j|< |S )z$Add a button with given name to box.�add�r r rD r% � _dummyButtonrc )r r, r' r( Zbtnr r r r� # s z
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entry Entry
arrow Button
slistbox ScrolledListBox
tick Button
cross Button : present if created with the fancy optionNc K s� t �| |dddddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d �| jd < z$t| d
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r� Y nX d S ) NZ tixComboBoxZeditableZdropdown�fancyr\ r� �entry�arrow�slistbox�tick�cross)r[ r9 r� rc � _dummyEntryr� �_dummyScrolledListBox� TypeErrorr� r r r r9 < s
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appendhistoryrM r� r r r �append_historyQ s zComboBox.append_historyc C s | j �| jd||� d S �N�insertrM )r �indexr$ r r r r� T s zComboBox.insertc C s | j �| jd|� d S )N�pickrM �r r� r r r r� W s z
ComboBox.pick) r2 r3 r4 r5 r9 r� r� r� r� r r r r r� . s
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�Controla� Control - An entry field with value change arrows. The user can
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against the user-defined upper and lower limits.
Subwidget Class
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incr Button
decr Button
entry Entry
label LabelNc K sZ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ
tixControlr\ �incr�decrr� r� )r[ r9 r� rc r� r� r� r r r r9 h s
zControl.__init__c C s | j �| jd� d S )Nr� rM r? r r r � decremento s zControl.decrementc C s | j �| jd� d S )Nr� rM r? r r r � incrementr s zControl.incrementc C s | j �| jd� d S r� rM r? r r r r� u s zControl.invokec C s | j �| jd� d S )N�updaterM r? r r r r� x s zControl.update) r2 r3 r4 r5 r9 r� r� r� r� r r r r r� Z s
r� c @ s$ e Zd ZdZi fdd�Zdd� ZdS )�DirListaR DirList - displays a list view of a directory, its previous
directories and its sub-directories. The user can choose one of
the directories displayed in the list or change to another directory.
Subwidget Class
--------- -----
hlist HList
hsb Scrollbar
vsb Scrollbarc K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ
tixDirListr\ �hlist�vsb�hsb�r[ r9 � _dummyHListrc �_dummyScrollbarr� r r r r9 � s zDirList.__init__c C s | j �| jd|� d S �N�chdirrM �r �dirr r r r� � s z
DirList.chdirN�r2 r3 r4 r5 r9 r� r r r r r� { s r� c @ s$ e Zd ZdZi fdd�Zdd� ZdS )�DirTreea� DirTree - Directory Listing in a hierarchical view.
Displays a tree view of a directory, its previous directories and its
sub-directories. The user can choose one of the directories displayed
in the list or change to another directory.
Subwidget Class
--------- -----
hlist HList
hsb Scrollbar
vsb Scrollbarc K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ
tixDirTreer\ r� r� r� r� r� r r r r9 � s zDirTree.__init__c C s | j �| jd|� d S r� rM r� r r r r� � s z
DirTree.chdirNr� r r r r r� � s r� c @ s e Zd ZdZi fdd�ZdS )� DirSelectBoxa� DirSelectBox - Motif style file select box.
It is generally used for
the user to choose a file. FileSelectBox stores the files mostly
recently selected into a ComboBox widget so that they can be quickly
selected again.
Subwidget Class
--------- -----
selection ComboBox
filter ComboBox
dirlist ScrolledListBox
filelist ScrolledListBoxc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZtixDirSelectBoxr\ �dirlist�dircbx)r[ r9 �
_dummyDirListrc �_dummyFileComboBoxr� r r r r9 � s zDirSelectBox.__init__N�r2 r3 r4 r5 r9 r r r r r� � s
r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �ExFileSelectBoxa� ExFileSelectBox - MS Windows style file select box.
It provides a convenient method for the user to select files.
Subwidget Class
--------- -----
cancel Button
ok Button
hidden Checkbutton
types ComboBox
dir ComboBox
file ComboBox
dirlist ScrolledListBox
filelist ScrolledListBoxc K s� t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d �| jd < t| d
�| jd
< d S ) NZtixExFileSelectBoxr\ �cancel�ok�hidden�typesr� r� �file�filelist)r[ r9 r� rc �_dummyCheckbutton�_dummyComboBoxr� r� r� r r r r9 � s zExFileSelectBox.__init__c C s | j �| jd� d S �N�filterrM r? r r r r� � s zExFileSelectBox.filterc C s | j �| jd� d S r� rM r? r r r r� � s zExFileSelectBox.invokeN)r2 r3 r4 r5 r9 r� r� r r r r r� � s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �DirSelectDialoga# The DirSelectDialog widget presents the directories in the file
system in a dialog window. The user can use this dialog window to
navigate through the file system to select the desired directory.
Subwidgets Class
---------- -----
dirbox DirSelectDialogc K s* t �| |ddg||� t| d�| jd< d S )NZtixDirSelectDialogr\ Zdirbox)r[ r9 �_dummyDirSelectBoxrc r� r r r r9 � s
�zDirSelectDialog.__init__c C s | j �| jd� d S �N�popuprM r? r r r r� � s zDirSelectDialog.popupc C s | j �| jd� d S �N�popdownrM r? r r r r� � s zDirSelectDialog.popdownN�r2 r3 r4 r5 r9 r� r� r r r r r� � s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �ExFileSelectDialogz�ExFileSelectDialog - MS Windows style file select dialog.
It provides a convenient method for the user to select files.
Subwidgets Class
---------- -----
fsbox ExFileSelectBoxc K s* t �| |ddg||� t| d�| jd< d S )NZtixExFileSelectDialogr\ �fsbox)r[ r9 �_dummyExFileSelectBoxrc r� r r r r9 � s
�zExFileSelectDialog.__init__c C s | j �| jd� d S r� rM r? r r r r� s zExFileSelectDialog.popupc C s | j �| jd� d S r� rM r? r r r r� s zExFileSelectDialog.popdownNr� r r r r r� � s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �
FileSelectBoxa� ExFileSelectBox - Motif style file select box.
It is generally used for
the user to choose a file. FileSelectBox stores the files mostly
recently selected into a ComboBox widget so that they can be quickly
selected again.
Subwidget Class
--------- -----
selection ComboBox
filter ComboBox
dirlist ScrolledListBox
filelist ScrolledListBoxc K sZ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixFileSelectBoxr\ r� r� r� � selection)r[ r9 r� rc r� r� r r r r9 s
zFileSelectBox.__init__c C s | j �| jd� d S r� rM r? r r r � apply_filter s zFileSelectBox.apply_filterc C s | j �| jd� d S r� rM r? r r r r� s zFileSelectBox.invokeN)r2 r3 r4 r5 r9 r� r� r r r r r� s
r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) �FileSelectDialogz�FileSelectDialog - Motif style file select dialog.
Subwidgets Class
---------- -----
btns StdButtonBox
fsbox FileSelectBoxc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZtixFileSelectDialogr\ Zbtnsr� )r[ r9 �_dummyStdButtonBoxrc �_dummyFileSelectBoxr� r r r r9 , s
�zFileSelectDialog.__init__c C s | j �| jd� d S r� rM r? r r r r� 2 s zFileSelectDialog.popupc C s | j �| jd� d S r� rM r? r r r r� 5 s zFileSelectDialog.popdownNr� r r r r r� # s r� c @ s, e Zd ZdZi fdd�Zdd� Zdd� ZdS ) � FileEntrya_ FileEntry - Entry field with button that invokes a FileSelectDialog.
The user can type in the filename manually. Alternatively, the user can
press the button widget that sits next to the entry, which will bring
up a file selection dialog.
Subwidgets Class
---------- -----
button Button
entry Entryc K s< t �| |dddg||� t| d�| jd< t| d�| jd< d S )NZ tixFileEntryZ
dialogtyper\ Zbuttonr� )r[ r9 r� rc r� r� r r r r9 D s
�zFileEntry.__init__c C s | j �| jd� d S r� rM r? r r r r� J s zFileEntry.invokec C s d S rF r r? r r r � file_dialogM s zFileEntry.file_dialogN)r2 r3 r4 r5 r9 r� r� r r r r r� 8 s r� c @ s� e Zd ZdZdi fdd�Zi fdd�Zdi fdd�Zd d
� Zd d � Zdldd�Z dd� Z
dd� Z dd� Z dd� Z
dd� Zdd� Zd d � Zd d � Zi fd d!�Zi fd"d#�Zd$d%� Zd&d'� ZeZd(d)� Zd*d+� Zd,d-� Zi fd.d/�Zi fd0d1�Zd2d3� Z d4d5� Z d6d7� Z d8d9� Z d:d;� Z d<d=� Z!dmd>d?�Z"d@dA� Z#dBdC� Z$dDdE� Z%dFdG� Z&dHdI� Z'dJdK� Z(dLdM� Z)dNdO� Z*dPdQ� Z+dRdS� Z,i fdTdU�Z-i fdVdW�Z.dXdY� Z/dZd[� Z0d\d]� Z1i fd^d_�Z2d`da� Z3dbdc� Z4i fddde�Z5dfdg� Z6dndhdi�Z7djdk� Z8dS )o�HLista HList - Hierarchy display widget can be used to display any data
that have a hierarchical structure, for example, file system directory
trees. The list entries are indented and connected by branch lines
according to their places in the hierarchy.
Subwidgets - NoneNc K s t �| |dddg||� d S )NZtixHList�columnsr\ r� r� r r r r9 Y s
�zHList.__init__c K s | j j| jd|f| �||��� S �Nr� rC �r r� r' r( r r r r� ] s z HList.addc K s( |sd}| j j| jd|f| �||��� S )Nr= ZaddchildrC )r r� r' r( r r r � add_child` s �
�zHList.add_childc C s | j �| jdd|� d S �N�anchor�setrM �r r� r r r �
anchor_setf s zHList.anchor_setc C s | j �| jdd� d S �Nr� �clearrM r? r r r � anchor_cleari s zHList.anchor_clearr c C s6 |s| j �| jdd||�S | j �| jdd|d|�S d S )Nr �widthz-charrM )r �colr �charsr r r � column_widthl s �zHList.column_widthc C s | j �| jdd� d S )Nrz �allrM r? r r r �
delete_alls s zHList.delete_allc C s | j �| jdd|� d S )Nrz r� rM r� r r r � delete_entryv s zHList.delete_entryc C s | j �| jdd|� d S )Nrz Z
offspringsrM r� r r r �delete_offspringsy s zHList.delete_offspringsc C s | j �| jdd|� d S )Nrz ZsiblingsrM r� r r r �delete_siblings| s zHList.delete_siblingsc C s | j �| jdd|� d S �N�dragsiter� rM r� r r r � dragsite_set s zHList.dragsite_setc C s | j �| jdd� d S �Nr r rM r? r r r �dragsite_clear� s zHList.dragsite_clearc C s | j �| jdd|� d S �N�dropsiter� rM r� r r r � dropsite_set� s zHList.dropsite_setc C s | j �| jdd� d S �Nr r rM r? r r r �dropsite_clear� s zHList.dropsite_clearc K s& | j j| jdd|f| �||��� d S )N�headerrv rC �r r r' r( r r r �
header_create� s zHList.header_createc K s@ |d kr| � | jdd|�S | jj| jdd|f| �||��� d S )Nr r �r" rD r r r% r r r r �header_configure� s
�zHList.header_configurec C s | j �| jdd||�S )Nr r rM )r r �optr r r � header_cget� s zHList.header_cgetc C s | j �| j �| jdd|��S )Nr Zexist)r Z
getbooleanr rD �r r r r r �
header_exists� s zHList.header_existsc C s | j �| jdd|� d S )Nr rz rM r r r r �
header_delete� s zHList.header_deletec C s | j �| jdd|�S )Nr �sizerM r r r r � header_size� s zHList.header_sizec C s | j �| jdd|� d S )N�hider� rM r� r r r �
hide_entry� s zHList.hide_entryc K s& | j j| jdd|f| �||��� d S )N� indicatorrv rC r� r r r �indicator_create� s �
�zHList.indicator_createc K s@ |d kr| � | jdd|�S | jj| jdd|f| �||��� d S )Nr# r r r� r r r �indicator_configure� s � �
�zHList.indicator_configurec C s | j �| jdd||�S )Nr# r rM �r r� r r r r �indicator_cget� s zHList.indicator_cgetc C s | j �| jdd|�S )Nr# �existsrM r� r r r �indicator_exists� s zHList.indicator_existsc C s | j �| jdd|� d S )Nr# rz rM r� r r r �indicator_delete� s zHList.indicator_deletec C s | j �| jdd|�S )Nr# r rM r� r r r �indicator_size� s zHList.indicator_sizec C s | j �| jdd�S �NrT r� rM r? r r r � info_anchor� s zHList.info_anchorc C s | � | j�| jdd|��p d S �NrT Zbbox)�_getintsr r rD r� r r r � info_bbox� s
��zHList.info_bboxc C s | j �| jdd|�}| j �|�S )NrT r� �r r rD rP )r r� r� r r r �
info_children� s zHList.info_childrenc C s | j �| jdd|�S )NrT �datarM r� r r r � info_data� s zHList.info_datac C s | j �| jdd�S )NrT r rM r? r r r �
info_dragsite� s zHList.info_dragsitec C s | j �| jdd�S )NrT r rM r? r r r �
info_dropsite� s zHList.info_dropsitec C s | j �| jdd|�S )NrT r( rM r� r r r � info_exists� s zHList.info_existsc C s | j �| jdd|�S )NrT r� rM r� r r r � info_hidden� s zHList.info_hiddenc C s | j �| jdd|�S )NrT �nextrM r� r r r � info_next� s zHList.info_nextc C s | j �| jdd|�S )NrT r� rM r� r r r � info_parent� s zHList.info_parentc C s | j �| jdd|�S )NrT �prevrM r� r r r � info_prev� s zHList.info_prevc C s | j �| jdd�}| j �|�S �NrT r� r1 r� r r r �info_selection� s zHList.info_selectionc C s | j �| jdd|||�S )N�itemr rM )r r� r r r r r � item_cget� s zHList.item_cgetc K sD |d kr | � | jdd||�S | jj| jdd||f| �||��� d S )Nr@ r r �r r� r r' r( r r r �item_configure� s
�zHList.item_configurec K s( | j j| jdd||f| �||��� d S )Nr@ rv rC rB r r r � item_create� s �
�zHList.item_createc C s | j �| jdd||�S )Nr@ r( rM �r r� r r r r � item_exists� s zHList.item_existsc C s | j �| jdd||� d S )Nr@ rz rM rE r r r � item_delete� s zHList.item_deletec C s | j �| jd||�S )N� entrycgetrM r& r r r rH � s zHList.entrycgetc K s< |d kr| � | jd|�S | jj| jd|f| �||��� d S �N�entryconfigurer r� r r r rJ � s
�zHList.entryconfigurec C s | j �| jd|�S �N�nearestrM )r rR r r r rL s z
HList.nearestc C s | j �| jd|� d S �N�seerM r� r r r rN s z HList.seec K s$ | j j| jddf| �||��� d S �Nr� r rC r& r r r �selection_clear s zHList.selection_clearc C s | j �| jdd|�S �Nr� ZincludesrM r� r r r �selection_includes
s zHList.selection_includesc C s | j �| jdd||� d S �Nr� r� rM �r �firstZlastr r r �
selection_set
s zHList.selection_setc C s | j �| jdd|�S )N�showr� rM r� r r r �
show_entry s zHList.show_entry)r NN)N)N)9r2 r3 r4 r5 r9 r� r� r� r r r r r r
r
r r r r r r r Z header_existr r r" r$ r% r' r) r* r+ r- r0 r2 r4 r5 r6 r7 r8 r: r; r= r? rA rC rD rF rG rH rJ rL rN rP rR rV rX r r r r r� Q sl
r� c @ s e Zd ZdZdi fdd�ZdS )� InputOnlyz?InputOnly - Invisible widget. Unix only.
Subwidgets - NoneNc K s t �| |dd ||� d S )NZ tixInputOnlyr� r� r r r r9 s zInputOnly.__init__r� r r r r rY s rY c @ s e Zd ZdZdi fdd�ZdS )�
LabelEntrya LabelEntry - Entry field with label. Packages an entry widget
and a label into one mega widget. It can be used to simplify the creation
of ``entry-form'' type of interface.
Subwidgets Class
---------- -----
label Label
entry EntryNc K s< t �| |dddg||� t| d�| jd< t| d�| jd< d S )NZ
tixLabelEntry� labelsider\ r� r� )r[ r9 r� rc r� r� r r r r9 % s
�zLabelEntry.__init__r� r r r r rZ s rZ c @ s e Zd ZdZdi fdd�ZdS )�
LabelFrameae LabelFrame - Labelled Frame container. Packages a frame widget
and a label into one mega widget. To create widgets inside a
LabelFrame widget, one creates the new widgets relative to the
frame subwidget and manage them inside the frame subwidget.
Subwidgets Class
---------- -----
label Label
frame FrameNc K s< t �| |dddg||� t| d�| jd< t| d�| jd< d S )NZ
tixLabelFramer[ r\ r� �frame)r[ r9 r� rc � _dummyFramer� r r r r9 6 s
�zLabelFrame.__init__r� r r r r r\ + s
r\ c @ s@ e Zd ZdZi fdd�Zi fdd�Zdd� Zdd � Zd
d � Zd S )
� ListNoteBooka A ListNoteBook widget is very similar to the TixNoteBook widget:
it can be used to display many windows in a limited space using a
notebook metaphor. The notebook is divided into a stack of pages
(windows). At one time only one of these pages can be shown.
The user can navigate through these pages by
choosing the name of the desired page in the hlist subwidget.c K sN t �| |ddg||� t| ddd�| jd< t| d�| jd< t| d�| jd< d S )NZtixListNoteBookr\ Zpaner r� r� Zshlist)r[ r9 �_dummyPanedWindowrc r� �_dummyScrolledHListr� r r r r9 E s � zListNoteBook.__init__c K s: | j j| jd|f| �||��� t| |�| j|< | j| S r� �r r rD r% r| rc �r r, r' r( r r r r� M s zListNoteBook.addc C s
| � |�S rF �rp r+ r r r �pageR s zListNoteBook.pagec C s: | j �| j �| jd��}g }|D ]}|�| �|�� q |S �N�pages�r rP r rD r] rp �r rr ZretrQ r r r rg U s
zListNoteBook.pagesc C s | j �| jd|� d S �N�raiserM r+ r r r �
raise_page] s zListNoteBook.raise_pageN) r2 r3 r4 r5 r9 r� re rg rl r r r r r_ = s r_ c @ s e Zd ZdZdi fdd�ZdS )�MeterzuThe Meter widget can be used to show the progress of a background
job which may take a long time to execute.
Nc K s t �| |ddg||� d S )NZtixMeterr\ r� r� r r r r9 e s
�zMeter.__init__r� r r r r rm ` s rm c @ sR e Zd ZdZdi fdd�Zi fdd�Zdd� Zd d
� Zd d � Zd
d� Z dd� Z
dS )�NoteBookz�NoteBook - Multi-page container widget (tabbed notebook metaphor).
Subwidgets Class
---------- -----
nbframe NoteBookFrame
<pages> page widgets added dynamically with the add methodNc K s. t �| |ddg||� t| ddd�| jd< d S )NZ tixNoteBookr\ Znbframer r� )r[ r9 r| rc r� r r r r9 q s �zNoteBook.__init__c K s: | j j| jd|f| �||��� t| |�| j|< | j| S r� rb rc r r r r� v s z NoteBook.addc C s, | j �| jd|� | j| �� | j|= d S r� �r r rD rc r> r+ r r r rz { s zNoteBook.deletec C s
| � |�S rF rd r+ r r r re � s z
NoteBook.pagec C s: | j �| j �| jd��}g }|D ]}|�| �|�� q |S rf rh ri r r r rg � s
zNoteBook.pagesc C s | j �| jd|� d S rj rM r+ r r r rl � s zNoteBook.raise_pagec C s | j �| jd�S )N�raisedrM r? r r r rp � s zNoteBook.raised) r2 r3 r4 r5 r9 r� rz re rg rl rp r r r r rn i s rn c @ s e Zd ZdS )�
NoteBookFrameN)r2 r3 r4 r r r r rq � s rq c @ sL e Zd ZdZi fdd�Zi fdd�Zi fdd�Zdd � Zd
d � Zd d
� Z dS )�
OptionMenuz�OptionMenu - creates a menu button of options.
Subwidget Class
--------- -----
menubutton Menubutton
menu Menuc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZ
tixOptionMenur\ �
menubutton�menu�r[ r9 �_dummyMenubuttonrc �
_dummyMenur� r r r r9 � s zOptionMenu.__init__c K s& | j j| jdd|f| �||��� d S )Nr� �commandrC rc r r r � add_command� s zOptionMenu.add_commandc K s& | j j| jdd|f| �||��� d S )Nr� Z separatorrC rc r r r �
add_separator� s zOptionMenu.add_separatorc C s | j �| jd|� d S r� rM r+ r r r rz � s zOptionMenu.deletec C s | j �| jd|� d S )N�disablerM r+ r r r r{ � s zOptionMenu.disablec C s | j �| jd|� d S )N�enablerM r+ r r r r| � s zOptionMenu.enableN)
r2 r3 r4 r5 r9 ry rz rz r{ r| r r r r rr � s rr c @ sT e Zd ZdZi fdd�Zi fdd�Zdd� Zdd � Zd
d � Zi fd d
�Z dd� Z
dS )� PanedWindowa� PanedWindow - Multi-pane container widget
allows the user to interactively manipulate the sizes of several
panes. The panes can be arranged either vertically or horizontally.The
user changes the sizes of the panes by dragging the resize handle
between two panes.
Subwidgets Class
---------- -----
<panes> g/p widgets added dynamically with the add method.c K s t �| |dddg||� d S )NZtixPanedWindowr� r\ r� r� r r r r9 � s zPanedWindow.__init__c K s> | j j| jd|f| �||��� t| |dd�| j|< | j| S )Nr� r )r rb rc r r r r� � s
� zPanedWindow.addc C s, | j �| jd|� | j| �� | j|= d S r� ro r+ r r r rz � s zPanedWindow.deletec C s | j �| jd|� d S )NrN rM r+ r r r rN � s zPanedWindow.forgetc C s | j �| jd||�S )N�panecgetrM r& r r r r~ � s zPanedWindow.panecgetc K s< |d kr| � | jd|�S | jj| jd|f| �||��� d S )N�
paneconfigurer r� r r r r � s zPanedWindow.paneconfigurec s* � j �� j �� jd��}� fdd�|D �S )N�panesc s g | ]}� � |��qS r rd rV r? r r rX � s z%PanedWindow.panes.<locals>.<listcomp>rZ )r rr r r? r r� � s zPanedWindow.panesN) r2 r3 r4 r5 r9 r� rz rN r~ r r� r r r r r} � s
r} c @ s4 e Zd ZdZi fdd�Zdd� Zdd� Zdd � Zd
S ) � PopupMenua PopupMenu widget can be used as a replacement of the tk_popup command.
The advantage of the Tix PopupMenu widget is it requires less application
code to manipulate.
Subwidgets Class
---------- -----
menubutton Menubutton
menu Menuc K s: t �| |ddg||� t| d�| jd< t| d�| jd< d S )NZ tixPopupMenur\ rs rt ru r� r r r r9 � s zPopupMenu.__init__c C s | j �| jd|j� d S )Nr� rM r� r r r r� � s zPopupMenu.bind_widgetc C s | j �| jd|j� d S r� rM r� r r r r� � s zPopupMenu.unbind_widgetc C s | j �| jd|j||� d S )NZpostrM )r r� rQ rR r r r � post_widget� s zPopupMenu.post_widgetN)r2 r3 r4 r5 r9 r� r� r� r r r r r� � s
r� c @ s< e Zd ZdZi fdd�Zdd� Zdd� Zdd � Zd
d � Zd S )
� ResizeHandlez;Internal widget to draw resize handles on Scrolled widgets.c K s. ddddddddd g }t �| |d
|||� d S ) Nr\ rx ZcursorfgZcursorbgZ
handlesizeZ hintcolorZ hintwidthrQ rR ZtixResizeHandler� )r rd r' r( �flagsr r r r9 � s �
�zResizeHandle.__init__c C s | j �| jd|j� d S )NZ attachwidgetrM r� r r r �
attach_widget s zResizeHandle.attach_widgetc C s | j �| jd|j� d S )NZ detachwidgetrM r� r r r �
detach_widget s zResizeHandle.detach_widgetc C s | j �| jd|j� d S )Nr! rM r� r r r r! s zResizeHandle.hidec C s | j �| jd|j� d S )NrW rM r� r r r rW s zResizeHandle.showN) r2 r3 r4 r5 r9 r� r� r! rW r r r r r� � s
r� c @ s e Zd ZdZi fdd�ZdS )�
ScrolledHListz0ScrolledHList - HList with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledHListr\ r� r� r� r� r� r r r r9 s �zScrolledHList.__init__Nr� r r r r r� s r� c @ s e Zd ZdZi fdd�ZdS )�ScrolledListBoxz4ScrolledListBox - Listbox with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledListBoxr\ �listboxr� r� )r[ r9 �
_dummyListboxrc r� r� r r r r9 s zScrolledListBox.__init__Nr� r r r r r� s r� c @ s e Zd ZdZi fdd�ZdS )� ScrolledTextz.ScrolledText - Text with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledTextr\ r r� r� )r[ r9 �
_dummyTextrc r� r� r r r r9 % s zScrolledText.__init__Nr� r r r r r� ! s r� c @ s e Zd ZdZi fdd�ZdS )�
ScrolledTListz0ScrolledTList - TList with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledTListr\ Ztlistr� r� )r[ r9 � _dummyTListrc r� r� r r r r9 / s �zScrolledTList.__init__Nr� r r r r r� + s r� c @ s e Zd ZdZi fdd�ZdS )�ScrolledWindowz2ScrolledWindow - Window with automatic scrollbars.c K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixScrolledWindowr\ r r� r� )r[ r9 r^ rc r� r� r r r r9 : s zScrolledWindow.__init__Nr� r r r r r� 6 s r� c @ s0 e Zd ZdZi fdd�Zi fdd�Zdd� ZdS ) �Selectz�Select - Container of button subwidgets. It can be used to provide
radio-box or check-box style of selection options for the user.
Subwidgets are buttons added dynamically using the add method.c
K s2 t �| |ddddddg||� t| d�| jd< d S )NZ tixSelectZ allowzero�radior� r[ r\ r� r� r� r r r r9 G s
� �zSelect.__init__c K s: | j j| jd|f| �||��� t| |�| j|< | j| S r� r� rc r r r r� N s z
Select.addc C s | j �| jd|� d S r� rM r+ r r r r� S s z
Select.invokeNr� r r r r r� @ s r� c @ s e Zd ZdZdi fdd�ZdS )�Shellz'Toplevel window.
Subwidgets - NoneNc K s t �| |dddg||� d S )NZtixShellr\ �titler� r� r r r r9 [ s zShell.__init__r� r r r r r� V s r� c @ s6 e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� ZdS ) � DialogShellz�Toplevel window, with popup popdown and center methods.
It tells the window manager that it is a dialog window and should be
treated specially. The exact treatment depends on the treatment of
the window manager.
Subwidgets - NoneNc K s& t �| |ddddddddg||� d S ) NZtixDialogShellr\ r� ZmappedZ minheightZminwidthr� Z transientr� r� r r r r9 g s � �zDialogShell.__init__c C s | j �| jd� d S r� rM r? r r r r� n s zDialogShell.popdownc C s | j �| jd� d S r� rM r? r r r r� q s zDialogShell.popupc C s | j �| jd� d S )N�centerrM r? r r r r� t s zDialogShell.center)r2 r3 r4 r5 r9 r� r� r� r r r r r� ^ s
r� c @ s& e Zd ZdZdi fdd�Zdd� ZdS )� StdButtonBoxz@StdButtonBox - Standard Button Box (OK, Apply, Cancel and Help) Nc K s\ t �| |dddg||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixStdButtonBoxr� r\ r� �applyr� �help)r[ r9 r� rc r� r r r r9 z s
�zStdButtonBox.__init__c C s || j kr | j�| jd|� d S r� r� r+ r r r r� � s
zStdButtonBox.invoke)r2 r3 r4 r5 r9 r� r r r r r� w s r� c @ s� e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd d � Zd3d
d�Z dd� Z
dd� Z dd� Z dd� Z
i fdd�Zdd� Zdd � Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� Zd'd(� Zd)d*� Zd+d,� Zi fd-d.�Zd/d0� Zd4d1d2�ZdS )5�TLista� TList - Hierarchy display widget which can be
used to display data in a tabular format. The list entries of a TList
widget are similar to the entries in the Tk listbox widget. The main
differences are (1) the TList widget can display the list entries in a
two dimensional format and (2) you can use graphical images as well as
multiple colors and fonts for the list entries.
Subwidgets - NoneNc K s t �| |ddg||� d S )NZtixTListr\ r� r� r r r r9 � s zTList.__init__c C s | j �| jdd|� d S )N�activer� rM r� r r r �
active_set� s zTList.active_setc C s | j �| jdd� d S )Nr� r rM r? r r r � active_clear� s zTList.active_clearc C s | j �| jdd|� d S r� rM r� r r r r� � s zTList.anchor_setc C s | j �| jdd� d S r� rM r? r r r r � s zTList.anchor_clearc C s | j �| jd||� d S r� rM �r �from_�tor r r rz � s z TList.deletec C s | j �| jdd|� d S r rM r� r r r r
� s zTList.dragsite_setc C s | j �| jdd� d S r rM r? r r r r � s zTList.dragsite_clearc C s | j �| jdd|� d S r rM r� r r r r � s zTList.dropsite_setc C s | j �| jdd� d S r rM r? r r r r � s zTList.dropsite_clearc K s$ | j j| jd|f| �||��� d S r� rC )r r� r' r( r r r r� � s z TList.insertc C s | j �| jdd�S )NrT r� rM r? r r r � info_active� s zTList.info_activec C s | j �| jdd�S r, rM r? r r r r- � s zTList.info_anchorc C s | j �| jdd|�S )NrT ZdownrM r� r r r � info_down� s zTList.info_downc C s | j �| jdd|�S )NrT �leftrM r� r r r � info_left� s zTList.info_leftc C s | j �| jdd|�S )NrT �rightrM r� r r r �
info_right� s zTList.info_rightc C s | j �| jdd�}| j �|�S r> r1 r� r r r r? � s zTList.info_selectionc C s | j �| jdd�S )NrT r rM r? r r r � info_size� s zTList.info_sizec C s | j �| jdd|�S )NrT ZuprM r� r r r �info_up� s z
TList.info_upc C s | j �| jd||�S rK rM �r rQ rR r r r rL � s z
TList.nearestc C s | j �| jd|� d S rM rM r� r r r rN � s z TList.seec K s$ | j j| jddf| �||��� d S rO rC r& r r r rP � s zTList.selection_clearc C s | j �| jdd|�S rQ rM r� r r r rR � s zTList.selection_includesc C s | j �| jdd||� d S rS rM rT r r r rV � s zTList.selection_set)N)N) r2 r3 r4 r5 r9 r� r� r� r rz r
r r r r� r� r- r� r� r� r? r� r� rL rN rP rR rV r r r r r� � s2
r� c @ sH e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd d � Zddd�Z dS )�Treez�Tree - The tixTree widget can be used to display hierarchical
data in a tree form. The user can adjust
the view of the tree by opening or closing parts of the tree.Nc K sJ t �| |ddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZtixTreer\ r� r� r� r� r� r r r r9 � s
�z
Tree.__init__c C s | j �| jd� dS �a This command calls the setmode method for all the entries in this
Tree widget: if an entry has no child entries, its mode is set to
none. Otherwise, if the entry has any hidden child entries, its mode is
set to open; otherwise its mode is set to close.� autosetmodeNrM r? r r r r� � s zTree.autosetmodec C s | j �| jd|� dS �z8Close the entry given by entryPath if its mode is close.�closeNrM �r � entrypathr r r r� � s z
Tree.closec C s | j �| jd|�S �z9Returns the current mode of the entry given by entryPath.�getmoderM r� r r r r� � s z Tree.getmodec C s | j �| jd|� dS �z6Open the entry given by entryPath if its mode is open.�openNrM r� r r r r� � s z Tree.open�nonec C s | j �| jd||� dS )a� This command is used to indicate whether the entry given by
entryPath has children entries and whether the children are visible. mode
must be one of open, close or none. If mode is set to open, a (+)
indicator is drawn next the entry. If mode is set to close, a (-)
indicator is drawn next the entry. If mode is set to none, no
indicators will be drawn for this entry. The default mode is none. The
open mode indicates the entry has hidden children and this entry can be
opened by the user. The close mode indicates that all the children of the
entry are now visible and the entry can be closed by the user.�setmodeNrM �r r� �moder r r r� � s
z Tree.setmode)r� )
r2 r3 r4 r5 r9 r� r� r� r� r� r r r r r� � s r� c @ sZ e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd d � Zddd�Z dd� Z
ddd�Z dS )� CheckListz�The CheckList widget
displays a list of items to be selected by the user. CheckList acts
similarly to the Tk checkbutton or radiobutton widgets, except it is
capable of handling many more items than checkbuttons or radiobuttons.
Nc K sL t �| |dddg||� t| d�| jd< t| d�| jd< t| d�| jd< d S )NZ tixCheckListr\ r� r� r� r� r� r� r r r r9 s
�zCheckList.__init__c C s | j �| jd� dS r� rM r? r r r r� s zCheckList.autosetmodec C s | j �| jd|� dS r� rM r� r r r r� s zCheckList.closec C s | j �| jd|�S r� rM r� r r r r� s zCheckList.getmodec C s | j �| jd|� dS r� rM r� r r r r� $ s zCheckList.open�onc C s | j �| j �| jd|��S )z�Returns a list of items whose status matches status. If status is
not specified, the list of items in the "on" status will be returned.
Mode can be on, off, default� getselectionrZ )r r� r r r r� ( s zCheckList.getselectionc C s | j �| jd|�S )z(Returns the current status of entryPath.� getstatusrM r� r r r r� . s zCheckList.getstatusc C s | j �| jd||� dS )z~Sets the status of entryPath to be status. A bitmap will be
displayed next to the entry its status is on, off or default.� setstatusNrM r� r r r r� 2 s zCheckList.setstatus)r� )r� ) r2 r3 r4 r5 r9 r� r� r� r� r� r� r� r r r r r� s
r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF �r| r9 �r rd r, r~ r r r r9 > s z_dummyButton.__init__N)rj �r2 r3 r4 r9 r r r r r� = s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 B s z_dummyCheckbutton.__init__N)rj r� r r r r r� A s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 F s z_dummyEntry.__init__N)rj r� r r r r r� E s r� c @ s e Zd Zddd�ZdS )r^ rj c C s t �| |||� d S rF r� r� r r r r9 J s z_dummyFrame.__init__N)rj r� r r r r r^ I s r^ c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 N s z_dummyLabel.__init__N)rj r� r r r r r� M s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 R s z_dummyListbox.__init__N)rj r� r r r r r� Q s r� c @ s e Zd Zddd�ZdS )rw rj c C s t �| |||� d S rF r� r� r r r r9 V s z_dummyMenu.__init__N)rj r� r r r r rw U s rw c @ s e Zd Zddd�ZdS )rv rj c C s t �| |||� d S rF r� r� r r r r9 Z s z_dummyMenubutton.__init__N)rj r� r r r r rv Y s rv c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 ^ s z_dummyScrollbar.__init__N)rj r� r r r r r� ] s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 b s z_dummyText.__init__N)rj r� r r r r r� a s r� c @ s e Zd Zddd�ZdS )r� rj c C sD t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< d S )Nr� r� r� )r| r9 r� rc r� r� r r r r9 f s z _dummyScrolledListBox.__init__N)rj r� r r r r r� e s r� c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 m s z_dummyHList.__init__N)rj r� r r r r r� l s r� c @ s e Zd Zddd�ZdS )ra rj c C sD t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< d S �Nr� r� r� �r| r9 r� rc r� r� r r r r9 q s z _dummyScrolledHList.__init__N)rj r� r r r r ra p s ra c @ s e Zd Zddd�ZdS )r� rj c C s t �| |||� d S rF r� r� r r r r9 x s z_dummyTList.__init__N)rj r� r r r r r� w s r� c @ s e Zd Zddd�ZdS )r� rj c C s� t �| ||d|g� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< z$t| d�| jd< t| d�| jd< W n tk
r� Y nX d S )Nr� r� r� r� r� r� r� )r| r9 r� rc r� r� r� r� r� r r r r9 | s �
z_dummyComboBox.__init__N)rj r� r r r r r� { s r� c @ s e Zd Zddd�ZdS )r� rj c C sD t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< d S r� r� r� r r r r9 � s z_dummyDirList.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C s4 t �| |||� t| d�| jd< t| d�| jd< d S )Nr� r� )r| r9 r� rc r� r� r r r r9 � s z_dummyDirSelectBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C s� t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S ) Nr� r� r� r� r� r� r� r� )r| r9 r� rc r� r� r� r� r r r r9 � s z _dummyExFileSelectBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C sT t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )Nr� r� r� r� )r| r9 r� rc r� r� r r r r9 � s
z _dummyFileSelectBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C s$ t �| |||� t| d�| jd< d S )Nr� )r| r9 r� rc r� r r r r9 � s z_dummyFileComboBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r� rj c C sT t �| |||� t| d�| jd< t| d�| jd< t| d�| jd< t| d�| jd< d S )Nr� r� r� r� )r| r9 r� rc r� r r r r9 � s
z_dummyStdButtonBox.__init__N)rj r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )�_dummyNoteBookFramer c C s t �| |||� d S rF r� r� r r r r9 � s z _dummyNoteBookFrame.__init__N)r r� r r r r r� � s r� c @ s e Zd Zddd�ZdS )r` rj c C s t �| |||� d S rF r� r� r r r r9 � s z_dummyPanedWindow.__init__N)rj r� r r r r r` � s r` c C s | j �d| j�S )zzReturns the qualified path name for the widget. Normally used to set
default options for subwidgets. See tixwidgets.pyZ
tixOptionNamerM )r� r r r �
OptionName� s r� c C s: d}| � � D ](}|d | d | d | | d }q |S )Nr= z{{z} {z - z}} )�keys)�dict�s�typer r r � FileTypeList� s &r� c @ s e Zd ZdZdS )�CObjViewaB This file implements the Canvas Object View widget. This is a base
class of IconView. It implements automatic placement/adjustment of the
scrollbars according to the canvas objects inside the canvas subwidget.
The scrollbars are adjusted so that the canvas is just large enough
to see all the objects.
N)r2 r3 r4 r5 r r r r r� � s r� c @ s� e Zd ZdZdi fdd�Zdd� Zdd� Zd d
� Zd)d d �Zd*d
d�Z dd� Z
dd� Z dd� Z d+dd�Z
dd� Zdd� Zdd � Zd d � Zd d � Zd,d!d"�Zd#d$� Zd%d&� Zd'd(� ZdS )-�Grida} The Tix Grid command creates a new window and makes it into a
tixGrid widget. Additional options, may be specified on the command
line or in the option database to configure aspects such as its cursor
and relief.
A Grid widget displays its contents in a two dimensional grid of cells.
Each cell may contain one Tix display item, which may be in text,
graphics or other formats. See the DisplayStyle class for more information
about Tix display items. Individual cells, or groups of cells, can be
formatted with a wide range of attributes, such as its color, relief and
border.
Subwidgets - NoneNc K s" g }|| _ t�| |d|||� d S )NZtixGrid�r' r[ r9 r� r r r r9 � s z
Grid.__init__c C s | j �| dd� dS )z Removes the selection anchor.r� r Nr r? r r r r s zGrid.anchor_clearc C s | � | j�| dd��S )z3Get the (x,y) coordinate of the current anchor cellr� r/ �r/ r r r? r r r �
anchor_get s zGrid.anchor_getc C s | j �| dd||� dS )z/Set the selection anchor to the cell at (x, y).r� r� Nr r� r r r r� s zGrid.anchor_setc C s4 |dkr | j �| dd|� n| j �| dd||� dS )zdDelete rows between from_ and to inclusive.
If to is not provided, delete only row at from_Nrz r
r r� r r r �
delete_row s zGrid.delete_rowc C s4 |dkr | j �| dd|� n| j �| dd||� dS )zjDelete columns between from_ and to inclusive.
If to is not provided, delete only column at from_Nrz r r r� r r r �
delete_column s zGrid.delete_columnc C s | j �| dd� dS )zUIf any cell is being edited, de-highlight the cell and applies
the changes.�editr� Nr r? r r r �
edit_apply s zGrid.edit_applyc C s | j �| dd||� dS )zmHighlights the cell at (x, y) for editing, if the -editnotify
command returns True for this cell.r� r� Nr r� r r r �edit_set! s z
Grid.edit_setc C s, |r|d dkrd| }| j �| d|||�S )z&Get the option value for cell at (x,y)r r! rH r )r rQ rR r r r r rH & s zGrid.entrycgetc K s | � d||f||�S rI )Z
_configure)r rQ rR r' r( r r r rJ , s zGrid.entryconfigurec C s | � | j�| dd||��S )z+Return True if display item exists at (x,y)rT r( )Z _getbooleanr r r� r r r r7 2 s zGrid.info_existsc C s | j �| dd||�S r. r r� r r r r0 6 s zGrid.info_bboxc C s | j �| dd|||� dS )z�Moves the range of columns from position FROM through TO by
the distance indicated by OFFSET. For example, move_column(2, 4, 1)
moves the columns 2,3,4 to columns 3,4,5.�mover Nr �r r� r� �offsetr r r � move_column: s zGrid.move_columnc C s | j �| dd|||� dS )z�Moves the range of rows from position FROM through TO by
the distance indicated by OFFSET.
For example, move_row(2, 4, 1) moves the rows 2,3,4 to rows 3,4,5.r� r
Nr r� r r r �move_row@ s z
Grid.move_rowc C s | � | j�| d||��S )z8Return coordinate of cell nearest pixel coordinate (x,y)rL r� r� r r r rL F s z Grid.nearestc K s> | � | j|�}|d k r"d|f| }| jj| d||f|�� d S )Nz -itemtyper� )r% r' r r )r rQ rR r� r( �argsr r r r� P s zGrid.setc K s* | j �| j j| jdd|f| �i |��� �S )a� Queries or sets the size of the column given by
INDEX. INDEX may be any non-negative
integer that gives the position of a given column.
INDEX can also be the string "default"; in this case, this command
queries or sets the default size of all columns.
When no option-value pair is given, this command returns a tuple
containing the current size setting of the given column. When
option-value pairs are given, the corresponding options of the
size setting of the given column are changed. Options may be one
of the following:
pad0 pixels
Specifies the paddings to the left of a column.
pad1 pixels
Specifies the paddings to the right of a column.
size val
Specifies the width of a column. Val may be:
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the default master is returned if there is one, otherwise a new
master is created and returned.
If it is not allowed to use the default root and master is None,
RuntimeError is raised.N)�tkinterZ_get_default_root)r& r' r' r( r X s c @ s� e Zd ZdZdZd dd�Zd dd�Zd dd �Zd d
d �Zd d d
�Z dd� Z
dd� Z dd� Z d!dd�Z
dd� Zdd� Zd"dd�ZdS )#r zManipulate style database.z
ttk::styleNc C s0 t |�}t|dd�s t|� || _| jj| _d S )Nr% F)r ru r) r& r# )�selfr& r' r' r( �__init__i s
zStyle.__init__c K s4 |dk rd||< t | j|| jd|�}|s,|r0|S dS )z�Query or sets the default value of the specified option(s) in
style.
Each key in kw is an option and each value is either a string or
a sequence identifying the value for that option.NrQ )rk r# �_name�rw �styleZ query_optrF r_ r' r' r( rQ t s
zStyle.configurec sj |dk r0� j �� jd|d| �}t� j �|��S � j j� jd|ft|��� }� fdd�t� j |��� D �S )aS Query or sets dynamic values of the specified option(s) in
style.
Each key in kw is an option and each value should be a list or a
tuple (usually) containing statespecs grouped in tuples, or list,
or something else of your preference. A statespec is compound of
one or more states and then a value.NrR r0 c s" i | ]\}}|t � j�|���qS r' )ra r# rc )�.0�k�v�rw r' r( �
<dictcomp>� s � z Style.map.<locals>.<dictcomp>)r# rh ry ra rc r@ r r1 rz r' r r( rR � s
�z Style.mapc C s. |rd� |�nd}| j�| jd|d| ||�S )a Returns the value specified for option in style.
If state is specified it is expected to be a sequence of one
or more states. If the default argument is set, it is used as
a fallback value in case no specification for option is found.r9 r8 �lookupr0 )r; r# rh ry )rw r{ �optionr< �defaultr' r' r( r� � s
�z Style.lookupc C s> d}|rt |�d }n |dk r"d}t| j| j�| jd||��S )a� Define the widget layout for given style. If layoutspec is
omitted, return the layout specification for given style.
layoutspec is expected to be a list or an object different than
None that evaluates to False if you want to "turn off" that style.
If it is a list (or tuple, or something else), each item should be
a tuple where the first item is the layout name and the second item
should have the format described below:
LAYOUTS
A layout can contain the value None, if takes no options, or
a dict of options specifying how to arrange the element.
The layout mechanism uses a simplified version of the pack
geometry manager: given an initial cavity, each element is
allocated a parcel. Valid options/values are:
side: whichside
Specifies which side of the cavity to place the
element; one of top, right, bottom or left. If
omitted, the element occupies the entire cavity.
sticky: nswe
Specifies where the element is placed inside its
allocated parcel.
children: [sublayout... ]
Specifies a list of elements to place inside the
element. Each element is a tuple (or other sequence)
where the first item is the layout name, and the other
is a LAYOUT.Nr rS rM )rL re r# rh ry )rw r{ Z
layoutspecZlspecr' r' r( rM � s �z Style.layoutc O s8 t |df|�|�\}}| jj| jdd|||f|�� dS )z9Create a new element in the current theme of given etype.F�element�createN)rI r# rh ry )rw � elementnamerD rE rF rG r4 r' r' r( �element_create� s ��zStyle.element_createc C s( t dd� | j�| j�| jdd��D ��S )z:Returns the list of elements defined in the current theme.c s s | ]}|� d �V qdS �rb N��lstrip)r| �nr' r' r( � <genexpr>� s z&Style.element_names.<locals>.<genexpr>r� �names�r, r# rc rh ry r r' r' r( �
element_names� s �zStyle.element_namesc
C s* t dd� | j�| j�| jdd|��D ��S )z)Return the list of elementname's options.c s s | ]}|� d �V qdS r� r� )r| �or' r' r( r� � s z(Style.element_options.<locals>.<genexpr>r� rj r� )rw r� r' r' r( �element_options� s �zStyle.element_optionsc
C sN |r t |�nd}|r2| j�| jdd|d|d|� n| j�| jdd|d|� dS )a. Creates a new theme.
It is an error if themename already exists. If parent is
specified, the new theme will inherit styles, elements and
layouts from the specified parent theme. If settings are present,
they are expected to have the same syntax used for theme_settings.r8 �themer� z-parentz -settingsN�rY r# rh ry )rw � themename�parentrU r. r' r' r( � theme_create� s � �zStyle.theme_createc C s" t |�}| j�| jdd||� dS )a� Temporarily sets the current theme to themename, apply specified
settings and then restore the previous theme.
Each key in settings is a style and each value may contain the
keys 'configure', 'map', 'layout' and 'element create' and they
are expected to have the same format as specified by the methods
configure, map, layout and element_create respectively.r� rU Nr� )rw r� rU r. r' r' r( �theme_settings� s zStyle.theme_settingsc C s | j �| j �| jdd��S )z#Returns a list of all known themes.r� r� )r# rc rh ry r r' r' r( � theme_names� s zStyle.theme_namesc C s& |dkr| j �d�S | j �d|� dS )z�If themename is None, returns the theme in use, otherwise, set
the current theme to themename, refreshes all widgets and emits
a <<ThemeChanged>> event.Nzreturn $ttk::currentThemez
ttk::setTheme)r# r$ rh )rw r� r' r' r( � theme_use� s zStyle.theme_use)N)N)N)NN)N)NN)N)�__name__�
__module__� __qualname__�__doc__ry rx rQ rR r� rM r� r� r� r� r� r� r� r' r' r' r( r d s
+
c @ s6 e Zd ZdZd dd�Zdd� Zd dd�Zd
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�ZdS )�Widgetz!Base class for Tk themed widgets.Nc C s4 t |�}t|dd�s t|� tjj| |||d� dS )a� Constructs a Ttk Widget with the parent master.
STANDARD OPTIONS
class, cursor, takefocus, style
SCROLLABLE WIDGET OPTIONS
xscrollcommand, yscrollcommand
LABEL WIDGET OPTIONS
text, textvariable, underline, image, compound, width
WIDGET STATES
active, disabled, focus, pressed, selected, background,
readonly, alternate, invalid
r% F)rF N)r ru r) rv r� rx )rw r& Z
widgetnamerF r' r' r( rx s zWidget.__init__c C s | j �| jd||�S )z�Returns the name of the element at position x, y, or the empty
string if the point does not lie within any element.
x and y are pixel coordinates relative to the widget.�identify�r# rh �_w�rw rr �yr' r' r( r� + s zWidget.identifyc O s6 | j �| j �| jdd�|���}|r2|r2|||�S |S )a1 Test the widget's state.
If callback is not specified, returns True if the widget state
matches statespec and False otherwise. If callback is specified,
then it will be invoked with *args, **kw if the widget state
matches statespec. statespec is expected to be a sequence.�instater9 )r# �
getbooleanrh r� r; )rw � statespec�callbackrE rF Zretr' r' r( r� 3 s �
zWidget.instatec C s0 |dk rd� |�}| j�t| j�| jd|���S )a Modify or inquire widget state.
Widget state is returned if statespec is None, otherwise it is
set according to the statespec flags and then a new state spec
is returned indicating which flags were changed. statespec is
expected to be a sequence.Nr9 r< )r; r# rc r[ rh r� )rw r� r' r' r( r< B s
z Widget.state)N)N)N)r� r� r� r� rx r� r� r< r' r' r' r( r�
s
r� c @ s" e Zd ZdZddd�Zdd� ZdS )r zcTtk Button widget, displays a textual label and/or image, and
evaluates a command when pressed.Nc K s t �| |d|� dS )a Construct a Ttk Button widget with the parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, default, width
z ttk::buttonN�r� rx �rw r& rF r' r' r( rx S s zButton.__init__c C s | j �| jd�S )z/Invokes the command associated with the button.�invoker� r r' r' r( r� b s z
Button.invoke)N�r� r� r� r� rx r� r' r' r' r( r O s
c @ s" e Zd ZdZddd�Zdd� ZdS )r z;Ttk Checkbutton widget which is either in on- or off-state.Nc K s t �| |d|� dS )a' Construct a Ttk Checkbutton widget with the parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, offvalue, onvalue, variable
zttk::checkbuttonNr� r� r' r' r( rx j s zCheckbutton.__init__c C s | j �| jd�S )aW Toggles between the selected and deselected states and
invokes the associated command. If the widget is currently
selected, sets the option variable to the offvalue option
and deselects the widget; otherwise, sets the option variable
to the option onvalue.
Returns the result of the associated command.r� r� r r' r' r( r� y s zCheckbutton.invoke)Nr� r' r' r' r( r g s
c @ s2 e Zd ZdZd dd�Zdd� Zdd� Zd d
� ZdS ) r zeTtk Entry widget displays a one-line text string and allows that
string to be edited by the user.Nc K s t �| ||pd|� dS )a� Constructs a Ttk Entry widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus, xscrollcommand
WIDGET-SPECIFIC OPTIONS
exportselection, invalidcommand, justify, show, state,
textvariable, validate, validatecommand, width
VALIDATION MODES
none, key, focus, focusin, focusout, all
z
ttk::entryNr� )rw r& ZwidgetrF r' r' r( rx � s zEntry.__init__c C s | � | j�| jd|��S )zqReturn a tuple of (x, y, width, height) which describes the
bounding box of the character given by index.�bbox�Z_getintsr# rh r� )rw �indexr' r' r( r� � s z
Entry.bboxc C s | j �| jd||�S )zxReturns the name of the element at position x, y, or the
empty string if the coordinates are outside the window.r� r� r� r' r' r( r� � s zEntry.identifyc C s | j �| j �| jd��S )z�Force revalidation, independent of the conditions specified
by the validate option. Returns False if validation fails, True
if it succeeds. Sets or clears the invalid state accordingly.�validate�r# r� rh r� r r' r' r( r� � s zEntry.validate)NN)r� r� r� r� rx r� r� r� r' r' r' r( r � s
c @ s, e Zd ZdZd dd�Zd
dd�Zdd� ZdS ) r zMTtk Combobox widget combines a text field with a pop-down list of
values.Nc K s t j| |df|� dS )a Construct a Ttk Combobox widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
exportselection, justify, height, postcommand, state,
textvariable, values, width
z
ttk::comboboxN�r rx r� r' r' r( rx � s zCombobox.__init__c C s2 |dkr | j �| j �| jd��S | j �| jd|�S )a If newindex is supplied, sets the combobox value to the
element at position newindex in the list of values. Otherwise,
returns the index of the current value in the list of values
or -1 if the current value does not appear in the list.N�current�r# Zgetintrh r� )rw Znewindexr' r' r( r� � s zCombobox.currentc C s | j �| jd|� dS )z(Sets the value of the combobox to value.�setNr� �rw r- r' r' r( r� � s z Combobox.set)N)N)r� r� r� r� rx r� r� r' r' r' r( r � s
c @ s e Zd ZdZddd�ZdS )r zJTtk Frame widget is a container, used to group other widgets
together.Nc K s t �| |d|� dS )z�Construct a Ttk Frame with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
borderwidth, relief, padding, width, height
z
ttk::frameNr� r� r' r' r( rx � s zFrame.__init__)N�r� r� r� r� rx r' r' r' r( r � s c @ s e Zd ZdZddd�ZdS )r z7Ttk Label widget displays a textual label and/or image.Nc K s t �| |d|� dS )aG Construct a Ttk Label with parent master.
STANDARD OPTIONS
class, compound, cursor, image, style, takefocus, text,
textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
anchor, background, font, foreground, justify, padding,
relief, text, wraplength
z
ttk::labelNr� r� r' r' r( rx � s
zLabel.__init__)Nr� r' r' r' r( r � s c @ s e Zd ZdZddd�ZdS )r z�Ttk Labelframe widget is a container used to group other widgets
together. It has an optional label, which may be a plain text string
or another widget.Nc K s t �| |d|� dS )z�Construct a Ttk Labelframe with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
labelanchor, text, underline, padding, labelwidget, width,
height
zttk::labelframeNr� r� r' r' r( rx � s zLabelframe.__init__)Nr� r' r' r' r( r � s c @ s e Zd ZdZddd�ZdS )r zbTtk Menubutton widget displays a textual label and/or image, and
displays a menu when pressed.Nc K s t �| |d|� dS )a Construct a Ttk Menubutton with parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
direction, menu
zttk::menubuttonNr� r� r' r' r( rx s zMenubutton.__init__)Nr� r' r' r' r( r
s c @ sn e Zd ZdZddd�Zdd� Zdd� Zd d
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d� Z dd� Z
ddd�Z ddd�Z dd� Z
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z�Ttk Notebook widget manages a collection of windows and displays
a single one at a time. Each child window is associated with a tab,
which the user may select to change the currently-displayed window.Nc K s t �| |d|� dS )a\ Construct a Ttk Notebook with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
height, padding, width
TAB OPTIONS
state, sticky, padding, text, image, compound, underline
TAB IDENTIFIERS (tab_id)
The tab_id argument found in several methods may take any of
the following forms:
* An integer between zero and the number of tabs
* The name of a child window
* A positional specification of the form "@x,y", which
defines the tab
* The string "current", which identifies the
currently-selected tab
* The string "end", which returns the number of tabs (only
valid for method index)
z
ttk::notebookNr� r� r' r' r( rx " s zNotebook.__init__c K s | j j| jd|ft|��� dS )z�Adds a new tab to the notebook.
If window is currently managed by the notebook but hidden, it is
restored to its previous position.�addN�r# rh r� r6 )rw �childrF r' r' r( r� B s z Notebook.addc C s | j �| jd|� dS )zXRemoves the tab specified by tab_id, unmaps and unmanages the
associated window.�forgetNr� �rw �tab_idr' r' r( r� J s zNotebook.forgetc C s | j �| jd|� dS )z�Hides the tab specified by tab_id.
The tab will not be displayed, but the associated window remains
managed by the notebook and its configuration remembered. Hidden
tabs may be restored with the add command.�hideNr� r� r' r' r( r� P s z
Notebook.hidec C s | j �| jd||�S )zZReturns the name of the tab element at position x, y, or the
empty string if none.r� r� r� r' r' r( r� Y s zNotebook.identifyc C s | j �| j �| jd|��S )z|Returns the numeric index of the tab specified by tab_id, or
the total number of tabs if tab_id is the string "end".r� r� r� r' r' r( r� _ s zNotebook.indexc K s" | j j| jd||ft|��� dS )z�Inserts a pane at the specified position.
pos is either the string end, an integer index, or the name of
a managed child. If child is already managed by the notebook,
moves it to the specified position.�insertNr� �rw �posr� rF r' r' r( r� e s zNotebook.insertc C s | j �| jd|�S )z�Selects the specified tab.
The associated child window will be displayed, and the
previously-selected window (if different) is unmapped. If tab_id
is omitted, returns the widget name of the currently selected
pane.�selectr� r� r' r' r( r� n s zNotebook.selectc K s$ |dk rd||< t | j|| jd|�S )z�Query or modify the options of the specific tab_id.
If kw is not given, returns a dict of the tab option values. If option
is specified, returns the value of that option. Otherwise, sets the
options to the corresponding values.N�tab�rk r# r� )rw r� r� rF r' r' r( r� x s z Notebook.tabc C s | j �| j �| jd�pd�S )z2Returns a list of windows managed by the notebook.�tabsr' �r# rc rh r� r r' r' r( r� � s z
Notebook.tabsc C s | j �d| j� dS )a� Enable keyboard traversal for a toplevel window containing
this notebook.
This will extend the bindings for the toplevel window containing
this notebook as follows:
Control-Tab: selects the tab following the currently selected
one
Shift-Control-Tab: selects the tab preceding the currently
selected one
Alt-K: where K is the mnemonic (underlined) character of any
tab, will select that tab.
Multiple notebooks in a single toplevel may be enabled for
traversal, including nested notebooks. However, notebook traversal
only works properly if all panes are direct children of the
notebook.z ttk::notebook::enableTraversalNr� r r' r' r( �enable_traversal� s zNotebook.enable_traversal)N)N)N)r� r� r� r� rx r� r� r� r� r� r� r� r� r� r� r' r' r' r( r
s
c @ s> e Zd ZdZd dd�ZejjZdd� Zd dd�Z d
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dS )r zfTtk Panedwindow widget displays a number of subwindows, stacked
either vertically or horizontally.Nc K s t �| |d|� dS )z�Construct a Ttk Panedwindow with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
orient, width, height
PANE OPTIONS
weight
zttk::panedwindowNr� r� r' r' r( rx � s zPanedwindow.__init__c K s" | j j| jd||ft|��� dS )z�Inserts a pane at the specified positions.
pos is either the string end, and integer index, or the name
of a child. If child is already managed by the paned window,
moves it to the specified position.r� Nr� r� r' r' r( r� � s zPanedwindow.insertc K s$ |dk rd||< t | j|| jd|�S )aQ Query or modify the options of the specified pane.
pane is either an integer index or the name of a managed subwindow.
If kw is not given, returns a dict of the pane option values. If
option is specified then the value for that option is returned.
Otherwise, sets the options to the corresponding values.N�paner� )rw r� r� rF r' r' r( r� � s zPanedwindow.panec C s | j �| j �| jd||��S )aL If newpos is specified, sets the position of sash number index.
May adjust the positions of adjacent sashes to ensure that
positions are monotonically increasing. Sash positions are further
constrained to be between 0 and the total size of the widget.
Returns the new position of sash number index.�sashposr� )rw r� Znewposr' r' r( r� � s zPanedwindow.sashpos)N)N)N) r� r� r� r� rx rv r r� r� r� r� r' r' r' r( r � s
c @ s6 e Zd ZdZd dd�Zd dd�Zd
dd�Zd d
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a6 Ttk Progressbar widget shows the status of a long-running
operation. They can operate in two modes: determinate mode shows the
amount completed relative to the total amount of work to be done, and
indeterminate mode provides an animated display to let the user know
that something is happening.Nc K s t �| |d|� dS )z�Construct a Ttk Progressbar with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
orient, length, mode, maximum, value, variable, phase
zttk::progressbarNr� r� r' r' r( rx � s zProgressbar.__init__c C s | j �| jd|� dS )z�Begin autoincrement mode: schedules a recurring timer event
that calls method step every interval milliseconds.
interval defaults to 50 milliseconds (20 steps/second) if omitted.�startNr� )rw Zintervalr' r' r( r� � s zProgressbar.startc C s | j �| jd|� dS )zRIncrements the value option by amount.
amount defaults to 1.0 if omitted.�stepNr� )rw Zamountr' r' r( r� � s zProgressbar.stepc C s | j �| jd� dS )zVStop autoincrement mode: cancels any recurring timer event
initiated by start.�stopNr� r r' r' r( r� s zProgressbar.stop)N)N)N)r� r� r� r� rx r� r� r� r' r' r' r( r
� s
c @ s" e Zd ZdZddd�Zdd� ZdS )r zeTtk Radiobutton widgets are used in groups to show or change a
set of mutually-exclusive options.Nc K s t �| |d|� dS )a Construct a Ttk Radiobutton with parent master.
STANDARD OPTIONS
class, compound, cursor, image, state, style, takefocus,
text, textvariable, underline, width
WIDGET-SPECIFIC OPTIONS
command, value, variable
zttk::radiobuttonNr� r� r' r' r( rx s zRadiobutton.__init__c C s | j �| jd�S )z�Sets the option variable to the option value, selects the
widget, and invokes the associated command.
Returns the result of the command, or an empty string if
no command is specified.r� r� r r' r' r( r� s zRadiobutton.invoke)Nr� r' r' r' r( r s
c @ s. e Zd ZdZd dd�Zd
dd�Zd dd�ZdS ) r zTtk Scale widget is typically used to control the numeric value of
a linked variable that varies uniformly over some range.Nc K s t �| |d|� dS )z�Construct a Ttk Scale with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
command, from, length, orient, to, value, variable
z
ttk::scaleNr� r� r' r' r( rx ' s zScale.__init__c K sT t j| |f|�}t|td�tf�s,|�|� td|kd|kd|kg�rP| �d� |S )z�Modify or query scale options.
Setting a value for any of the "from", "from_" or "to" options
generates a <<RangeChanged>> event.NrC �from_�to�<<RangeChanged>>)r� rQ r* �typer[ �update�anyZevent_generate)rw ZcnfrF Zretvalr' r' r( rQ 5 s
zScale.configurec C s | j �| jd||�S )z�Get the current value of the value option, or the value
corresponding to the coordinates x, y if they are specified.
x and y are pixel coordinates relative to the scale widget
origin.r" r� r� r' r' r( r" B s z Scale.get)N)N)NN)r� r� r� r� rx rQ r" r' r' r' r( r # s
c @ s e Zd ZdZddd�ZdS )r z;Ttk Scrollbar controls the viewport of a scrollable widget.Nc K s t �| |d|� dS )z�Construct a Ttk Scrollbar with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
command, orient
zttk::scrollbarNr� r� r' r' r( rx N s zScrollbar.__init__)Nr� r' r' r' r( r K s c @ s e Zd ZdZddd�ZdS )r zITtk Separator widget displays a horizontal or vertical separator
bar.Nc K s t �| |d|� dS )z�Construct a Ttk Separator with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus
WIDGET-SPECIFIC OPTIONS
orient
zttk::separatorNr� r� r' r' r( rx ` s zSeparator.__init__)Nr� r' r' r' r( r \ s c @ s e Zd ZdZddd�ZdS )r zlTtk Sizegrip allows the user to resize the containing toplevel
window by pressing and dragging the grip.Nc K s t �| |d|� dS )z�Construct a Ttk Sizegrip with parent master.
STANDARD OPTIONS
class, cursor, state, style, takefocus
z
ttk::sizegripNr� r� r' r' r( rx r s zSizegrip.__init__)Nr� r' r' r' r( r n s c @ s" e Zd ZdZddd�Zdd� ZdS )r z�Ttk Spinbox is an Entry with increment and decrement arrows
It is commonly used for number entry or to select from a list of
string values.
Nc K s t j| |df|� dS )a/ Construct a Ttk Spinbox widget with the parent master.
STANDARD OPTIONS
class, cursor, style, takefocus, validate,
validatecommand, xscrollcommand, invalidcommand
WIDGET-SPECIFIC OPTIONS
to, from_, increment, values, wrap, format, command
z ttk::spinboxNr� r� r' r' r( rx � s zSpinbox.__init__c C s | j �| jd|� dS )z'Sets the value of the Spinbox to value.r� Nr� r� r' r' r( r� � s z Spinbox.set)N)r� r� r� r� rx r� r' r' r' r( r | s
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dd� Zdd� Zdd � Zd d � Zd d � Zd!d"� ZdKd#d$�ZdLd%d&�Zd'd(� ZeZd)d*� Zd+d,� Zd-d.� Zd/d0� Zd1d2� Z d3d4� Z d5d6� Z d7d8� Z d9d:� Z d;d<� Z!dMd=d>�Z"dNd?d@�Z#dOdAdB�Z$dPdCdD�Z%dS )Qr z�Ttk Treeview widget displays a hierarchical collection of items.
Each item has a textual label, an optional image, and an optional list
of data values. The data values are displayed in successive columns
after the tree label.Nc K s t �| |d|� dS )a� Construct a Ttk Treeview with parent master.
STANDARD OPTIONS
class, cursor, style, takefocus, xscrollcommand,
yscrollcommand
WIDGET-SPECIFIC OPTIONS
columns, displaycolumns, height, padding, selectmode, show
ITEM OPTIONS
text, image, values, open, tags
TAG OPTIONS
foreground, background, font, image
z
ttk::treeviewNr� r� r' r' r( rx � s zTreeview.__init__c C s | � | j�| jd||��p dS )aT Returns the bounding box (relative to the treeview widget's
window) of the specified item in the form x y width height.
If column is specified, returns the bounding box of that cell.
If the item is not visible (i.e., if it is a descendant of a
closed item or is scrolled offscreen), returns an empty string.r� r8 r� )rw �item�columnr' r' r( r� � s z
Treeview.bboxc C s" | j �| j �| jd|pd�p d�S )zhReturns a tuple of children belonging to item.
If item is not specified, returns root children.rJ r8 r' r� �rw r� r' r' r( � get_children� s �zTreeview.get_childrenc G s | j �| jd||� dS )z�Replaces item's child with newchildren.
Children present in item that are not present in newchildren
are detached from tree. No items in newchildren may be an
ancestor of item.rJ Nr� )rw r� Z newchildrenr' r' r( � set_children� s zTreeview.set_childrenc K s$ |dk rd||< t | j|| jd|�S )a
Query or modify the options for the specified column.
If kw is not given, returns a dict of the column option values. If
option is specified then the value for that option is returned.
Otherwise, sets the options to the corresponding values.Nr� r� )rw r� r� rF r' r' r( r� � s zTreeview.columnc G s | j �| jd|� dS )z_Delete all specified items and all their descendants. The root
item may not be deleted.�deleteNr� �rw r1 r' r' r( r� � s zTreeview.deletec G s | j �| jd|� dS )z�Unlinks all of the specified items from the tree.
The items and all of their descendants are still present, and may
be reinserted at another point in the tree, but will not be
displayed. The root item may not be detached.�detachNr� r� r' r' r( r� � s zTreeview.detachc C s | j �| j �| jd|��S )zSReturns True if the specified item is present in the tree,
False otherwise.�existsr� r� r' r' r( r� � s zTreeview.existsc C s | j �| jd|�S )z}If item is specified, sets the focus item to item. Otherwise,
returns the current focus item, or '' if there is none.�focusr� r� r' r' r( r� � s zTreeview.focusc K sP |� d�}|r,t|t�s,| j�|| j�|d< |dk r<d||< t| j|| jd|�S )a_ Query or modify the heading options for the specified column.
If kw is not given, returns a dict of the heading option values. If
option is specified then the value for that option is returned.
Otherwise, sets the options to the corresponding values.
Valid options/values are:
text: text
The text to display in the column heading
image: image_name
Specifies an image to display to the right of the column
heading
anchor: anchor
Specifies how the heading text should be aligned. One of
the standard Tk anchor values
command: callback
A callback to be invoked when the heading label is
pressed.
To configure the tree column heading, call this with column = "#0" �commandN�heading) r" r* r[ r& �registerZ _substituterk r# r� )rw r� r� rF �cmdr' r' r( r� � s
zTreeview.headingc C s | j �| jd|||�S )z�Returns a description of the specified component under the
point given by x and y, or the empty string if no such component
is present at that position.r� r� )rw Z componentrr r� r' r' r( r� s zTreeview.identifyc C s | � dd|�S )z.Returns the item ID of the item at position y.�rowr �r� )rw r� r' r' r( � identify_row s zTreeview.identify_rowc C s | � d|d�S )zaReturns the data column identifier of the cell at position x.
The tree column has ID #0.r� r r� )rw rr r' r' r( �identify_column" s zTreeview.identify_columnc C s | � d||�S )z�Returns one of:
heading: Tree heading area.
separator: Space between two columns headings;
tree: The tree area.
cell: A data cell.
* Availability: Tk 8.6Zregionr� r� r' r' r( �identify_region) s zTreeview.identify_regionc C s | � d||�S )zEReturns the element at position x, y.
* Availability: Tk 8.6r� r� r� r' r' r( �identify_element5 s zTreeview.identify_elementc C s | j �| j �| jd|��S )zOReturns the integer index of item within its parent's list
of children.r� r� r� r' r' r( r� < s zTreeview.indexc K sN t |�}|dk r0| jj| jd||d|f|�� }n| jj| jd||f|�� }|S )a� Creates a new item and return the item identifier of the newly
created item.
parent is the item ID of the parent item, or the empty string
to create a new top-level item. index is an integer, or the value
end, specifying where in the list of parent's children to insert
the new item. If index is less than or equal to zero, the new node
is inserted at the beginning, if index is greater than or equal to
the current number of children, it is inserted at the end. If iid
is specified, it is used as the item identifier, iid must not
already exist in the tree. Otherwise, a new unique identifier
is generated.Nr� z-id)r6 r# rh r� )rw r� r� ZiidrF r4 rf r' r' r( r� B s
��zTreeview.insertc K s$ |dk rd||< t | j|| jd|�S )a- Query or modify the options for the specified item.
If no options are given, a dict with options/values for the item
is returned. If option is specified then the value for that option
is returned. Otherwise, sets the options to the corresponding
values as given by kw.Nr� r� )rw r� r� rF r' r' r( r� Y s z
Treeview.itemc C s | j �| jd|||� dS )aR Moves item to position index in parent's list of children.
It is illegal to move an item under one of its descendants. If
index is less than or equal to zero, item is moved to the
beginning, if greater than or equal to the number of children,
it is moved to the end. If item was detached it is reattached.�moveNr� )rw r� r� r� r' r' r( r� e s z
Treeview.movec C s | j �| jd|�S )zeReturns the identifier of item's next sibling, or '' if item
is the last child of its parent.�nextr� r� r' r' r( r� q s z
Treeview.nextc C s | j �| jd|�S )zaReturns the ID of the parent of item, or '' if item is at the
top level of the hierarchy.r� r� r� r' r' r( r� w s zTreeview.parentc C s | j �| jd|�S )zjReturns the identifier of item's previous sibling, or '' if
item is the first child of its parent.�prevr� r� r' r' r( r� } s z
Treeview.prevc C s | j �| jd|� dS )z�Ensure that item is visible.
Sets all of item's ancestors open option to True, and scrolls
the widget if necessary so that item is within the visible
portion of the tree.�seeNr� r� r' r' r( r� � s z Treeview.seec C s | j �| j �| jd��S )z$Returns the tuple of selected items.� selectionr� r r' r' r( r� � s zTreeview.selectionc C s> t |�dkr&t|d ttf�r&|d }| j�| jd||� d S )Nr7 r r� )r: r* r, r+ r# rh r� )rw Zselopr1 r' r' r( �
_selection� s zTreeview._selectionc G s | � d|� dS )z.The specified items becomes the new selection.r� N�r� r� r' r' r( �
selection_set� s zTreeview.selection_setc G s | � d|� dS )z0Add all of the specified items to the selection.r� Nr� r� r' r' r( �
selection_add� s zTreeview.selection_addc G s | � d|� dS )z5Remove all of the specified items from the selection.�removeNr� r� r' r' r( �selection_remove� s zTreeview.selection_removec G s | � d|� dS )z2Toggle the selection state of each specified item.ZtoggleNr� r� r' r' r( �selection_toggle� s zTreeview.selection_togglec C s@ | j �| jd|||�}|dkr8|dkr8t| j |dtd�S |S dS )a; Query or set the value of given item.
With one argument, return a dictionary of column/value pairs
for the specified item. With two arguments, return the current
value of the specified column. With three arguments, set the
value of given column in given item to the specified value.r� NF)Z cut_minusrg )r# rh r� r ri )rw r� r� r- rf r' r' r( r� � s �z Treeview.setc C s | j | jdd|f||dd� dS )z�Bind a callback for the given event sequence to the tag tagname.
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of the item's tags option are called.�tag�bindr )r� N)Z_bindr� )rw �tagnameZsequencer� r' r' r( �tag_bind� s zTreeview.tag_bindc K s& |dk rd||< t | j|| jdd|�S )aB Query or modify the options for the specified tagname.
If kw is not given, returns a dict of the option settings for tagname.
If option is specified, returns the value for that option for the
specified tagname. Otherwise, sets the options to the corresponding
values for the given tagname.Nr� rQ r� )rw r� r� rF r' r' r( �
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�zTreeview.tag_configurec C sF |dkr$| j �| j �| jdd|��S | j �| j �| jdd||��S dS )z�If item is specified, returns 1 or 0 depending on whether the
specified item has the given tagname. Otherwise, returns a list of
all items which have the specified tag.
* Availability: Tk 8.6Nr� Zhas)r# rc rh r� r� )rw r� r� r' r' r( �tag_has� s ��zTreeview.tag_has)N)N)N)N)N)N)N)N)NN)NN)N)N)&r� r� r� r� rx r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� r� Zreattachr� r� r� r� r� r� r� r� r� r� r� r� r� r� r' r' r' r( r � sF
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WIDGET-SPECIFIC OPTIONS
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Menubutton style.
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krTe� dS )aF Drag-and-drop support for Tkinter.
This is very preliminary. I currently only support dnd *within* one
application, between different windows (or within the same window).
I am trying to make this as generic as possible -- not dependent on
the use of a particular widget or icon type, etc. I also hope that
this will work with Pmw.
To enable an object to be dragged, you must create an event binding
for it that starts the drag-and-drop process. Typically, you should
bind <ButtonPress> to a callback function that you write. The function
should call Tkdnd.dnd_start(source, event), where 'source' is the
object to be dragged, and 'event' is the event that invoked the call
(the argument to your callback function). Even though this is a class
instantiation, the returned instance should not be stored -- it will
be kept alive automatically for the duration of the drag-and-drop.
When a drag-and-drop is already in process for the Tk interpreter, the
call is *ignored*; this normally averts starting multiple simultaneous
dnd processes, e.g. because different button callbacks all
dnd_start().
The object is *not* necessarily a widget -- it can be any
application-specific object that is meaningful to potential
drag-and-drop targets.
Potential drag-and-drop targets are discovered as follows. Whenever
the mouse moves, and at the start and end of a drag-and-drop move, the
Tk widget directly under the mouse is inspected. This is the target
widget (not to be confused with the target object, yet to be
determined). If there is no target widget, there is no dnd target
object. If there is a target widget, and it has an attribute
dnd_accept, this should be a function (or any callable object). The
function is called as dnd_accept(source, event), where 'source' is the
object being dragged (the object passed to dnd_start() above), and
'event' is the most recent event object (generally a <Motion> event;
it can also be <ButtonPress> or <ButtonRelease>). If the dnd_accept()
function returns something other than None, this is the new dnd target
object. If dnd_accept() returns None, or if the target widget has no
dnd_accept attribute, the target widget's parent is considered as the
target widget, and the search for a target object is repeated from
there. If necessary, the search is repeated all the way up to the
root widget. If none of the target widgets can produce a target
object, there is no target object (the target object is None).
The target object thus produced, if any, is called the new target
object. It is compared with the old target object (or None, if there
was no old target widget). There are several cases ('source' is the
source object, and 'event' is the most recent event object):
- Both the old and new target objects are None. Nothing happens.
- The old and new target objects are the same object. Its method
dnd_motion(source, event) is called.
- The old target object was None, and the new target object is not
None. The new target object's method dnd_enter(source, event) is
called.
- The new target object is None, and the old target object is not
None. The old target object's method dnd_leave(source, event) is
called.
- The old and new target objects differ and neither is None. The old
target object's method dnd_leave(source, event), and then the new
target object's method dnd_enter(source, event) is called.
Once this is done, the new target object replaces the old one, and the
Tk mainloop proceeds. The return value of the methods mentioned above
is ignored; if they raise an exception, the normal exception handling
mechanisms take over.
The drag-and-drop processes can end in two ways: a final target object
is selected, or no final target object is selected. When a final
target object is selected, it will always have been notified of the
potential drop by a call to its dnd_enter() method, as described
above, and possibly one or more calls to its dnd_motion() method; its
dnd_leave() method has not been called since the last call to
dnd_enter(). The target is notified of the drop by a call to its
method dnd_commit(source, event).
If no final target object is selected, and there was an old target
object, its dnd_leave(source, event) method is called to complete the
dnd sequence.
Finally, the source object is notified that the drag-and-drop process
is over, by a call to source.dnd_end(target, event), specifying either
the selected target object, or None if no target object was selected.
The source object can use this to implement the commit action; this is
sometimes simpler than to do it in the target's dnd_commit(). The
target's dnd_commit() method could then simply be aliased to
dnd_leave().
At any time during a dnd sequence, the application can cancel the
sequence by calling the cancel() method on the object returned by
dnd_start(). This will call dnd_leave() if a target is currently
active; it will never call dnd_commit().
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1 ) �reZjsonr Z_jsonr Z c_scanstring� ImportError�__all__�VERBOSE� MULTILINE�DOTALL�FLAGSr] r ZPosInfZNegInfr r r^ �compileZ STRINGCHUNKZ BACKSLASHr0 re rC rd ZWHITESPACE_STRrV rY �objectr r r r r �<module> s4
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� P @ s� d ddddddddd d
d d d
ddddddddddddddd d d d d d!d"d#d$d%d&d'd(d d)d*d+d,d-d.d/d0d1d2d3d4d5d6d7d8d9d:d;d<d=d>d?d@dAdBdCdDdEdFdGdHdIdJdKdLdMdN�OZ dOS )Pau The "assert" statement
**********************
Assert statements are a convenient way to insert debugging assertions
into a program:
assert_stmt ::= "assert" expression ["," expression]
The simple form, "assert expression", is equivalent to
if __debug__:
if not expression: raise AssertionError
The extended form, "assert expression1, expression2", is equivalent to
if __debug__:
if not expression1: raise AssertionError(expression2)
These equivalences assume that "__debug__" and "AssertionError" refer
to the built-in variables with those names. In the current
implementation, the built-in variable "__debug__" is "True" under
normal circumstances, "False" when optimization is requested (command
line option "-O"). The current code generator emits no code for an
assert statement when optimization is requested at compile time. Note
that it is unnecessary to include the source code for the expression
that failed in the error message; it will be displayed as part of the
stack trace.
Assignments to "__debug__" are illegal. The value for the built-in
variable is determined when the interpreter starts.
u�, Assignment statements
*********************
Assignment statements are used to (re)bind names to values and to
modify attributes or items of mutable objects:
assignment_stmt ::= (target_list "=")+ (starred_expression | yield_expression)
target_list ::= target ("," target)* [","]
target ::= identifier
| "(" [target_list] ")"
| "[" [target_list] "]"
| attributeref
| subscription
| slicing
| "*" target
(See section Primaries for the syntax definitions for *attributeref*,
*subscription*, and *slicing*.)
An assignment statement evaluates the expression list (remember that
this can be a single expression or a comma-separated list, the latter
yielding a tuple) and assigns the single resulting object to each of
the target lists, from left to right.
Assignment is defined recursively depending on the form of the target
(list). When a target is part of a mutable object (an attribute
reference, subscription or slicing), the mutable object must
ultimately perform the assignment and decide about its validity, and
may raise an exception if the assignment is unacceptable. The rules
observed by various types and the exceptions raised are given with the
definition of the object types (see section The standard type
hierarchy).
Assignment of an object to a target list, optionally enclosed in
parentheses or square brackets, is recursively defined as follows.
* If the target list is a single target with no trailing comma,
optionally in parentheses, the object is assigned to that target.
* Else: The object must be an iterable with the same number of items
as there are targets in the target list, and the items are assigned,
from left to right, to the corresponding targets.
* If the target list contains one target prefixed with an asterisk,
called a “starred” target: The object must be an iterable with at
least as many items as there are targets in the target list, minus
one. The first items of the iterable are assigned, from left to
right, to the targets before the starred target. The final items
of the iterable are assigned to the targets after the starred
target. A list of the remaining items in the iterable is then
assigned to the starred target (the list can be empty).
* Else: The object must be an iterable with the same number of items
as there are targets in the target list, and the items are
assigned, from left to right, to the corresponding targets.
Assignment of an object to a single target is recursively defined as
follows.
* If the target is an identifier (name):
* If the name does not occur in a "global" or "nonlocal" statement
in the current code block: the name is bound to the object in the
current local namespace.
* Otherwise: the name is bound to the object in the global namespace
or the outer namespace determined by "nonlocal", respectively.
The name is rebound if it was already bound. This may cause the
reference count for the object previously bound to the name to reach
zero, causing the object to be deallocated and its destructor (if it
has one) to be called.
* If the target is an attribute reference: The primary expression in
the reference is evaluated. It should yield an object with
assignable attributes; if this is not the case, "TypeError" is
raised. That object is then asked to assign the assigned object to
the given attribute; if it cannot perform the assignment, it raises
an exception (usually but not necessarily "AttributeError").
Note: If the object is a class instance and the attribute reference
occurs on both sides of the assignment operator, the right-hand side
expression, "a.x" can access either an instance attribute or (if no
instance attribute exists) a class attribute. The left-hand side
target "a.x" is always set as an instance attribute, creating it if
necessary. Thus, the two occurrences of "a.x" do not necessarily
refer to the same attribute: if the right-hand side expression
refers to a class attribute, the left-hand side creates a new
instance attribute as the target of the assignment:
class Cls:
x = 3 # class variable
inst = Cls()
inst.x = inst.x + 1 # writes inst.x as 4 leaving Cls.x as 3
This description does not necessarily apply to descriptor
attributes, such as properties created with "property()".
* If the target is a subscription: The primary expression in the
reference is evaluated. It should yield either a mutable sequence
object (such as a list) or a mapping object (such as a dictionary).
Next, the subscript expression is evaluated.
If the primary is a mutable sequence object (such as a list), the
subscript must yield an integer. If it is negative, the sequence’s
length is added to it. The resulting value must be a nonnegative
integer less than the sequence’s length, and the sequence is asked
to assign the assigned object to its item with that index. If the
index is out of range, "IndexError" is raised (assignment to a
subscripted sequence cannot add new items to a list).
If the primary is a mapping object (such as a dictionary), the
subscript must have a type compatible with the mapping’s key type,
and the mapping is then asked to create a key/datum pair which maps
the subscript to the assigned object. This can either replace an
existing key/value pair with the same key value, or insert a new
key/value pair (if no key with the same value existed).
For user-defined objects, the "__setitem__()" method is called with
appropriate arguments.
* If the target is a slicing: The primary expression in the reference
is evaluated. It should yield a mutable sequence object (such as a
list). The assigned object should be a sequence object of the same
type. Next, the lower and upper bound expressions are evaluated,
insofar they are present; defaults are zero and the sequence’s
length. The bounds should evaluate to integers. If either bound is
negative, the sequence’s length is added to it. The resulting
bounds are clipped to lie between zero and the sequence’s length,
inclusive. Finally, the sequence object is asked to replace the
slice with the items of the assigned sequence. The length of the
slice may be different from the length of the assigned sequence,
thus changing the length of the target sequence, if the target
sequence allows it.
**CPython implementation detail:** In the current implementation, the
syntax for targets is taken to be the same as for expressions, and
invalid syntax is rejected during the code generation phase, causing
less detailed error messages.
Although the definition of assignment implies that overlaps between
the left-hand side and the right-hand side are ‘simultaneous’ (for
example "a, b = b, a" swaps two variables), overlaps *within* the
collection of assigned-to variables occur left-to-right, sometimes
resulting in confusion. For instance, the following program prints
"[0, 2]":
x = [0, 1]
i = 0
i, x[i] = 1, 2 # i is updated, then x[i] is updated
print(x)
See also:
**PEP 3132** - Extended Iterable Unpacking
The specification for the "*target" feature.
Augmented assignment statements
===============================
Augmented assignment is the combination, in a single statement, of a
binary operation and an assignment statement:
augmented_assignment_stmt ::= augtarget augop (expression_list | yield_expression)
augtarget ::= identifier | attributeref | subscription | slicing
augop ::= "+=" | "-=" | "*=" | "@=" | "/=" | "//=" | "%=" | "**="
| ">>=" | "<<=" | "&=" | "^=" | "|="
(See section Primaries for the syntax definitions of the last three
symbols.)
An augmented assignment evaluates the target (which, unlike normal
assignment statements, cannot be an unpacking) and the expression
list, performs the binary operation specific to the type of assignment
on the two operands, and assigns the result to the original target.
The target is only evaluated once.
An augmented assignment expression like "x += 1" can be rewritten as
"x = x + 1" to achieve a similar, but not exactly equal effect. In the
augmented version, "x" is only evaluated once. Also, when possible,
the actual operation is performed *in-place*, meaning that rather than
creating a new object and assigning that to the target, the old object
is modified instead.
Unlike normal assignments, augmented assignments evaluate the left-
hand side *before* evaluating the right-hand side. For example, "a[i]
+= f(x)" first looks-up "a[i]", then it evaluates "f(x)" and performs
the addition, and lastly, it writes the result back to "a[i]".
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments. Similarly,
with the exception of the possible *in-place* behavior, the binary
operation performed by augmented assignment is the same as the normal
binary operations.
For targets which are attribute references, the same caveat about
class and instance attributes applies as for regular assignments.
Annotated assignment statements
===============================
*Annotation* assignment is the combination, in a single statement, of
a variable or attribute annotation and an optional assignment
statement:
annotated_assignment_stmt ::= augtarget ":" expression
["=" (starred_expression | yield_expression)]
The difference from normal Assignment statements is that only single
target is allowed.
For simple names as assignment targets, if in class or module scope,
the annotations are evaluated and stored in a special class or module
attribute "__annotations__" that is a dictionary mapping from variable
names (mangled if private) to evaluated annotations. This attribute is
writable and is automatically created at the start of class or module
body execution, if annotations are found statically.
For expressions as assignment targets, the annotations are evaluated
if in class or module scope, but not stored.
If a name is annotated in a function scope, then this name is local
for that scope. Annotations are never evaluated and stored in function
scopes.
If the right hand side is present, an annotated assignment performs
the actual assignment before evaluating annotations (where
applicable). If the right hand side is not present for an expression
target, then the interpreter evaluates the target except for the last
"__setitem__()" or "__setattr__()" call.
See also:
**PEP 526** - Syntax for Variable Annotations
The proposal that added syntax for annotating the types of
variables (including class variables and instance variables),
instead of expressing them through comments.
**PEP 484** - Type hints
The proposal that added the "typing" module to provide a standard
syntax for type annotations that can be used in static analysis
tools and IDEs.
Changed in version 3.8: Now annotated assignments allow same
expressions in the right hand side as the regular assignments.
Previously, some expressions (like un-parenthesized tuple expressions)
caused a syntax error.
u>
Coroutines
**********
New in version 3.5.
Coroutine function definition
=============================
async_funcdef ::= [decorators] "async" "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
Execution of Python coroutines can be suspended and resumed at many
points (see *coroutine*). Inside the body of a coroutine function,
"await" and "async" identifiers become reserved keywords; "await"
expressions, "async for" and "async with" can only be used in
coroutine function bodies.
Functions defined with "async def" syntax are always coroutine
functions, even if they do not contain "await" or "async" keywords.
It is a "SyntaxError" to use a "yield from" expression inside the body
of a coroutine function.
An example of a coroutine function:
async def func(param1, param2):
do_stuff()
await some_coroutine()
The "async for" statement
=========================
async_for_stmt ::= "async" for_stmt
An *asynchronous iterable* is able to call asynchronous code in its
*iter* implementation, and *asynchronous iterator* can call
asynchronous code in its *next* method.
The "async for" statement allows convenient iteration over
asynchronous iterators.
The following code:
async for TARGET in ITER:
SUITE
else:
SUITE2
Is semantically equivalent to:
iter = (ITER)
iter = type(iter).__aiter__(iter)
running = True
while running:
try:
TARGET = await type(iter).__anext__(iter)
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2
See also "__aiter__()" and "__anext__()" for details.
It is a "SyntaxError" to use an "async for" statement outside the body
of a coroutine function.
The "async with" statement
==========================
async_with_stmt ::= "async" with_stmt
An *asynchronous context manager* is a *context manager* that is able
to suspend execution in its *enter* and *exit* methods.
The following code:
async with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
aexit = type(manager).__aexit__
aenter = type(manager).__aenter__
value = await aenter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
See also "__aenter__()" and "__aexit__()" for details.
It is a "SyntaxError" to use an "async with" statement outside the
body of a coroutine function.
See also:
**PEP 492** - Coroutines with async and await syntax
The proposal that made coroutines a proper standalone concept in
Python, and added supporting syntax.
-[ Footnotes ]-
[1] The exception is propagated to the invocation stack unless there
is a "finally" clause which happens to raise another exception.
That new exception causes the old one to be lost.
[2] A string literal appearing as the first statement in the function
body is transformed into the function’s "__doc__" attribute and
therefore the function’s *docstring*.
[3] A string literal appearing as the first statement in the class
body is transformed into the namespace’s "__doc__" item and
therefore the class’s *docstring*.
a� Identifiers (Names)
*******************
An identifier occurring as an atom is a name. See section Identifiers
and keywords for lexical definition and section Naming and binding for
documentation of naming and binding.
When the name is bound to an object, evaluation of the atom yields
that object. When a name is not bound, an attempt to evaluate it
raises a "NameError" exception.
**Private name mangling:** When an identifier that textually occurs in
a class definition begins with two or more underscore characters and
does not end in two or more underscores, it is considered a *private
name* of that class. Private names are transformed to a longer form
before code is generated for them. The transformation inserts the
class name, with leading underscores removed and a single underscore
inserted, in front of the name. For example, the identifier "__spam"
occurring in a class named "Ham" will be transformed to "_Ham__spam".
This transformation is independent of the syntactical context in which
the identifier is used. If the transformed name is extremely long
(longer than 255 characters), implementation defined truncation may
happen. If the class name consists only of underscores, no
transformation is done.
u
Literals
********
Python supports string and bytes literals and various numeric
literals:
literal ::= stringliteral | bytesliteral
| integer | floatnumber | imagnumber
Evaluation of a literal yields an object of the given type (string,
bytes, integer, floating point number, complex number) with the given
value. The value may be approximated in the case of floating point
and imaginary (complex) literals. See section Literals for details.
All literals correspond to immutable data types, and hence the
object’s identity is less important than its value. Multiple
evaluations of literals with the same value (either the same
occurrence in the program text or a different occurrence) may obtain
the same object or a different object with the same value.
uA7 Customizing attribute access
****************************
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of "x.name") for
class instances.
object.__getattr__(self, name)
Called when the default attribute access fails with an
"AttributeError" (either "__getattribute__()" raises an
"AttributeError" because *name* is not an instance attribute or an
attribute in the class tree for "self"; or "__get__()" of a *name*
property raises "AttributeError"). This method should either
return the (computed) attribute value or raise an "AttributeError"
exception.
Note that if the attribute is found through the normal mechanism,
"__getattr__()" is not called. (This is an intentional asymmetry
between "__getattr__()" and "__setattr__()".) This is done both for
efficiency reasons and because otherwise "__getattr__()" would have
no way to access other attributes of the instance. Note that at
least for instance variables, you can fake total control by not
inserting any values in the instance attribute dictionary (but
instead inserting them in another object). See the
"__getattribute__()" method below for a way to actually get total
control over attribute access.
object.__getattribute__(self, name)
Called unconditionally to implement attribute accesses for
instances of the class. If the class also defines "__getattr__()",
the latter will not be called unless "__getattribute__()" either
calls it explicitly or raises an "AttributeError". This method
should return the (computed) attribute value or raise an
"AttributeError" exception. In order to avoid infinite recursion in
this method, its implementation should always call the base class
method with the same name to access any attributes it needs, for
example, "object.__getattribute__(self, name)".
Note:
This method may still be bypassed when looking up special methods
as the result of implicit invocation via language syntax or
built-in functions. See Special method lookup.
For certain sensitive attribute accesses, raises an auditing event
"object.__getattr__" with arguments "obj" and "name".
object.__setattr__(self, name, value)
Called when an attribute assignment is attempted. This is called
instead of the normal mechanism (i.e. store the value in the
instance dictionary). *name* is the attribute name, *value* is the
value to be assigned to it.
If "__setattr__()" wants to assign to an instance attribute, it
should call the base class method with the same name, for example,
"object.__setattr__(self, name, value)".
For certain sensitive attribute assignments, raises an auditing
event "object.__setattr__" with arguments "obj", "name", "value".
object.__delattr__(self, name)
Like "__setattr__()" but for attribute deletion instead of
assignment. This should only be implemented if "del obj.name" is
meaningful for the object.
For certain sensitive attribute deletions, raises an auditing event
"object.__delattr__" with arguments "obj" and "name".
object.__dir__(self)
Called when "dir()" is called on the object. A sequence must be
returned. "dir()" converts the returned sequence to a list and
sorts it.
Customizing module attribute access
===================================
Special names "__getattr__" and "__dir__" can be also used to
customize access to module attributes. The "__getattr__" function at
the module level should accept one argument which is the name of an
attribute and return the computed value or raise an "AttributeError".
If an attribute is not found on a module object through the normal
lookup, i.e. "object.__getattribute__()", then "__getattr__" is
searched in the module "__dict__" before raising an "AttributeError".
If found, it is called with the attribute name and the result is
returned.
The "__dir__" function should accept no arguments, and return a
sequence of strings that represents the names accessible on module. If
present, this function overrides the standard "dir()" search on a
module.
For a more fine grained customization of the module behavior (setting
attributes, properties, etc.), one can set the "__class__" attribute
of a module object to a subclass of "types.ModuleType". For example:
import sys
from types import ModuleType
class VerboseModule(ModuleType):
def __repr__(self):
return f'Verbose {self.__name__}'
def __setattr__(self, attr, value):
print(f'Setting {attr}...')
super().__setattr__(attr, value)
sys.modules[__name__].__class__ = VerboseModule
Note:
Defining module "__getattr__" and setting module "__class__" only
affect lookups made using the attribute access syntax – directly
accessing the module globals (whether by code within the module, or
via a reference to the module’s globals dictionary) is unaffected.
Changed in version 3.5: "__class__" module attribute is now writable.
New in version 3.7: "__getattr__" and "__dir__" module attributes.
See also:
**PEP 562** - Module __getattr__ and __dir__
Describes the "__getattr__" and "__dir__" functions on modules.
Implementing Descriptors
========================
The following methods only apply when an instance of the class
containing the method (a so-called *descriptor* class) appears in an
*owner* class (the descriptor must be in either the owner’s class
dictionary or in the class dictionary for one of its parents). In the
examples below, “the attribute” refers to the attribute whose name is
the key of the property in the owner class’ "__dict__".
object.__get__(self, instance, owner=None)
Called to get the attribute of the owner class (class attribute
access) or of an instance of that class (instance attribute
access). The optional *owner* argument is the owner class, while
*instance* is the instance that the attribute was accessed through,
or "None" when the attribute is accessed through the *owner*.
This method should return the computed attribute value or raise an
"AttributeError" exception.
**PEP 252** specifies that "__get__()" is callable with one or two
arguments. Python’s own built-in descriptors support this
specification; however, it is likely that some third-party tools
have descriptors that require both arguments. Python’s own
"__getattribute__()" implementation always passes in both arguments
whether they are required or not.
object.__set__(self, instance, value)
Called to set the attribute on an instance *instance* of the owner
class to a new value, *value*.
Note, adding "__set__()" or "__delete__()" changes the kind of
descriptor to a “data descriptor”. See Invoking Descriptors for
more details.
object.__delete__(self, instance)
Called to delete the attribute on an instance *instance* of the
owner class.
object.__set_name__(self, owner, name)
Called at the time the owning class *owner* is created. The
descriptor has been assigned to *name*.
Note:
"__set_name__()" is only called implicitly as part of the "type"
constructor, so it will need to be called explicitly with the
appropriate parameters when a descriptor is added to a class
after initial creation:
class A:
pass
descr = custom_descriptor()
A.attr = descr
descr.__set_name__(A, 'attr')
See Creating the class object for more details.
New in version 3.6.
The attribute "__objclass__" is interpreted by the "inspect" module as
specifying the class where this object was defined (setting this
appropriately can assist in runtime introspection of dynamic class
attributes). For callables, it may indicate that an instance of the
given type (or a subclass) is expected or required as the first
positional argument (for example, CPython sets this attribute for
unbound methods that are implemented in C).
Invoking Descriptors
====================
In general, a descriptor is an object attribute with “binding
behavior”, one whose attribute access has been overridden by methods
in the descriptor protocol: "__get__()", "__set__()", and
"__delete__()". If any of those methods are defined for an object, it
is said to be a descriptor.
The default behavior for attribute access is to get, set, or delete
the attribute from an object’s dictionary. For instance, "a.x" has a
lookup chain starting with "a.__dict__['x']", then
"type(a).__dict__['x']", and continuing through the base classes of
"type(a)" excluding metaclasses.
However, if the looked-up value is an object defining one of the
descriptor methods, then Python may override the default behavior and
invoke the descriptor method instead. Where this occurs in the
precedence chain depends on which descriptor methods were defined and
how they were called.
The starting point for descriptor invocation is a binding, "a.x". How
the arguments are assembled depends on "a":
Direct Call
The simplest and least common call is when user code directly
invokes a descriptor method: "x.__get__(a)".
Instance Binding
If binding to an object instance, "a.x" is transformed into the
call: "type(a).__dict__['x'].__get__(a, type(a))".
Class Binding
If binding to a class, "A.x" is transformed into the call:
"A.__dict__['x'].__get__(None, A)".
Super Binding
If "a" is an instance of "super", then the binding "super(B,
obj).m()" searches "obj.__class__.__mro__" for the base class "A"
immediately preceding "B" and then invokes the descriptor with the
call: "A.__dict__['m'].__get__(obj, obj.__class__)".
For instance bindings, the precedence of descriptor invocation depends
on which descriptor methods are defined. A descriptor can define any
combination of "__get__()", "__set__()" and "__delete__()". If it
does not define "__get__()", then accessing the attribute will return
the descriptor object itself unless there is a value in the object’s
instance dictionary. If the descriptor defines "__set__()" and/or
"__delete__()", it is a data descriptor; if it defines neither, it is
a non-data descriptor. Normally, data descriptors define both
"__get__()" and "__set__()", while non-data descriptors have just the
"__get__()" method. Data descriptors with "__set__()" and "__get__()"
defined always override a redefinition in an instance dictionary. In
contrast, non-data descriptors can be overridden by instances.
Python methods (including "staticmethod()" and "classmethod()") are
implemented as non-data descriptors. Accordingly, instances can
redefine and override methods. This allows individual instances to
acquire behaviors that differ from other instances of the same class.
The "property()" function is implemented as a data descriptor.
Accordingly, instances cannot override the behavior of a property.
__slots__
=========
*__slots__* allow us to explicitly declare data members (like
properties) and deny the creation of *__dict__* and *__weakref__*
(unless explicitly declared in *__slots__* or available in a parent.)
The space saved over using *__dict__* can be significant. Attribute
lookup speed can be significantly improved as well.
object.__slots__
This class variable can be assigned a string, iterable, or sequence
of strings with variable names used by instances. *__slots__*
reserves space for the declared variables and prevents the
automatic creation of *__dict__* and *__weakref__* for each
instance.
Notes on using *__slots__*
--------------------------
* When inheriting from a class without *__slots__*, the *__dict__* and
*__weakref__* attribute of the instances will always be accessible.
* Without a *__dict__* variable, instances cannot be assigned new
variables not listed in the *__slots__* definition. Attempts to
assign to an unlisted variable name raises "AttributeError". If
dynamic assignment of new variables is desired, then add
"'__dict__'" to the sequence of strings in the *__slots__*
declaration.
* Without a *__weakref__* variable for each instance, classes defining
*__slots__* do not support weak references to its instances. If weak
reference support is needed, then add "'__weakref__'" to the
sequence of strings in the *__slots__* declaration.
* *__slots__* are implemented at the class level by creating
descriptors (Implementing Descriptors) for each variable name. As a
result, class attributes cannot be used to set default values for
instance variables defined by *__slots__*; otherwise, the class
attribute would overwrite the descriptor assignment.
* The action of a *__slots__* declaration is not limited to the class
where it is defined. *__slots__* declared in parents are available
in child classes. However, child subclasses will get a *__dict__*
and *__weakref__* unless they also define *__slots__* (which should
only contain names of any *additional* slots).
* If a class defines a slot also defined in a base class, the instance
variable defined by the base class slot is inaccessible (except by
retrieving its descriptor directly from the base class). This
renders the meaning of the program undefined. In the future, a
check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from
“variable-length” built-in types such as "int", "bytes" and "tuple".
* Any non-string iterable may be assigned to *__slots__*. Mappings may
also be used; however, in the future, special meaning may be
assigned to the values corresponding to each key.
* *__class__* assignment works only if both classes have the same
*__slots__*.
* Multiple inheritance with multiple slotted parent classes can be
used, but only one parent is allowed to have attributes created by
slots (the other bases must have empty slot layouts) - violations
raise "TypeError".
* If an iterator is used for *__slots__* then a descriptor is created
for each of the iterator’s values. However, the *__slots__*
attribute will be an empty iterator.
a� Attribute references
********************
An attribute reference is a primary followed by a period and a name:
attributeref ::= primary "." identifier
The primary must evaluate to an object of a type that supports
attribute references, which most objects do. This object is then
asked to produce the attribute whose name is the identifier. This
production can be customized by overriding the "__getattr__()" method.
If this attribute is not available, the exception "AttributeError" is
raised. Otherwise, the type and value of the object produced is
determined by the object. Multiple evaluations of the same attribute
reference may yield different objects.
a� Augmented assignment statements
*******************************
Augmented assignment is the combination, in a single statement, of a
binary operation and an assignment statement:
augmented_assignment_stmt ::= augtarget augop (expression_list | yield_expression)
augtarget ::= identifier | attributeref | subscription | slicing
augop ::= "+=" | "-=" | "*=" | "@=" | "/=" | "//=" | "%=" | "**="
| ">>=" | "<<=" | "&=" | "^=" | "|="
(See section Primaries for the syntax definitions of the last three
symbols.)
An augmented assignment evaluates the target (which, unlike normal
assignment statements, cannot be an unpacking) and the expression
list, performs the binary operation specific to the type of assignment
on the two operands, and assigns the result to the original target.
The target is only evaluated once.
An augmented assignment expression like "x += 1" can be rewritten as
"x = x + 1" to achieve a similar, but not exactly equal effect. In the
augmented version, "x" is only evaluated once. Also, when possible,
the actual operation is performed *in-place*, meaning that rather than
creating a new object and assigning that to the target, the old object
is modified instead.
Unlike normal assignments, augmented assignments evaluate the left-
hand side *before* evaluating the right-hand side. For example, "a[i]
+= f(x)" first looks-up "a[i]", then it evaluates "f(x)" and performs
the addition, and lastly, it writes the result back to "a[i]".
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments. Similarly,
with the exception of the possible *in-place* behavior, the binary
operation performed by augmented assignment is the same as the normal
binary operations.
For targets which are attribute references, the same caveat about
class and instance attributes applies as for regular assignments.
z�Await expression
****************
Suspend the execution of *coroutine* on an *awaitable* object. Can
only be used inside a *coroutine function*.
await_expr ::= "await" primary
New in version 3.5.
uj Binary arithmetic operations
****************************
The binary arithmetic operations have the conventional priority
levels. Note that some of these operations also apply to certain non-
numeric types. Apart from the power operator, there are only two
levels, one for multiplicative operators and one for additive
operators:
m_expr ::= u_expr | m_expr "*" u_expr | m_expr "@" m_expr |
m_expr "//" u_expr | m_expr "/" u_expr |
m_expr "%" u_expr
a_expr ::= m_expr | a_expr "+" m_expr | a_expr "-" m_expr
The "*" (multiplication) operator yields the product of its arguments.
The arguments must either both be numbers, or one argument must be an
integer and the other must be a sequence. In the former case, the
numbers are converted to a common type and then multiplied together.
In the latter case, sequence repetition is performed; a negative
repetition factor yields an empty sequence.
The "@" (at) operator is intended to be used for matrix
multiplication. No builtin Python types implement this operator.
New in version 3.5.
The "/" (division) and "//" (floor division) operators yield the
quotient of their arguments. The numeric arguments are first
converted to a common type. Division of integers yields a float, while
floor division of integers results in an integer; the result is that
of mathematical division with the ‘floor’ function applied to the
result. Division by zero raises the "ZeroDivisionError" exception.
The "%" (modulo) operator yields the remainder from the division of
the first argument by the second. The numeric arguments are first
converted to a common type. A zero right argument raises the
"ZeroDivisionError" exception. The arguments may be floating point
numbers, e.g., "3.14%0.7" equals "0.34" (since "3.14" equals "4*0.7 +
0.34".) The modulo operator always yields a result with the same sign
as its second operand (or zero); the absolute value of the result is
strictly smaller than the absolute value of the second operand [1].
The floor division and modulo operators are connected by the following
identity: "x == (x//y)*y + (x%y)". Floor division and modulo are also
connected with the built-in function "divmod()": "divmod(x, y) ==
(x//y, x%y)". [2].
In addition to performing the modulo operation on numbers, the "%"
operator is also overloaded by string objects to perform old-style
string formatting (also known as interpolation). The syntax for
string formatting is described in the Python Library Reference,
section printf-style String Formatting.
The floor division operator, the modulo operator, and the "divmod()"
function are not defined for complex numbers. Instead, convert to a
floating point number using the "abs()" function if appropriate.
The "+" (addition) operator yields the sum of its arguments. The
arguments must either both be numbers or both be sequences of the same
type. In the former case, the numbers are converted to a common type
and then added together. In the latter case, the sequences are
concatenated.
The "-" (subtraction) operator yields the difference of its arguments.
The numeric arguments are first converted to a common type.
a$ Binary bitwise operations
*************************
Each of the three bitwise operations has a different priority level:
and_expr ::= shift_expr | and_expr "&" shift_expr
xor_expr ::= and_expr | xor_expr "^" and_expr
or_expr ::= xor_expr | or_expr "|" xor_expr
The "&" operator yields the bitwise AND of its arguments, which must
be integers.
The "^" operator yields the bitwise XOR (exclusive OR) of its
arguments, which must be integers.
The "|" operator yields the bitwise (inclusive) OR of its arguments,
which must be integers.
u� Code Objects
************
Code objects are used by the implementation to represent “pseudo-
compiled” executable Python code such as a function body. They differ
from function objects because they don’t contain a reference to their
global execution environment. Code objects are returned by the built-
in "compile()" function and can be extracted from function objects
through their "__code__" attribute. See also the "code" module.
Accessing "__code__" raises an auditing event "object.__getattr__"
with arguments "obj" and ""__code__"".
A code object can be executed or evaluated by passing it (instead of a
source string) to the "exec()" or "eval()" built-in functions.
See The standard type hierarchy for more information.
a. The Ellipsis Object
*******************
This object is commonly used by slicing (see Slicings). It supports
no special operations. There is exactly one ellipsis object, named
"Ellipsis" (a built-in name). "type(Ellipsis)()" produces the
"Ellipsis" singleton.
It is written as "Ellipsis" or "...".
u The Null Object
***************
This object is returned by functions that don’t explicitly return a
value. It supports no special operations. There is exactly one null
object, named "None" (a built-in name). "type(None)()" produces the
same singleton.
It is written as "None".
u5 Type Objects
************
Type objects represent the various object types. An object’s type is
accessed by the built-in function "type()". There are no special
operations on types. The standard module "types" defines names for
all standard built-in types.
Types are written like this: "<class 'int'>".
a� Boolean operations
******************
or_test ::= and_test | or_test "or" and_test
and_test ::= not_test | and_test "and" not_test
not_test ::= comparison | "not" not_test
In the context of Boolean operations, and also when expressions are
used by control flow statements, the following values are interpreted
as false: "False", "None", numeric zero of all types, and empty
strings and containers (including strings, tuples, lists,
dictionaries, sets and frozensets). All other values are interpreted
as true. User-defined objects can customize their truth value by
providing a "__bool__()" method.
The operator "not" yields "True" if its argument is false, "False"
otherwise.
The expression "x and y" first evaluates *x*; if *x* is false, its
value is returned; otherwise, *y* is evaluated and the resulting value
is returned.
The expression "x or y" first evaluates *x*; if *x* is true, its value
is returned; otherwise, *y* is evaluated and the resulting value is
returned.
Note that neither "and" nor "or" restrict the value and type they
return to "False" and "True", but rather return the last evaluated
argument. This is sometimes useful, e.g., if "s" is a string that
should be replaced by a default value if it is empty, the expression
"s or 'foo'" yields the desired value. Because "not" has to create a
new value, it returns a boolean value regardless of the type of its
argument (for example, "not 'foo'" produces "False" rather than "''".)
a$ The "break" statement
*********************
break_stmt ::= "break"
"break" may only occur syntactically nested in a "for" or "while"
loop, but not nested in a function or class definition within that
loop.
It terminates the nearest enclosing loop, skipping the optional "else"
clause if the loop has one.
If a "for" loop is terminated by "break", the loop control target
keeps its current value.
When "break" passes control out of a "try" statement with a "finally"
clause, that "finally" clause is executed before really leaving the
loop.
u Emulating callable objects
**************************
object.__call__(self[, args...])
Called when the instance is “called” as a function; if this method
is defined, "x(arg1, arg2, ...)" roughly translates to
"type(x).__call__(x, arg1, ...)".
u� Calls
*****
A call calls a callable object (e.g., a *function*) with a possibly
empty series of *arguments*:
call ::= primary "(" [argument_list [","] | comprehension] ")"
argument_list ::= positional_arguments ["," starred_and_keywords]
["," keywords_arguments]
| starred_and_keywords ["," keywords_arguments]
| keywords_arguments
positional_arguments ::= positional_item ("," positional_item)*
positional_item ::= assignment_expression | "*" expression
starred_and_keywords ::= ("*" expression | keyword_item)
("," "*" expression | "," keyword_item)*
keywords_arguments ::= (keyword_item | "**" expression)
("," keyword_item | "," "**" expression)*
keyword_item ::= identifier "=" expression
An optional trailing comma may be present after the positional and
keyword arguments but does not affect the semantics.
The primary must evaluate to a callable object (user-defined
functions, built-in functions, methods of built-in objects, class
objects, methods of class instances, and all objects having a
"__call__()" method are callable). All argument expressions are
evaluated before the call is attempted. Please refer to section
Function definitions for the syntax of formal *parameter* lists.
If keyword arguments are present, they are first converted to
positional arguments, as follows. First, a list of unfilled slots is
created for the formal parameters. If there are N positional
arguments, they are placed in the first N slots. Next, for each
keyword argument, the identifier is used to determine the
corresponding slot (if the identifier is the same as the first formal
parameter name, the first slot is used, and so on). If the slot is
already filled, a "TypeError" exception is raised. Otherwise, the
value of the argument is placed in the slot, filling it (even if the
expression is "None", it fills the slot). When all arguments have
been processed, the slots that are still unfilled are filled with the
corresponding default value from the function definition. (Default
values are calculated, once, when the function is defined; thus, a
mutable object such as a list or dictionary used as default value will
be shared by all calls that don’t specify an argument value for the
corresponding slot; this should usually be avoided.) If there are any
unfilled slots for which no default value is specified, a "TypeError"
exception is raised. Otherwise, the list of filled slots is used as
the argument list for the call.
**CPython implementation detail:** An implementation may provide
built-in functions whose positional parameters do not have names, even
if they are ‘named’ for the purpose of documentation, and which
therefore cannot be supplied by keyword. In CPython, this is the case
for functions implemented in C that use "PyArg_ParseTuple()" to parse
their arguments.
If there are more positional arguments than there are formal parameter
slots, a "TypeError" exception is raised, unless a formal parameter
using the syntax "*identifier" is present; in this case, that formal
parameter receives a tuple containing the excess positional arguments
(or an empty tuple if there were no excess positional arguments).
If any keyword argument does not correspond to a formal parameter
name, a "TypeError" exception is raised, unless a formal parameter
using the syntax "**identifier" is present; in this case, that formal
parameter receives a dictionary containing the excess keyword
arguments (using the keywords as keys and the argument values as
corresponding values), or a (new) empty dictionary if there were no
excess keyword arguments.
If the syntax "*expression" appears in the function call, "expression"
must evaluate to an *iterable*. Elements from these iterables are
treated as if they were additional positional arguments. For the call
"f(x1, x2, *y, x3, x4)", if *y* evaluates to a sequence *y1*, …, *yM*,
this is equivalent to a call with M+4 positional arguments *x1*, *x2*,
*y1*, …, *yM*, *x3*, *x4*.
A consequence of this is that although the "*expression" syntax may
appear *after* explicit keyword arguments, it is processed *before*
the keyword arguments (and any "**expression" arguments – see below).
So:
>>> def f(a, b):
... print(a, b)
...
>>> f(b=1, *(2,))
2 1
>>> f(a=1, *(2,))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: f() got multiple values for keyword argument 'a'
>>> f(1, *(2,))
1 2
It is unusual for both keyword arguments and the "*expression" syntax
to be used in the same call, so in practice this confusion does not
arise.
If the syntax "**expression" appears in the function call,
"expression" must evaluate to a *mapping*, the contents of which are
treated as additional keyword arguments. If a keyword is already
present (as an explicit keyword argument, or from another unpacking),
a "TypeError" exception is raised.
Formal parameters using the syntax "*identifier" or "**identifier"
cannot be used as positional argument slots or as keyword argument
names.
Changed in version 3.5: Function calls accept any number of "*" and
"**" unpackings, positional arguments may follow iterable unpackings
("*"), and keyword arguments may follow dictionary unpackings ("**").
Originally proposed by **PEP 448**.
A call always returns some value, possibly "None", unless it raises an
exception. How this value is computed depends on the type of the
callable object.
If it is—
a user-defined function:
The code block for the function is executed, passing it the
argument list. The first thing the code block will do is bind the
formal parameters to the arguments; this is described in section
Function definitions. When the code block executes a "return"
statement, this specifies the return value of the function call.
a built-in function or method:
The result is up to the interpreter; see Built-in Functions for the
descriptions of built-in functions and methods.
a class object:
A new instance of that class is returned.
a class instance method:
The corresponding user-defined function is called, with an argument
list that is one longer than the argument list of the call: the
instance becomes the first argument.
a class instance:
The class must define a "__call__()" method; the effect is then the
same as if that method was called.
u Class definitions
*****************
A class definition defines a class object (see section The standard
type hierarchy):
classdef ::= [decorators] "class" classname [inheritance] ":" suite
inheritance ::= "(" [argument_list] ")"
classname ::= identifier
A class definition is an executable statement. The inheritance list
usually gives a list of base classes (see Metaclasses for more
advanced uses), so each item in the list should evaluate to a class
object which allows subclassing. Classes without an inheritance list
inherit, by default, from the base class "object"; hence,
class Foo:
pass
is equivalent to
class Foo(object):
pass
The class’s suite is then executed in a new execution frame (see
Naming and binding), using a newly created local namespace and the
original global namespace. (Usually, the suite contains mostly
function definitions.) When the class’s suite finishes execution, its
execution frame is discarded but its local namespace is saved. [3] A
class object is then created using the inheritance list for the base
classes and the saved local namespace for the attribute dictionary.
The class name is bound to this class object in the original local
namespace.
The order in which attributes are defined in the class body is
preserved in the new class’s "__dict__". Note that this is reliable
only right after the class is created and only for classes that were
defined using the definition syntax.
Class creation can be customized heavily using metaclasses.
Classes can also be decorated: just like when decorating functions,
@f1(arg)
@f2
class Foo: pass
is roughly equivalent to
class Foo: pass
Foo = f1(arg)(f2(Foo))
The evaluation rules for the decorator expressions are the same as for
function decorators. The result is then bound to the class name.
**Programmer’s note:** Variables defined in the class definition are
class attributes; they are shared by instances. Instance attributes
can be set in a method with "self.name = value". Both class and
instance attributes are accessible through the notation “"self.name"”,
and an instance attribute hides a class attribute with the same name
when accessed in this way. Class attributes can be used as defaults
for instance attributes, but using mutable values there can lead to
unexpected results. Descriptors can be used to create instance
variables with different implementation details.
See also:
**PEP 3115** - Metaclasses in Python 3000
The proposal that changed the declaration of metaclasses to the
current syntax, and the semantics for how classes with
metaclasses are constructed.
**PEP 3129** - Class Decorators
The proposal that added class decorators. Function and method
decorators were introduced in **PEP 318**.
u�' Comparisons
***********
Unlike C, all comparison operations in Python have the same priority,
which is lower than that of any arithmetic, shifting or bitwise
operation. Also unlike C, expressions like "a < b < c" have the
interpretation that is conventional in mathematics:
comparison ::= or_expr (comp_operator or_expr)*
comp_operator ::= "<" | ">" | "==" | ">=" | "<=" | "!="
| "is" ["not"] | ["not"] "in"
Comparisons yield boolean values: "True" or "False".
Comparisons can be chained arbitrarily, e.g., "x < y <= z" is
equivalent to "x < y and y <= z", except that "y" is evaluated only
once (but in both cases "z" is not evaluated at all when "x < y" is
found to be false).
Formally, if *a*, *b*, *c*, …, *y*, *z* are expressions and *op1*,
*op2*, …, *opN* are comparison operators, then "a op1 b op2 c ... y
opN z" is equivalent to "a op1 b and b op2 c and ... y opN z", except
that each expression is evaluated at most once.
Note that "a op1 b op2 c" doesn’t imply any kind of comparison between
*a* and *c*, so that, e.g., "x < y > z" is perfectly legal (though
perhaps not pretty).
Value comparisons
=================
The operators "<", ">", "==", ">=", "<=", and "!=" compare the values
of two objects. The objects do not need to have the same type.
Chapter Objects, values and types states that objects have a value (in
addition to type and identity). The value of an object is a rather
abstract notion in Python: For example, there is no canonical access
method for an object’s value. Also, there is no requirement that the
value of an object should be constructed in a particular way, e.g.
comprised of all its data attributes. Comparison operators implement a
particular notion of what the value of an object is. One can think of
them as defining the value of an object indirectly, by means of their
comparison implementation.
Because all types are (direct or indirect) subtypes of "object", they
inherit the default comparison behavior from "object". Types can
customize their comparison behavior by implementing *rich comparison
methods* like "__lt__()", described in Basic customization.
The default behavior for equality comparison ("==" and "!=") is based
on the identity of the objects. Hence, equality comparison of
instances with the same identity results in equality, and equality
comparison of instances with different identities results in
inequality. A motivation for this default behavior is the desire that
all objects should be reflexive (i.e. "x is y" implies "x == y").
A default order comparison ("<", ">", "<=", and ">=") is not provided;
an attempt raises "TypeError". A motivation for this default behavior
is the lack of a similar invariant as for equality.
The behavior of the default equality comparison, that instances with
different identities are always unequal, may be in contrast to what
types will need that have a sensible definition of object value and
value-based equality. Such types will need to customize their
comparison behavior, and in fact, a number of built-in types have done
that.
The following list describes the comparison behavior of the most
important built-in types.
* Numbers of built-in numeric types (Numeric Types — int, float,
complex) and of the standard library types "fractions.Fraction" and
"decimal.Decimal" can be compared within and across their types,
with the restriction that complex numbers do not support order
comparison. Within the limits of the types involved, they compare
mathematically (algorithmically) correct without loss of precision.
The not-a-number values "float('NaN')" and "decimal.Decimal('NaN')"
are special. Any ordered comparison of a number to a not-a-number
value is false. A counter-intuitive implication is that not-a-number
values are not equal to themselves. For example, if "x =
float('NaN')", "3 < x", "x < 3" and "x == x" are all false, while "x
!= x" is true. This behavior is compliant with IEEE 754.
* "None" and "NotImplemented" are singletons. **PEP 8** advises that
comparisons for singletons should always be done with "is" or "is
not", never the equality operators.
* Binary sequences (instances of "bytes" or "bytearray") can be
compared within and across their types. They compare
lexicographically using the numeric values of their elements.
* Strings (instances of "str") compare lexicographically using the
numerical Unicode code points (the result of the built-in function
"ord()") of their characters. [3]
Strings and binary sequences cannot be directly compared.
* Sequences (instances of "tuple", "list", or "range") can be compared
only within each of their types, with the restriction that ranges do
not support order comparison. Equality comparison across these
types results in inequality, and ordering comparison across these
types raises "TypeError".
Sequences compare lexicographically using comparison of
corresponding elements. The built-in containers typically assume
identical objects are equal to themselves. That lets them bypass
equality tests for identical objects to improve performance and to
maintain their internal invariants.
Lexicographical comparison between built-in collections works as
follows:
* For two collections to compare equal, they must be of the same
type, have the same length, and each pair of corresponding
elements must compare equal (for example, "[1,2] == (1,2)" is
false because the type is not the same).
* Collections that support order comparison are ordered the same as
their first unequal elements (for example, "[1,2,x] <= [1,2,y]"
has the same value as "x <= y"). If a corresponding element does
not exist, the shorter collection is ordered first (for example,
"[1,2] < [1,2,3]" is true).
* Mappings (instances of "dict") compare equal if and only if they
have equal *(key, value)* pairs. Equality comparison of the keys and
values enforces reflexivity.
Order comparisons ("<", ">", "<=", and ">=") raise "TypeError".
* Sets (instances of "set" or "frozenset") can be compared within and
across their types.
They define order comparison operators to mean subset and superset
tests. Those relations do not define total orderings (for example,
the two sets "{1,2}" and "{2,3}" are not equal, nor subsets of one
another, nor supersets of one another). Accordingly, sets are not
appropriate arguments for functions which depend on total ordering
(for example, "min()", "max()", and "sorted()" produce undefined
results given a list of sets as inputs).
Comparison of sets enforces reflexivity of its elements.
* Most other built-in types have no comparison methods implemented, so
they inherit the default comparison behavior.
User-defined classes that customize their comparison behavior should
follow some consistency rules, if possible:
* Equality comparison should be reflexive. In other words, identical
objects should compare equal:
"x is y" implies "x == y"
* Comparison should be symmetric. In other words, the following
expressions should have the same result:
"x == y" and "y == x"
"x != y" and "y != x"
"x < y" and "y > x"
"x <= y" and "y >= x"
* Comparison should be transitive. The following (non-exhaustive)
examples illustrate that:
"x > y and y > z" implies "x > z"
"x < y and y <= z" implies "x < z"
* Inverse comparison should result in the boolean negation. In other
words, the following expressions should have the same result:
"x == y" and "not x != y"
"x < y" and "not x >= y" (for total ordering)
"x > y" and "not x <= y" (for total ordering)
The last two expressions apply to totally ordered collections (e.g.
to sequences, but not to sets or mappings). See also the
"total_ordering()" decorator.
* The "hash()" result should be consistent with equality. Objects that
are equal should either have the same hash value, or be marked as
unhashable.
Python does not enforce these consistency rules. In fact, the
not-a-number values are an example for not following these rules.
Membership test operations
==========================
The operators "in" and "not in" test for membership. "x in s"
evaluates to "True" if *x* is a member of *s*, and "False" otherwise.
"x not in s" returns the negation of "x in s". All built-in sequences
and set types support this as well as dictionary, for which "in" tests
whether the dictionary has a given key. For container types such as
list, tuple, set, frozenset, dict, or collections.deque, the
expression "x in y" is equivalent to "any(x is e or x == e for e in
y)".
For the string and bytes types, "x in y" is "True" if and only if *x*
is a substring of *y*. An equivalent test is "y.find(x) != -1".
Empty strings are always considered to be a substring of any other
string, so """ in "abc"" will return "True".
For user-defined classes which define the "__contains__()" method, "x
in y" returns "True" if "y.__contains__(x)" returns a true value, and
"False" otherwise.
For user-defined classes which do not define "__contains__()" but do
define "__iter__()", "x in y" is "True" if some value "z", for which
the expression "x is z or x == z" is true, is produced while iterating
over "y". If an exception is raised during the iteration, it is as if
"in" raised that exception.
Lastly, the old-style iteration protocol is tried: if a class defines
"__getitem__()", "x in y" is "True" if and only if there is a non-
negative integer index *i* such that "x is y[i] or x == y[i]", and no
lower integer index raises the "IndexError" exception. (If any other
exception is raised, it is as if "in" raised that exception).
The operator "not in" is defined to have the inverse truth value of
"in".
Identity comparisons
====================
The operators "is" and "is not" test for an object’s identity: "x is
y" is true if and only if *x* and *y* are the same object. An
Object’s identity is determined using the "id()" function. "x is not
y" yields the inverse truth value. [4]
u�l Compound statements
*******************
Compound statements contain (groups of) other statements; they affect
or control the execution of those other statements in some way. In
general, compound statements span multiple lines, although in simple
incarnations a whole compound statement may be contained in one line.
The "if", "while" and "for" statements implement traditional control
flow constructs. "try" specifies exception handlers and/or cleanup
code for a group of statements, while the "with" statement allows the
execution of initialization and finalization code around a block of
code. Function and class definitions are also syntactically compound
statements.
A compound statement consists of one or more ‘clauses.’ A clause
consists of a header and a ‘suite.’ The clause headers of a
particular compound statement are all at the same indentation level.
Each clause header begins with a uniquely identifying keyword and ends
with a colon. A suite is a group of statements controlled by a
clause. A suite can be one or more semicolon-separated simple
statements on the same line as the header, following the header’s
colon, or it can be one or more indented statements on subsequent
lines. Only the latter form of a suite can contain nested compound
statements; the following is illegal, mostly because it wouldn’t be
clear to which "if" clause a following "else" clause would belong:
if test1: if test2: print(x)
Also note that the semicolon binds tighter than the colon in this
context, so that in the following example, either all or none of the
"print()" calls are executed:
if x < y < z: print(x); print(y); print(z)
Summarizing:
compound_stmt ::= if_stmt
| while_stmt
| for_stmt
| try_stmt
| with_stmt
| funcdef
| classdef
| async_with_stmt
| async_for_stmt
| async_funcdef
suite ::= stmt_list NEWLINE | NEWLINE INDENT statement+ DEDENT
statement ::= stmt_list NEWLINE | compound_stmt
stmt_list ::= simple_stmt (";" simple_stmt)* [";"]
Note that statements always end in a "NEWLINE" possibly followed by a
"DEDENT". Also note that optional continuation clauses always begin
with a keyword that cannot start a statement, thus there are no
ambiguities (the ‘dangling "else"’ problem is solved in Python by
requiring nested "if" statements to be indented).
The formatting of the grammar rules in the following sections places
each clause on a separate line for clarity.
The "if" statement
==================
The "if" statement is used for conditional execution:
if_stmt ::= "if" assignment_expression ":" suite
("elif" assignment_expression ":" suite)*
["else" ":" suite]
It selects exactly one of the suites by evaluating the expressions one
by one until one is found to be true (see section Boolean operations
for the definition of true and false); then that suite is executed
(and no other part of the "if" statement is executed or evaluated).
If all expressions are false, the suite of the "else" clause, if
present, is executed.
The "while" statement
=====================
The "while" statement is used for repeated execution as long as an
expression is true:
while_stmt ::= "while" assignment_expression ":" suite
["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the
first suite; if the expression is false (which may be the first time
it is tested) the suite of the "else" clause, if present, is executed
and the loop terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and goes back
to testing the expression.
The "for" statement
===================
The "for" statement is used to iterate over the elements of a sequence
(such as a string, tuple or list) or other iterable object:
for_stmt ::= "for" target_list "in" expression_list ":" suite
["else" ":" suite]
The expression list is evaluated once; it should yield an iterable
object. An iterator is created for the result of the
"expression_list". The suite is then executed once for each item
provided by the iterator, in the order returned by the iterator. Each
item in turn is assigned to the target list using the standard rules
for assignments (see Assignment statements), and then the suite is
executed. When the items are exhausted (which is immediately when the
sequence is empty or an iterator raises a "StopIteration" exception),
the suite in the "else" clause, if present, is executed, and the loop
terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and continues
with the next item, or with the "else" clause if there is no next
item.
The for-loop makes assignments to the variables in the target list.
This overwrites all previous assignments to those variables including
those made in the suite of the for-loop:
for i in range(10):
print(i)
i = 5 # this will not affect the for-loop
# because i will be overwritten with the next
# index in the range
Names in the target list are not deleted when the loop is finished,
but if the sequence is empty, they will not have been assigned to at
all by the loop. Hint: the built-in function "range()" returns an
iterator of integers suitable to emulate the effect of Pascal’s "for i
:= a to b do"; e.g., "list(range(3))" returns the list "[0, 1, 2]".
Note:
There is a subtlety when the sequence is being modified by the loop
(this can only occur for mutable sequences, e.g. lists). An
internal counter is used to keep track of which item is used next,
and this is incremented on each iteration. When this counter has
reached the length of the sequence the loop terminates. This means
that if the suite deletes the current (or a previous) item from the
sequence, the next item will be skipped (since it gets the index of
the current item which has already been treated). Likewise, if the
suite inserts an item in the sequence before the current item, the
current item will be treated again the next time through the loop.
This can lead to nasty bugs that can be avoided by making a
temporary copy using a slice of the whole sequence, e.g.,
for x in a[:]:
if x < 0: a.remove(x)
The "try" statement
===================
The "try" statement specifies exception handlers and/or cleanup code
for a group of statements:
try_stmt ::= try1_stmt | try2_stmt
try1_stmt ::= "try" ":" suite
("except" [expression ["as" identifier]] ":" suite)+
["else" ":" suite]
["finally" ":" suite]
try2_stmt ::= "try" ":" suite
"finally" ":" suite
The "except" clause(s) specify one or more exception handlers. When no
exception occurs in the "try" clause, no exception handler is
executed. When an exception occurs in the "try" suite, a search for an
exception handler is started. This search inspects the except clauses
in turn until one is found that matches the exception. An expression-
less except clause, if present, must be last; it matches any
exception. For an except clause with an expression, that expression
is evaluated, and the clause matches the exception if the resulting
object is “compatible” with the exception. An object is compatible
with an exception if it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base
class of the exception object.
If no except clause matches the exception, the search for an exception
handler continues in the surrounding code and on the invocation stack.
[1]
If the evaluation of an expression in the header of an except clause
raises an exception, the original search for a handler is canceled and
a search starts for the new exception in the surrounding code and on
the call stack (it is treated as if the entire "try" statement raised
the exception).
When a matching except clause is found, the exception is assigned to
the target specified after the "as" keyword in that except clause, if
present, and the except clause’s suite is executed. All except
clauses must have an executable block. When the end of this block is
reached, execution continues normally after the entire try statement.
(This means that if two nested handlers exist for the same exception,
and the exception occurs in the try clause of the inner handler, the
outer handler will not handle the exception.)
When an exception has been assigned using "as target", it is cleared
at the end of the except clause. This is as if
except E as N:
foo
was translated to
except E as N:
try:
foo
finally:
del N
This means the exception must be assigned to a different name to be
able to refer to it after the except clause. Exceptions are cleared
because with the traceback attached to them, they form a reference
cycle with the stack frame, keeping all locals in that frame alive
until the next garbage collection occurs.
Before an except clause’s suite is executed, details about the
exception are stored in the "sys" module and can be accessed via
"sys.exc_info()". "sys.exc_info()" returns a 3-tuple consisting of the
exception class, the exception instance and a traceback object (see
section The standard type hierarchy) identifying the point in the
program where the exception occurred. "sys.exc_info()" values are
restored to their previous values (before the call) when returning
from a function that handled an exception.
The optional "else" clause is executed if the control flow leaves the
"try" suite, no exception was raised, and no "return", "continue", or
"break" statement was executed. Exceptions in the "else" clause are
not handled by the preceding "except" clauses.
If "finally" is present, it specifies a ‘cleanup’ handler. The "try"
clause is executed, including any "except" and "else" clauses. If an
exception occurs in any of the clauses and is not handled, the
exception is temporarily saved. The "finally" clause is executed. If
there is a saved exception it is re-raised at the end of the "finally"
clause. If the "finally" clause raises another exception, the saved
exception is set as the context of the new exception. If the "finally"
clause executes a "return", "break" or "continue" statement, the saved
exception is discarded:
>>> def f():
... try:
... 1/0
... finally:
... return 42
...
>>> f()
42
The exception information is not available to the program during
execution of the "finally" clause.
When a "return", "break" or "continue" statement is executed in the
"try" suite of a "try"…"finally" statement, the "finally" clause is
also executed ‘on the way out.’
The return value of a function is determined by the last "return"
statement executed. Since the "finally" clause always executes, a
"return" statement executed in the "finally" clause will always be the
last one executed:
>>> def foo():
... try:
... return 'try'
... finally:
... return 'finally'
...
>>> foo()
'finally'
Additional information on exceptions can be found in section
Exceptions, and information on using the "raise" statement to generate
exceptions may be found in section The raise statement.
Changed in version 3.8: Prior to Python 3.8, a "continue" statement
was illegal in the "finally" clause due to a problem with the
implementation.
The "with" statement
====================
The "with" statement is used to wrap the execution of a block with
methods defined by a context manager (see section With Statement
Context Managers). This allows common "try"…"except"…"finally" usage
patterns to be encapsulated for convenient reuse.
with_stmt ::= "with" with_item ("," with_item)* ":" suite
with_item ::= expression ["as" target]
The execution of the "with" statement with one “item” proceeds as
follows:
1. The context expression (the expression given in the "with_item") is
evaluated to obtain a context manager.
2. The context manager’s "__enter__()" is loaded for later use.
3. The context manager’s "__exit__()" is loaded for later use.
4. The context manager’s "__enter__()" method is invoked.
5. If a target was included in the "with" statement, the return value
from "__enter__()" is assigned to it.
Note:
The "with" statement guarantees that if the "__enter__()" method
returns without an error, then "__exit__()" will always be
called. Thus, if an error occurs during the assignment to the
target list, it will be treated the same as an error occurring
within the suite would be. See step 6 below.
6. The suite is executed.
7. The context manager’s "__exit__()" method is invoked. If an
exception caused the suite to be exited, its type, value, and
traceback are passed as arguments to "__exit__()". Otherwise, three
"None" arguments are supplied.
If the suite was exited due to an exception, and the return value
from the "__exit__()" method was false, the exception is reraised.
If the return value was true, the exception is suppressed, and
execution continues with the statement following the "with"
statement.
If the suite was exited for any reason other than an exception, the
return value from "__exit__()" is ignored, and execution proceeds
at the normal location for the kind of exit that was taken.
The following code:
with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
With more than one item, the context managers are processed as if
multiple "with" statements were nested:
with A() as a, B() as b:
SUITE
is semantically equivalent to:
with A() as a:
with B() as b:
SUITE
Changed in version 3.1: Support for multiple context expressions.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
Function definitions
====================
A function definition defines a user-defined function object (see
section The standard type hierarchy):
funcdef ::= [decorators] "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
decorators ::= decorator+
decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name ::= identifier ("." identifier)*
parameter_list ::= defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]]
| parameter_list_no_posonly
parameter_list_no_posonly ::= defparameter ("," defparameter)* ["," [parameter_list_starargs]]
| parameter_list_starargs
parameter_list_starargs ::= "*" [parameter] ("," defparameter)* ["," ["**" parameter [","]]]
| "**" parameter [","]
parameter ::= identifier [":" expression]
defparameter ::= parameter ["=" expression]
funcname ::= identifier
A function definition is an executable statement. Its execution binds
the function name in the current local namespace to a function object
(a wrapper around the executable code for the function). This
function object contains a reference to the current global namespace
as the global namespace to be used when the function is called.
The function definition does not execute the function body; this gets
executed only when the function is called. [2]
A function definition may be wrapped by one or more *decorator*
expressions. Decorator expressions are evaluated when the function is
defined, in the scope that contains the function definition. The
result must be a callable, which is invoked with the function object
as the only argument. The returned value is bound to the function name
instead of the function object. Multiple decorators are applied in
nested fashion. For example, the following code
@f1(arg)
@f2
def func(): pass
is roughly equivalent to
def func(): pass
func = f1(arg)(f2(func))
except that the original function is not temporarily bound to the name
"func".
When one or more *parameters* have the form *parameter* "="
*expression*, the function is said to have “default parameter values.”
For a parameter with a default value, the corresponding *argument* may
be omitted from a call, in which case the parameter’s default value is
substituted. If a parameter has a default value, all following
parameters up until the “"*"” must also have a default value — this is
a syntactic restriction that is not expressed by the grammar.
**Default parameter values are evaluated from left to right when the
function definition is executed.** This means that the expression is
evaluated once, when the function is defined, and that the same “pre-
computed” value is used for each call. This is especially important
to understand when a default parameter is a mutable object, such as a
list or a dictionary: if the function modifies the object (e.g. by
appending an item to a list), the default value is in effect modified.
This is generally not what was intended. A way around this is to use
"None" as the default, and explicitly test for it in the body of the
function, e.g.:
def whats_on_the_telly(penguin=None):
if penguin is None:
penguin = []
penguin.append("property of the zoo")
return penguin
Function call semantics are described in more detail in section Calls.
A function call always assigns values to all parameters mentioned in
the parameter list, either from positional arguments, from keyword
arguments, or from default values. If the form “"*identifier"” is
present, it is initialized to a tuple receiving any excess positional
parameters, defaulting to the empty tuple. If the form
“"**identifier"” is present, it is initialized to a new ordered
mapping receiving any excess keyword arguments, defaulting to a new
empty mapping of the same type. Parameters after “"*"” or
“"*identifier"” are keyword-only parameters and may only be passed by
keyword arguments. Parameters before “"/"” are positional-only
parameters and may only be passed by positional arguments.
Changed in version 3.8: The "/" function parameter syntax may be used
to indicate positional-only parameters. See **PEP 570** for details.
Parameters may have an *annotation* of the form “": expression"”
following the parameter name. Any parameter may have an annotation,
even those of the form "*identifier" or "**identifier". Functions may
have “return” annotation of the form “"-> expression"” after the
parameter list. These annotations can be any valid Python expression.
The presence of annotations does not change the semantics of a
function. The annotation values are available as values of a
dictionary keyed by the parameters’ names in the "__annotations__"
attribute of the function object. If the "annotations" import from
"__future__" is used, annotations are preserved as strings at runtime
which enables postponed evaluation. Otherwise, they are evaluated
when the function definition is executed. In this case annotations
may be evaluated in a different order than they appear in the source
code.
It is also possible to create anonymous functions (functions not bound
to a name), for immediate use in expressions. This uses lambda
expressions, described in section Lambdas. Note that the lambda
expression is merely a shorthand for a simplified function definition;
a function defined in a “"def"” statement can be passed around or
assigned to another name just like a function defined by a lambda
expression. The “"def"” form is actually more powerful since it
allows the execution of multiple statements and annotations.
**Programmer’s note:** Functions are first-class objects. A “"def"”
statement executed inside a function definition defines a local
function that can be returned or passed around. Free variables used
in the nested function can access the local variables of the function
containing the def. See section Naming and binding for details.
See also:
**PEP 3107** - Function Annotations
The original specification for function annotations.
**PEP 484** - Type Hints
Definition of a standard meaning for annotations: type hints.
**PEP 526** - Syntax for Variable Annotations
Ability to type hint variable declarations, including class
variables and instance variables
**PEP 563** - Postponed Evaluation of Annotations
Support for forward references within annotations by preserving
annotations in a string form at runtime instead of eager
evaluation.
Class definitions
=================
A class definition defines a class object (see section The standard
type hierarchy):
classdef ::= [decorators] "class" classname [inheritance] ":" suite
inheritance ::= "(" [argument_list] ")"
classname ::= identifier
A class definition is an executable statement. The inheritance list
usually gives a list of base classes (see Metaclasses for more
advanced uses), so each item in the list should evaluate to a class
object which allows subclassing. Classes without an inheritance list
inherit, by default, from the base class "object"; hence,
class Foo:
pass
is equivalent to
class Foo(object):
pass
The class’s suite is then executed in a new execution frame (see
Naming and binding), using a newly created local namespace and the
original global namespace. (Usually, the suite contains mostly
function definitions.) When the class’s suite finishes execution, its
execution frame is discarded but its local namespace is saved. [3] A
class object is then created using the inheritance list for the base
classes and the saved local namespace for the attribute dictionary.
The class name is bound to this class object in the original local
namespace.
The order in which attributes are defined in the class body is
preserved in the new class’s "__dict__". Note that this is reliable
only right after the class is created and only for classes that were
defined using the definition syntax.
Class creation can be customized heavily using metaclasses.
Classes can also be decorated: just like when decorating functions,
@f1(arg)
@f2
class Foo: pass
is roughly equivalent to
class Foo: pass
Foo = f1(arg)(f2(Foo))
The evaluation rules for the decorator expressions are the same as for
function decorators. The result is then bound to the class name.
**Programmer’s note:** Variables defined in the class definition are
class attributes; they are shared by instances. Instance attributes
can be set in a method with "self.name = value". Both class and
instance attributes are accessible through the notation “"self.name"”,
and an instance attribute hides a class attribute with the same name
when accessed in this way. Class attributes can be used as defaults
for instance attributes, but using mutable values there can lead to
unexpected results. Descriptors can be used to create instance
variables with different implementation details.
See also:
**PEP 3115** - Metaclasses in Python 3000
The proposal that changed the declaration of metaclasses to the
current syntax, and the semantics for how classes with
metaclasses are constructed.
**PEP 3129** - Class Decorators
The proposal that added class decorators. Function and method
decorators were introduced in **PEP 318**.
Coroutines
==========
New in version 3.5.
Coroutine function definition
-----------------------------
async_funcdef ::= [decorators] "async" "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
Execution of Python coroutines can be suspended and resumed at many
points (see *coroutine*). Inside the body of a coroutine function,
"await" and "async" identifiers become reserved keywords; "await"
expressions, "async for" and "async with" can only be used in
coroutine function bodies.
Functions defined with "async def" syntax are always coroutine
functions, even if they do not contain "await" or "async" keywords.
It is a "SyntaxError" to use a "yield from" expression inside the body
of a coroutine function.
An example of a coroutine function:
async def func(param1, param2):
do_stuff()
await some_coroutine()
The "async for" statement
-------------------------
async_for_stmt ::= "async" for_stmt
An *asynchronous iterable* is able to call asynchronous code in its
*iter* implementation, and *asynchronous iterator* can call
asynchronous code in its *next* method.
The "async for" statement allows convenient iteration over
asynchronous iterators.
The following code:
async for TARGET in ITER:
SUITE
else:
SUITE2
Is semantically equivalent to:
iter = (ITER)
iter = type(iter).__aiter__(iter)
running = True
while running:
try:
TARGET = await type(iter).__anext__(iter)
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2
See also "__aiter__()" and "__anext__()" for details.
It is a "SyntaxError" to use an "async for" statement outside the body
of a coroutine function.
The "async with" statement
--------------------------
async_with_stmt ::= "async" with_stmt
An *asynchronous context manager* is a *context manager* that is able
to suspend execution in its *enter* and *exit* methods.
The following code:
async with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
aexit = type(manager).__aexit__
aenter = type(manager).__aenter__
value = await aenter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
See also "__aenter__()" and "__aexit__()" for details.
It is a "SyntaxError" to use an "async with" statement outside the
body of a coroutine function.
See also:
**PEP 492** - Coroutines with async and await syntax
The proposal that made coroutines a proper standalone concept in
Python, and added supporting syntax.
-[ Footnotes ]-
[1] The exception is propagated to the invocation stack unless there
is a "finally" clause which happens to raise another exception.
That new exception causes the old one to be lost.
[2] A string literal appearing as the first statement in the function
body is transformed into the function’s "__doc__" attribute and
therefore the function’s *docstring*.
[3] A string literal appearing as the first statement in the class
body is transformed into the namespace’s "__doc__" item and
therefore the class’s *docstring*.
u� With Statement Context Managers
*******************************
A *context manager* is an object that defines the runtime context to
be established when executing a "with" statement. The context manager
handles the entry into, and the exit from, the desired runtime context
for the execution of the block of code. Context managers are normally
invoked using the "with" statement (described in section The with
statement), but can also be used by directly invoking their methods.
Typical uses of context managers include saving and restoring various
kinds of global state, locking and unlocking resources, closing opened
files, etc.
For more information on context managers, see Context Manager Types.
object.__enter__(self)
Enter the runtime context related to this object. The "with"
statement will bind this method’s return value to the target(s)
specified in the "as" clause of the statement, if any.
object.__exit__(self, exc_type, exc_value, traceback)
Exit the runtime context related to this object. The parameters
describe the exception that caused the context to be exited. If the
context was exited without an exception, all three arguments will
be "None".
If an exception is supplied, and the method wishes to suppress the
exception (i.e., prevent it from being propagated), it should
return a true value. Otherwise, the exception will be processed
normally upon exit from this method.
Note that "__exit__()" methods should not reraise the passed-in
exception; this is the caller’s responsibility.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
a� The "continue" statement
************************
continue_stmt ::= "continue"
"continue" may only occur syntactically nested in a "for" or "while"
loop, but not nested in a function or class definition within that
loop. It continues with the next cycle of the nearest enclosing loop.
When "continue" passes control out of a "try" statement with a
"finally" clause, that "finally" clause is executed before really
starting the next loop cycle.
u� Arithmetic conversions
**********************
When a description of an arithmetic operator below uses the phrase
“the numeric arguments are converted to a common type”, this means
that the operator implementation for built-in types works as follows:
* If either argument is a complex number, the other is converted to
complex;
* otherwise, if either argument is a floating point number, the other
is converted to floating point;
* otherwise, both must be integers and no conversion is necessary.
Some additional rules apply for certain operators (e.g., a string as a
left argument to the ‘%’ operator). Extensions must define their own
conversion behavior.
uS5 Basic customization
*******************
object.__new__(cls[, ...])
Called to create a new instance of class *cls*. "__new__()" is a
static method (special-cased so you need not declare it as such)
that takes the class of which an instance was requested as its
first argument. The remaining arguments are those passed to the
object constructor expression (the call to the class). The return
value of "__new__()" should be the new object instance (usually an
instance of *cls*).
Typical implementations create a new instance of the class by
invoking the superclass’s "__new__()" method using
"super().__new__(cls[, ...])" with appropriate arguments and then
modifying the newly-created instance as necessary before returning
it.
If "__new__()" is invoked during object construction and it returns
an instance of *cls*, then the new instance’s "__init__()" method
will be invoked like "__init__(self[, ...])", where *self* is the
new instance and the remaining arguments are the same as were
passed to the object constructor.
If "__new__()" does not return an instance of *cls*, then the new
instance’s "__init__()" method will not be invoked.
"__new__()" is intended mainly to allow subclasses of immutable
types (like int, str, or tuple) to customize instance creation. It
is also commonly overridden in custom metaclasses in order to
customize class creation.
object.__init__(self[, ...])
Called after the instance has been created (by "__new__()"), but
before it is returned to the caller. The arguments are those
passed to the class constructor expression. If a base class has an
"__init__()" method, the derived class’s "__init__()" method, if
any, must explicitly call it to ensure proper initialization of the
base class part of the instance; for example:
"super().__init__([args...])".
Because "__new__()" and "__init__()" work together in constructing
objects ("__new__()" to create it, and "__init__()" to customize
it), no non-"None" value may be returned by "__init__()"; doing so
will cause a "TypeError" to be raised at runtime.
object.__del__(self)
Called when the instance is about to be destroyed. This is also
called a finalizer or (improperly) a destructor. If a base class
has a "__del__()" method, the derived class’s "__del__()" method,
if any, must explicitly call it to ensure proper deletion of the
base class part of the instance.
It is possible (though not recommended!) for the "__del__()" method
to postpone destruction of the instance by creating a new reference
to it. This is called object *resurrection*. It is
implementation-dependent whether "__del__()" is called a second
time when a resurrected object is about to be destroyed; the
current *CPython* implementation only calls it once.
It is not guaranteed that "__del__()" methods are called for
objects that still exist when the interpreter exits.
Note:
"del x" doesn’t directly call "x.__del__()" — the former
decrements the reference count for "x" by one, and the latter is
only called when "x"’s reference count reaches zero.
**CPython implementation detail:** It is possible for a reference
cycle to prevent the reference count of an object from going to
zero. In this case, the cycle will be later detected and deleted
by the *cyclic garbage collector*. A common cause of reference
cycles is when an exception has been caught in a local variable.
The frame’s locals then reference the exception, which references
its own traceback, which references the locals of all frames caught
in the traceback.
See also: Documentation for the "gc" module.
Warning:
Due to the precarious circumstances under which "__del__()"
methods are invoked, exceptions that occur during their execution
are ignored, and a warning is printed to "sys.stderr" instead.
In particular:
* "__del__()" can be invoked when arbitrary code is being
executed, including from any arbitrary thread. If "__del__()"
needs to take a lock or invoke any other blocking resource, it
may deadlock as the resource may already be taken by the code
that gets interrupted to execute "__del__()".
* "__del__()" can be executed during interpreter shutdown. As a
consequence, the global variables it needs to access (including
other modules) may already have been deleted or set to "None".
Python guarantees that globals whose name begins with a single
underscore are deleted from their module before other globals
are deleted; if no other references to such globals exist, this
may help in assuring that imported modules are still available
at the time when the "__del__()" method is called.
object.__repr__(self)
Called by the "repr()" built-in function to compute the “official”
string representation of an object. If at all possible, this
should look like a valid Python expression that could be used to
recreate an object with the same value (given an appropriate
environment). If this is not possible, a string of the form
"<...some useful description...>" should be returned. The return
value must be a string object. If a class defines "__repr__()" but
not "__str__()", then "__repr__()" is also used when an “informal”
string representation of instances of that class is required.
This is typically used for debugging, so it is important that the
representation is information-rich and unambiguous.
object.__str__(self)
Called by "str(object)" and the built-in functions "format()" and
"print()" to compute the “informal” or nicely printable string
representation of an object. The return value must be a string
object.
This method differs from "object.__repr__()" in that there is no
expectation that "__str__()" return a valid Python expression: a
more convenient or concise representation can be used.
The default implementation defined by the built-in type "object"
calls "object.__repr__()".
object.__bytes__(self)
Called by bytes to compute a byte-string representation of an
object. This should return a "bytes" object.
object.__format__(self, format_spec)
Called by the "format()" built-in function, and by extension,
evaluation of formatted string literals and the "str.format()"
method, to produce a “formatted” string representation of an
object. The *format_spec* argument is a string that contains a
description of the formatting options desired. The interpretation
of the *format_spec* argument is up to the type implementing
"__format__()", however most classes will either delegate
formatting to one of the built-in types, or use a similar
formatting option syntax.
See Format Specification Mini-Language for a description of the
standard formatting syntax.
The return value must be a string object.
Changed in version 3.4: The __format__ method of "object" itself
raises a "TypeError" if passed any non-empty string.
Changed in version 3.7: "object.__format__(x, '')" is now
equivalent to "str(x)" rather than "format(str(self), '')".
object.__lt__(self, other)
object.__le__(self, other)
object.__eq__(self, other)
object.__ne__(self, other)
object.__gt__(self, other)
object.__ge__(self, other)
These are the so-called “rich comparison” methods. The
correspondence between operator symbols and method names is as
follows: "x<y" calls "x.__lt__(y)", "x<=y" calls "x.__le__(y)",
"x==y" calls "x.__eq__(y)", "x!=y" calls "x.__ne__(y)", "x>y" calls
"x.__gt__(y)", and "x>=y" calls "x.__ge__(y)".
A rich comparison method may return the singleton "NotImplemented"
if it does not implement the operation for a given pair of
arguments. By convention, "False" and "True" are returned for a
successful comparison. However, these methods can return any value,
so if the comparison operator is used in a Boolean context (e.g.,
in the condition of an "if" statement), Python will call "bool()"
on the value to determine if the result is true or false.
By default, "object" implements "__eq__()" by using "is", returning
"NotImplemented" in the case of a false comparison: "True if x is y
else NotImplemented". For "__ne__()", by default it delegates to
"__eq__()" and inverts the result unless it is "NotImplemented".
There are no other implied relationships among the comparison
operators or default implementations; for example, the truth of
"(x<y or x==y)" does not imply "x<=y". To automatically generate
ordering operations from a single root operation, see
"functools.total_ordering()".
See the paragraph on "__hash__()" for some important notes on
creating *hashable* objects which support custom comparison
operations and are usable as dictionary keys.
There are no swapped-argument versions of these methods (to be used
when the left argument does not support the operation but the right
argument does); rather, "__lt__()" and "__gt__()" are each other’s
reflection, "__le__()" and "__ge__()" are each other’s reflection,
and "__eq__()" and "__ne__()" are their own reflection. If the
operands are of different types, and right operand’s type is a
direct or indirect subclass of the left operand’s type, the
reflected method of the right operand has priority, otherwise the
left operand’s method has priority. Virtual subclassing is not
considered.
object.__hash__(self)
Called by built-in function "hash()" and for operations on members
of hashed collections including "set", "frozenset", and "dict".
"__hash__()" should return an integer. The only required property
is that objects which compare equal have the same hash value; it is
advised to mix together the hash values of the components of the
object that also play a part in comparison of objects by packing
them into a tuple and hashing the tuple. Example:
def __hash__(self):
return hash((self.name, self.nick, self.color))
Note:
"hash()" truncates the value returned from an object’s custom
"__hash__()" method to the size of a "Py_ssize_t". This is
typically 8 bytes on 64-bit builds and 4 bytes on 32-bit builds.
If an object’s "__hash__()" must interoperate on builds of
different bit sizes, be sure to check the width on all supported
builds. An easy way to do this is with "python -c "import sys;
print(sys.hash_info.width)"".
If a class does not define an "__eq__()" method it should not
define a "__hash__()" operation either; if it defines "__eq__()"
but not "__hash__()", its instances will not be usable as items in
hashable collections. If a class defines mutable objects and
implements an "__eq__()" method, it should not implement
"__hash__()", since the implementation of hashable collections
requires that a key’s hash value is immutable (if the object’s hash
value changes, it will be in the wrong hash bucket).
User-defined classes have "__eq__()" and "__hash__()" methods by
default; with them, all objects compare unequal (except with
themselves) and "x.__hash__()" returns an appropriate value such
that "x == y" implies both that "x is y" and "hash(x) == hash(y)".
A class that overrides "__eq__()" and does not define "__hash__()"
will have its "__hash__()" implicitly set to "None". When the
"__hash__()" method of a class is "None", instances of the class
will raise an appropriate "TypeError" when a program attempts to
retrieve their hash value, and will also be correctly identified as
unhashable when checking "isinstance(obj,
collections.abc.Hashable)".
If a class that overrides "__eq__()" needs to retain the
implementation of "__hash__()" from a parent class, the interpreter
must be told this explicitly by setting "__hash__ =
<ParentClass>.__hash__".
If a class that does not override "__eq__()" wishes to suppress
hash support, it should include "__hash__ = None" in the class
definition. A class which defines its own "__hash__()" that
explicitly raises a "TypeError" would be incorrectly identified as
hashable by an "isinstance(obj, collections.abc.Hashable)" call.
Note:
By default, the "__hash__()" values of str and bytes objects are
“salted” with an unpredictable random value. Although they
remain constant within an individual Python process, they are not
predictable between repeated invocations of Python.This is
intended to provide protection against a denial-of-service caused
by carefully-chosen inputs that exploit the worst case
performance of a dict insertion, O(n^2) complexity. See
http://www.ocert.org/advisories/ocert-2011-003.html for
details.Changing hash values affects the iteration order of sets.
Python has never made guarantees about this ordering (and it
typically varies between 32-bit and 64-bit builds).See also
"PYTHONHASHSEED".
Changed in version 3.3: Hash randomization is enabled by default.
object.__bool__(self)
Called to implement truth value testing and the built-in operation
"bool()"; should return "False" or "True". When this method is not
defined, "__len__()" is called, if it is defined, and the object is
considered true if its result is nonzero. If a class defines
neither "__len__()" nor "__bool__()", all its instances are
considered true.
u�I "pdb" — The Python Debugger
***************************
**Source code:** Lib/pdb.py
======================================================================
The module "pdb" defines an interactive source code debugger for
Python programs. It supports setting (conditional) breakpoints and
single stepping at the source line level, inspection of stack frames,
source code listing, and evaluation of arbitrary Python code in the
context of any stack frame. It also supports post-mortem debugging
and can be called under program control.
The debugger is extensible – it is actually defined as the class
"Pdb". This is currently undocumented but easily understood by reading
the source. The extension interface uses the modules "bdb" and "cmd".
The debugger’s prompt is "(Pdb)". Typical usage to run a program under
control of the debugger is:
>>> import pdb
>>> import mymodule
>>> pdb.run('mymodule.test()')
> <string>(0)?()
(Pdb) continue
> <string>(1)?()
(Pdb) continue
NameError: 'spam'
> <string>(1)?()
(Pdb)
Changed in version 3.3: Tab-completion via the "readline" module is
available for commands and command arguments, e.g. the current global
and local names are offered as arguments of the "p" command.
"pdb.py" can also be invoked as a script to debug other scripts. For
example:
python3 -m pdb myscript.py
When invoked as a script, pdb will automatically enter post-mortem
debugging if the program being debugged exits abnormally. After post-
mortem debugging (or after normal exit of the program), pdb will
restart the program. Automatic restarting preserves pdb’s state (such
as breakpoints) and in most cases is more useful than quitting the
debugger upon program’s exit.
New in version 3.2: "pdb.py" now accepts a "-c" option that executes
commands as if given in a ".pdbrc" file, see Debugger Commands.
New in version 3.7: "pdb.py" now accepts a "-m" option that execute
modules similar to the way "python3 -m" does. As with a script, the
debugger will pause execution just before the first line of the
module.
The typical usage to break into the debugger from a running program is
to insert
import pdb; pdb.set_trace()
at the location you want to break into the debugger. You can then
step through the code following this statement, and continue running
without the debugger using the "continue" command.
New in version 3.7: The built-in "breakpoint()", when called with
defaults, can be used instead of "import pdb; pdb.set_trace()".
The typical usage to inspect a crashed program is:
>>> import pdb
>>> import mymodule
>>> mymodule.test()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "./mymodule.py", line 4, in test
test2()
File "./mymodule.py", line 3, in test2
print(spam)
NameError: spam
>>> pdb.pm()
> ./mymodule.py(3)test2()
-> print(spam)
(Pdb)
The module defines the following functions; each enters the debugger
in a slightly different way:
pdb.run(statement, globals=None, locals=None)
Execute the *statement* (given as a string or a code object) under
debugger control. The debugger prompt appears before any code is
executed; you can set breakpoints and type "continue", or you can
step through the statement using "step" or "next" (all these
commands are explained below). The optional *globals* and *locals*
arguments specify the environment in which the code is executed; by
default the dictionary of the module "__main__" is used. (See the
explanation of the built-in "exec()" or "eval()" functions.)
pdb.runeval(expression, globals=None, locals=None)
Evaluate the *expression* (given as a string or a code object)
under debugger control. When "runeval()" returns, it returns the
value of the expression. Otherwise this function is similar to
"run()".
pdb.runcall(function, *args, **kwds)
Call the *function* (a function or method object, not a string)
with the given arguments. When "runcall()" returns, it returns
whatever the function call returned. The debugger prompt appears
as soon as the function is entered.
pdb.set_trace(*, header=None)
Enter the debugger at the calling stack frame. This is useful to
hard-code a breakpoint at a given point in a program, even if the
code is not otherwise being debugged (e.g. when an assertion
fails). If given, *header* is printed to the console just before
debugging begins.
Changed in version 3.7: The keyword-only argument *header*.
pdb.post_mortem(traceback=None)
Enter post-mortem debugging of the given *traceback* object. If no
*traceback* is given, it uses the one of the exception that is
currently being handled (an exception must be being handled if the
default is to be used).
pdb.pm()
Enter post-mortem debugging of the traceback found in
"sys.last_traceback".
The "run*" functions and "set_trace()" are aliases for instantiating
the "Pdb" class and calling the method of the same name. If you want
to access further features, you have to do this yourself:
class pdb.Pdb(completekey='tab', stdin=None, stdout=None, skip=None, nosigint=False, readrc=True)
"Pdb" is the debugger class.
The *completekey*, *stdin* and *stdout* arguments are passed to the
underlying "cmd.Cmd" class; see the description there.
The *skip* argument, if given, must be an iterable of glob-style
module name patterns. The debugger will not step into frames that
originate in a module that matches one of these patterns. [1]
By default, Pdb sets a handler for the SIGINT signal (which is sent
when the user presses "Ctrl-C" on the console) when you give a
"continue" command. This allows you to break into the debugger
again by pressing "Ctrl-C". If you want Pdb not to touch the
SIGINT handler, set *nosigint* to true.
The *readrc* argument defaults to true and controls whether Pdb
will load .pdbrc files from the filesystem.
Example call to enable tracing with *skip*:
import pdb; pdb.Pdb(skip=['django.*']).set_trace()
Raises an auditing event "pdb.Pdb" with no arguments.
New in version 3.1: The *skip* argument.
New in version 3.2: The *nosigint* argument. Previously, a SIGINT
handler was never set by Pdb.
Changed in version 3.6: The *readrc* argument.
run(statement, globals=None, locals=None)
runeval(expression, globals=None, locals=None)
runcall(function, *args, **kwds)
set_trace()
See the documentation for the functions explained above.
Debugger Commands
=================
The commands recognized by the debugger are listed below. Most
commands can be abbreviated to one or two letters as indicated; e.g.
"h(elp)" means that either "h" or "help" can be used to enter the help
command (but not "he" or "hel", nor "H" or "Help" or "HELP").
Arguments to commands must be separated by whitespace (spaces or
tabs). Optional arguments are enclosed in square brackets ("[]") in
the command syntax; the square brackets must not be typed.
Alternatives in the command syntax are separated by a vertical bar
("|").
Entering a blank line repeats the last command entered. Exception: if
the last command was a "list" command, the next 11 lines are listed.
Commands that the debugger doesn’t recognize are assumed to be Python
statements and are executed in the context of the program being
debugged. Python statements can also be prefixed with an exclamation
point ("!"). This is a powerful way to inspect the program being
debugged; it is even possible to change a variable or call a function.
When an exception occurs in such a statement, the exception name is
printed but the debugger’s state is not changed.
The debugger supports aliases. Aliases can have parameters which
allows one a certain level of adaptability to the context under
examination.
Multiple commands may be entered on a single line, separated by ";;".
(A single ";" is not used as it is the separator for multiple commands
in a line that is passed to the Python parser.) No intelligence is
applied to separating the commands; the input is split at the first
";;" pair, even if it is in the middle of a quoted string.
If a file ".pdbrc" exists in the user’s home directory or in the
current directory, it is read in and executed as if it had been typed
at the debugger prompt. This is particularly useful for aliases. If
both files exist, the one in the home directory is read first and
aliases defined there can be overridden by the local file.
Changed in version 3.2: ".pdbrc" can now contain commands that
continue debugging, such as "continue" or "next". Previously, these
commands had no effect.
h(elp) [command]
Without argument, print the list of available commands. With a
*command* as argument, print help about that command. "help pdb"
displays the full documentation (the docstring of the "pdb"
module). Since the *command* argument must be an identifier, "help
exec" must be entered to get help on the "!" command.
w(here)
Print a stack trace, with the most recent frame at the bottom. An
arrow indicates the current frame, which determines the context of
most commands.
d(own) [count]
Move the current frame *count* (default one) levels down in the
stack trace (to a newer frame).
u(p) [count]
Move the current frame *count* (default one) levels up in the stack
trace (to an older frame).
b(reak) [([filename:]lineno | function) [, condition]]
With a *lineno* argument, set a break there in the current file.
With a *function* argument, set a break at the first executable
statement within that function. The line number may be prefixed
with a filename and a colon, to specify a breakpoint in another
file (probably one that hasn’t been loaded yet). The file is
searched on "sys.path". Note that each breakpoint is assigned a
number to which all the other breakpoint commands refer.
If a second argument is present, it is an expression which must
evaluate to true before the breakpoint is honored.
Without argument, list all breaks, including for each breakpoint,
the number of times that breakpoint has been hit, the current
ignore count, and the associated condition if any.
tbreak [([filename:]lineno | function) [, condition]]
Temporary breakpoint, which is removed automatically when it is
first hit. The arguments are the same as for "break".
cl(ear) [filename:lineno | bpnumber [bpnumber ...]]
With a *filename:lineno* argument, clear all the breakpoints at
this line. With a space separated list of breakpoint numbers, clear
those breakpoints. Without argument, clear all breaks (but first
ask confirmation).
disable [bpnumber [bpnumber ...]]
Disable the breakpoints given as a space separated list of
breakpoint numbers. Disabling a breakpoint means it cannot cause
the program to stop execution, but unlike clearing a breakpoint, it
remains in the list of breakpoints and can be (re-)enabled.
enable [bpnumber [bpnumber ...]]
Enable the breakpoints specified.
ignore bpnumber [count]
Set the ignore count for the given breakpoint number. If count is
omitted, the ignore count is set to 0. A breakpoint becomes active
when the ignore count is zero. When non-zero, the count is
decremented each time the breakpoint is reached and the breakpoint
is not disabled and any associated condition evaluates to true.
condition bpnumber [condition]
Set a new *condition* for the breakpoint, an expression which must
evaluate to true before the breakpoint is honored. If *condition*
is absent, any existing condition is removed; i.e., the breakpoint
is made unconditional.
commands [bpnumber]
Specify a list of commands for breakpoint number *bpnumber*. The
commands themselves appear on the following lines. Type a line
containing just "end" to terminate the commands. An example:
(Pdb) commands 1
(com) p some_variable
(com) end
(Pdb)
To remove all commands from a breakpoint, type "commands" and
follow it immediately with "end"; that is, give no commands.
With no *bpnumber* argument, "commands" refers to the last
breakpoint set.
You can use breakpoint commands to start your program up again.
Simply use the "continue" command, or "step", or any other command
that resumes execution.
Specifying any command resuming execution (currently "continue",
"step", "next", "return", "jump", "quit" and their abbreviations)
terminates the command list (as if that command was immediately
followed by end). This is because any time you resume execution
(even with a simple next or step), you may encounter another
breakpoint—which could have its own command list, leading to
ambiguities about which list to execute.
If you use the ‘silent’ command in the command list, the usual
message about stopping at a breakpoint is not printed. This may be
desirable for breakpoints that are to print a specific message and
then continue. If none of the other commands print anything, you
see no sign that the breakpoint was reached.
s(tep)
Execute the current line, stop at the first possible occasion
(either in a function that is called or on the next line in the
current function).
n(ext)
Continue execution until the next line in the current function is
reached or it returns. (The difference between "next" and "step"
is that "step" stops inside a called function, while "next"
executes called functions at (nearly) full speed, only stopping at
the next line in the current function.)
unt(il) [lineno]
Without argument, continue execution until the line with a number
greater than the current one is reached.
With a line number, continue execution until a line with a number
greater or equal to that is reached. In both cases, also stop when
the current frame returns.
Changed in version 3.2: Allow giving an explicit line number.
r(eturn)
Continue execution until the current function returns.
c(ont(inue))
Continue execution, only stop when a breakpoint is encountered.
j(ump) lineno
Set the next line that will be executed. Only available in the
bottom-most frame. This lets you jump back and execute code again,
or jump forward to skip code that you don’t want to run.
It should be noted that not all jumps are allowed – for instance it
is not possible to jump into the middle of a "for" loop or out of a
"finally" clause.
l(ist) [first[, last]]
List source code for the current file. Without arguments, list 11
lines around the current line or continue the previous listing.
With "." as argument, list 11 lines around the current line. With
one argument, list 11 lines around at that line. With two
arguments, list the given range; if the second argument is less
than the first, it is interpreted as a count.
The current line in the current frame is indicated by "->". If an
exception is being debugged, the line where the exception was
originally raised or propagated is indicated by ">>", if it differs
from the current line.
New in version 3.2: The ">>" marker.
ll | longlist
List all source code for the current function or frame.
Interesting lines are marked as for "list".
New in version 3.2.
a(rgs)
Print the argument list of the current function.
p expression
Evaluate the *expression* in the current context and print its
value.
Note:
"print()" can also be used, but is not a debugger command — this
executes the Python "print()" function.
pp expression
Like the "p" command, except the value of the expression is pretty-
printed using the "pprint" module.
whatis expression
Print the type of the *expression*.
source expression
Try to get source code for the given object and display it.
New in version 3.2.
display [expression]
Display the value of the expression if it changed, each time
execution stops in the current frame.
Without expression, list all display expressions for the current
frame.
New in version 3.2.
undisplay [expression]
Do not display the expression any more in the current frame.
Without expression, clear all display expressions for the current
frame.
New in version 3.2.
interact
Start an interactive interpreter (using the "code" module) whose
global namespace contains all the (global and local) names found in
the current scope.
New in version 3.2.
alias [name [command]]
Create an alias called *name* that executes *command*. The command
must *not* be enclosed in quotes. Replaceable parameters can be
indicated by "%1", "%2", and so on, while "%*" is replaced by all
the parameters. If no command is given, the current alias for
*name* is shown. If no arguments are given, all aliases are listed.
Aliases may be nested and can contain anything that can be legally
typed at the pdb prompt. Note that internal pdb commands *can* be
overridden by aliases. Such a command is then hidden until the
alias is removed. Aliasing is recursively applied to the first
word of the command line; all other words in the line are left
alone.
As an example, here are two useful aliases (especially when placed
in the ".pdbrc" file):
# Print instance variables (usage "pi classInst")
alias pi for k in %1.__dict__.keys(): print("%1.",k,"=",%1.__dict__[k])
# Print instance variables in self
alias ps pi self
unalias name
Delete the specified alias.
! statement
Execute the (one-line) *statement* in the context of the current
stack frame. The exclamation point can be omitted unless the first
word of the statement resembles a debugger command. To set a
global variable, you can prefix the assignment command with a
"global" statement on the same line, e.g.:
(Pdb) global list_options; list_options = ['-l']
(Pdb)
run [args ...]
restart [args ...]
Restart the debugged Python program. If an argument is supplied,
it is split with "shlex" and the result is used as the new
"sys.argv". History, breakpoints, actions and debugger options are
preserved. "restart" is an alias for "run".
q(uit)
Quit from the debugger. The program being executed is aborted.
debug code
Enter a recursive debugger that steps through the code argument
(which is an arbitrary expression or statement to be executed in
the current environment).
retval
Print the return value for the last return of a function.
-[ Footnotes ]-
[1] Whether a frame is considered to originate in a certain module is
determined by the "__name__" in the frame globals.
a� The "del" statement
*******************
del_stmt ::= "del" target_list
Deletion is recursively defined very similar to the way assignment is
defined. Rather than spelling it out in full details, here are some
hints.
Deletion of a target list recursively deletes each target, from left
to right.
Deletion of a name removes the binding of that name from the local or
global namespace, depending on whether the name occurs in a "global"
statement in the same code block. If the name is unbound, a
"NameError" exception will be raised.
Deletion of attribute references, subscriptions and slicings is passed
to the primary object involved; deletion of a slicing is in general
equivalent to assignment of an empty slice of the right type (but even
this is determined by the sliced object).
Changed in version 3.2: Previously it was illegal to delete a name
from the local namespace if it occurs as a free variable in a nested
block.
u Dictionary displays
*******************
A dictionary display is a possibly empty series of key/datum pairs
enclosed in curly braces:
dict_display ::= "{" [key_datum_list | dict_comprehension] "}"
key_datum_list ::= key_datum ("," key_datum)* [","]
key_datum ::= expression ":" expression | "**" or_expr
dict_comprehension ::= expression ":" expression comp_for
A dictionary display yields a new dictionary object.
If a comma-separated sequence of key/datum pairs is given, they are
evaluated from left to right to define the entries of the dictionary:
each key object is used as a key into the dictionary to store the
corresponding datum. This means that you can specify the same key
multiple times in the key/datum list, and the final dictionary’s value
for that key will be the last one given.
A double asterisk "**" denotes *dictionary unpacking*. Its operand
must be a *mapping*. Each mapping item is added to the new
dictionary. Later values replace values already set by earlier
key/datum pairs and earlier dictionary unpackings.
New in version 3.5: Unpacking into dictionary displays, originally
proposed by **PEP 448**.
A dict comprehension, in contrast to list and set comprehensions,
needs two expressions separated with a colon followed by the usual
“for” and “if” clauses. When the comprehension is run, the resulting
key and value elements are inserted in the new dictionary in the order
they are produced.
Restrictions on the types of the key values are listed earlier in
section The standard type hierarchy. (To summarize, the key type
should be *hashable*, which excludes all mutable objects.) Clashes
between duplicate keys are not detected; the last datum (textually
rightmost in the display) stored for a given key value prevails.
Changed in version 3.8: Prior to Python 3.8, in dict comprehensions,
the evaluation order of key and value was not well-defined. In
CPython, the value was evaluated before the key. Starting with 3.8,
the key is evaluated before the value, as proposed by **PEP 572**.
a� Interaction with dynamic features
*********************************
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
aX The "if" statement
******************
The "if" statement is used for conditional execution:
if_stmt ::= "if" assignment_expression ":" suite
("elif" assignment_expression ":" suite)*
["else" ":" suite]
It selects exactly one of the suites by evaluating the expressions one
by one until one is found to be true (see section Boolean operations
for the definition of true and false); then that suite is executed
(and no other part of the "if" statement is executed or evaluated).
If all expressions are false, the suite of the "else" clause, if
present, is executed.
u� Exceptions
**********
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is *raised* at the point where the error is
detected; it may be *handled* by the surrounding code block or by any
code block that directly or indirectly invoked the code block where
the error occurred.
The Python interpreter raises an exception when it detects a run-time
error (such as division by zero). A Python program can also
explicitly raise an exception with the "raise" statement. Exception
handlers are specified with the "try" … "except" statement. The
"finally" clause of such a statement can be used to specify cleanup
code which does not handle the exception, but is executed whether an
exception occurred or not in the preceding code.
Python uses the “termination” model of error handling: an exception
handler can find out what happened and continue execution at an outer
level, but it cannot repair the cause of the error and retry the
failing operation (except by re-entering the offending piece of code
from the top).
When an exception is not handled at all, the interpreter terminates
execution of the program, or returns to its interactive main loop. In
either case, it prints a stack traceback, except when the exception is
"SystemExit".
Exceptions are identified by class instances. The "except" clause is
selected depending on the class of the instance: it must reference the
class of the instance or a base class thereof. The instance can be
received by the handler and can carry additional information about the
exceptional condition.
Note:
Exception messages are not part of the Python API. Their contents
may change from one version of Python to the next without warning
and should not be relied on by code which will run under multiple
versions of the interpreter.
See also the description of the "try" statement in section The try
statement and "raise" statement in section The raise statement.
-[ Footnotes ]-
[1] This limitation occurs because the code that is executed by these
operations is not available at the time the module is compiled.
u$ Execution model
***************
Structure of a program
======================
A Python program is constructed from code blocks. A *block* is a piece
of Python program text that is executed as a unit. The following are
blocks: a module, a function body, and a class definition. Each
command typed interactively is a block. A script file (a file given
as standard input to the interpreter or specified as a command line
argument to the interpreter) is a code block. A script command (a
command specified on the interpreter command line with the "-c"
option) is a code block. The string argument passed to the built-in
functions "eval()" and "exec()" is a code block.
A code block is executed in an *execution frame*. A frame contains
some administrative information (used for debugging) and determines
where and how execution continues after the code block’s execution has
completed.
Naming and binding
==================
Binding of names
----------------
*Names* refer to objects. Names are introduced by name binding
operations.
The following constructs bind names: formal parameters to functions,
"import" statements, class and function definitions (these bind the
class or function name in the defining block), and targets that are
identifiers if occurring in an assignment, "for" loop header, or after
"as" in a "with" statement or "except" clause. The "import" statement
of the form "from ... import *" binds all names defined in the
imported module, except those beginning with an underscore. This form
may only be used at the module level.
A target occurring in a "del" statement is also considered bound for
this purpose (though the actual semantics are to unbind the name).
Each assignment or import statement occurs within a block defined by a
class or function definition or at the module level (the top-level
code block).
If a name is bound in a block, it is a local variable of that block,
unless declared as "nonlocal" or "global". If a name is bound at the
module level, it is a global variable. (The variables of the module
code block are local and global.) If a variable is used in a code
block but not defined there, it is a *free variable*.
Each occurrence of a name in the program text refers to the *binding*
of that name established by the following name resolution rules.
Resolution of names
-------------------
A *scope* defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. If the
definition occurs in a function block, the scope extends to any blocks
contained within the defining one, unless a contained block introduces
a different binding for the name.
When a name is used in a code block, it is resolved using the nearest
enclosing scope. The set of all such scopes visible to a code block
is called the block’s *environment*.
When a name is not found at all, a "NameError" exception is raised. If
the current scope is a function scope, and the name refers to a local
variable that has not yet been bound to a value at the point where the
name is used, an "UnboundLocalError" exception is raised.
"UnboundLocalError" is a subclass of "NameError".
If a name binding operation occurs anywhere within a code block, all
uses of the name within the block are treated as references to the
current block. This can lead to errors when a name is used within a
block before it is bound. This rule is subtle. Python lacks
declarations and allows name binding operations to occur anywhere
within a code block. The local variables of a code block can be
determined by scanning the entire text of the block for name binding
operations.
If the "global" statement occurs within a block, all uses of the name
specified in the statement refer to the binding of that name in the
top-level namespace. Names are resolved in the top-level namespace by
searching the global namespace, i.e. the namespace of the module
containing the code block, and the builtins namespace, the namespace
of the module "builtins". The global namespace is searched first. If
the name is not found there, the builtins namespace is searched. The
"global" statement must precede all uses of the name.
The "global" statement has the same scope as a name binding operation
in the same block. If the nearest enclosing scope for a free variable
contains a global statement, the free variable is treated as a global.
The "nonlocal" statement causes corresponding names to refer to
previously bound variables in the nearest enclosing function scope.
"SyntaxError" is raised at compile time if the given name does not
exist in any enclosing function scope.
The namespace for a module is automatically created the first time a
module is imported. The main module for a script is always called
"__main__".
Class definition blocks and arguments to "exec()" and "eval()" are
special in the context of name resolution. A class definition is an
executable statement that may use and define names. These references
follow the normal rules for name resolution with an exception that
unbound local variables are looked up in the global namespace. The
namespace of the class definition becomes the attribute dictionary of
the class. The scope of names defined in a class block is limited to
the class block; it does not extend to the code blocks of methods –
this includes comprehensions and generator expressions since they are
implemented using a function scope. This means that the following
will fail:
class A:
a = 42
b = list(a + i for i in range(10))
Builtins and restricted execution
---------------------------------
**CPython implementation detail:** Users should not touch
"__builtins__"; it is strictly an implementation detail. Users
wanting to override values in the builtins namespace should "import"
the "builtins" module and modify its attributes appropriately.
The builtins namespace associated with the execution of a code block
is actually found by looking up the name "__builtins__" in its global
namespace; this should be a dictionary or a module (in the latter case
the module’s dictionary is used). By default, when in the "__main__"
module, "__builtins__" is the built-in module "builtins"; when in any
other module, "__builtins__" is an alias for the dictionary of the
"builtins" module itself.
Interaction with dynamic features
---------------------------------
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
Exceptions
==========
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is *raised* at the point where the error is
detected; it may be *handled* by the surrounding code block or by any
code block that directly or indirectly invoked the code block where
the error occurred.
The Python interpreter raises an exception when it detects a run-time
error (such as division by zero). A Python program can also
explicitly raise an exception with the "raise" statement. Exception
handlers are specified with the "try" … "except" statement. The
"finally" clause of such a statement can be used to specify cleanup
code which does not handle the exception, but is executed whether an
exception occurred or not in the preceding code.
Python uses the “termination” model of error handling: an exception
handler can find out what happened and continue execution at an outer
level, but it cannot repair the cause of the error and retry the
failing operation (except by re-entering the offending piece of code
from the top).
When an exception is not handled at all, the interpreter terminates
execution of the program, or returns to its interactive main loop. In
either case, it prints a stack traceback, except when the exception is
"SystemExit".
Exceptions are identified by class instances. The "except" clause is
selected depending on the class of the instance: it must reference the
class of the instance or a base class thereof. The instance can be
received by the handler and can carry additional information about the
exceptional condition.
Note:
Exception messages are not part of the Python API. Their contents
may change from one version of Python to the next without warning
and should not be relied on by code which will run under multiple
versions of the interpreter.
See also the description of the "try" statement in section The try
statement and "raise" statement in section The raise statement.
-[ Footnotes ]-
[1] This limitation occurs because the code that is executed by these
operations is not available at the time the module is compiled.
uz Expression lists
****************
expression_list ::= expression ("," expression)* [","]
starred_list ::= starred_item ("," starred_item)* [","]
starred_expression ::= expression | (starred_item ",")* [starred_item]
starred_item ::= assignment_expression | "*" or_expr
Except when part of a list or set display, an expression list
containing at least one comma yields a tuple. The length of the tuple
is the number of expressions in the list. The expressions are
evaluated from left to right.
An asterisk "*" denotes *iterable unpacking*. Its operand must be an
*iterable*. The iterable is expanded into a sequence of items, which
are included in the new tuple, list, or set, at the site of the
unpacking.
New in version 3.5: Iterable unpacking in expression lists, originally
proposed by **PEP 448**.
The trailing comma is required only to create a single tuple (a.k.a. a
*singleton*); it is optional in all other cases. A single expression
without a trailing comma doesn’t create a tuple, but rather yields the
value of that expression. (To create an empty tuple, use an empty pair
of parentheses: "()".)
a� Floating point literals
***********************
Floating point literals are described by the following lexical
definitions:
floatnumber ::= pointfloat | exponentfloat
pointfloat ::= [digitpart] fraction | digitpart "."
exponentfloat ::= (digitpart | pointfloat) exponent
digitpart ::= digit (["_"] digit)*
fraction ::= "." digitpart
exponent ::= ("e" | "E") ["+" | "-"] digitpart
Note that the integer and exponent parts are always interpreted using
radix 10. For example, "077e010" is legal, and denotes the same number
as "77e10". The allowed range of floating point literals is
implementation-dependent. As in integer literals, underscores are
supported for digit grouping.
Some examples of floating point literals:
3.14 10. .001 1e100 3.14e-10 0e0 3.14_15_93
Changed in version 3.6: Underscores are now allowed for grouping
purposes in literals.
u�
The "for" statement
*******************
The "for" statement is used to iterate over the elements of a sequence
(such as a string, tuple or list) or other iterable object:
for_stmt ::= "for" target_list "in" expression_list ":" suite
["else" ":" suite]
The expression list is evaluated once; it should yield an iterable
object. An iterator is created for the result of the
"expression_list". The suite is then executed once for each item
provided by the iterator, in the order returned by the iterator. Each
item in turn is assigned to the target list using the standard rules
for assignments (see Assignment statements), and then the suite is
executed. When the items are exhausted (which is immediately when the
sequence is empty or an iterator raises a "StopIteration" exception),
the suite in the "else" clause, if present, is executed, and the loop
terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and continues
with the next item, or with the "else" clause if there is no next
item.
The for-loop makes assignments to the variables in the target list.
This overwrites all previous assignments to those variables including
those made in the suite of the for-loop:
for i in range(10):
print(i)
i = 5 # this will not affect the for-loop
# because i will be overwritten with the next
# index in the range
Names in the target list are not deleted when the loop is finished,
but if the sequence is empty, they will not have been assigned to at
all by the loop. Hint: the built-in function "range()" returns an
iterator of integers suitable to emulate the effect of Pascal’s "for i
:= a to b do"; e.g., "list(range(3))" returns the list "[0, 1, 2]".
Note:
There is a subtlety when the sequence is being modified by the loop
(this can only occur for mutable sequences, e.g. lists). An
internal counter is used to keep track of which item is used next,
and this is incremented on each iteration. When this counter has
reached the length of the sequence the loop terminates. This means
that if the suite deletes the current (or a previous) item from the
sequence, the next item will be skipped (since it gets the index of
the current item which has already been treated). Likewise, if the
suite inserts an item in the sequence before the current item, the
current item will be treated again the next time through the loop.
This can lead to nasty bugs that can be avoided by making a
temporary copy using a slice of the whole sequence, e.g.,
for x in a[:]:
if x < 0: a.remove(x)
u�` Format String Syntax
********************
The "str.format()" method and the "Formatter" class share the same
syntax for format strings (although in the case of "Formatter",
subclasses can define their own format string syntax). The syntax is
related to that of formatted string literals, but it is less
sophisticated and, in particular, does not support arbitrary
expressions.
Format strings contain “replacement fields” surrounded by curly braces
"{}". Anything that is not contained in braces is considered literal
text, which is copied unchanged to the output. If you need to include
a brace character in the literal text, it can be escaped by doubling:
"{{" and "}}".
The grammar for a replacement field is as follows:
replacement_field ::= "{" [field_name] ["!" conversion] [":" format_spec] "}"
field_name ::= arg_name ("." attribute_name | "[" element_index "]")*
arg_name ::= [identifier | digit+]
attribute_name ::= identifier
element_index ::= digit+ | index_string
index_string ::= <any source character except "]"> +
conversion ::= "r" | "s" | "a"
format_spec ::= <described in the next section>
In less formal terms, the replacement field can start with a
*field_name* that specifies the object whose value is to be formatted
and inserted into the output instead of the replacement field. The
*field_name* is optionally followed by a *conversion* field, which is
preceded by an exclamation point "'!'", and a *format_spec*, which is
preceded by a colon "':'". These specify a non-default format for the
replacement value.
See also the Format Specification Mini-Language section.
The *field_name* itself begins with an *arg_name* that is either a
number or a keyword. If it’s a number, it refers to a positional
argument, and if it’s a keyword, it refers to a named keyword
argument. If the numerical arg_names in a format string are 0, 1, 2,
… in sequence, they can all be omitted (not just some) and the numbers
0, 1, 2, … will be automatically inserted in that order. Because
*arg_name* is not quote-delimited, it is not possible to specify
arbitrary dictionary keys (e.g., the strings "'10'" or "':-]'") within
a format string. The *arg_name* can be followed by any number of index
or attribute expressions. An expression of the form "'.name'" selects
the named attribute using "getattr()", while an expression of the form
"'[index]'" does an index lookup using "__getitem__()".
Changed in version 3.1: The positional argument specifiers can be
omitted for "str.format()", so "'{} {}'.format(a, b)" is equivalent to
"'{0} {1}'.format(a, b)".
Changed in version 3.4: The positional argument specifiers can be
omitted for "Formatter".
Some simple format string examples:
"First, thou shalt count to {0}" # References first positional argument
"Bring me a {}" # Implicitly references the first positional argument
"From {} to {}" # Same as "From {0} to {1}"
"My quest is {name}" # References keyword argument 'name'
"Weight in tons {0.weight}" # 'weight' attribute of first positional arg
"Units destroyed: {players[0]}" # First element of keyword argument 'players'.
The *conversion* field causes a type coercion before formatting.
Normally, the job of formatting a value is done by the "__format__()"
method of the value itself. However, in some cases it is desirable to
force a type to be formatted as a string, overriding its own
definition of formatting. By converting the value to a string before
calling "__format__()", the normal formatting logic is bypassed.
Three conversion flags are currently supported: "'!s'" which calls
"str()" on the value, "'!r'" which calls "repr()" and "'!a'" which
calls "ascii()".
Some examples:
"Harold's a clever {0!s}" # Calls str() on the argument first
"Bring out the holy {name!r}" # Calls repr() on the argument first
"More {!a}" # Calls ascii() on the argument first
The *format_spec* field contains a specification of how the value
should be presented, including such details as field width, alignment,
padding, decimal precision and so on. Each value type can define its
own “formatting mini-language” or interpretation of the *format_spec*.
Most built-in types support a common formatting mini-language, which
is described in the next section.
A *format_spec* field can also include nested replacement fields
within it. These nested replacement fields may contain a field name,
conversion flag and format specification, but deeper nesting is not
allowed. The replacement fields within the format_spec are
substituted before the *format_spec* string is interpreted. This
allows the formatting of a value to be dynamically specified.
See the Format examples section for some examples.
Format Specification Mini-Language
==================================
“Format specifications” are used within replacement fields contained
within a format string to define how individual values are presented
(see Format String Syntax and Formatted string literals). They can
also be passed directly to the built-in "format()" function. Each
formattable type may define how the format specification is to be
interpreted.
Most built-in types implement the following options for format
specifications, although some of the formatting options are only
supported by the numeric types.
A general convention is that an empty format specification produces
the same result as if you had called "str()" on the value. A non-empty
format specification typically modifies the result.
The general form of a *standard format specifier* is:
format_spec ::= [[fill]align][sign][#][0][width][grouping_option][.precision][type]
fill ::= <any character>
align ::= "<" | ">" | "=" | "^"
sign ::= "+" | "-" | " "
width ::= digit+
grouping_option ::= "_" | ","
precision ::= digit+
type ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%"
If a valid *align* value is specified, it can be preceded by a *fill*
character that can be any character and defaults to a space if
omitted. It is not possible to use a literal curly brace (”"{"” or
“"}"”) as the *fill* character in a formatted string literal or when
using the "str.format()" method. However, it is possible to insert a
curly brace with a nested replacement field. This limitation doesn’t
affect the "format()" function.
The meaning of the various alignment options is as follows:
+-----------+------------------------------------------------------------+
| Option | Meaning |
|===========|============================================================|
| "'<'" | Forces the field to be left-aligned within the available |
| | space (this is the default for most objects). |
+-----------+------------------------------------------------------------+
| "'>'" | Forces the field to be right-aligned within the available |
| | space (this is the default for numbers). |
+-----------+------------------------------------------------------------+
| "'='" | Forces the padding to be placed after the sign (if any) |
| | but before the digits. This is used for printing fields |
| | in the form ‘+000000120’. This alignment option is only |
| | valid for numeric types. It becomes the default when ‘0’ |
| | immediately precedes the field width. |
+-----------+------------------------------------------------------------+
| "'^'" | Forces the field to be centered within the available |
| | space. |
+-----------+------------------------------------------------------------+
Note that unless a minimum field width is defined, the field width
will always be the same size as the data to fill it, so that the
alignment option has no meaning in this case.
The *sign* option is only valid for number types, and can be one of
the following:
+-----------+------------------------------------------------------------+
| Option | Meaning |
|===========|============================================================|
| "'+'" | indicates that a sign should be used for both positive as |
| | well as negative numbers. |
+-----------+------------------------------------------------------------+
| "'-'" | indicates that a sign should be used only for negative |
| | numbers (this is the default behavior). |
+-----------+------------------------------------------------------------+
| space | indicates that a leading space should be used on positive |
| | numbers, and a minus sign on negative numbers. |
+-----------+------------------------------------------------------------+
The "'#'" option causes the “alternate form” to be used for the
conversion. The alternate form is defined differently for different
types. This option is only valid for integer, float and complex
types. For integers, when binary, octal, or hexadecimal output is
used, this option adds the prefix respective "'0b'", "'0o'", or "'0x'"
to the output value. For float and complex the alternate form causes
the result of the conversion to always contain a decimal-point
character, even if no digits follow it. Normally, a decimal-point
character appears in the result of these conversions only if a digit
follows it. In addition, for "'g'" and "'G'" conversions, trailing
zeros are not removed from the result.
The "','" option signals the use of a comma for a thousands separator.
For a locale aware separator, use the "'n'" integer presentation type
instead.
Changed in version 3.1: Added the "','" option (see also **PEP 378**).
The "'_'" option signals the use of an underscore for a thousands
separator for floating point presentation types and for integer
presentation type "'d'". For integer presentation types "'b'", "'o'",
"'x'", and "'X'", underscores will be inserted every 4 digits. For
other presentation types, specifying this option is an error.
Changed in version 3.6: Added the "'_'" option (see also **PEP 515**).
*width* is a decimal integer defining the minimum total field width,
including any prefixes, separators, and other formatting characters.
If not specified, then the field width will be determined by the
content.
When no explicit alignment is given, preceding the *width* field by a
zero ("'0'") character enables sign-aware zero-padding for numeric
types. This is equivalent to a *fill* character of "'0'" with an
*alignment* type of "'='".
The *precision* is a decimal number indicating how many digits should
be displayed after the decimal point for a floating point value
formatted with "'f'" and "'F'", or before and after the decimal point
for a floating point value formatted with "'g'" or "'G'". For non-
number types the field indicates the maximum field size - in other
words, how many characters will be used from the field content. The
*precision* is not allowed for integer values.
Finally, the *type* determines how the data should be presented.
The available string presentation types are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'s'" | String format. This is the default type for strings and |
| | may be omitted. |
+-----------+------------------------------------------------------------+
| None | The same as "'s'". |
+-----------+------------------------------------------------------------+
The available integer presentation types are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'b'" | Binary format. Outputs the number in base 2. |
+-----------+------------------------------------------------------------+
| "'c'" | Character. Converts the integer to the corresponding |
| | unicode character before printing. |
+-----------+------------------------------------------------------------+
| "'d'" | Decimal Integer. Outputs the number in base 10. |
+-----------+------------------------------------------------------------+
| "'o'" | Octal format. Outputs the number in base 8. |
+-----------+------------------------------------------------------------+
| "'x'" | Hex format. Outputs the number in base 16, using lower- |
| | case letters for the digits above 9. |
+-----------+------------------------------------------------------------+
| "'X'" | Hex format. Outputs the number in base 16, using upper- |
| | case letters for the digits above 9. |
+-----------+------------------------------------------------------------+
| "'n'" | Number. This is the same as "'d'", except that it uses the |
| | current locale setting to insert the appropriate number |
| | separator characters. |
+-----------+------------------------------------------------------------+
| None | The same as "'d'". |
+-----------+------------------------------------------------------------+
In addition to the above presentation types, integers can be formatted
with the floating point presentation types listed below (except "'n'"
and "None"). When doing so, "float()" is used to convert the integer
to a floating point number before formatting.
The available presentation types for "float" and "Decimal" values are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'e'" | Scientific notation. For a given precision "p", formats |
| | the number in scientific notation with the letter ‘e’ |
| | separating the coefficient from the exponent. The |
| | coefficient has one digit before and "p" digits after the |
| | decimal point, for a total of "p + 1" significant digits. |
| | With no precision given, uses a precision of "6" digits |
| | after the decimal point for "float", and shows all |
| | coefficient digits for "Decimal". If no digits follow the |
| | decimal point, the decimal point is also removed unless |
| | the "#" option is used. |
+-----------+------------------------------------------------------------+
| "'E'" | Scientific notation. Same as "'e'" except it uses an upper |
| | case ‘E’ as the separator character. |
+-----------+------------------------------------------------------------+
| "'f'" | Fixed-point notation. For a given precision "p", formats |
| | the number as a decimal number with exactly "p" digits |
| | following the decimal point. With no precision given, uses |
| | a precision of "6" digits after the decimal point for |
| | "float", and uses a precision large enough to show all |
| | coefficient digits for "Decimal". If no digits follow the |
| | decimal point, the decimal point is also removed unless |
| | the "#" option is used. |
+-----------+------------------------------------------------------------+
| "'F'" | Fixed-point notation. Same as "'f'", but converts "nan" to |
| | "NAN" and "inf" to "INF". |
+-----------+------------------------------------------------------------+
| "'g'" | General format. For a given precision "p >= 1", this |
| | rounds the number to "p" significant digits and then |
| | formats the result in either fixed-point format or in |
| | scientific notation, depending on its magnitude. A |
| | precision of "0" is treated as equivalent to a precision |
| | of "1". The precise rules are as follows: suppose that |
| | the result formatted with presentation type "'e'" and |
| | precision "p-1" would have exponent "exp". Then, if "m <= |
| | exp < p", where "m" is -4 for floats and -6 for |
| | "Decimals", the number is formatted with presentation type |
| | "'f'" and precision "p-1-exp". Otherwise, the number is |
| | formatted with presentation type "'e'" and precision |
| | "p-1". In both cases insignificant trailing zeros are |
| | removed from the significand, and the decimal point is |
| | also removed if there are no remaining digits following |
| | it, unless the "'#'" option is used. With no precision |
| | given, uses a precision of "6" significant digits for |
| | "float". For "Decimal", the coefficient of the result is |
| | formed from the coefficient digits of the value; |
| | scientific notation is used for values smaller than "1e-6" |
| | in absolute value and values where the place value of the |
| | least significant digit is larger than 1, and fixed-point |
| | notation is used otherwise. Positive and negative |
| | infinity, positive and negative zero, and nans, are |
| | formatted as "inf", "-inf", "0", "-0" and "nan" |
| | respectively, regardless of the precision. |
+-----------+------------------------------------------------------------+
| "'G'" | General format. Same as "'g'" except switches to "'E'" if |
| | the number gets too large. The representations of infinity |
| | and NaN are uppercased, too. |
+-----------+------------------------------------------------------------+
| "'n'" | Number. This is the same as "'g'", except that it uses the |
| | current locale setting to insert the appropriate number |
| | separator characters. |
+-----------+------------------------------------------------------------+
| "'%'" | Percentage. Multiplies the number by 100 and displays in |
| | fixed ("'f'") format, followed by a percent sign. |
+-----------+------------------------------------------------------------+
| None | For "float" this is the same as "'g'", except that when |
| | fixed-point notation is used to format the result, it |
| | always includes at least one digit past the decimal point. |
| | The precision used is as large as needed to represent the |
| | given value faithfully. For "Decimal", this is the same |
| | as either "'g'" or "'G'" depending on the value of |
| | "context.capitals" for the current decimal context. The |
| | overall effect is to match the output of "str()" as |
| | altered by the other format modifiers. |
+-----------+------------------------------------------------------------+
Format examples
===============
This section contains examples of the "str.format()" syntax and
comparison with the old "%"-formatting.
In most of the cases the syntax is similar to the old "%"-formatting,
with the addition of the "{}" and with ":" used instead of "%". For
example, "'%03.2f'" can be translated to "'{:03.2f}'".
The new format syntax also supports new and different options, shown
in the following examples.
Accessing arguments by position:
>>> '{0}, {1}, {2}'.format('a', 'b', 'c')
'a, b, c'
>>> '{}, {}, {}'.format('a', 'b', 'c') # 3.1+ only
'a, b, c'
>>> '{2}, {1}, {0}'.format('a', 'b', 'c')
'c, b, a'
>>> '{2}, {1}, {0}'.format(*'abc') # unpacking argument sequence
'c, b, a'
>>> '{0}{1}{0}'.format('abra', 'cad') # arguments' indices can be repeated
'abracadabra'
Accessing arguments by name:
>>> 'Coordinates: {latitude}, {longitude}'.format(latitude='37.24N', longitude='-115.81W')
'Coordinates: 37.24N, -115.81W'
>>> coord = {'latitude': '37.24N', 'longitude': '-115.81W'}
>>> 'Coordinates: {latitude}, {longitude}'.format(**coord)
'Coordinates: 37.24N, -115.81W'
Accessing arguments’ attributes:
>>> c = 3-5j
>>> ('The complex number {0} is formed from the real part {0.real} '
... 'and the imaginary part {0.imag}.').format(c)
'The complex number (3-5j) is formed from the real part 3.0 and the imaginary part -5.0.'
>>> class Point:
... def __init__(self, x, y):
... self.x, self.y = x, y
... def __str__(self):
... return 'Point({self.x}, {self.y})'.format(self=self)
...
>>> str(Point(4, 2))
'Point(4, 2)'
Accessing arguments’ items:
>>> coord = (3, 5)
>>> 'X: {0[0]}; Y: {0[1]}'.format(coord)
'X: 3; Y: 5'
Replacing "%s" and "%r":
>>> "repr() shows quotes: {!r}; str() doesn't: {!s}".format('test1', 'test2')
"repr() shows quotes: 'test1'; str() doesn't: test2"
Aligning the text and specifying a width:
>>> '{:<30}'.format('left aligned')
'left aligned '
>>> '{:>30}'.format('right aligned')
' right aligned'
>>> '{:^30}'.format('centered')
' centered '
>>> '{:*^30}'.format('centered') # use '*' as a fill char
'***********centered***********'
Replacing "%+f", "%-f", and "% f" and specifying a sign:
>>> '{:+f}; {:+f}'.format(3.14, -3.14) # show it always
'+3.140000; -3.140000'
>>> '{: f}; {: f}'.format(3.14, -3.14) # show a space for positive numbers
' 3.140000; -3.140000'
>>> '{:-f}; {:-f}'.format(3.14, -3.14) # show only the minus -- same as '{:f}; {:f}'
'3.140000; -3.140000'
Replacing "%x" and "%o" and converting the value to different bases:
>>> # format also supports binary numbers
>>> "int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}".format(42)
'int: 42; hex: 2a; oct: 52; bin: 101010'
>>> # with 0x, 0o, or 0b as prefix:
>>> "int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}".format(42)
'int: 42; hex: 0x2a; oct: 0o52; bin: 0b101010'
Using the comma as a thousands separator:
>>> '{:,}'.format(1234567890)
'1,234,567,890'
Expressing a percentage:
>>> points = 19
>>> total = 22
>>> 'Correct answers: {:.2%}'.format(points/total)
'Correct answers: 86.36%'
Using type-specific formatting:
>>> import datetime
>>> d = datetime.datetime(2010, 7, 4, 12, 15, 58)
>>> '{:%Y-%m-%d %H:%M:%S}'.format(d)
'2010-07-04 12:15:58'
Nesting arguments and more complex examples:
>>> for align, text in zip('<^>', ['left', 'center', 'right']):
... '{0:{fill}{align}16}'.format(text, fill=align, align=align)
...
'left<<<<<<<<<<<<'
'^^^^^center^^^^^'
'>>>>>>>>>>>right'
>>>
>>> octets = [192, 168, 0, 1]
>>> '{:02X}{:02X}{:02X}{:02X}'.format(*octets)
'C0A80001'
>>> int(_, 16)
3232235521
>>>
>>> width = 5
>>> for num in range(5,12):
... for base in 'dXob':
... print('{0:{width}{base}}'.format(num, base=base, width=width), end=' ')
... print()
...
5 5 5 101
6 6 6 110
7 7 7 111
8 8 10 1000
9 9 11 1001
10 A 12 1010
11 B 13 1011
u| Function definitions
********************
A function definition defines a user-defined function object (see
section The standard type hierarchy):
funcdef ::= [decorators] "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
decorators ::= decorator+
decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name ::= identifier ("." identifier)*
parameter_list ::= defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]]
| parameter_list_no_posonly
parameter_list_no_posonly ::= defparameter ("," defparameter)* ["," [parameter_list_starargs]]
| parameter_list_starargs
parameter_list_starargs ::= "*" [parameter] ("," defparameter)* ["," ["**" parameter [","]]]
| "**" parameter [","]
parameter ::= identifier [":" expression]
defparameter ::= parameter ["=" expression]
funcname ::= identifier
A function definition is an executable statement. Its execution binds
the function name in the current local namespace to a function object
(a wrapper around the executable code for the function). This
function object contains a reference to the current global namespace
as the global namespace to be used when the function is called.
The function definition does not execute the function body; this gets
executed only when the function is called. [2]
A function definition may be wrapped by one or more *decorator*
expressions. Decorator expressions are evaluated when the function is
defined, in the scope that contains the function definition. The
result must be a callable, which is invoked with the function object
as the only argument. The returned value is bound to the function name
instead of the function object. Multiple decorators are applied in
nested fashion. For example, the following code
@f1(arg)
@f2
def func(): pass
is roughly equivalent to
def func(): pass
func = f1(arg)(f2(func))
except that the original function is not temporarily bound to the name
"func".
When one or more *parameters* have the form *parameter* "="
*expression*, the function is said to have “default parameter values.”
For a parameter with a default value, the corresponding *argument* may
be omitted from a call, in which case the parameter’s default value is
substituted. If a parameter has a default value, all following
parameters up until the “"*"” must also have a default value — this is
a syntactic restriction that is not expressed by the grammar.
**Default parameter values are evaluated from left to right when the
function definition is executed.** This means that the expression is
evaluated once, when the function is defined, and that the same “pre-
computed” value is used for each call. This is especially important
to understand when a default parameter is a mutable object, such as a
list or a dictionary: if the function modifies the object (e.g. by
appending an item to a list), the default value is in effect modified.
This is generally not what was intended. A way around this is to use
"None" as the default, and explicitly test for it in the body of the
function, e.g.:
def whats_on_the_telly(penguin=None):
if penguin is None:
penguin = []
penguin.append("property of the zoo")
return penguin
Function call semantics are described in more detail in section Calls.
A function call always assigns values to all parameters mentioned in
the parameter list, either from positional arguments, from keyword
arguments, or from default values. If the form “"*identifier"” is
present, it is initialized to a tuple receiving any excess positional
parameters, defaulting to the empty tuple. If the form
“"**identifier"” is present, it is initialized to a new ordered
mapping receiving any excess keyword arguments, defaulting to a new
empty mapping of the same type. Parameters after “"*"” or
“"*identifier"” are keyword-only parameters and may only be passed by
keyword arguments. Parameters before “"/"” are positional-only
parameters and may only be passed by positional arguments.
Changed in version 3.8: The "/" function parameter syntax may be used
to indicate positional-only parameters. See **PEP 570** for details.
Parameters may have an *annotation* of the form “": expression"”
following the parameter name. Any parameter may have an annotation,
even those of the form "*identifier" or "**identifier". Functions may
have “return” annotation of the form “"-> expression"” after the
parameter list. These annotations can be any valid Python expression.
The presence of annotations does not change the semantics of a
function. The annotation values are available as values of a
dictionary keyed by the parameters’ names in the "__annotations__"
attribute of the function object. If the "annotations" import from
"__future__" is used, annotations are preserved as strings at runtime
which enables postponed evaluation. Otherwise, they are evaluated
when the function definition is executed. In this case annotations
may be evaluated in a different order than they appear in the source
code.
It is also possible to create anonymous functions (functions not bound
to a name), for immediate use in expressions. This uses lambda
expressions, described in section Lambdas. Note that the lambda
expression is merely a shorthand for a simplified function definition;
a function defined in a “"def"” statement can be passed around or
assigned to another name just like a function defined by a lambda
expression. The “"def"” form is actually more powerful since it
allows the execution of multiple statements and annotations.
**Programmer’s note:** Functions are first-class objects. A “"def"”
statement executed inside a function definition defines a local
function that can be returned or passed around. Free variables used
in the nested function can access the local variables of the function
containing the def. See section Naming and binding for details.
See also:
**PEP 3107** - Function Annotations
The original specification for function annotations.
**PEP 484** - Type Hints
Definition of a standard meaning for annotations: type hints.
**PEP 526** - Syntax for Variable Annotations
Ability to type hint variable declarations, including class
variables and instance variables
**PEP 563** - Postponed Evaluation of Annotations
Support for forward references within annotations by preserving
annotations in a string form at runtime instead of eager
evaluation.
u� The "global" statement
**********************
global_stmt ::= "global" identifier ("," identifier)*
The "global" statement is a declaration which holds for the entire
current code block. It means that the listed identifiers are to be
interpreted as globals. It would be impossible to assign to a global
variable without "global", although free variables may refer to
globals without being declared global.
Names listed in a "global" statement must not be used in the same code
block textually preceding that "global" statement.
Names listed in a "global" statement must not be defined as formal
parameters or in a "for" loop control target, "class" definition,
function definition, "import" statement, or variable annotation.
**CPython implementation detail:** The current implementation does not
enforce some of these restrictions, but programs should not abuse this
freedom, as future implementations may enforce them or silently change
the meaning of the program.
**Programmer’s note:** "global" is a directive to the parser. It
applies only to code parsed at the same time as the "global"
statement. In particular, a "global" statement contained in a string
or code object supplied to the built-in "exec()" function does not
affect the code block *containing* the function call, and code
contained in such a string is unaffected by "global" statements in the
code containing the function call. The same applies to the "eval()"
and "compile()" functions.
u� Reserved classes of identifiers
*******************************
Certain classes of identifiers (besides keywords) have special
meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
"_*"
Not imported by "from module import *". The special identifier "_"
is used in the interactive interpreter to store the result of the
last evaluation; it is stored in the "builtins" module. When not
in interactive mode, "_" has no special meaning and is not defined.
See section The import statement.
Note:
The name "_" is often used in conjunction with
internationalization; refer to the documentation for the
"gettext" module for more information on this convention.
"__*__"
System-defined names, informally known as “dunder” names. These
names are defined by the interpreter and its implementation
(including the standard library). Current system names are
discussed in the Special method names section and elsewhere. More
will likely be defined in future versions of Python. *Any* use of
"__*__" names, in any context, that does not follow explicitly
documented use, is subject to breakage without warning.
"__*"
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled form
to help avoid name clashes between “private” attributes of base and
derived classes. See section Identifiers (Names).
um Identifiers and keywords
************************
Identifiers (also referred to as *names*) are described by the
following lexical definitions.
The syntax of identifiers in Python is based on the Unicode standard
annex UAX-31, with elaboration and changes as defined below; see also
**PEP 3131** for further details.
Within the ASCII range (U+0001..U+007F), the valid characters for
identifiers are the same as in Python 2.x: the uppercase and lowercase
letters "A" through "Z", the underscore "_" and, except for the first
character, the digits "0" through "9".
Python 3.0 introduces additional characters from outside the ASCII
range (see **PEP 3131**). For these characters, the classification
uses the version of the Unicode Character Database as included in the
"unicodedata" module.
Identifiers are unlimited in length. Case is significant.
identifier ::= xid_start xid_continue*
id_start ::= <all characters in general categories Lu, Ll, Lt, Lm, Lo, Nl, the underscore, and characters with the Other_ID_Start property>
id_continue ::= <all characters in id_start, plus characters in the categories Mn, Mc, Nd, Pc and others with the Other_ID_Continue property>
xid_start ::= <all characters in id_start whose NFKC normalization is in "id_start xid_continue*">
xid_continue ::= <all characters in id_continue whose NFKC normalization is in "id_continue*">
The Unicode category codes mentioned above stand for:
* *Lu* - uppercase letters
* *Ll* - lowercase letters
* *Lt* - titlecase letters
* *Lm* - modifier letters
* *Lo* - other letters
* *Nl* - letter numbers
* *Mn* - nonspacing marks
* *Mc* - spacing combining marks
* *Nd* - decimal numbers
* *Pc* - connector punctuations
* *Other_ID_Start* - explicit list of characters in PropList.txt to
support backwards compatibility
* *Other_ID_Continue* - likewise
All identifiers are converted into the normal form NFKC while parsing;
comparison of identifiers is based on NFKC.
A non-normative HTML file listing all valid identifier characters for
Unicode 4.1 can be found at
https://www.unicode.org/Public/13.0.0/ucd/DerivedCoreProperties.txt
Keywords
========
The following identifiers are used as reserved words, or *keywords* of
the language, and cannot be used as ordinary identifiers. They must
be spelled exactly as written here:
False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield
Reserved classes of identifiers
===============================
Certain classes of identifiers (besides keywords) have special
meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
"_*"
Not imported by "from module import *". The special identifier "_"
is used in the interactive interpreter to store the result of the
last evaluation; it is stored in the "builtins" module. When not
in interactive mode, "_" has no special meaning and is not defined.
See section The import statement.
Note:
The name "_" is often used in conjunction with
internationalization; refer to the documentation for the
"gettext" module for more information on this convention.
"__*__"
System-defined names, informally known as “dunder” names. These
names are defined by the interpreter and its implementation
(including the standard library). Current system names are
discussed in the Special method names section and elsewhere. More
will likely be defined in future versions of Python. *Any* use of
"__*__" names, in any context, that does not follow explicitly
documented use, is subject to breakage without warning.
"__*"
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled form
to help avoid name clashes between “private” attributes of base and
derived classes. See section Identifiers (Names).
a5 Imaginary literals
******************
Imaginary literals are described by the following lexical definitions:
imagnumber ::= (floatnumber | digitpart) ("j" | "J")
An imaginary literal yields a complex number with a real part of 0.0.
Complex numbers are represented as a pair of floating point numbers
and have the same restrictions on their range. To create a complex
number with a nonzero real part, add a floating point number to it,
e.g., "(3+4j)". Some examples of imaginary literals:
3.14j 10.j 10j .001j 1e100j 3.14e-10j 3.14_15_93j
u8" The "import" statement
**********************
import_stmt ::= "import" module ["as" identifier] ("," module ["as" identifier])*
| "from" relative_module "import" identifier ["as" identifier]
("," identifier ["as" identifier])*
| "from" relative_module "import" "(" identifier ["as" identifier]
("," identifier ["as" identifier])* [","] ")"
| "from" module "import" "*"
module ::= (identifier ".")* identifier
relative_module ::= "."* module | "."+
The basic import statement (no "from" clause) is executed in two
steps:
1. find a module, loading and initializing it if necessary
2. define a name or names in the local namespace for the scope where
the "import" statement occurs.
When the statement contains multiple clauses (separated by commas) the
two steps are carried out separately for each clause, just as though
the clauses had been separated out into individual import statements.
The details of the first step, finding and loading modules are
described in greater detail in the section on the import system, which
also describes the various types of packages and modules that can be
imported, as well as all the hooks that can be used to customize the
import system. Note that failures in this step may indicate either
that the module could not be located, *or* that an error occurred
while initializing the module, which includes execution of the
module’s code.
If the requested module is retrieved successfully, it will be made
available in the local namespace in one of three ways:
* If the module name is followed by "as", then the name following "as"
is bound directly to the imported module.
* If no other name is specified, and the module being imported is a
top level module, the module’s name is bound in the local namespace
as a reference to the imported module
* If the module being imported is *not* a top level module, then the
name of the top level package that contains the module is bound in
the local namespace as a reference to the top level package. The
imported module must be accessed using its full qualified name
rather than directly
The "from" form uses a slightly more complex process:
1. find the module specified in the "from" clause, loading and
initializing it if necessary;
2. for each of the identifiers specified in the "import" clauses:
1. check if the imported module has an attribute by that name
2. if not, attempt to import a submodule with that name and then
check the imported module again for that attribute
3. if the attribute is not found, "ImportError" is raised.
4. otherwise, a reference to that value is stored in the local
namespace, using the name in the "as" clause if it is present,
otherwise using the attribute name
Examples:
import foo # foo imported and bound locally
import foo.bar.baz # foo.bar.baz imported, foo bound locally
import foo.bar.baz as fbb # foo.bar.baz imported and bound as fbb
from foo.bar import baz # foo.bar.baz imported and bound as baz
from foo import attr # foo imported and foo.attr bound as attr
If the list of identifiers is replaced by a star ("'*'"), all public
names defined in the module are bound in the local namespace for the
scope where the "import" statement occurs.
The *public names* defined by a module are determined by checking the
module’s namespace for a variable named "__all__"; if defined, it must
be a sequence of strings which are names defined or imported by that
module. The names given in "__all__" are all considered public and
are required to exist. If "__all__" is not defined, the set of public
names includes all names found in the module’s namespace which do not
begin with an underscore character ("'_'"). "__all__" should contain
the entire public API. It is intended to avoid accidentally exporting
items that are not part of the API (such as library modules which were
imported and used within the module).
The wild card form of import — "from module import *" — is only
allowed at the module level. Attempting to use it in class or
function definitions will raise a "SyntaxError".
When specifying what module to import you do not have to specify the
absolute name of the module. When a module or package is contained
within another package it is possible to make a relative import within
the same top package without having to mention the package name. By
using leading dots in the specified module or package after "from" you
can specify how high to traverse up the current package hierarchy
without specifying exact names. One leading dot means the current
package where the module making the import exists. Two dots means up
one package level. Three dots is up two levels, etc. So if you execute
"from . import mod" from a module in the "pkg" package then you will
end up importing "pkg.mod". If you execute "from ..subpkg2 import mod"
from within "pkg.subpkg1" you will import "pkg.subpkg2.mod". The
specification for relative imports is contained in the Package
Relative Imports section.
"importlib.import_module()" is provided to support applications that
determine dynamically the modules to be loaded.
Raises an auditing event "import" with arguments "module", "filename",
"sys.path", "sys.meta_path", "sys.path_hooks".
Future statements
=================
A *future statement* is a directive to the compiler that a particular
module should be compiled using syntax or semantics that will be
available in a specified future release of Python where the feature
becomes standard.
The future statement is intended to ease migration to future versions
of Python that introduce incompatible changes to the language. It
allows use of the new features on a per-module basis before the
release in which the feature becomes standard.
future_stmt ::= "from" "__future__" "import" feature ["as" identifier]
("," feature ["as" identifier])*
| "from" "__future__" "import" "(" feature ["as" identifier]
("," feature ["as" identifier])* [","] ")"
feature ::= identifier
A future statement must appear near the top of the module. The only
lines that can appear before a future statement are:
* the module docstring (if any),
* comments,
* blank lines, and
* other future statements.
The only feature that requires using the future statement is
"annotations" (see **PEP 563**).
All historical features enabled by the future statement are still
recognized by Python 3. The list includes "absolute_import",
"division", "generators", "generator_stop", "unicode_literals",
"print_function", "nested_scopes" and "with_statement". They are all
redundant because they are always enabled, and only kept for backwards
compatibility.
A future statement is recognized and treated specially at compile
time: Changes to the semantics of core constructs are often
implemented by generating different code. It may even be the case
that a new feature introduces new incompatible syntax (such as a new
reserved word), in which case the compiler may need to parse the
module differently. Such decisions cannot be pushed off until
runtime.
For any given release, the compiler knows which feature names have
been defined, and raises a compile-time error if a future statement
contains a feature not known to it.
The direct runtime semantics are the same as for any import statement:
there is a standard module "__future__", described later, and it will
be imported in the usual way at the time the future statement is
executed.
The interesting runtime semantics depend on the specific feature
enabled by the future statement.
Note that there is nothing special about the statement:
import __future__ [as name]
That is not a future statement; it’s an ordinary import statement with
no special semantics or syntax restrictions.
Code compiled by calls to the built-in functions "exec()" and
"compile()" that occur in a module "M" containing a future statement
will, by default, use the new syntax or semantics associated with the
future statement. This can be controlled by optional arguments to
"compile()" — see the documentation of that function for details.
A future statement typed at an interactive interpreter prompt will
take effect for the rest of the interpreter session. If an
interpreter is started with the "-i" option, is passed a script name
to execute, and the script includes a future statement, it will be in
effect in the interactive session started after the script is
executed.
See also:
**PEP 236** - Back to the __future__
The original proposal for the __future__ mechanism.
a Membership test operations
**************************
The operators "in" and "not in" test for membership. "x in s"
evaluates to "True" if *x* is a member of *s*, and "False" otherwise.
"x not in s" returns the negation of "x in s". All built-in sequences
and set types support this as well as dictionary, for which "in" tests
whether the dictionary has a given key. For container types such as
list, tuple, set, frozenset, dict, or collections.deque, the
expression "x in y" is equivalent to "any(x is e or x == e for e in
y)".
For the string and bytes types, "x in y" is "True" if and only if *x*
is a substring of *y*. An equivalent test is "y.find(x) != -1".
Empty strings are always considered to be a substring of any other
string, so """ in "abc"" will return "True".
For user-defined classes which define the "__contains__()" method, "x
in y" returns "True" if "y.__contains__(x)" returns a true value, and
"False" otherwise.
For user-defined classes which do not define "__contains__()" but do
define "__iter__()", "x in y" is "True" if some value "z", for which
the expression "x is z or x == z" is true, is produced while iterating
over "y". If an exception is raised during the iteration, it is as if
"in" raised that exception.
Lastly, the old-style iteration protocol is tried: if a class defines
"__getitem__()", "x in y" is "True" if and only if there is a non-
negative integer index *i* such that "x is y[i] or x == y[i]", and no
lower integer index raises the "IndexError" exception. (If any other
exception is raised, it is as if "in" raised that exception).
The operator "not in" is defined to have the inverse truth value of
"in".
aV Integer literals
****************
Integer literals are described by the following lexical definitions:
integer ::= decinteger | bininteger | octinteger | hexinteger
decinteger ::= nonzerodigit (["_"] digit)* | "0"+ (["_"] "0")*
bininteger ::= "0" ("b" | "B") (["_"] bindigit)+
octinteger ::= "0" ("o" | "O") (["_"] octdigit)+
hexinteger ::= "0" ("x" | "X") (["_"] hexdigit)+
nonzerodigit ::= "1"..."9"
digit ::= "0"..."9"
bindigit ::= "0" | "1"
octdigit ::= "0"..."7"
hexdigit ::= digit | "a"..."f" | "A"..."F"
There is no limit for the length of integer literals apart from what
can be stored in available memory.
Underscores are ignored for determining the numeric value of the
literal. They can be used to group digits for enhanced readability.
One underscore can occur between digits, and after base specifiers
like "0x".
Note that leading zeros in a non-zero decimal number are not allowed.
This is for disambiguation with C-style octal literals, which Python
used before version 3.0.
Some examples of integer literals:
7 2147483647 0o177 0b100110111
3 79228162514264337593543950336 0o377 0xdeadbeef
100_000_000_000 0b_1110_0101
Changed in version 3.6: Underscores are now allowed for grouping
purposes in literals.
a^ Lambdas
*******
lambda_expr ::= "lambda" [parameter_list] ":" expression
lambda_expr_nocond ::= "lambda" [parameter_list] ":" expression_nocond
Lambda expressions (sometimes called lambda forms) are used to create
anonymous functions. The expression "lambda parameters: expression"
yields a function object. The unnamed object behaves like a function
object defined with:
def <lambda>(parameters):
return expression
See section Function definitions for the syntax of parameter lists.
Note that functions created with lambda expressions cannot contain
statements or annotations.
a/ List displays
*************
A list display is a possibly empty series of expressions enclosed in
square brackets:
list_display ::= "[" [starred_list | comprehension] "]"
A list display yields a new list object, the contents being specified
by either a list of expressions or a comprehension. When a comma-
separated list of expressions is supplied, its elements are evaluated
from left to right and placed into the list object in that order.
When a comprehension is supplied, the list is constructed from the
elements resulting from the comprehension.
u� Naming and binding
******************
Binding of names
================
*Names* refer to objects. Names are introduced by name binding
operations.
The following constructs bind names: formal parameters to functions,
"import" statements, class and function definitions (these bind the
class or function name in the defining block), and targets that are
identifiers if occurring in an assignment, "for" loop header, or after
"as" in a "with" statement or "except" clause. The "import" statement
of the form "from ... import *" binds all names defined in the
imported module, except those beginning with an underscore. This form
may only be used at the module level.
A target occurring in a "del" statement is also considered bound for
this purpose (though the actual semantics are to unbind the name).
Each assignment or import statement occurs within a block defined by a
class or function definition or at the module level (the top-level
code block).
If a name is bound in a block, it is a local variable of that block,
unless declared as "nonlocal" or "global". If a name is bound at the
module level, it is a global variable. (The variables of the module
code block are local and global.) If a variable is used in a code
block but not defined there, it is a *free variable*.
Each occurrence of a name in the program text refers to the *binding*
of that name established by the following name resolution rules.
Resolution of names
===================
A *scope* defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. If the
definition occurs in a function block, the scope extends to any blocks
contained within the defining one, unless a contained block introduces
a different binding for the name.
When a name is used in a code block, it is resolved using the nearest
enclosing scope. The set of all such scopes visible to a code block
is called the block’s *environment*.
When a name is not found at all, a "NameError" exception is raised. If
the current scope is a function scope, and the name refers to a local
variable that has not yet been bound to a value at the point where the
name is used, an "UnboundLocalError" exception is raised.
"UnboundLocalError" is a subclass of "NameError".
If a name binding operation occurs anywhere within a code block, all
uses of the name within the block are treated as references to the
current block. This can lead to errors when a name is used within a
block before it is bound. This rule is subtle. Python lacks
declarations and allows name binding operations to occur anywhere
within a code block. The local variables of a code block can be
determined by scanning the entire text of the block for name binding
operations.
If the "global" statement occurs within a block, all uses of the name
specified in the statement refer to the binding of that name in the
top-level namespace. Names are resolved in the top-level namespace by
searching the global namespace, i.e. the namespace of the module
containing the code block, and the builtins namespace, the namespace
of the module "builtins". The global namespace is searched first. If
the name is not found there, the builtins namespace is searched. The
"global" statement must precede all uses of the name.
The "global" statement has the same scope as a name binding operation
in the same block. If the nearest enclosing scope for a free variable
contains a global statement, the free variable is treated as a global.
The "nonlocal" statement causes corresponding names to refer to
previously bound variables in the nearest enclosing function scope.
"SyntaxError" is raised at compile time if the given name does not
exist in any enclosing function scope.
The namespace for a module is automatically created the first time a
module is imported. The main module for a script is always called
"__main__".
Class definition blocks and arguments to "exec()" and "eval()" are
special in the context of name resolution. A class definition is an
executable statement that may use and define names. These references
follow the normal rules for name resolution with an exception that
unbound local variables are looked up in the global namespace. The
namespace of the class definition becomes the attribute dictionary of
the class. The scope of names defined in a class block is limited to
the class block; it does not extend to the code blocks of methods –
this includes comprehensions and generator expressions since they are
implemented using a function scope. This means that the following
will fail:
class A:
a = 42
b = list(a + i for i in range(10))
Builtins and restricted execution
=================================
**CPython implementation detail:** Users should not touch
"__builtins__"; it is strictly an implementation detail. Users
wanting to override values in the builtins namespace should "import"
the "builtins" module and modify its attributes appropriately.
The builtins namespace associated with the execution of a code block
is actually found by looking up the name "__builtins__" in its global
namespace; this should be a dictionary or a module (in the latter case
the module’s dictionary is used). By default, when in the "__main__"
module, "__builtins__" is the built-in module "builtins"; when in any
other module, "__builtins__" is an alias for the dictionary of the
"builtins" module itself.
Interaction with dynamic features
=================================
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
a� The "nonlocal" statement
************************
nonlocal_stmt ::= "nonlocal" identifier ("," identifier)*
The "nonlocal" statement causes the listed identifiers to refer to
previously bound variables in the nearest enclosing scope excluding
globals. This is important because the default behavior for binding is
to search the local namespace first. The statement allows
encapsulated code to rebind variables outside of the local scope
besides the global (module) scope.
Names listed in a "nonlocal" statement, unlike those listed in a
"global" statement, must refer to pre-existing bindings in an
enclosing scope (the scope in which a new binding should be created
cannot be determined unambiguously).
Names listed in a "nonlocal" statement must not collide with pre-
existing bindings in the local scope.
See also:
**PEP 3104** - Access to Names in Outer Scopes
The specification for the "nonlocal" statement.
u� Numeric literals
****************
There are three types of numeric literals: integers, floating point
numbers, and imaginary numbers. There are no complex literals
(complex numbers can be formed by adding a real number and an
imaginary number).
Note that numeric literals do not include a sign; a phrase like "-1"
is actually an expression composed of the unary operator ‘"-"’ and the
literal "1".
u Emulating numeric types
***********************
The following methods can be defined to emulate numeric objects.
Methods corresponding to operations that are not supported by the
particular kind of number implemented (e.g., bitwise operations for
non-integral numbers) should be left undefined.
object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__matmul__(self, other)
object.__truediv__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|"). For instance, to
evaluate the expression "x + y", where *x* is an instance of a
class that has an "__add__()" method, "x.__add__(y)" is called.
The "__divmod__()" method should be the equivalent to using
"__floordiv__()" and "__mod__()"; it should not be related to
"__truediv__()". Note that "__pow__()" should be defined to accept
an optional third argument if the ternary version of the built-in
"pow()" function is to be supported.
If one of those methods does not support the operation with the
supplied arguments, it should return "NotImplemented".
object.__radd__(self, other)
object.__rsub__(self, other)
object.__rmul__(self, other)
object.__rmatmul__(self, other)
object.__rtruediv__(self, other)
object.__rfloordiv__(self, other)
object.__rmod__(self, other)
object.__rdivmod__(self, other)
object.__rpow__(self, other[, modulo])
object.__rlshift__(self, other)
object.__rrshift__(self, other)
object.__rand__(self, other)
object.__rxor__(self, other)
object.__ror__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|") with reflected (swapped)
operands. These functions are only called if the left operand does
not support the corresponding operation [3] and the operands are of
different types. [4] For instance, to evaluate the expression "x -
y", where *y* is an instance of a class that has an "__rsub__()"
method, "y.__rsub__(x)" is called if "x.__sub__(y)" returns
*NotImplemented*.
Note that ternary "pow()" will not try calling "__rpow__()" (the
coercion rules would become too complicated).
Note:
If the right operand’s type is a subclass of the left operand’s
type and that subclass provides a different implementation of the
reflected method for the operation, this method will be called
before the left operand’s non-reflected method. This behavior
allows subclasses to override their ancestors’ operations.
object.__iadd__(self, other)
object.__isub__(self, other)
object.__imul__(self, other)
object.__imatmul__(self, other)
object.__itruediv__(self, other)
object.__ifloordiv__(self, other)
object.__imod__(self, other)
object.__ipow__(self, other[, modulo])
object.__ilshift__(self, other)
object.__irshift__(self, other)
object.__iand__(self, other)
object.__ixor__(self, other)
object.__ior__(self, other)
These methods are called to implement the augmented arithmetic
assignments ("+=", "-=", "*=", "@=", "/=", "//=", "%=", "**=",
"<<=", ">>=", "&=", "^=", "|="). These methods should attempt to
do the operation in-place (modifying *self*) and return the result
(which could be, but does not have to be, *self*). If a specific
method is not defined, the augmented assignment falls back to the
normal methods. For instance, if *x* is an instance of a class
with an "__iadd__()" method, "x += y" is equivalent to "x =
x.__iadd__(y)" . Otherwise, "x.__add__(y)" and "y.__radd__(x)" are
considered, as with the evaluation of "x + y". In certain
situations, augmented assignment can result in unexpected errors
(see Why does a_tuple[i] += [‘item’] raise an exception when the
addition works?), but this behavior is in fact part of the data
model.
Note:
Due to a bug in the dispatching mechanism for "**=", a class that
defines "__ipow__()" but returns "NotImplemented" would fail to
fall back to "x.__pow__(y)" and "y.__rpow__(x)". This bug is
fixed in Python 3.10.
object.__neg__(self)
object.__pos__(self)
object.__abs__(self)
object.__invert__(self)
Called to implement the unary arithmetic operations ("-", "+",
"abs()" and "~").
object.__complex__(self)
object.__int__(self)
object.__float__(self)
Called to implement the built-in functions "complex()", "int()" and
"float()". Should return a value of the appropriate type.
object.__index__(self)
Called to implement "operator.index()", and whenever Python needs
to losslessly convert the numeric object to an integer object (such
as in slicing, or in the built-in "bin()", "hex()" and "oct()"
functions). Presence of this method indicates that the numeric
object is an integer type. Must return an integer.
If "__int__()", "__float__()" and "__complex__()" are not defined
then corresponding built-in functions "int()", "float()" and
"complex()" fall back to "__index__()".
object.__round__(self[, ndigits])
object.__trunc__(self)
object.__floor__(self)
object.__ceil__(self)
Called to implement the built-in function "round()" and "math"
functions "trunc()", "floor()" and "ceil()". Unless *ndigits* is
passed to "__round__()" all these methods should return the value
of the object truncated to an "Integral" (typically an "int").
The built-in function "int()" falls back to "__trunc__()" if
neither "__int__()" nor "__index__()" is defined.
u Objects, values and types
*************************
*Objects* are Python’s abstraction for data. All data in a Python
program is represented by objects or by relations between objects. (In
a sense, and in conformance to Von Neumann’s model of a “stored
program computer”, code is also represented by objects.)
Every object has an identity, a type and a value. An object’s
*identity* never changes once it has been created; you may think of it
as the object’s address in memory. The ‘"is"’ operator compares the
identity of two objects; the "id()" function returns an integer
representing its identity.
**CPython implementation detail:** For CPython, "id(x)" is the memory
address where "x" is stored.
An object’s type determines the operations that the object supports
(e.g., “does it have a length?”) and also defines the possible values
for objects of that type. The "type()" function returns an object’s
type (which is an object itself). Like its identity, an object’s
*type* is also unchangeable. [1]
The *value* of some objects can change. Objects whose value can
change are said to be *mutable*; objects whose value is unchangeable
once they are created are called *immutable*. (The value of an
immutable container object that contains a reference to a mutable
object can change when the latter’s value is changed; however the
container is still considered immutable, because the collection of
objects it contains cannot be changed. So, immutability is not
strictly the same as having an unchangeable value, it is more subtle.)
An object’s mutability is determined by its type; for instance,
numbers, strings and tuples are immutable, while dictionaries and
lists are mutable.
Objects are never explicitly destroyed; however, when they become
unreachable they may be garbage-collected. An implementation is
allowed to postpone garbage collection or omit it altogether — it is a
matter of implementation quality how garbage collection is
implemented, as long as no objects are collected that are still
reachable.
**CPython implementation detail:** CPython currently uses a reference-
counting scheme with (optional) delayed detection of cyclically linked
garbage, which collects most objects as soon as they become
unreachable, but is not guaranteed to collect garbage containing
circular references. See the documentation of the "gc" module for
information on controlling the collection of cyclic garbage. Other
implementations act differently and CPython may change. Do not depend
on immediate finalization of objects when they become unreachable (so
you should always close files explicitly).
Note that the use of the implementation’s tracing or debugging
facilities may keep objects alive that would normally be collectable.
Also note that catching an exception with a ‘"try"…"except"’ statement
may keep objects alive.
Some objects contain references to “external” resources such as open
files or windows. It is understood that these resources are freed
when the object is garbage-collected, but since garbage collection is
not guaranteed to happen, such objects also provide an explicit way to
release the external resource, usually a "close()" method. Programs
are strongly recommended to explicitly close such objects. The
‘"try"…"finally"’ statement and the ‘"with"’ statement provide
convenient ways to do this.
Some objects contain references to other objects; these are called
*containers*. Examples of containers are tuples, lists and
dictionaries. The references are part of a container’s value. In
most cases, when we talk about the value of a container, we imply the
values, not the identities of the contained objects; however, when we
talk about the mutability of a container, only the identities of the
immediately contained objects are implied. So, if an immutable
container (like a tuple) contains a reference to a mutable object, its
value changes if that mutable object is changed.
Types affect almost all aspects of object behavior. Even the
importance of object identity is affected in some sense: for immutable
types, operations that compute new values may actually return a
reference to any existing object with the same type and value, while
for mutable objects this is not allowed. E.g., after "a = 1; b = 1",
"a" and "b" may or may not refer to the same object with the value
one, depending on the implementation, but after "c = []; d = []", "c"
and "d" are guaranteed to refer to two different, unique, newly
created empty lists. (Note that "c = d = []" assigns the same object
to both "c" and "d".)
u� Operator precedence
*******************
The following table summarizes the operator precedence in Python, from
lowest precedence (least binding) to highest precedence (most
binding). Operators in the same box have the same precedence. Unless
the syntax is explicitly given, operators are binary. Operators in
the same box group left to right (except for exponentiation, which
groups from right to left).
Note that comparisons, membership tests, and identity tests, all have
the same precedence and have a left-to-right chaining feature as
described in the Comparisons section.
+-------------------------------------------------+---------------------------------------+
| Operator | Description |
|=================================================|=======================================|
| ":=" | Assignment expression |
+-------------------------------------------------+---------------------------------------+
| "lambda" | Lambda expression |
+-------------------------------------------------+---------------------------------------+
| "if" – "else" | Conditional expression |
+-------------------------------------------------+---------------------------------------+
| "or" | Boolean OR |
+-------------------------------------------------+---------------------------------------+
| "and" | Boolean AND |
+-------------------------------------------------+---------------------------------------+
| "not" "x" | Boolean NOT |
+-------------------------------------------------+---------------------------------------+
| "in", "not in", "is", "is not", "<", "<=", ">", | Comparisons, including membership |
| ">=", "!=", "==" | tests and identity tests |
+-------------------------------------------------+---------------------------------------+
| "|" | Bitwise OR |
+-------------------------------------------------+---------------------------------------+
| "^" | Bitwise XOR |
+-------------------------------------------------+---------------------------------------+
| "&" | Bitwise AND |
+-------------------------------------------------+---------------------------------------+
| "<<", ">>" | Shifts |
+-------------------------------------------------+---------------------------------------+
| "+", "-" | Addition and subtraction |
+-------------------------------------------------+---------------------------------------+
| "*", "@", "/", "//", "%" | Multiplication, matrix |
| | multiplication, division, floor |
| | division, remainder [5] |
+-------------------------------------------------+---------------------------------------+
| "+x", "-x", "~x" | Positive, negative, bitwise NOT |
+-------------------------------------------------+---------------------------------------+
| "**" | Exponentiation [6] |
+-------------------------------------------------+---------------------------------------+
| "await" "x" | Await expression |
+-------------------------------------------------+---------------------------------------+
| "x[index]", "x[index:index]", | Subscription, slicing, call, |
| "x(arguments...)", "x.attribute" | attribute reference |
+-------------------------------------------------+---------------------------------------+
| "(expressions...)", "[expressions...]", "{key: | Binding or parenthesized expression, |
| value...}", "{expressions...}" | list display, dictionary display, set |
| | display |
+-------------------------------------------------+---------------------------------------+
-[ Footnotes ]-
[1] While "abs(x%y) < abs(y)" is true mathematically, for floats it
may not be true numerically due to roundoff. For example, and
assuming a platform on which a Python float is an IEEE 754 double-
precision number, in order that "-1e-100 % 1e100" have the same
sign as "1e100", the computed result is "-1e-100 + 1e100", which
is numerically exactly equal to "1e100". The function
"math.fmod()" returns a result whose sign matches the sign of the
first argument instead, and so returns "-1e-100" in this case.
Which approach is more appropriate depends on the application.
[2] If x is very close to an exact integer multiple of y, it’s
possible for "x//y" to be one larger than "(x-x%y)//y" due to
rounding. In such cases, Python returns the latter result, in
order to preserve that "divmod(x,y)[0] * y + x % y" be very close
to "x".
[3] The Unicode standard distinguishes between *code points* (e.g.
U+0041) and *abstract characters* (e.g. “LATIN CAPITAL LETTER A”).
While most abstract characters in Unicode are only represented
using one code point, there is a number of abstract characters
that can in addition be represented using a sequence of more than
one code point. For example, the abstract character “LATIN
CAPITAL LETTER C WITH CEDILLA” can be represented as a single
*precomposed character* at code position U+00C7, or as a sequence
of a *base character* at code position U+0043 (LATIN CAPITAL
LETTER C), followed by a *combining character* at code position
U+0327 (COMBINING CEDILLA).
The comparison operators on strings compare at the level of
Unicode code points. This may be counter-intuitive to humans. For
example, ""\u00C7" == "\u0043\u0327"" is "False", even though both
strings represent the same abstract character “LATIN CAPITAL
LETTER C WITH CEDILLA”.
To compare strings at the level of abstract characters (that is,
in a way intuitive to humans), use "unicodedata.normalize()".
[4] Due to automatic garbage-collection, free lists, and the dynamic
nature of descriptors, you may notice seemingly unusual behaviour
in certain uses of the "is" operator, like those involving
comparisons between instance methods, or constants. Check their
documentation for more info.
[5] The "%" operator is also used for string formatting; the same
precedence applies.
[6] The power operator "**" binds less tightly than an arithmetic or
bitwise unary operator on its right, that is, "2**-1" is "0.5".
uw The "pass" statement
********************
pass_stmt ::= "pass"
"pass" is a null operation — when it is executed, nothing happens. It
is useful as a placeholder when a statement is required syntactically,
but no code needs to be executed, for example:
def f(arg): pass # a function that does nothing (yet)
class C: pass # a class with no methods (yet)
a� The power operator
******************
The power operator binds more tightly than unary operators on its
left; it binds less tightly than unary operators on its right. The
syntax is:
power ::= (await_expr | primary) ["**" u_expr]
Thus, in an unparenthesized sequence of power and unary operators, the
operators are evaluated from right to left (this does not constrain
the evaluation order for the operands): "-1**2" results in "-1".
The power operator has the same semantics as the built-in "pow()"
function, when called with two arguments: it yields its left argument
raised to the power of its right argument. The numeric arguments are
first converted to a common type, and the result is of that type.
For int operands, the result has the same type as the operands unless
the second argument is negative; in that case, all arguments are
converted to float and a float result is delivered. For example,
"10**2" returns "100", but "10**-2" returns "0.01".
Raising "0.0" to a negative power results in a "ZeroDivisionError".
Raising a negative number to a fractional power results in a "complex"
number. (In earlier versions it raised a "ValueError".)
uJ
The "raise" statement
*********************
raise_stmt ::= "raise" [expression ["from" expression]]
If no expressions are present, "raise" re-raises the last exception
that was active in the current scope. If no exception is active in
the current scope, a "RuntimeError" exception is raised indicating
that this is an error.
Otherwise, "raise" evaluates the first expression as the exception
object. It must be either a subclass or an instance of
"BaseException". If it is a class, the exception instance will be
obtained when needed by instantiating the class with no arguments.
The *type* of the exception is the exception instance’s class, the
*value* is the instance itself.
A traceback object is normally created automatically when an exception
is raised and attached to it as the "__traceback__" attribute, which
is writable. You can create an exception and set your own traceback in
one step using the "with_traceback()" exception method (which returns
the same exception instance, with its traceback set to its argument),
like so:
raise Exception("foo occurred").with_traceback(tracebackobj)
The "from" clause is used for exception chaining: if given, the second
*expression* must be another exception class or instance. If the
second expression is an exception instance, it will be attached to the
raised exception as the "__cause__" attribute (which is writable). If
the expression is an exception class, the class will be instantiated
and the resulting exception instance will be attached to the raised
exception as the "__cause__" attribute. If the raised exception is not
handled, both exceptions will be printed:
>>> try:
... print(1 / 0)
... except Exception as exc:
... raise RuntimeError("Something bad happened") from exc
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
A similar mechanism works implicitly if an exception is raised inside
an exception handler or a "finally" clause: the previous exception is
then attached as the new exception’s "__context__" attribute:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something bad happened")
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
Exception chaining can be explicitly suppressed by specifying "None"
in the "from" clause:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something bad happened") from None
...
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
Additional information on exceptions can be found in section
Exceptions, and information about handling exceptions is in section
The try statement.
Changed in version 3.3: "None" is now permitted as "Y" in "raise X
from Y".
New in version 3.3: The "__suppress_context__" attribute to suppress
automatic display of the exception context.
a The "return" statement
**********************
return_stmt ::= "return" [expression_list]
"return" may only occur syntactically nested in a function definition,
not within a nested class definition.
If an expression list is present, it is evaluated, else "None" is
substituted.
"return" leaves the current function call with the expression list (or
"None") as return value.
When "return" passes control out of a "try" statement with a "finally"
clause, that "finally" clause is executed before really leaving the
function.
In a generator function, the "return" statement indicates that the
generator is done and will cause "StopIteration" to be raised. The
returned value (if any) is used as an argument to construct
"StopIteration" and becomes the "StopIteration.value" attribute.
In an asynchronous generator function, an empty "return" statement
indicates that the asynchronous generator is done and will cause
"StopAsyncIteration" to be raised. A non-empty "return" statement is
a syntax error in an asynchronous generator function.
u� Emulating container types
*************************
The following methods can be defined to implement container objects.
Containers usually are sequences (such as lists or tuples) or mappings
(like dictionaries), but can represent other containers as well. The
first set of methods is used either to emulate a sequence or to
emulate a mapping; the difference is that for a sequence, the
allowable keys should be the integers *k* for which "0 <= k < N" where
*N* is the length of the sequence, or slice objects, which define a
range of items. It is also recommended that mappings provide the
methods "keys()", "values()", "items()", "get()", "clear()",
"setdefault()", "pop()", "popitem()", "copy()", and "update()"
behaving similar to those for Python’s standard dictionary objects.
The "collections.abc" module provides a "MutableMapping" abstract base
class to help create those methods from a base set of "__getitem__()",
"__setitem__()", "__delitem__()", and "keys()". Mutable sequences
should provide methods "append()", "count()", "index()", "extend()",
"insert()", "pop()", "remove()", "reverse()" and "sort()", like Python
standard list objects. Finally, sequence types should implement
addition (meaning concatenation) and multiplication (meaning
repetition) by defining the methods "__add__()", "__radd__()",
"__iadd__()", "__mul__()", "__rmul__()" and "__imul__()" described
below; they should not define other numerical operators. It is
recommended that both mappings and sequences implement the
"__contains__()" method to allow efficient use of the "in" operator;
for mappings, "in" should search the mapping’s keys; for sequences, it
should search through the values. It is further recommended that both
mappings and sequences implement the "__iter__()" method to allow
efficient iteration through the container; for mappings, "__iter__()"
should iterate through the object’s keys; for sequences, it should
iterate through the values.
object.__len__(self)
Called to implement the built-in function "len()". Should return
the length of the object, an integer ">=" 0. Also, an object that
doesn’t define a "__bool__()" method and whose "__len__()" method
returns zero is considered to be false in a Boolean context.
**CPython implementation detail:** In CPython, the length is
required to be at most "sys.maxsize". If the length is larger than
"sys.maxsize" some features (such as "len()") may raise
"OverflowError". To prevent raising "OverflowError" by truth value
testing, an object must define a "__bool__()" method.
object.__length_hint__(self)
Called to implement "operator.length_hint()". Should return an
estimated length for the object (which may be greater or less than
the actual length). The length must be an integer ">=" 0. The
return value may also be "NotImplemented", which is treated the
same as if the "__length_hint__" method didn’t exist at all. This
method is purely an optimization and is never required for
correctness.
New in version 3.4.
Note:
Slicing is done exclusively with the following three methods. A
call like
a[1:2] = b
is translated to
a[slice(1, 2, None)] = b
and so forth. Missing slice items are always filled in with "None".
object.__getitem__(self, key)
Called to implement evaluation of "self[key]". For sequence types,
the accepted keys should be integers and slice objects. Note that
the special interpretation of negative indexes (if the class wishes
to emulate a sequence type) is up to the "__getitem__()" method. If
*key* is of an inappropriate type, "TypeError" may be raised; if of
a value outside the set of indexes for the sequence (after any
special interpretation of negative values), "IndexError" should be
raised. For mapping types, if *key* is missing (not in the
container), "KeyError" should be raised.
Note:
"for" loops expect that an "IndexError" will be raised for
illegal indexes to allow proper detection of the end of the
sequence.
object.__setitem__(self, key, value)
Called to implement assignment to "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support changes to the values for keys, or if new keys
can be added, or for sequences if elements can be replaced. The
same exceptions should be raised for improper *key* values as for
the "__getitem__()" method.
object.__delitem__(self, key)
Called to implement deletion of "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support removal of keys, or for sequences if elements
can be removed from the sequence. The same exceptions should be
raised for improper *key* values as for the "__getitem__()" method.
object.__missing__(self, key)
Called by "dict"."__getitem__()" to implement "self[key]" for dict
subclasses when key is not in the dictionary.
object.__iter__(self)
This method is called when an iterator is required for a container.
This method should return a new iterator object that can iterate
over all the objects in the container. For mappings, it should
iterate over the keys of the container.
Iterator objects also need to implement this method; they are
required to return themselves. For more information on iterator
objects, see Iterator Types.
object.__reversed__(self)
Called (if present) by the "reversed()" built-in to implement
reverse iteration. It should return a new iterator object that
iterates over all the objects in the container in reverse order.
If the "__reversed__()" method is not provided, the "reversed()"
built-in will fall back to using the sequence protocol ("__len__()"
and "__getitem__()"). Objects that support the sequence protocol
should only provide "__reversed__()" if they can provide an
implementation that is more efficient than the one provided by
"reversed()".
The membership test operators ("in" and "not in") are normally
implemented as an iteration through a container. However, container
objects can supply the following special method with a more efficient
implementation, which also does not require the object be iterable.
object.__contains__(self, item)
Called to implement membership test operators. Should return true
if *item* is in *self*, false otherwise. For mapping objects, this
should consider the keys of the mapping rather than the values or
the key-item pairs.
For objects that don’t define "__contains__()", the membership test
first tries iteration via "__iter__()", then the old sequence
iteration protocol via "__getitem__()", see this section in the
language reference.
a� Shifting operations
*******************
The shifting operations have lower priority than the arithmetic
operations:
shift_expr ::= a_expr | shift_expr ("<<" | ">>") a_expr
These operators accept integers as arguments. They shift the first
argument to the left or right by the number of bits given by the
second argument.
A right shift by *n* bits is defined as floor division by "pow(2,n)".
A left shift by *n* bits is defined as multiplication with "pow(2,n)".
a� Slicings
********
A slicing selects a range of items in a sequence object (e.g., a
string, tuple or list). Slicings may be used as expressions or as
targets in assignment or "del" statements. The syntax for a slicing:
slicing ::= primary "[" slice_list "]"
slice_list ::= slice_item ("," slice_item)* [","]
slice_item ::= expression | proper_slice
proper_slice ::= [lower_bound] ":" [upper_bound] [ ":" [stride] ]
lower_bound ::= expression
upper_bound ::= expression
stride ::= expression
There is ambiguity in the formal syntax here: anything that looks like
an expression list also looks like a slice list, so any subscription
can be interpreted as a slicing. Rather than further complicating the
syntax, this is disambiguated by defining that in this case the
interpretation as a subscription takes priority over the
interpretation as a slicing (this is the case if the slice list
contains no proper slice).
The semantics for a slicing are as follows. The primary is indexed
(using the same "__getitem__()" method as normal subscription) with a
key that is constructed from the slice list, as follows. If the slice
list contains at least one comma, the key is a tuple containing the
conversion of the slice items; otherwise, the conversion of the lone
slice item is the key. The conversion of a slice item that is an
expression is that expression. The conversion of a proper slice is a
slice object (see section The standard type hierarchy) whose "start",
"stop" and "step" attributes are the values of the expressions given
as lower bound, upper bound and stride, respectively, substituting
"None" for missing expressions.
u Special Attributes
******************
The implementation adds a few special read-only attributes to several
object types, where they are relevant. Some of these are not reported
by the "dir()" built-in function.
object.__dict__
A dictionary or other mapping object used to store an object’s
(writable) attributes.
instance.__class__
The class to which a class instance belongs.
class.__bases__
The tuple of base classes of a class object.
definition.__name__
The name of the class, function, method, descriptor, or generator
instance.
definition.__qualname__
The *qualified name* of the class, function, method, descriptor, or
generator instance.
New in version 3.3.
class.__mro__
This attribute is a tuple of classes that are considered when
looking for base classes during method resolution.
class.mro()
This method can be overridden by a metaclass to customize the
method resolution order for its instances. It is called at class
instantiation, and its result is stored in "__mro__".
class.__subclasses__()
Each class keeps a list of weak references to its immediate
subclasses. This method returns a list of all those references
still alive. Example:
>>> int.__subclasses__()
[<class 'bool'>]
u�� Special method names
********************
A class can implement certain operations that are invoked by special
syntax (such as arithmetic operations or subscripting and slicing) by
defining methods with special names. This is Python’s approach to
*operator overloading*, allowing classes to define their own behavior
with respect to language operators. For instance, if a class defines
a method named "__getitem__()", and "x" is an instance of this class,
then "x[i]" is roughly equivalent to "type(x).__getitem__(x, i)".
Except where mentioned, attempts to execute an operation raise an
exception when no appropriate method is defined (typically
"AttributeError" or "TypeError").
Setting a special method to "None" indicates that the corresponding
operation is not available. For example, if a class sets "__iter__()"
to "None", the class is not iterable, so calling "iter()" on its
instances will raise a "TypeError" (without falling back to
"__getitem__()"). [2]
When implementing a class that emulates any built-in type, it is
important that the emulation only be implemented to the degree that it
makes sense for the object being modelled. For example, some
sequences may work well with retrieval of individual elements, but
extracting a slice may not make sense. (One example of this is the
"NodeList" interface in the W3C’s Document Object Model.)
Basic customization
===================
object.__new__(cls[, ...])
Called to create a new instance of class *cls*. "__new__()" is a
static method (special-cased so you need not declare it as such)
that takes the class of which an instance was requested as its
first argument. The remaining arguments are those passed to the
object constructor expression (the call to the class). The return
value of "__new__()" should be the new object instance (usually an
instance of *cls*).
Typical implementations create a new instance of the class by
invoking the superclass’s "__new__()" method using
"super().__new__(cls[, ...])" with appropriate arguments and then
modifying the newly-created instance as necessary before returning
it.
If "__new__()" is invoked during object construction and it returns
an instance of *cls*, then the new instance’s "__init__()" method
will be invoked like "__init__(self[, ...])", where *self* is the
new instance and the remaining arguments are the same as were
passed to the object constructor.
If "__new__()" does not return an instance of *cls*, then the new
instance’s "__init__()" method will not be invoked.
"__new__()" is intended mainly to allow subclasses of immutable
types (like int, str, or tuple) to customize instance creation. It
is also commonly overridden in custom metaclasses in order to
customize class creation.
object.__init__(self[, ...])
Called after the instance has been created (by "__new__()"), but
before it is returned to the caller. The arguments are those
passed to the class constructor expression. If a base class has an
"__init__()" method, the derived class’s "__init__()" method, if
any, must explicitly call it to ensure proper initialization of the
base class part of the instance; for example:
"super().__init__([args...])".
Because "__new__()" and "__init__()" work together in constructing
objects ("__new__()" to create it, and "__init__()" to customize
it), no non-"None" value may be returned by "__init__()"; doing so
will cause a "TypeError" to be raised at runtime.
object.__del__(self)
Called when the instance is about to be destroyed. This is also
called a finalizer or (improperly) a destructor. If a base class
has a "__del__()" method, the derived class’s "__del__()" method,
if any, must explicitly call it to ensure proper deletion of the
base class part of the instance.
It is possible (though not recommended!) for the "__del__()" method
to postpone destruction of the instance by creating a new reference
to it. This is called object *resurrection*. It is
implementation-dependent whether "__del__()" is called a second
time when a resurrected object is about to be destroyed; the
current *CPython* implementation only calls it once.
It is not guaranteed that "__del__()" methods are called for
objects that still exist when the interpreter exits.
Note:
"del x" doesn’t directly call "x.__del__()" — the former
decrements the reference count for "x" by one, and the latter is
only called when "x"’s reference count reaches zero.
**CPython implementation detail:** It is possible for a reference
cycle to prevent the reference count of an object from going to
zero. In this case, the cycle will be later detected and deleted
by the *cyclic garbage collector*. A common cause of reference
cycles is when an exception has been caught in a local variable.
The frame’s locals then reference the exception, which references
its own traceback, which references the locals of all frames caught
in the traceback.
See also: Documentation for the "gc" module.
Warning:
Due to the precarious circumstances under which "__del__()"
methods are invoked, exceptions that occur during their execution
are ignored, and a warning is printed to "sys.stderr" instead.
In particular:
* "__del__()" can be invoked when arbitrary code is being
executed, including from any arbitrary thread. If "__del__()"
needs to take a lock or invoke any other blocking resource, it
may deadlock as the resource may already be taken by the code
that gets interrupted to execute "__del__()".
* "__del__()" can be executed during interpreter shutdown. As a
consequence, the global variables it needs to access (including
other modules) may already have been deleted or set to "None".
Python guarantees that globals whose name begins with a single
underscore are deleted from their module before other globals
are deleted; if no other references to such globals exist, this
may help in assuring that imported modules are still available
at the time when the "__del__()" method is called.
object.__repr__(self)
Called by the "repr()" built-in function to compute the “official”
string representation of an object. If at all possible, this
should look like a valid Python expression that could be used to
recreate an object with the same value (given an appropriate
environment). If this is not possible, a string of the form
"<...some useful description...>" should be returned. The return
value must be a string object. If a class defines "__repr__()" but
not "__str__()", then "__repr__()" is also used when an “informal”
string representation of instances of that class is required.
This is typically used for debugging, so it is important that the
representation is information-rich and unambiguous.
object.__str__(self)
Called by "str(object)" and the built-in functions "format()" and
"print()" to compute the “informal” or nicely printable string
representation of an object. The return value must be a string
object.
This method differs from "object.__repr__()" in that there is no
expectation that "__str__()" return a valid Python expression: a
more convenient or concise representation can be used.
The default implementation defined by the built-in type "object"
calls "object.__repr__()".
object.__bytes__(self)
Called by bytes to compute a byte-string representation of an
object. This should return a "bytes" object.
object.__format__(self, format_spec)
Called by the "format()" built-in function, and by extension,
evaluation of formatted string literals and the "str.format()"
method, to produce a “formatted” string representation of an
object. The *format_spec* argument is a string that contains a
description of the formatting options desired. The interpretation
of the *format_spec* argument is up to the type implementing
"__format__()", however most classes will either delegate
formatting to one of the built-in types, or use a similar
formatting option syntax.
See Format Specification Mini-Language for a description of the
standard formatting syntax.
The return value must be a string object.
Changed in version 3.4: The __format__ method of "object" itself
raises a "TypeError" if passed any non-empty string.
Changed in version 3.7: "object.__format__(x, '')" is now
equivalent to "str(x)" rather than "format(str(self), '')".
object.__lt__(self, other)
object.__le__(self, other)
object.__eq__(self, other)
object.__ne__(self, other)
object.__gt__(self, other)
object.__ge__(self, other)
These are the so-called “rich comparison” methods. The
correspondence between operator symbols and method names is as
follows: "x<y" calls "x.__lt__(y)", "x<=y" calls "x.__le__(y)",
"x==y" calls "x.__eq__(y)", "x!=y" calls "x.__ne__(y)", "x>y" calls
"x.__gt__(y)", and "x>=y" calls "x.__ge__(y)".
A rich comparison method may return the singleton "NotImplemented"
if it does not implement the operation for a given pair of
arguments. By convention, "False" and "True" are returned for a
successful comparison. However, these methods can return any value,
so if the comparison operator is used in a Boolean context (e.g.,
in the condition of an "if" statement), Python will call "bool()"
on the value to determine if the result is true or false.
By default, "object" implements "__eq__()" by using "is", returning
"NotImplemented" in the case of a false comparison: "True if x is y
else NotImplemented". For "__ne__()", by default it delegates to
"__eq__()" and inverts the result unless it is "NotImplemented".
There are no other implied relationships among the comparison
operators or default implementations; for example, the truth of
"(x<y or x==y)" does not imply "x<=y". To automatically generate
ordering operations from a single root operation, see
"functools.total_ordering()".
See the paragraph on "__hash__()" for some important notes on
creating *hashable* objects which support custom comparison
operations and are usable as dictionary keys.
There are no swapped-argument versions of these methods (to be used
when the left argument does not support the operation but the right
argument does); rather, "__lt__()" and "__gt__()" are each other’s
reflection, "__le__()" and "__ge__()" are each other’s reflection,
and "__eq__()" and "__ne__()" are their own reflection. If the
operands are of different types, and right operand’s type is a
direct or indirect subclass of the left operand’s type, the
reflected method of the right operand has priority, otherwise the
left operand’s method has priority. Virtual subclassing is not
considered.
object.__hash__(self)
Called by built-in function "hash()" and for operations on members
of hashed collections including "set", "frozenset", and "dict".
"__hash__()" should return an integer. The only required property
is that objects which compare equal have the same hash value; it is
advised to mix together the hash values of the components of the
object that also play a part in comparison of objects by packing
them into a tuple and hashing the tuple. Example:
def __hash__(self):
return hash((self.name, self.nick, self.color))
Note:
"hash()" truncates the value returned from an object’s custom
"__hash__()" method to the size of a "Py_ssize_t". This is
typically 8 bytes on 64-bit builds and 4 bytes on 32-bit builds.
If an object’s "__hash__()" must interoperate on builds of
different bit sizes, be sure to check the width on all supported
builds. An easy way to do this is with "python -c "import sys;
print(sys.hash_info.width)"".
If a class does not define an "__eq__()" method it should not
define a "__hash__()" operation either; if it defines "__eq__()"
but not "__hash__()", its instances will not be usable as items in
hashable collections. If a class defines mutable objects and
implements an "__eq__()" method, it should not implement
"__hash__()", since the implementation of hashable collections
requires that a key’s hash value is immutable (if the object’s hash
value changes, it will be in the wrong hash bucket).
User-defined classes have "__eq__()" and "__hash__()" methods by
default; with them, all objects compare unequal (except with
themselves) and "x.__hash__()" returns an appropriate value such
that "x == y" implies both that "x is y" and "hash(x) == hash(y)".
A class that overrides "__eq__()" and does not define "__hash__()"
will have its "__hash__()" implicitly set to "None". When the
"__hash__()" method of a class is "None", instances of the class
will raise an appropriate "TypeError" when a program attempts to
retrieve their hash value, and will also be correctly identified as
unhashable when checking "isinstance(obj,
collections.abc.Hashable)".
If a class that overrides "__eq__()" needs to retain the
implementation of "__hash__()" from a parent class, the interpreter
must be told this explicitly by setting "__hash__ =
<ParentClass>.__hash__".
If a class that does not override "__eq__()" wishes to suppress
hash support, it should include "__hash__ = None" in the class
definition. A class which defines its own "__hash__()" that
explicitly raises a "TypeError" would be incorrectly identified as
hashable by an "isinstance(obj, collections.abc.Hashable)" call.
Note:
By default, the "__hash__()" values of str and bytes objects are
“salted” with an unpredictable random value. Although they
remain constant within an individual Python process, they are not
predictable between repeated invocations of Python.This is
intended to provide protection against a denial-of-service caused
by carefully-chosen inputs that exploit the worst case
performance of a dict insertion, O(n^2) complexity. See
http://www.ocert.org/advisories/ocert-2011-003.html for
details.Changing hash values affects the iteration order of sets.
Python has never made guarantees about this ordering (and it
typically varies between 32-bit and 64-bit builds).See also
"PYTHONHASHSEED".
Changed in version 3.3: Hash randomization is enabled by default.
object.__bool__(self)
Called to implement truth value testing and the built-in operation
"bool()"; should return "False" or "True". When this method is not
defined, "__len__()" is called, if it is defined, and the object is
considered true if its result is nonzero. If a class defines
neither "__len__()" nor "__bool__()", all its instances are
considered true.
Customizing attribute access
============================
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of "x.name") for
class instances.
object.__getattr__(self, name)
Called when the default attribute access fails with an
"AttributeError" (either "__getattribute__()" raises an
"AttributeError" because *name* is not an instance attribute or an
attribute in the class tree for "self"; or "__get__()" of a *name*
property raises "AttributeError"). This method should either
return the (computed) attribute value or raise an "AttributeError"
exception.
Note that if the attribute is found through the normal mechanism,
"__getattr__()" is not called. (This is an intentional asymmetry
between "__getattr__()" and "__setattr__()".) This is done both for
efficiency reasons and because otherwise "__getattr__()" would have
no way to access other attributes of the instance. Note that at
least for instance variables, you can fake total control by not
inserting any values in the instance attribute dictionary (but
instead inserting them in another object). See the
"__getattribute__()" method below for a way to actually get total
control over attribute access.
object.__getattribute__(self, name)
Called unconditionally to implement attribute accesses for
instances of the class. If the class also defines "__getattr__()",
the latter will not be called unless "__getattribute__()" either
calls it explicitly or raises an "AttributeError". This method
should return the (computed) attribute value or raise an
"AttributeError" exception. In order to avoid infinite recursion in
this method, its implementation should always call the base class
method with the same name to access any attributes it needs, for
example, "object.__getattribute__(self, name)".
Note:
This method may still be bypassed when looking up special methods
as the result of implicit invocation via language syntax or
built-in functions. See Special method lookup.
For certain sensitive attribute accesses, raises an auditing event
"object.__getattr__" with arguments "obj" and "name".
object.__setattr__(self, name, value)
Called when an attribute assignment is attempted. This is called
instead of the normal mechanism (i.e. store the value in the
instance dictionary). *name* is the attribute name, *value* is the
value to be assigned to it.
If "__setattr__()" wants to assign to an instance attribute, it
should call the base class method with the same name, for example,
"object.__setattr__(self, name, value)".
For certain sensitive attribute assignments, raises an auditing
event "object.__setattr__" with arguments "obj", "name", "value".
object.__delattr__(self, name)
Like "__setattr__()" but for attribute deletion instead of
assignment. This should only be implemented if "del obj.name" is
meaningful for the object.
For certain sensitive attribute deletions, raises an auditing event
"object.__delattr__" with arguments "obj" and "name".
object.__dir__(self)
Called when "dir()" is called on the object. A sequence must be
returned. "dir()" converts the returned sequence to a list and
sorts it.
Customizing module attribute access
-----------------------------------
Special names "__getattr__" and "__dir__" can be also used to
customize access to module attributes. The "__getattr__" function at
the module level should accept one argument which is the name of an
attribute and return the computed value or raise an "AttributeError".
If an attribute is not found on a module object through the normal
lookup, i.e. "object.__getattribute__()", then "__getattr__" is
searched in the module "__dict__" before raising an "AttributeError".
If found, it is called with the attribute name and the result is
returned.
The "__dir__" function should accept no arguments, and return a
sequence of strings that represents the names accessible on module. If
present, this function overrides the standard "dir()" search on a
module.
For a more fine grained customization of the module behavior (setting
attributes, properties, etc.), one can set the "__class__" attribute
of a module object to a subclass of "types.ModuleType". For example:
import sys
from types import ModuleType
class VerboseModule(ModuleType):
def __repr__(self):
return f'Verbose {self.__name__}'
def __setattr__(self, attr, value):
print(f'Setting {attr}...')
super().__setattr__(attr, value)
sys.modules[__name__].__class__ = VerboseModule
Note:
Defining module "__getattr__" and setting module "__class__" only
affect lookups made using the attribute access syntax – directly
accessing the module globals (whether by code within the module, or
via a reference to the module’s globals dictionary) is unaffected.
Changed in version 3.5: "__class__" module attribute is now writable.
New in version 3.7: "__getattr__" and "__dir__" module attributes.
See also:
**PEP 562** - Module __getattr__ and __dir__
Describes the "__getattr__" and "__dir__" functions on modules.
Implementing Descriptors
------------------------
The following methods only apply when an instance of the class
containing the method (a so-called *descriptor* class) appears in an
*owner* class (the descriptor must be in either the owner’s class
dictionary or in the class dictionary for one of its parents). In the
examples below, “the attribute” refers to the attribute whose name is
the key of the property in the owner class’ "__dict__".
object.__get__(self, instance, owner=None)
Called to get the attribute of the owner class (class attribute
access) or of an instance of that class (instance attribute
access). The optional *owner* argument is the owner class, while
*instance* is the instance that the attribute was accessed through,
or "None" when the attribute is accessed through the *owner*.
This method should return the computed attribute value or raise an
"AttributeError" exception.
**PEP 252** specifies that "__get__()" is callable with one or two
arguments. Python’s own built-in descriptors support this
specification; however, it is likely that some third-party tools
have descriptors that require both arguments. Python’s own
"__getattribute__()" implementation always passes in both arguments
whether they are required or not.
object.__set__(self, instance, value)
Called to set the attribute on an instance *instance* of the owner
class to a new value, *value*.
Note, adding "__set__()" or "__delete__()" changes the kind of
descriptor to a “data descriptor”. See Invoking Descriptors for
more details.
object.__delete__(self, instance)
Called to delete the attribute on an instance *instance* of the
owner class.
object.__set_name__(self, owner, name)
Called at the time the owning class *owner* is created. The
descriptor has been assigned to *name*.
Note:
"__set_name__()" is only called implicitly as part of the "type"
constructor, so it will need to be called explicitly with the
appropriate parameters when a descriptor is added to a class
after initial creation:
class A:
pass
descr = custom_descriptor()
A.attr = descr
descr.__set_name__(A, 'attr')
See Creating the class object for more details.
New in version 3.6.
The attribute "__objclass__" is interpreted by the "inspect" module as
specifying the class where this object was defined (setting this
appropriately can assist in runtime introspection of dynamic class
attributes). For callables, it may indicate that an instance of the
given type (or a subclass) is expected or required as the first
positional argument (for example, CPython sets this attribute for
unbound methods that are implemented in C).
Invoking Descriptors
--------------------
In general, a descriptor is an object attribute with “binding
behavior”, one whose attribute access has been overridden by methods
in the descriptor protocol: "__get__()", "__set__()", and
"__delete__()". If any of those methods are defined for an object, it
is said to be a descriptor.
The default behavior for attribute access is to get, set, or delete
the attribute from an object’s dictionary. For instance, "a.x" has a
lookup chain starting with "a.__dict__['x']", then
"type(a).__dict__['x']", and continuing through the base classes of
"type(a)" excluding metaclasses.
However, if the looked-up value is an object defining one of the
descriptor methods, then Python may override the default behavior and
invoke the descriptor method instead. Where this occurs in the
precedence chain depends on which descriptor methods were defined and
how they were called.
The starting point for descriptor invocation is a binding, "a.x". How
the arguments are assembled depends on "a":
Direct Call
The simplest and least common call is when user code directly
invokes a descriptor method: "x.__get__(a)".
Instance Binding
If binding to an object instance, "a.x" is transformed into the
call: "type(a).__dict__['x'].__get__(a, type(a))".
Class Binding
If binding to a class, "A.x" is transformed into the call:
"A.__dict__['x'].__get__(None, A)".
Super Binding
If "a" is an instance of "super", then the binding "super(B,
obj).m()" searches "obj.__class__.__mro__" for the base class "A"
immediately preceding "B" and then invokes the descriptor with the
call: "A.__dict__['m'].__get__(obj, obj.__class__)".
For instance bindings, the precedence of descriptor invocation depends
on which descriptor methods are defined. A descriptor can define any
combination of "__get__()", "__set__()" and "__delete__()". If it
does not define "__get__()", then accessing the attribute will return
the descriptor object itself unless there is a value in the object’s
instance dictionary. If the descriptor defines "__set__()" and/or
"__delete__()", it is a data descriptor; if it defines neither, it is
a non-data descriptor. Normally, data descriptors define both
"__get__()" and "__set__()", while non-data descriptors have just the
"__get__()" method. Data descriptors with "__set__()" and "__get__()"
defined always override a redefinition in an instance dictionary. In
contrast, non-data descriptors can be overridden by instances.
Python methods (including "staticmethod()" and "classmethod()") are
implemented as non-data descriptors. Accordingly, instances can
redefine and override methods. This allows individual instances to
acquire behaviors that differ from other instances of the same class.
The "property()" function is implemented as a data descriptor.
Accordingly, instances cannot override the behavior of a property.
__slots__
---------
*__slots__* allow us to explicitly declare data members (like
properties) and deny the creation of *__dict__* and *__weakref__*
(unless explicitly declared in *__slots__* or available in a parent.)
The space saved over using *__dict__* can be significant. Attribute
lookup speed can be significantly improved as well.
object.__slots__
This class variable can be assigned a string, iterable, or sequence
of strings with variable names used by instances. *__slots__*
reserves space for the declared variables and prevents the
automatic creation of *__dict__* and *__weakref__* for each
instance.
Notes on using *__slots__*
~~~~~~~~~~~~~~~~~~~~~~~~~~
* When inheriting from a class without *__slots__*, the *__dict__* and
*__weakref__* attribute of the instances will always be accessible.
* Without a *__dict__* variable, instances cannot be assigned new
variables not listed in the *__slots__* definition. Attempts to
assign to an unlisted variable name raises "AttributeError". If
dynamic assignment of new variables is desired, then add
"'__dict__'" to the sequence of strings in the *__slots__*
declaration.
* Without a *__weakref__* variable for each instance, classes defining
*__slots__* do not support weak references to its instances. If weak
reference support is needed, then add "'__weakref__'" to the
sequence of strings in the *__slots__* declaration.
* *__slots__* are implemented at the class level by creating
descriptors (Implementing Descriptors) for each variable name. As a
result, class attributes cannot be used to set default values for
instance variables defined by *__slots__*; otherwise, the class
attribute would overwrite the descriptor assignment.
* The action of a *__slots__* declaration is not limited to the class
where it is defined. *__slots__* declared in parents are available
in child classes. However, child subclasses will get a *__dict__*
and *__weakref__* unless they also define *__slots__* (which should
only contain names of any *additional* slots).
* If a class defines a slot also defined in a base class, the instance
variable defined by the base class slot is inaccessible (except by
retrieving its descriptor directly from the base class). This
renders the meaning of the program undefined. In the future, a
check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from
“variable-length” built-in types such as "int", "bytes" and "tuple".
* Any non-string iterable may be assigned to *__slots__*. Mappings may
also be used; however, in the future, special meaning may be
assigned to the values corresponding to each key.
* *__class__* assignment works only if both classes have the same
*__slots__*.
* Multiple inheritance with multiple slotted parent classes can be
used, but only one parent is allowed to have attributes created by
slots (the other bases must have empty slot layouts) - violations
raise "TypeError".
* If an iterator is used for *__slots__* then a descriptor is created
for each of the iterator’s values. However, the *__slots__*
attribute will be an empty iterator.
Customizing class creation
==========================
Whenever a class inherits from another class, *__init_subclass__* is
called on that class. This way, it is possible to write classes which
change the behavior of subclasses. This is closely related to class
decorators, but where class decorators only affect the specific class
they’re applied to, "__init_subclass__" solely applies to future
subclasses of the class defining the method.
classmethod object.__init_subclass__(cls)
This method is called whenever the containing class is subclassed.
*cls* is then the new subclass. If defined as a normal instance
method, this method is implicitly converted to a class method.
Keyword arguments which are given to a new class are passed to the
parent’s class "__init_subclass__". For compatibility with other
classes using "__init_subclass__", one should take out the needed
keyword arguments and pass the others over to the base class, as
in:
class Philosopher:
def __init_subclass__(cls, /, default_name, **kwargs):
super().__init_subclass__(**kwargs)
cls.default_name = default_name
class AustralianPhilosopher(Philosopher, default_name="Bruce"):
pass
The default implementation "object.__init_subclass__" does nothing,
but raises an error if it is called with any arguments.
Note:
The metaclass hint "metaclass" is consumed by the rest of the
type machinery, and is never passed to "__init_subclass__"
implementations. The actual metaclass (rather than the explicit
hint) can be accessed as "type(cls)".
New in version 3.6.
Metaclasses
-----------
By default, classes are constructed using "type()". The class body is
executed in a new namespace and the class name is bound locally to the
result of "type(name, bases, namespace)".
The class creation process can be customized by passing the
"metaclass" keyword argument in the class definition line, or by
inheriting from an existing class that included such an argument. In
the following example, both "MyClass" and "MySubclass" are instances
of "Meta":
class Meta(type):
pass
class MyClass(metaclass=Meta):
pass
class MySubclass(MyClass):
pass
Any other keyword arguments that are specified in the class definition
are passed through to all metaclass operations described below.
When a class definition is executed, the following steps occur:
* MRO entries are resolved;
* the appropriate metaclass is determined;
* the class namespace is prepared;
* the class body is executed;
* the class object is created.
Resolving MRO entries
---------------------
If a base that appears in class definition is not an instance of
"type", then an "__mro_entries__" method is searched on it. If found,
it is called with the original bases tuple. This method must return a
tuple of classes that will be used instead of this base. The tuple may
be empty, in such case the original base is ignored.
See also:
**PEP 560** - Core support for typing module and generic types
Determining the appropriate metaclass
-------------------------------------
The appropriate metaclass for a class definition is determined as
follows:
* if no bases and no explicit metaclass are given, then "type()" is
used;
* if an explicit metaclass is given and it is *not* an instance of
"type()", then it is used directly as the metaclass;
* if an instance of "type()" is given as the explicit metaclass, or
bases are defined, then the most derived metaclass is used.
The most derived metaclass is selected from the explicitly specified
metaclass (if any) and the metaclasses (i.e. "type(cls)") of all
specified base classes. The most derived metaclass is one which is a
subtype of *all* of these candidate metaclasses. If none of the
candidate metaclasses meets that criterion, then the class definition
will fail with "TypeError".
Preparing the class namespace
-----------------------------
Once the appropriate metaclass has been identified, then the class
namespace is prepared. If the metaclass has a "__prepare__" attribute,
it is called as "namespace = metaclass.__prepare__(name, bases,
**kwds)" (where the additional keyword arguments, if any, come from
the class definition). The "__prepare__" method should be implemented
as a "classmethod()". The namespace returned by "__prepare__" is
passed in to "__new__", but when the final class object is created the
namespace is copied into a new "dict".
If the metaclass has no "__prepare__" attribute, then the class
namespace is initialised as an empty ordered mapping.
See also:
**PEP 3115** - Metaclasses in Python 3000
Introduced the "__prepare__" namespace hook
Executing the class body
------------------------
The class body is executed (approximately) as "exec(body, globals(),
namespace)". The key difference from a normal call to "exec()" is that
lexical scoping allows the class body (including any methods) to
reference names from the current and outer scopes when the class
definition occurs inside a function.
However, even when the class definition occurs inside the function,
methods defined inside the class still cannot see names defined at the
class scope. Class variables must be accessed through the first
parameter of instance or class methods, or through the implicit
lexically scoped "__class__" reference described in the next section.
Creating the class object
-------------------------
Once the class namespace has been populated by executing the class
body, the class object is created by calling "metaclass(name, bases,
namespace, **kwds)" (the additional keywords passed here are the same
as those passed to "__prepare__").
This class object is the one that will be referenced by the zero-
argument form of "super()". "__class__" is an implicit closure
reference created by the compiler if any methods in a class body refer
to either "__class__" or "super". This allows the zero argument form
of "super()" to correctly identify the class being defined based on
lexical scoping, while the class or instance that was used to make the
current call is identified based on the first argument passed to the
method.
**CPython implementation detail:** In CPython 3.6 and later, the
"__class__" cell is passed to the metaclass as a "__classcell__" entry
in the class namespace. If present, this must be propagated up to the
"type.__new__" call in order for the class to be initialised
correctly. Failing to do so will result in a "RuntimeError" in Python
3.8.
When using the default metaclass "type", or any metaclass that
ultimately calls "type.__new__", the following additional
customisation steps are invoked after creating the class object:
* first, "type.__new__" collects all of the descriptors in the class
namespace that define a "__set_name__()" method;
* second, all of these "__set_name__" methods are called with the
class being defined and the assigned name of that particular
descriptor;
* finally, the "__init_subclass__()" hook is called on the immediate
parent of the new class in its method resolution order.
After the class object is created, it is passed to the class
decorators included in the class definition (if any) and the resulting
object is bound in the local namespace as the defined class.
When a new class is created by "type.__new__", the object provided as
the namespace parameter is copied to a new ordered mapping and the
original object is discarded. The new copy is wrapped in a read-only
proxy, which becomes the "__dict__" attribute of the class object.
See also:
**PEP 3135** - New super
Describes the implicit "__class__" closure reference
Uses for metaclasses
--------------------
The potential uses for metaclasses are boundless. Some ideas that have
been explored include enum, logging, interface checking, automatic
delegation, automatic property creation, proxies, frameworks, and
automatic resource locking/synchronization.
Customizing instance and subclass checks
========================================
The following methods are used to override the default behavior of the
"isinstance()" and "issubclass()" built-in functions.
In particular, the metaclass "abc.ABCMeta" implements these methods in
order to allow the addition of Abstract Base Classes (ABCs) as
“virtual base classes” to any class or type (including built-in
types), including other ABCs.
class.__instancecheck__(self, instance)
Return true if *instance* should be considered a (direct or
indirect) instance of *class*. If defined, called to implement
"isinstance(instance, class)".
class.__subclasscheck__(self, subclass)
Return true if *subclass* should be considered a (direct or
indirect) subclass of *class*. If defined, called to implement
"issubclass(subclass, class)".
Note that these methods are looked up on the type (metaclass) of a
class. They cannot be defined as class methods in the actual class.
This is consistent with the lookup of special methods that are called
on instances, only in this case the instance is itself a class.
See also:
**PEP 3119** - Introducing Abstract Base Classes
Includes the specification for customizing "isinstance()" and
"issubclass()" behavior through "__instancecheck__()" and
"__subclasscheck__()", with motivation for this functionality in
the context of adding Abstract Base Classes (see the "abc"
module) to the language.
Emulating generic types
=======================
One can implement the generic class syntax as specified by **PEP 484**
(for example "List[int]") by defining a special method:
classmethod object.__class_getitem__(cls, key)
Return an object representing the specialization of a generic class
by type arguments found in *key*.
This method is looked up on the class object itself, and when defined
in the class body, this method is implicitly a class method. Note,
this mechanism is primarily reserved for use with static type hints,
other usage is discouraged.
See also:
**PEP 560** - Core support for typing module and generic types
Emulating callable objects
==========================
object.__call__(self[, args...])
Called when the instance is “called” as a function; if this method
is defined, "x(arg1, arg2, ...)" roughly translates to
"type(x).__call__(x, arg1, ...)".
Emulating container types
=========================
The following methods can be defined to implement container objects.
Containers usually are sequences (such as lists or tuples) or mappings
(like dictionaries), but can represent other containers as well. The
first set of methods is used either to emulate a sequence or to
emulate a mapping; the difference is that for a sequence, the
allowable keys should be the integers *k* for which "0 <= k < N" where
*N* is the length of the sequence, or slice objects, which define a
range of items. It is also recommended that mappings provide the
methods "keys()", "values()", "items()", "get()", "clear()",
"setdefault()", "pop()", "popitem()", "copy()", and "update()"
behaving similar to those for Python’s standard dictionary objects.
The "collections.abc" module provides a "MutableMapping" abstract base
class to help create those methods from a base set of "__getitem__()",
"__setitem__()", "__delitem__()", and "keys()". Mutable sequences
should provide methods "append()", "count()", "index()", "extend()",
"insert()", "pop()", "remove()", "reverse()" and "sort()", like Python
standard list objects. Finally, sequence types should implement
addition (meaning concatenation) and multiplication (meaning
repetition) by defining the methods "__add__()", "__radd__()",
"__iadd__()", "__mul__()", "__rmul__()" and "__imul__()" described
below; they should not define other numerical operators. It is
recommended that both mappings and sequences implement the
"__contains__()" method to allow efficient use of the "in" operator;
for mappings, "in" should search the mapping’s keys; for sequences, it
should search through the values. It is further recommended that both
mappings and sequences implement the "__iter__()" method to allow
efficient iteration through the container; for mappings, "__iter__()"
should iterate through the object’s keys; for sequences, it should
iterate through the values.
object.__len__(self)
Called to implement the built-in function "len()". Should return
the length of the object, an integer ">=" 0. Also, an object that
doesn’t define a "__bool__()" method and whose "__len__()" method
returns zero is considered to be false in a Boolean context.
**CPython implementation detail:** In CPython, the length is
required to be at most "sys.maxsize". If the length is larger than
"sys.maxsize" some features (such as "len()") may raise
"OverflowError". To prevent raising "OverflowError" by truth value
testing, an object must define a "__bool__()" method.
object.__length_hint__(self)
Called to implement "operator.length_hint()". Should return an
estimated length for the object (which may be greater or less than
the actual length). The length must be an integer ">=" 0. The
return value may also be "NotImplemented", which is treated the
same as if the "__length_hint__" method didn’t exist at all. This
method is purely an optimization and is never required for
correctness.
New in version 3.4.
Note:
Slicing is done exclusively with the following three methods. A
call like
a[1:2] = b
is translated to
a[slice(1, 2, None)] = b
and so forth. Missing slice items are always filled in with "None".
object.__getitem__(self, key)
Called to implement evaluation of "self[key]". For sequence types,
the accepted keys should be integers and slice objects. Note that
the special interpretation of negative indexes (if the class wishes
to emulate a sequence type) is up to the "__getitem__()" method. If
*key* is of an inappropriate type, "TypeError" may be raised; if of
a value outside the set of indexes for the sequence (after any
special interpretation of negative values), "IndexError" should be
raised. For mapping types, if *key* is missing (not in the
container), "KeyError" should be raised.
Note:
"for" loops expect that an "IndexError" will be raised for
illegal indexes to allow proper detection of the end of the
sequence.
object.__setitem__(self, key, value)
Called to implement assignment to "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support changes to the values for keys, or if new keys
can be added, or for sequences if elements can be replaced. The
same exceptions should be raised for improper *key* values as for
the "__getitem__()" method.
object.__delitem__(self, key)
Called to implement deletion of "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support removal of keys, or for sequences if elements
can be removed from the sequence. The same exceptions should be
raised for improper *key* values as for the "__getitem__()" method.
object.__missing__(self, key)
Called by "dict"."__getitem__()" to implement "self[key]" for dict
subclasses when key is not in the dictionary.
object.__iter__(self)
This method is called when an iterator is required for a container.
This method should return a new iterator object that can iterate
over all the objects in the container. For mappings, it should
iterate over the keys of the container.
Iterator objects also need to implement this method; they are
required to return themselves. For more information on iterator
objects, see Iterator Types.
object.__reversed__(self)
Called (if present) by the "reversed()" built-in to implement
reverse iteration. It should return a new iterator object that
iterates over all the objects in the container in reverse order.
If the "__reversed__()" method is not provided, the "reversed()"
built-in will fall back to using the sequence protocol ("__len__()"
and "__getitem__()"). Objects that support the sequence protocol
should only provide "__reversed__()" if they can provide an
implementation that is more efficient than the one provided by
"reversed()".
The membership test operators ("in" and "not in") are normally
implemented as an iteration through a container. However, container
objects can supply the following special method with a more efficient
implementation, which also does not require the object be iterable.
object.__contains__(self, item)
Called to implement membership test operators. Should return true
if *item* is in *self*, false otherwise. For mapping objects, this
should consider the keys of the mapping rather than the values or
the key-item pairs.
For objects that don’t define "__contains__()", the membership test
first tries iteration via "__iter__()", then the old sequence
iteration protocol via "__getitem__()", see this section in the
language reference.
Emulating numeric types
=======================
The following methods can be defined to emulate numeric objects.
Methods corresponding to operations that are not supported by the
particular kind of number implemented (e.g., bitwise operations for
non-integral numbers) should be left undefined.
object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__matmul__(self, other)
object.__truediv__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|"). For instance, to
evaluate the expression "x + y", where *x* is an instance of a
class that has an "__add__()" method, "x.__add__(y)" is called.
The "__divmod__()" method should be the equivalent to using
"__floordiv__()" and "__mod__()"; it should not be related to
"__truediv__()". Note that "__pow__()" should be defined to accept
an optional third argument if the ternary version of the built-in
"pow()" function is to be supported.
If one of those methods does not support the operation with the
supplied arguments, it should return "NotImplemented".
object.__radd__(self, other)
object.__rsub__(self, other)
object.__rmul__(self, other)
object.__rmatmul__(self, other)
object.__rtruediv__(self, other)
object.__rfloordiv__(self, other)
object.__rmod__(self, other)
object.__rdivmod__(self, other)
object.__rpow__(self, other[, modulo])
object.__rlshift__(self, other)
object.__rrshift__(self, other)
object.__rand__(self, other)
object.__rxor__(self, other)
object.__ror__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|") with reflected (swapped)
operands. These functions are only called if the left operand does
not support the corresponding operation [3] and the operands are of
different types. [4] For instance, to evaluate the expression "x -
y", where *y* is an instance of a class that has an "__rsub__()"
method, "y.__rsub__(x)" is called if "x.__sub__(y)" returns
*NotImplemented*.
Note that ternary "pow()" will not try calling "__rpow__()" (the
coercion rules would become too complicated).
Note:
If the right operand’s type is a subclass of the left operand’s
type and that subclass provides a different implementation of the
reflected method for the operation, this method will be called
before the left operand’s non-reflected method. This behavior
allows subclasses to override their ancestors’ operations.
object.__iadd__(self, other)
object.__isub__(self, other)
object.__imul__(self, other)
object.__imatmul__(self, other)
object.__itruediv__(self, other)
object.__ifloordiv__(self, other)
object.__imod__(self, other)
object.__ipow__(self, other[, modulo])
object.__ilshift__(self, other)
object.__irshift__(self, other)
object.__iand__(self, other)
object.__ixor__(self, other)
object.__ior__(self, other)
These methods are called to implement the augmented arithmetic
assignments ("+=", "-=", "*=", "@=", "/=", "//=", "%=", "**=",
"<<=", ">>=", "&=", "^=", "|="). These methods should attempt to
do the operation in-place (modifying *self*) and return the result
(which could be, but does not have to be, *self*). If a specific
method is not defined, the augmented assignment falls back to the
normal methods. For instance, if *x* is an instance of a class
with an "__iadd__()" method, "x += y" is equivalent to "x =
x.__iadd__(y)" . Otherwise, "x.__add__(y)" and "y.__radd__(x)" are
considered, as with the evaluation of "x + y". In certain
situations, augmented assignment can result in unexpected errors
(see Why does a_tuple[i] += [‘item’] raise an exception when the
addition works?), but this behavior is in fact part of the data
model.
Note:
Due to a bug in the dispatching mechanism for "**=", a class that
defines "__ipow__()" but returns "NotImplemented" would fail to
fall back to "x.__pow__(y)" and "y.__rpow__(x)". This bug is
fixed in Python 3.10.
object.__neg__(self)
object.__pos__(self)
object.__abs__(self)
object.__invert__(self)
Called to implement the unary arithmetic operations ("-", "+",
"abs()" and "~").
object.__complex__(self)
object.__int__(self)
object.__float__(self)
Called to implement the built-in functions "complex()", "int()" and
"float()". Should return a value of the appropriate type.
object.__index__(self)
Called to implement "operator.index()", and whenever Python needs
to losslessly convert the numeric object to an integer object (such
as in slicing, or in the built-in "bin()", "hex()" and "oct()"
functions). Presence of this method indicates that the numeric
object is an integer type. Must return an integer.
If "__int__()", "__float__()" and "__complex__()" are not defined
then corresponding built-in functions "int()", "float()" and
"complex()" fall back to "__index__()".
object.__round__(self[, ndigits])
object.__trunc__(self)
object.__floor__(self)
object.__ceil__(self)
Called to implement the built-in function "round()" and "math"
functions "trunc()", "floor()" and "ceil()". Unless *ndigits* is
passed to "__round__()" all these methods should return the value
of the object truncated to an "Integral" (typically an "int").
The built-in function "int()" falls back to "__trunc__()" if
neither "__int__()" nor "__index__()" is defined.
With Statement Context Managers
===============================
A *context manager* is an object that defines the runtime context to
be established when executing a "with" statement. The context manager
handles the entry into, and the exit from, the desired runtime context
for the execution of the block of code. Context managers are normally
invoked using the "with" statement (described in section The with
statement), but can also be used by directly invoking their methods.
Typical uses of context managers include saving and restoring various
kinds of global state, locking and unlocking resources, closing opened
files, etc.
For more information on context managers, see Context Manager Types.
object.__enter__(self)
Enter the runtime context related to this object. The "with"
statement will bind this method’s return value to the target(s)
specified in the "as" clause of the statement, if any.
object.__exit__(self, exc_type, exc_value, traceback)
Exit the runtime context related to this object. The parameters
describe the exception that caused the context to be exited. If the
context was exited without an exception, all three arguments will
be "None".
If an exception is supplied, and the method wishes to suppress the
exception (i.e., prevent it from being propagated), it should
return a true value. Otherwise, the exception will be processed
normally upon exit from this method.
Note that "__exit__()" methods should not reraise the passed-in
exception; this is the caller’s responsibility.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
Special method lookup
=====================
For custom classes, implicit invocations of special methods are only
guaranteed to work correctly if defined on an object’s type, not in
the object’s instance dictionary. That behaviour is the reason why
the following code raises an exception:
>>> class C:
... pass
...
>>> c = C()
>>> c.__len__ = lambda: 5
>>> len(c)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: object of type 'C' has no len()
The rationale behind this behaviour lies with a number of special
methods such as "__hash__()" and "__repr__()" that are implemented by
all objects, including type objects. If the implicit lookup of these
methods used the conventional lookup process, they would fail when
invoked on the type object itself:
>>> 1 .__hash__() == hash(1)
True
>>> int.__hash__() == hash(int)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: descriptor '__hash__' of 'int' object needs an argument
Incorrectly attempting to invoke an unbound method of a class in this
way is sometimes referred to as ‘metaclass confusion’, and is avoided
by bypassing the instance when looking up special methods:
>>> type(1).__hash__(1) == hash(1)
True
>>> type(int).__hash__(int) == hash(int)
True
In addition to bypassing any instance attributes in the interest of
correctness, implicit special method lookup generally also bypasses
the "__getattribute__()" method even of the object’s metaclass:
>>> class Meta(type):
... def __getattribute__(*args):
... print("Metaclass getattribute invoked")
... return type.__getattribute__(*args)
...
>>> class C(object, metaclass=Meta):
... def __len__(self):
... return 10
... def __getattribute__(*args):
... print("Class getattribute invoked")
... return object.__getattribute__(*args)
...
>>> c = C()
>>> c.__len__() # Explicit lookup via instance
Class getattribute invoked
10
>>> type(c).__len__(c) # Explicit lookup via type
Metaclass getattribute invoked
10
>>> len(c) # Implicit lookup
10
Bypassing the "__getattribute__()" machinery in this fashion provides
significant scope for speed optimisations within the interpreter, at
the cost of some flexibility in the handling of special methods (the
special method *must* be set on the class object itself in order to be
consistently invoked by the interpreter).
u�Y String Methods
**************
Strings implement all of the common sequence operations, along with
the additional methods described below.
Strings also support two styles of string formatting, one providing a
large degree of flexibility and customization (see "str.format()",
Format String Syntax and Custom String Formatting) and the other based
on C "printf" style formatting that handles a narrower range of types
and is slightly harder to use correctly, but is often faster for the
cases it can handle (printf-style String Formatting).
The Text Processing Services section of the standard library covers a
number of other modules that provide various text related utilities
(including regular expression support in the "re" module).
str.capitalize()
Return a copy of the string with its first character capitalized
and the rest lowercased.
Changed in version 3.8: The first character is now put into
titlecase rather than uppercase. This means that characters like
digraphs will only have their first letter capitalized, instead of
the full character.
str.casefold()
Return a casefolded copy of the string. Casefolded strings may be
used for caseless matching.
Casefolding is similar to lowercasing but more aggressive because
it is intended to remove all case distinctions in a string. For
example, the German lowercase letter "'ß'" is equivalent to ""ss"".
Since it is already lowercase, "lower()" would do nothing to "'ß'";
"casefold()" converts it to ""ss"".
The casefolding algorithm is described in section 3.13 of the
Unicode Standard.
New in version 3.3.
str.center(width[, fillchar])
Return centered in a string of length *width*. Padding is done
using the specified *fillchar* (default is an ASCII space). The
original string is returned if *width* is less than or equal to
"len(s)".
str.count(sub[, start[, end]])
Return the number of non-overlapping occurrences of substring *sub*
in the range [*start*, *end*]. Optional arguments *start* and
*end* are interpreted as in slice notation.
str.encode(encoding="utf-8", errors="strict")
Return an encoded version of the string as a bytes object. Default
encoding is "'utf-8'". *errors* may be given to set a different
error handling scheme. The default for *errors* is "'strict'",
meaning that encoding errors raise a "UnicodeError". Other possible
values are "'ignore'", "'replace'", "'xmlcharrefreplace'",
"'backslashreplace'" and any other name registered via
"codecs.register_error()", see section Error Handlers. For a list
of possible encodings, see section Standard Encodings.
Changed in version 3.1: Support for keyword arguments added.
str.endswith(suffix[, start[, end]])
Return "True" if the string ends with the specified *suffix*,
otherwise return "False". *suffix* can also be a tuple of suffixes
to look for. With optional *start*, test beginning at that
position. With optional *end*, stop comparing at that position.
str.expandtabs(tabsize=8)
Return a copy of the string where all tab characters are replaced
by one or more spaces, depending on the current column and the
given tab size. Tab positions occur every *tabsize* characters
(default is 8, giving tab positions at columns 0, 8, 16 and so on).
To expand the string, the current column is set to zero and the
string is examined character by character. If the character is a
tab ("\t"), one or more space characters are inserted in the result
until the current column is equal to the next tab position. (The
tab character itself is not copied.) If the character is a newline
("\n") or return ("\r"), it is copied and the current column is
reset to zero. Any other character is copied unchanged and the
current column is incremented by one regardless of how the
character is represented when printed.
>>> '01\t012\t0123\t01234'.expandtabs()
'01 012 0123 01234'
>>> '01\t012\t0123\t01234'.expandtabs(4)
'01 012 0123 01234'
str.find(sub[, start[, end]])
Return the lowest index in the string where substring *sub* is
found within the slice "s[start:end]". Optional arguments *start*
and *end* are interpreted as in slice notation. Return "-1" if
*sub* is not found.
Note:
The "find()" method should be used only if you need to know the
position of *sub*. To check if *sub* is a substring or not, use
the "in" operator:
>>> 'Py' in 'Python'
True
str.format(*args, **kwargs)
Perform a string formatting operation. The string on which this
method is called can contain literal text or replacement fields
delimited by braces "{}". Each replacement field contains either
the numeric index of a positional argument, or the name of a
keyword argument. Returns a copy of the string where each
replacement field is replaced with the string value of the
corresponding argument.
>>> "The sum of 1 + 2 is {0}".format(1+2)
'The sum of 1 + 2 is 3'
See Format String Syntax for a description of the various
formatting options that can be specified in format strings.
Note:
When formatting a number ("int", "float", "complex",
"decimal.Decimal" and subclasses) with the "n" type (ex:
"'{:n}'.format(1234)"), the function temporarily sets the
"LC_CTYPE" locale to the "LC_NUMERIC" locale to decode
"decimal_point" and "thousands_sep" fields of "localeconv()" if
they are non-ASCII or longer than 1 byte, and the "LC_NUMERIC"
locale is different than the "LC_CTYPE" locale. This temporary
change affects other threads.
Changed in version 3.7: When formatting a number with the "n" type,
the function sets temporarily the "LC_CTYPE" locale to the
"LC_NUMERIC" locale in some cases.
str.format_map(mapping)
Similar to "str.format(**mapping)", except that "mapping" is used
directly and not copied to a "dict". This is useful if for example
"mapping" is a dict subclass:
>>> class Default(dict):
... def __missing__(self, key):
... return key
...
>>> '{name} was born in {country}'.format_map(Default(name='Guido'))
'Guido was born in country'
New in version 3.2.
str.index(sub[, start[, end]])
Like "find()", but raise "ValueError" when the substring is not
found.
str.isalnum()
Return "True" if all characters in the string are alphanumeric and
there is at least one character, "False" otherwise. A character
"c" is alphanumeric if one of the following returns "True":
"c.isalpha()", "c.isdecimal()", "c.isdigit()", or "c.isnumeric()".
str.isalpha()
Return "True" if all characters in the string are alphabetic and
there is at least one character, "False" otherwise. Alphabetic
characters are those characters defined in the Unicode character
database as “Letter”, i.e., those with general category property
being one of “Lm”, “Lt”, “Lu”, “Ll”, or “Lo”. Note that this is
different from the “Alphabetic” property defined in the Unicode
Standard.
str.isascii()
Return "True" if the string is empty or all characters in the
string are ASCII, "False" otherwise. ASCII characters have code
points in the range U+0000-U+007F.
New in version 3.7.
str.isdecimal()
Return "True" if all characters in the string are decimal
characters and there is at least one character, "False" otherwise.
Decimal characters are those that can be used to form numbers in
base 10, e.g. U+0660, ARABIC-INDIC DIGIT ZERO. Formally a decimal
character is a character in the Unicode General Category “Nd”.
str.isdigit()
Return "True" if all characters in the string are digits and there
is at least one character, "False" otherwise. Digits include
decimal characters and digits that need special handling, such as
the compatibility superscript digits. This covers digits which
cannot be used to form numbers in base 10, like the Kharosthi
numbers. Formally, a digit is a character that has the property
value Numeric_Type=Digit or Numeric_Type=Decimal.
str.isidentifier()
Return "True" if the string is a valid identifier according to the
language definition, section Identifiers and keywords.
Call "keyword.iskeyword()" to test whether string "s" is a reserved
identifier, such as "def" and "class".
Example:
>>> from keyword import iskeyword
>>> 'hello'.isidentifier(), iskeyword('hello')
True, False
>>> 'def'.isidentifier(), iskeyword('def')
True, True
str.islower()
Return "True" if all cased characters [4] in the string are
lowercase and there is at least one cased character, "False"
otherwise.
str.isnumeric()
Return "True" if all characters in the string are numeric
characters, and there is at least one character, "False" otherwise.
Numeric characters include digit characters, and all characters
that have the Unicode numeric value property, e.g. U+2155, VULGAR
FRACTION ONE FIFTH. Formally, numeric characters are those with
the property value Numeric_Type=Digit, Numeric_Type=Decimal or
Numeric_Type=Numeric.
str.isprintable()
Return "True" if all characters in the string are printable or the
string is empty, "False" otherwise. Nonprintable characters are
those characters defined in the Unicode character database as
“Other” or “Separator”, excepting the ASCII space (0x20) which is
considered printable. (Note that printable characters in this
context are those which should not be escaped when "repr()" is
invoked on a string. It has no bearing on the handling of strings
written to "sys.stdout" or "sys.stderr".)
str.isspace()
Return "True" if there are only whitespace characters in the string
and there is at least one character, "False" otherwise.
A character is *whitespace* if in the Unicode character database
(see "unicodedata"), either its general category is "Zs"
(“Separator, space”), or its bidirectional class is one of "WS",
"B", or "S".
str.istitle()
Return "True" if the string is a titlecased string and there is at
least one character, for example uppercase characters may only
follow uncased characters and lowercase characters only cased ones.
Return "False" otherwise.
str.isupper()
Return "True" if all cased characters [4] in the string are
uppercase and there is at least one cased character, "False"
otherwise.
str.join(iterable)
Return a string which is the concatenation of the strings in
*iterable*. A "TypeError" will be raised if there are any non-
string values in *iterable*, including "bytes" objects. The
separator between elements is the string providing this method.
str.ljust(width[, fillchar])
Return the string left justified in a string of length *width*.
Padding is done using the specified *fillchar* (default is an ASCII
space). The original string is returned if *width* is less than or
equal to "len(s)".
str.lower()
Return a copy of the string with all the cased characters [4]
converted to lowercase.
The lowercasing algorithm used is described in section 3.13 of the
Unicode Standard.
str.lstrip([chars])
Return a copy of the string with leading characters removed. The
*chars* argument is a string specifying the set of characters to be
removed. If omitted or "None", the *chars* argument defaults to
removing whitespace. The *chars* argument is not a prefix; rather,
all combinations of its values are stripped:
>>> ' spacious '.lstrip()
'spacious '
>>> 'www.example.com'.lstrip('cmowz.')
'example.com'
static str.maketrans(x[, y[, z]])
This static method returns a translation table usable for
"str.translate()".
If there is only one argument, it must be a dictionary mapping
Unicode ordinals (integers) or characters (strings of length 1) to
Unicode ordinals, strings (of arbitrary lengths) or "None".
Character keys will then be converted to ordinals.
If there are two arguments, they must be strings of equal length,
and in the resulting dictionary, each character in x will be mapped
to the character at the same position in y. If there is a third
argument, it must be a string, whose characters will be mapped to
"None" in the result.
str.partition(sep)
Split the string at the first occurrence of *sep*, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator. If the separator is not
found, return a 3-tuple containing the string itself, followed by
two empty strings.
str.replace(old, new[, count])
Return a copy of the string with all occurrences of substring *old*
replaced by *new*. If the optional argument *count* is given, only
the first *count* occurrences are replaced.
str.rfind(sub[, start[, end]])
Return the highest index in the string where substring *sub* is
found, such that *sub* is contained within "s[start:end]".
Optional arguments *start* and *end* are interpreted as in slice
notation. Return "-1" on failure.
str.rindex(sub[, start[, end]])
Like "rfind()" but raises "ValueError" when the substring *sub* is
not found.
str.rjust(width[, fillchar])
Return the string right justified in a string of length *width*.
Padding is done using the specified *fillchar* (default is an ASCII
space). The original string is returned if *width* is less than or
equal to "len(s)".
str.rpartition(sep)
Split the string at the last occurrence of *sep*, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator. If the separator is not
found, return a 3-tuple containing two empty strings, followed by
the string itself.
str.rsplit(sep=None, maxsplit=-1)
Return a list of the words in the string, using *sep* as the
delimiter string. If *maxsplit* is given, at most *maxsplit* splits
are done, the *rightmost* ones. If *sep* is not specified or
"None", any whitespace string is a separator. Except for splitting
from the right, "rsplit()" behaves like "split()" which is
described in detail below.
str.rstrip([chars])
Return a copy of the string with trailing characters removed. The
*chars* argument is a string specifying the set of characters to be
removed. If omitted or "None", the *chars* argument defaults to
removing whitespace. The *chars* argument is not a suffix; rather,
all combinations of its values are stripped:
>>> ' spacious '.rstrip()
' spacious'
>>> 'mississippi'.rstrip('ipz')
'mississ'
str.split(sep=None, maxsplit=-1)
Return a list of the words in the string, using *sep* as the
delimiter string. If *maxsplit* is given, at most *maxsplit*
splits are done (thus, the list will have at most "maxsplit+1"
elements). If *maxsplit* is not specified or "-1", then there is
no limit on the number of splits (all possible splits are made).
If *sep* is given, consecutive delimiters are not grouped together
and are deemed to delimit empty strings (for example,
"'1,,2'.split(',')" returns "['1', '', '2']"). The *sep* argument
may consist of multiple characters (for example,
"'1<>2<>3'.split('<>')" returns "['1', '2', '3']"). Splitting an
empty string with a specified separator returns "['']".
For example:
>>> '1,2,3'.split(',')
['1', '2', '3']
>>> '1,2,3'.split(',', maxsplit=1)
['1', '2,3']
>>> '1,2,,3,'.split(',')
['1', '2', '', '3', '']
If *sep* is not specified or is "None", a different splitting
algorithm is applied: runs of consecutive whitespace are regarded
as a single separator, and the result will contain no empty strings
at the start or end if the string has leading or trailing
whitespace. Consequently, splitting an empty string or a string
consisting of just whitespace with a "None" separator returns "[]".
For example:
>>> '1 2 3'.split()
['1', '2', '3']
>>> '1 2 3'.split(maxsplit=1)
['1', '2 3']
>>> ' 1 2 3 '.split()
['1', '2', '3']
str.splitlines([keepends])
Return a list of the lines in the string, breaking at line
boundaries. Line breaks are not included in the resulting list
unless *keepends* is given and true.
This method splits on the following line boundaries. In
particular, the boundaries are a superset of *universal newlines*.
+-------------------------+-------------------------------+
| Representation | Description |
|=========================|===============================|
| "\n" | Line Feed |
+-------------------------+-------------------------------+
| "\r" | Carriage Return |
+-------------------------+-------------------------------+
| "\r\n" | Carriage Return + Line Feed |
+-------------------------+-------------------------------+
| "\v" or "\x0b" | Line Tabulation |
+-------------------------+-------------------------------+
| "\f" or "\x0c" | Form Feed |
+-------------------------+-------------------------------+
| "\x1c" | File Separator |
+-------------------------+-------------------------------+
| "\x1d" | Group Separator |
+-------------------------+-------------------------------+
| "\x1e" | Record Separator |
+-------------------------+-------------------------------+
| "\x85" | Next Line (C1 Control Code) |
+-------------------------+-------------------------------+
| "\u2028" | Line Separator |
+-------------------------+-------------------------------+
| "\u2029" | Paragraph Separator |
+-------------------------+-------------------------------+
Changed in version 3.2: "\v" and "\f" added to list of line
boundaries.
For example:
>>> 'ab c\n\nde fg\rkl\r\n'.splitlines()
['ab c', '', 'de fg', 'kl']
>>> 'ab c\n\nde fg\rkl\r\n'.splitlines(keepends=True)
['ab c\n', '\n', 'de fg\r', 'kl\r\n']
Unlike "split()" when a delimiter string *sep* is given, this
method returns an empty list for the empty string, and a terminal
line break does not result in an extra line:
>>> "".splitlines()
[]
>>> "One line\n".splitlines()
['One line']
For comparison, "split('\n')" gives:
>>> ''.split('\n')
['']
>>> 'Two lines\n'.split('\n')
['Two lines', '']
str.startswith(prefix[, start[, end]])
Return "True" if string starts with the *prefix*, otherwise return
"False". *prefix* can also be a tuple of prefixes to look for.
With optional *start*, test string beginning at that position.
With optional *end*, stop comparing string at that position.
str.strip([chars])
Return a copy of the string with the leading and trailing
characters removed. The *chars* argument is a string specifying the
set of characters to be removed. If omitted or "None", the *chars*
argument defaults to removing whitespace. The *chars* argument is
not a prefix or suffix; rather, all combinations of its values are
stripped:
>>> ' spacious '.strip()
'spacious'
>>> 'www.example.com'.strip('cmowz.')
'example'
The outermost leading and trailing *chars* argument values are
stripped from the string. Characters are removed from the leading
end until reaching a string character that is not contained in the
set of characters in *chars*. A similar action takes place on the
trailing end. For example:
>>> comment_string = '#....... Section 3.2.1 Issue #32 .......'
>>> comment_string.strip('.#! ')
'Section 3.2.1 Issue #32'
str.swapcase()
Return a copy of the string with uppercase characters converted to
lowercase and vice versa. Note that it is not necessarily true that
"s.swapcase().swapcase() == s".
str.title()
Return a titlecased version of the string where words start with an
uppercase character and the remaining characters are lowercase.
For example:
>>> 'Hello world'.title()
'Hello World'
The algorithm uses a simple language-independent definition of a
word as groups of consecutive letters. The definition works in
many contexts but it means that apostrophes in contractions and
possessives form word boundaries, which may not be the desired
result:
>>> "they're bill's friends from the UK".title()
"They'Re Bill'S Friends From The Uk"
A workaround for apostrophes can be constructed using regular
expressions:
>>> import re
>>> def titlecase(s):
... return re.sub(r"[A-Za-z]+('[A-Za-z]+)?",
... lambda mo: mo.group(0).capitalize(),
... s)
...
>>> titlecase("they're bill's friends.")
"They're Bill's Friends."
str.translate(table)
Return a copy of the string in which each character has been mapped
through the given translation table. The table must be an object
that implements indexing via "__getitem__()", typically a *mapping*
or *sequence*. When indexed by a Unicode ordinal (an integer), the
table object can do any of the following: return a Unicode ordinal
or a string, to map the character to one or more other characters;
return "None", to delete the character from the return string; or
raise a "LookupError" exception, to map the character to itself.
You can use "str.maketrans()" to create a translation map from
character-to-character mappings in different formats.
See also the "codecs" module for a more flexible approach to custom
character mappings.
str.upper()
Return a copy of the string with all the cased characters [4]
converted to uppercase. Note that "s.upper().isupper()" might be
"False" if "s" contains uncased characters or if the Unicode
category of the resulting character(s) is not “Lu” (Letter,
uppercase), but e.g. “Lt” (Letter, titlecase).
The uppercasing algorithm used is described in section 3.13 of the
Unicode Standard.
str.zfill(width)
Return a copy of the string left filled with ASCII "'0'" digits to
make a string of length *width*. A leading sign prefix
("'+'"/"'-'") is handled by inserting the padding *after* the sign
character rather than before. The original string is returned if
*width* is less than or equal to "len(s)".
For example:
>>> "42".zfill(5)
'00042'
>>> "-42".zfill(5)
'-0042'
u� String and Bytes literals
*************************
String literals are described by the following lexical definitions:
stringliteral ::= [stringprefix](shortstring | longstring)
stringprefix ::= "r" | "u" | "R" | "U" | "f" | "F"
| "fr" | "Fr" | "fR" | "FR" | "rf" | "rF" | "Rf" | "RF"
shortstring ::= "'" shortstringitem* "'" | '"' shortstringitem* '"'
longstring ::= "'''" longstringitem* "'''" | '"""' longstringitem* '"""'
shortstringitem ::= shortstringchar | stringescapeseq
longstringitem ::= longstringchar | stringescapeseq
shortstringchar ::= <any source character except "\" or newline or the quote>
longstringchar ::= <any source character except "\">
stringescapeseq ::= "\" <any source character>
bytesliteral ::= bytesprefix(shortbytes | longbytes)
bytesprefix ::= "b" | "B" | "br" | "Br" | "bR" | "BR" | "rb" | "rB" | "Rb" | "RB"
shortbytes ::= "'" shortbytesitem* "'" | '"' shortbytesitem* '"'
longbytes ::= "'''" longbytesitem* "'''" | '"""' longbytesitem* '"""'
shortbytesitem ::= shortbyteschar | bytesescapeseq
longbytesitem ::= longbyteschar | bytesescapeseq
shortbyteschar ::= <any ASCII character except "\" or newline or the quote>
longbyteschar ::= <any ASCII character except "\">
bytesescapeseq ::= "\" <any ASCII character>
One syntactic restriction not indicated by these productions is that
whitespace is not allowed between the "stringprefix" or "bytesprefix"
and the rest of the literal. The source character set is defined by
the encoding declaration; it is UTF-8 if no encoding declaration is
given in the source file; see section Encoding declarations.
In plain English: Both types of literals can be enclosed in matching
single quotes ("'") or double quotes ("""). They can also be enclosed
in matching groups of three single or double quotes (these are
generally referred to as *triple-quoted strings*). The backslash
("\") character is used to escape characters that otherwise have a
special meaning, such as newline, backslash itself, or the quote
character.
Bytes literals are always prefixed with "'b'" or "'B'"; they produce
an instance of the "bytes" type instead of the "str" type. They may
only contain ASCII characters; bytes with a numeric value of 128 or
greater must be expressed with escapes.
Both string and bytes literals may optionally be prefixed with a
letter "'r'" or "'R'"; such strings are called *raw strings* and treat
backslashes as literal characters. As a result, in string literals,
"'\U'" and "'\u'" escapes in raw strings are not treated specially.
Given that Python 2.x’s raw unicode literals behave differently than
Python 3.x’s the "'ur'" syntax is not supported.
New in version 3.3: The "'rb'" prefix of raw bytes literals has been
added as a synonym of "'br'".
New in version 3.3: Support for the unicode legacy literal
("u'value'") was reintroduced to simplify the maintenance of dual
Python 2.x and 3.x codebases. See **PEP 414** for more information.
A string literal with "'f'" or "'F'" in its prefix is a *formatted
string literal*; see Formatted string literals. The "'f'" may be
combined with "'r'", but not with "'b'" or "'u'", therefore raw
formatted strings are possible, but formatted bytes literals are not.
In triple-quoted literals, unescaped newlines and quotes are allowed
(and are retained), except that three unescaped quotes in a row
terminate the literal. (A “quote” is the character used to open the
literal, i.e. either "'" or """.)
Unless an "'r'" or "'R'" prefix is present, escape sequences in string
and bytes literals are interpreted according to rules similar to those
used by Standard C. The recognized escape sequences are:
+-------------------+-----------------------------------+---------+
| Escape Sequence | Meaning | Notes |
|===================|===================================|=========|
| "\newline" | Backslash and newline ignored | |
+-------------------+-----------------------------------+---------+
| "\\" | Backslash ("\") | |
+-------------------+-----------------------------------+---------+
| "\'" | Single quote ("'") | |
+-------------------+-----------------------------------+---------+
| "\"" | Double quote (""") | |
+-------------------+-----------------------------------+---------+
| "\a" | ASCII Bell (BEL) | |
+-------------------+-----------------------------------+---------+
| "\b" | ASCII Backspace (BS) | |
+-------------------+-----------------------------------+---------+
| "\f" | ASCII Formfeed (FF) | |
+-------------------+-----------------------------------+---------+
| "\n" | ASCII Linefeed (LF) | |
+-------------------+-----------------------------------+---------+
| "\r" | ASCII Carriage Return (CR) | |
+-------------------+-----------------------------------+---------+
| "\t" | ASCII Horizontal Tab (TAB) | |
+-------------------+-----------------------------------+---------+
| "\v" | ASCII Vertical Tab (VT) | |
+-------------------+-----------------------------------+---------+
| "\ooo" | Character with octal value *ooo* | (1,3) |
+-------------------+-----------------------------------+---------+
| "\xhh" | Character with hex value *hh* | (2,3) |
+-------------------+-----------------------------------+---------+
Escape sequences only recognized in string literals are:
+-------------------+-----------------------------------+---------+
| Escape Sequence | Meaning | Notes |
|===================|===================================|=========|
| "\N{name}" | Character named *name* in the | (4) |
| | Unicode database | |
+-------------------+-----------------------------------+---------+
| "\uxxxx" | Character with 16-bit hex value | (5) |
| | *xxxx* | |
+-------------------+-----------------------------------+---------+
| "\Uxxxxxxxx" | Character with 32-bit hex value | (6) |
| | *xxxxxxxx* | |
+-------------------+-----------------------------------+---------+
Notes:
1. As in Standard C, up to three octal digits are accepted.
2. Unlike in Standard C, exactly two hex digits are required.
3. In a bytes literal, hexadecimal and octal escapes denote the byte
with the given value. In a string literal, these escapes denote a
Unicode character with the given value.
4. Changed in version 3.3: Support for name aliases [1] has been
added.
5. Exactly four hex digits are required.
6. Any Unicode character can be encoded this way. Exactly eight hex
digits are required.
Unlike Standard C, all unrecognized escape sequences are left in the
string unchanged, i.e., *the backslash is left in the result*. (This
behavior is useful when debugging: if an escape sequence is mistyped,
the resulting output is more easily recognized as broken.) It is also
important to note that the escape sequences only recognized in string
literals fall into the category of unrecognized escapes for bytes
literals.
Changed in version 3.6: Unrecognized escape sequences produce a
"DeprecationWarning". In a future Python version they will be a
"SyntaxWarning" and eventually a "SyntaxError".
Even in a raw literal, quotes can be escaped with a backslash, but the
backslash remains in the result; for example, "r"\""" is a valid
string literal consisting of two characters: a backslash and a double
quote; "r"\"" is not a valid string literal (even a raw string cannot
end in an odd number of backslashes). Specifically, *a raw literal
cannot end in a single backslash* (since the backslash would escape
the following quote character). Note also that a single backslash
followed by a newline is interpreted as those two characters as part
of the literal, *not* as a line continuation.
uM Subscriptions
*************
A subscription selects an item of a sequence (string, tuple or list)
or mapping (dictionary) object:
subscription ::= primary "[" expression_list "]"
The primary must evaluate to an object that supports subscription
(lists or dictionaries for example). User-defined objects can support
subscription by defining a "__getitem__()" method.
For built-in objects, there are two types of objects that support
subscription:
If the primary is a mapping, the expression list must evaluate to an
object whose value is one of the keys of the mapping, and the
subscription selects the value in the mapping that corresponds to that
key. (The expression list is a tuple except if it has exactly one
item.)
If the primary is a sequence, the expression list must evaluate to an
integer or a slice (as discussed in the following section).
The formal syntax makes no special provision for negative indices in
sequences; however, built-in sequences all provide a "__getitem__()"
method that interprets negative indices by adding the length of the
sequence to the index (so that "x[-1]" selects the last item of "x").
The resulting value must be a nonnegative integer less than the number
of items in the sequence, and the subscription selects the item whose
index is that value (counting from zero). Since the support for
negative indices and slicing occurs in the object’s "__getitem__()"
method, subclasses overriding this method will need to explicitly add
that support.
A string’s items are characters. A character is not a separate data
type but a string of exactly one character.
ax Truth Value Testing
*******************
Any object can be tested for truth value, for use in an "if" or
"while" condition or as operand of the Boolean operations below.
By default, an object is considered true unless its class defines
either a "__bool__()" method that returns "False" or a "__len__()"
method that returns zero, when called with the object. [1] Here are
most of the built-in objects considered false:
* constants defined to be false: "None" and "False".
* zero of any numeric type: "0", "0.0", "0j", "Decimal(0)",
"Fraction(0, 1)"
* empty sequences and collections: "''", "()", "[]", "{}", "set()",
"range(0)"
Operations and built-in functions that have a Boolean result always
return "0" or "False" for false and "1" or "True" for true, unless
otherwise stated. (Important exception: the Boolean operations "or"
and "and" always return one of their operands.)
uR The "try" statement
*******************
The "try" statement specifies exception handlers and/or cleanup code
for a group of statements:
try_stmt ::= try1_stmt | try2_stmt
try1_stmt ::= "try" ":" suite
("except" [expression ["as" identifier]] ":" suite)+
["else" ":" suite]
["finally" ":" suite]
try2_stmt ::= "try" ":" suite
"finally" ":" suite
The "except" clause(s) specify one or more exception handlers. When no
exception occurs in the "try" clause, no exception handler is
executed. When an exception occurs in the "try" suite, a search for an
exception handler is started. This search inspects the except clauses
in turn until one is found that matches the exception. An expression-
less except clause, if present, must be last; it matches any
exception. For an except clause with an expression, that expression
is evaluated, and the clause matches the exception if the resulting
object is “compatible” with the exception. An object is compatible
with an exception if it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base
class of the exception object.
If no except clause matches the exception, the search for an exception
handler continues in the surrounding code and on the invocation stack.
[1]
If the evaluation of an expression in the header of an except clause
raises an exception, the original search for a handler is canceled and
a search starts for the new exception in the surrounding code and on
the call stack (it is treated as if the entire "try" statement raised
the exception).
When a matching except clause is found, the exception is assigned to
the target specified after the "as" keyword in that except clause, if
present, and the except clause’s suite is executed. All except
clauses must have an executable block. When the end of this block is
reached, execution continues normally after the entire try statement.
(This means that if two nested handlers exist for the same exception,
and the exception occurs in the try clause of the inner handler, the
outer handler will not handle the exception.)
When an exception has been assigned using "as target", it is cleared
at the end of the except clause. This is as if
except E as N:
foo
was translated to
except E as N:
try:
foo
finally:
del N
This means the exception must be assigned to a different name to be
able to refer to it after the except clause. Exceptions are cleared
because with the traceback attached to them, they form a reference
cycle with the stack frame, keeping all locals in that frame alive
until the next garbage collection occurs.
Before an except clause’s suite is executed, details about the
exception are stored in the "sys" module and can be accessed via
"sys.exc_info()". "sys.exc_info()" returns a 3-tuple consisting of the
exception class, the exception instance and a traceback object (see
section The standard type hierarchy) identifying the point in the
program where the exception occurred. "sys.exc_info()" values are
restored to their previous values (before the call) when returning
from a function that handled an exception.
The optional "else" clause is executed if the control flow leaves the
"try" suite, no exception was raised, and no "return", "continue", or
"break" statement was executed. Exceptions in the "else" clause are
not handled by the preceding "except" clauses.
If "finally" is present, it specifies a ‘cleanup’ handler. The "try"
clause is executed, including any "except" and "else" clauses. If an
exception occurs in any of the clauses and is not handled, the
exception is temporarily saved. The "finally" clause is executed. If
there is a saved exception it is re-raised at the end of the "finally"
clause. If the "finally" clause raises another exception, the saved
exception is set as the context of the new exception. If the "finally"
clause executes a "return", "break" or "continue" statement, the saved
exception is discarded:
>>> def f():
... try:
... 1/0
... finally:
... return 42
...
>>> f()
42
The exception information is not available to the program during
execution of the "finally" clause.
When a "return", "break" or "continue" statement is executed in the
"try" suite of a "try"…"finally" statement, the "finally" clause is
also executed ‘on the way out.’
The return value of a function is determined by the last "return"
statement executed. Since the "finally" clause always executes, a
"return" statement executed in the "finally" clause will always be the
last one executed:
>>> def foo():
... try:
... return 'try'
... finally:
... return 'finally'
...
>>> foo()
'finally'
Additional information on exceptions can be found in section
Exceptions, and information on using the "raise" statement to generate
exceptions may be found in section The raise statement.
Changed in version 3.8: Prior to Python 3.8, a "continue" statement
was illegal in the "finally" clause due to a problem with the
implementation.
ux� The standard type hierarchy
***************************
Below is a list of the types that are built into Python. Extension
modules (written in C, Java, or other languages, depending on the
implementation) can define additional types. Future versions of
Python may add types to the type hierarchy (e.g., rational numbers,
efficiently stored arrays of integers, etc.), although such additions
will often be provided via the standard library instead.
Some of the type descriptions below contain a paragraph listing
‘special attributes.’ These are attributes that provide access to the
implementation and are not intended for general use. Their definition
may change in the future.
None
This type has a single value. There is a single object with this
value. This object is accessed through the built-in name "None". It
is used to signify the absence of a value in many situations, e.g.,
it is returned from functions that don’t explicitly return
anything. Its truth value is false.
NotImplemented
This type has a single value. There is a single object with this
value. This object is accessed through the built-in name
"NotImplemented". Numeric methods and rich comparison methods
should return this value if they do not implement the operation for
the operands provided. (The interpreter will then try the
reflected operation, or some other fallback, depending on the
operator.) Its truth value is true.
See Implementing the arithmetic operations for more details.
Ellipsis
This type has a single value. There is a single object with this
value. This object is accessed through the literal "..." or the
built-in name "Ellipsis". Its truth value is true.
"numbers.Number"
These are created by numeric literals and returned as results by
arithmetic operators and arithmetic built-in functions. Numeric
objects are immutable; once created their value never changes.
Python numbers are of course strongly related to mathematical
numbers, but subject to the limitations of numerical representation
in computers.
The string representations of the numeric classes, computed by
"__repr__()" and "__str__()", have the following properties:
* They are valid numeric literals which, when passed to their class
constructor, produce an object having the value of the original
numeric.
* The representation is in base 10, when possible.
* Leading zeros, possibly excepting a single zero before a decimal
point, are not shown.
* Trailing zeros, possibly excepting a single zero after a decimal
point, are not shown.
* A sign is shown only when the number is negative.
Python distinguishes between integers, floating point numbers, and
complex numbers:
"numbers.Integral"
These represent elements from the mathematical set of integers
(positive and negative).
There are two types of integers:
Integers ("int")
These represent numbers in an unlimited range, subject to
available (virtual) memory only. For the purpose of shift
and mask operations, a binary representation is assumed, and
negative numbers are represented in a variant of 2’s
complement which gives the illusion of an infinite string of
sign bits extending to the left.
Booleans ("bool")
These represent the truth values False and True. The two
objects representing the values "False" and "True" are the
only Boolean objects. The Boolean type is a subtype of the
integer type, and Boolean values behave like the values 0 and
1, respectively, in almost all contexts, the exception being
that when converted to a string, the strings ""False"" or
""True"" are returned, respectively.
The rules for integer representation are intended to give the
most meaningful interpretation of shift and mask operations
involving negative integers.
"numbers.Real" ("float")
These represent machine-level double precision floating point
numbers. You are at the mercy of the underlying machine
architecture (and C or Java implementation) for the accepted
range and handling of overflow. Python does not support single-
precision floating point numbers; the savings in processor and
memory usage that are usually the reason for using these are
dwarfed by the overhead of using objects in Python, so there is
no reason to complicate the language with two kinds of floating
point numbers.
"numbers.Complex" ("complex")
These represent complex numbers as a pair of machine-level
double precision floating point numbers. The same caveats apply
as for floating point numbers. The real and imaginary parts of a
complex number "z" can be retrieved through the read-only
attributes "z.real" and "z.imag".
Sequences
These represent finite ordered sets indexed by non-negative
numbers. The built-in function "len()" returns the number of items
of a sequence. When the length of a sequence is *n*, the index set
contains the numbers 0, 1, …, *n*-1. Item *i* of sequence *a* is
selected by "a[i]".
Sequences also support slicing: "a[i:j]" selects all items with
index *k* such that *i* "<=" *k* "<" *j*. When used as an
expression, a slice is a sequence of the same type. This implies
that the index set is renumbered so that it starts at 0.
Some sequences also support “extended slicing” with a third “step”
parameter: "a[i:j:k]" selects all items of *a* with index *x* where
"x = i + n*k", *n* ">=" "0" and *i* "<=" *x* "<" *j*.
Sequences are distinguished according to their mutability:
Immutable sequences
An object of an immutable sequence type cannot change once it is
created. (If the object contains references to other objects,
these other objects may be mutable and may be changed; however,
the collection of objects directly referenced by an immutable
object cannot change.)
The following types are immutable sequences:
Strings
A string is a sequence of values that represent Unicode code
points. All the code points in the range "U+0000 - U+10FFFF"
can be represented in a string. Python doesn’t have a "char"
type; instead, every code point in the string is represented
as a string object with length "1". The built-in function
"ord()" converts a code point from its string form to an
integer in the range "0 - 10FFFF"; "chr()" converts an
integer in the range "0 - 10FFFF" to the corresponding length
"1" string object. "str.encode()" can be used to convert a
"str" to "bytes" using the given text encoding, and
"bytes.decode()" can be used to achieve the opposite.
Tuples
The items of a tuple are arbitrary Python objects. Tuples of
two or more items are formed by comma-separated lists of
expressions. A tuple of one item (a ‘singleton’) can be
formed by affixing a comma to an expression (an expression by
itself does not create a tuple, since parentheses must be
usable for grouping of expressions). An empty tuple can be
formed by an empty pair of parentheses.
Bytes
A bytes object is an immutable array. The items are 8-bit
bytes, represented by integers in the range 0 <= x < 256.
Bytes literals (like "b'abc'") and the built-in "bytes()"
constructor can be used to create bytes objects. Also, bytes
objects can be decoded to strings via the "decode()" method.
Mutable sequences
Mutable sequences can be changed after they are created. The
subscription and slicing notations can be used as the target of
assignment and "del" (delete) statements.
There are currently two intrinsic mutable sequence types:
Lists
The items of a list are arbitrary Python objects. Lists are
formed by placing a comma-separated list of expressions in
square brackets. (Note that there are no special cases needed
to form lists of length 0 or 1.)
Byte Arrays
A bytearray object is a mutable array. They are created by
the built-in "bytearray()" constructor. Aside from being
mutable (and hence unhashable), byte arrays otherwise provide
the same interface and functionality as immutable "bytes"
objects.
The extension module "array" provides an additional example of a
mutable sequence type, as does the "collections" module.
Set types
These represent unordered, finite sets of unique, immutable
objects. As such, they cannot be indexed by any subscript. However,
they can be iterated over, and the built-in function "len()"
returns the number of items in a set. Common uses for sets are fast
membership testing, removing duplicates from a sequence, and
computing mathematical operations such as intersection, union,
difference, and symmetric difference.
For set elements, the same immutability rules apply as for
dictionary keys. Note that numeric types obey the normal rules for
numeric comparison: if two numbers compare equal (e.g., "1" and
"1.0"), only one of them can be contained in a set.
There are currently two intrinsic set types:
Sets
These represent a mutable set. They are created by the built-in
"set()" constructor and can be modified afterwards by several
methods, such as "add()".
Frozen sets
These represent an immutable set. They are created by the
built-in "frozenset()" constructor. As a frozenset is immutable
and *hashable*, it can be used again as an element of another
set, or as a dictionary key.
Mappings
These represent finite sets of objects indexed by arbitrary index
sets. The subscript notation "a[k]" selects the item indexed by "k"
from the mapping "a"; this can be used in expressions and as the
target of assignments or "del" statements. The built-in function
"len()" returns the number of items in a mapping.
There is currently a single intrinsic mapping type:
Dictionaries
These represent finite sets of objects indexed by nearly
arbitrary values. The only types of values not acceptable as
keys are values containing lists or dictionaries or other
mutable types that are compared by value rather than by object
identity, the reason being that the efficient implementation of
dictionaries requires a key’s hash value to remain constant.
Numeric types used for keys obey the normal rules for numeric
comparison: if two numbers compare equal (e.g., "1" and "1.0")
then they can be used interchangeably to index the same
dictionary entry.
Dictionaries preserve insertion order, meaning that keys will be
produced in the same order they were added sequentially over the
dictionary. Replacing an existing key does not change the order,
however removing a key and re-inserting it will add it to the
end instead of keeping its old place.
Dictionaries are mutable; they can be created by the "{...}"
notation (see section Dictionary displays).
The extension modules "dbm.ndbm" and "dbm.gnu" provide
additional examples of mapping types, as does the "collections"
module.
Changed in version 3.7: Dictionaries did not preserve insertion
order in versions of Python before 3.6. In CPython 3.6,
insertion order was preserved, but it was considered an
implementation detail at that time rather than a language
guarantee.
Callable types
These are the types to which the function call operation (see
section Calls) can be applied:
User-defined functions
A user-defined function object is created by a function
definition (see section Function definitions). It should be
called with an argument list containing the same number of items
as the function’s formal parameter list.
Special attributes:
+---------------------------+---------------------------------+-------------+
| Attribute | Meaning | |
|===========================|=================================|=============|
| "__doc__" | The function’s documentation | Writable |
| | string, or "None" if | |
| | unavailable; not inherited by | |
| | subclasses. | |
+---------------------------+---------------------------------+-------------+
| "__name__" | The function’s name. | Writable |
+---------------------------+---------------------------------+-------------+
| "__qualname__" | The function’s *qualified | Writable |
| | name*. New in version 3.3. | |
+---------------------------+---------------------------------+-------------+
| "__module__" | The name of the module the | Writable |
| | function was defined in, or | |
| | "None" if unavailable. | |
+---------------------------+---------------------------------+-------------+
| "__defaults__" | A tuple containing default | Writable |
| | argument values for those | |
| | arguments that have defaults, | |
| | or "None" if no arguments have | |
| | a default value. | |
+---------------------------+---------------------------------+-------------+
| "__code__" | The code object representing | Writable |
| | the compiled function body. | |
+---------------------------+---------------------------------+-------------+
| "__globals__" | A reference to the dictionary | Read-only |
| | that holds the function’s | |
| | global variables — the global | |
| | namespace of the module in | |
| | which the function was defined. | |
+---------------------------+---------------------------------+-------------+
| "__dict__" | The namespace supporting | Writable |
| | arbitrary function attributes. | |
+---------------------------+---------------------------------+-------------+
| "__closure__" | "None" or a tuple of cells that | Read-only |
| | contain bindings for the | |
| | function’s free variables. See | |
| | below for information on the | |
| | "cell_contents" attribute. | |
+---------------------------+---------------------------------+-------------+
| "__annotations__" | A dict containing annotations | Writable |
| | of parameters. The keys of the | |
| | dict are the parameter names, | |
| | and "'return'" for the return | |
| | annotation, if provided. | |
+---------------------------+---------------------------------+-------------+
| "__kwdefaults__" | A dict containing defaults for | Writable |
| | keyword-only parameters. | |
+---------------------------+---------------------------------+-------------+
Most of the attributes labelled “Writable” check the type of the
assigned value.
Function objects also support getting and setting arbitrary
attributes, which can be used, for example, to attach metadata
to functions. Regular attribute dot-notation is used to get and
set such attributes. *Note that the current implementation only
supports function attributes on user-defined functions. Function
attributes on built-in functions may be supported in the
future.*
A cell object has the attribute "cell_contents". This can be
used to get the value of the cell, as well as set the value.
Additional information about a function’s definition can be
retrieved from its code object; see the description of internal
types below. The "cell" type can be accessed in the "types"
module.
Instance methods
An instance method object combines a class, a class instance and
any callable object (normally a user-defined function).
Special read-only attributes: "__self__" is the class instance
object, "__func__" is the function object; "__doc__" is the
method’s documentation (same as "__func__.__doc__"); "__name__"
is the method name (same as "__func__.__name__"); "__module__"
is the name of the module the method was defined in, or "None"
if unavailable.
Methods also support accessing (but not setting) the arbitrary
function attributes on the underlying function object.
User-defined method objects may be created when getting an
attribute of a class (perhaps via an instance of that class), if
that attribute is a user-defined function object or a class
method object.
When an instance method object is created by retrieving a user-
defined function object from a class via one of its instances,
its "__self__" attribute is the instance, and the method object
is said to be bound. The new method’s "__func__" attribute is
the original function object.
When an instance method object is created by retrieving a class
method object from a class or instance, its "__self__" attribute
is the class itself, and its "__func__" attribute is the
function object underlying the class method.
When an instance method object is called, the underlying
function ("__func__") is called, inserting the class instance
("__self__") in front of the argument list. For instance, when
"C" is a class which contains a definition for a function "f()",
and "x" is an instance of "C", calling "x.f(1)" is equivalent to
calling "C.f(x, 1)".
When an instance method object is derived from a class method
object, the “class instance” stored in "__self__" will actually
be the class itself, so that calling either "x.f(1)" or "C.f(1)"
is equivalent to calling "f(C,1)" where "f" is the underlying
function.
Note that the transformation from function object to instance
method object happens each time the attribute is retrieved from
the instance. In some cases, a fruitful optimization is to
assign the attribute to a local variable and call that local
variable. Also notice that this transformation only happens for
user-defined functions; other callable objects (and all non-
callable objects) are retrieved without transformation. It is
also important to note that user-defined functions which are
attributes of a class instance are not converted to bound
methods; this *only* happens when the function is an attribute
of the class.
Generator functions
A function or method which uses the "yield" statement (see
section The yield statement) is called a *generator function*.
Such a function, when called, always returns an iterator object
which can be used to execute the body of the function: calling
the iterator’s "iterator.__next__()" method will cause the
function to execute until it provides a value using the "yield"
statement. When the function executes a "return" statement or
falls off the end, a "StopIteration" exception is raised and the
iterator will have reached the end of the set of values to be
returned.
Coroutine functions
A function or method which is defined using "async def" is
called a *coroutine function*. Such a function, when called,
returns a *coroutine* object. It may contain "await"
expressions, as well as "async with" and "async for" statements.
See also the Coroutine Objects section.
Asynchronous generator functions
A function or method which is defined using "async def" and
which uses the "yield" statement is called a *asynchronous
generator function*. Such a function, when called, returns an
asynchronous iterator object which can be used in an "async for"
statement to execute the body of the function.
Calling the asynchronous iterator’s "aiterator.__anext__()"
method will return an *awaitable* which when awaited will
execute until it provides a value using the "yield" expression.
When the function executes an empty "return" statement or falls
off the end, a "StopAsyncIteration" exception is raised and the
asynchronous iterator will have reached the end of the set of
values to be yielded.
Built-in functions
A built-in function object is a wrapper around a C function.
Examples of built-in functions are "len()" and "math.sin()"
("math" is a standard built-in module). The number and type of
the arguments are determined by the C function. Special read-
only attributes: "__doc__" is the function’s documentation
string, or "None" if unavailable; "__name__" is the function’s
name; "__self__" is set to "None" (but see the next item);
"__module__" is the name of the module the function was defined
in or "None" if unavailable.
Built-in methods
This is really a different disguise of a built-in function, this
time containing an object passed to the C function as an
implicit extra argument. An example of a built-in method is
"alist.append()", assuming *alist* is a list object. In this
case, the special read-only attribute "__self__" is set to the
object denoted by *alist*.
Classes
Classes are callable. These objects normally act as factories
for new instances of themselves, but variations are possible for
class types that override "__new__()". The arguments of the
call are passed to "__new__()" and, in the typical case, to
"__init__()" to initialize the new instance.
Class Instances
Instances of arbitrary classes can be made callable by defining
a "__call__()" method in their class.
Modules
Modules are a basic organizational unit of Python code, and are
created by the import system as invoked either by the "import"
statement, or by calling functions such as
"importlib.import_module()" and built-in "__import__()". A module
object has a namespace implemented by a dictionary object (this is
the dictionary referenced by the "__globals__" attribute of
functions defined in the module). Attribute references are
translated to lookups in this dictionary, e.g., "m.x" is equivalent
to "m.__dict__["x"]". A module object does not contain the code
object used to initialize the module (since it isn’t needed once
the initialization is done).
Attribute assignment updates the module’s namespace dictionary,
e.g., "m.x = 1" is equivalent to "m.__dict__["x"] = 1".
Predefined (writable) attributes: "__name__" is the module’s name;
"__doc__" is the module’s documentation string, or "None" if
unavailable; "__annotations__" (optional) is a dictionary
containing *variable annotations* collected during module body
execution; "__file__" is the pathname of the file from which the
module was loaded, if it was loaded from a file. The "__file__"
attribute may be missing for certain types of modules, such as C
modules that are statically linked into the interpreter; for
extension modules loaded dynamically from a shared library, it is
the pathname of the shared library file.
Special read-only attribute: "__dict__" is the module’s namespace
as a dictionary object.
**CPython implementation detail:** Because of the way CPython
clears module dictionaries, the module dictionary will be cleared
when the module falls out of scope even if the dictionary still has
live references. To avoid this, copy the dictionary or keep the
module around while using its dictionary directly.
Custom classes
Custom class types are typically created by class definitions (see
section Class definitions). A class has a namespace implemented by
a dictionary object. Class attribute references are translated to
lookups in this dictionary, e.g., "C.x" is translated to
"C.__dict__["x"]" (although there are a number of hooks which allow
for other means of locating attributes). When the attribute name is
not found there, the attribute search continues in the base
classes. This search of the base classes uses the C3 method
resolution order which behaves correctly even in the presence of
‘diamond’ inheritance structures where there are multiple
inheritance paths leading back to a common ancestor. Additional
details on the C3 MRO used by Python can be found in the
documentation accompanying the 2.3 release at
https://www.python.org/download/releases/2.3/mro/.
When a class attribute reference (for class "C", say) would yield a
class method object, it is transformed into an instance method
object whose "__self__" attribute is "C". When it would yield a
static method object, it is transformed into the object wrapped by
the static method object. See section Implementing Descriptors for
another way in which attributes retrieved from a class may differ
from those actually contained in its "__dict__".
Class attribute assignments update the class’s dictionary, never
the dictionary of a base class.
A class object can be called (see above) to yield a class instance
(see below).
Special attributes: "__name__" is the class name; "__module__" is
the module name in which the class was defined; "__dict__" is the
dictionary containing the class’s namespace; "__bases__" is a tuple
containing the base classes, in the order of their occurrence in
the base class list; "__doc__" is the class’s documentation string,
or "None" if undefined; "__annotations__" (optional) is a
dictionary containing *variable annotations* collected during class
body execution.
Class instances
A class instance is created by calling a class object (see above).
A class instance has a namespace implemented as a dictionary which
is the first place in which attribute references are searched.
When an attribute is not found there, and the instance’s class has
an attribute by that name, the search continues with the class
attributes. If a class attribute is found that is a user-defined
function object, it is transformed into an instance method object
whose "__self__" attribute is the instance. Static method and
class method objects are also transformed; see above under
“Classes”. See section Implementing Descriptors for another way in
which attributes of a class retrieved via its instances may differ
from the objects actually stored in the class’s "__dict__". If no
class attribute is found, and the object’s class has a
"__getattr__()" method, that is called to satisfy the lookup.
Attribute assignments and deletions update the instance’s
dictionary, never a class’s dictionary. If the class has a
"__setattr__()" or "__delattr__()" method, this is called instead
of updating the instance dictionary directly.
Class instances can pretend to be numbers, sequences, or mappings
if they have methods with certain special names. See section
Special method names.
Special attributes: "__dict__" is the attribute dictionary;
"__class__" is the instance’s class.
I/O objects (also known as file objects)
A *file object* represents an open file. Various shortcuts are
available to create file objects: the "open()" built-in function,
and also "os.popen()", "os.fdopen()", and the "makefile()" method
of socket objects (and perhaps by other functions or methods
provided by extension modules).
The objects "sys.stdin", "sys.stdout" and "sys.stderr" are
initialized to file objects corresponding to the interpreter’s
standard input, output and error streams; they are all open in text
mode and therefore follow the interface defined by the
"io.TextIOBase" abstract class.
Internal types
A few types used internally by the interpreter are exposed to the
user. Their definitions may change with future versions of the
interpreter, but they are mentioned here for completeness.
Code objects
Code objects represent *byte-compiled* executable Python code,
or *bytecode*. The difference between a code object and a
function object is that the function object contains an explicit
reference to the function’s globals (the module in which it was
defined), while a code object contains no context; also the
default argument values are stored in the function object, not
in the code object (because they represent values calculated at
run-time). Unlike function objects, code objects are immutable
and contain no references (directly or indirectly) to mutable
objects.
Special read-only attributes: "co_name" gives the function name;
"co_argcount" is the total number of positional arguments
(including positional-only arguments and arguments with default
values); "co_posonlyargcount" is the number of positional-only
arguments (including arguments with default values);
"co_kwonlyargcount" is the number of keyword-only arguments
(including arguments with default values); "co_nlocals" is the
number of local variables used by the function (including
arguments); "co_varnames" is a tuple containing the names of the
local variables (starting with the argument names);
"co_cellvars" is a tuple containing the names of local variables
that are referenced by nested functions; "co_freevars" is a
tuple containing the names of free variables; "co_code" is a
string representing the sequence of bytecode instructions;
"co_consts" is a tuple containing the literals used by the
bytecode; "co_names" is a tuple containing the names used by the
bytecode; "co_filename" is the filename from which the code was
compiled; "co_firstlineno" is the first line number of the
function; "co_lnotab" is a string encoding the mapping from
bytecode offsets to line numbers (for details see the source
code of the interpreter); "co_stacksize" is the required stack
size; "co_flags" is an integer encoding a number of flags for
the interpreter.
The following flag bits are defined for "co_flags": bit "0x04"
is set if the function uses the "*arguments" syntax to accept an
arbitrary number of positional arguments; bit "0x08" is set if
the function uses the "**keywords" syntax to accept arbitrary
keyword arguments; bit "0x20" is set if the function is a
generator.
Future feature declarations ("from __future__ import division")
also use bits in "co_flags" to indicate whether a code object
was compiled with a particular feature enabled: bit "0x2000" is
set if the function was compiled with future division enabled;
bits "0x10" and "0x1000" were used in earlier versions of
Python.
Other bits in "co_flags" are reserved for internal use.
If a code object represents a function, the first item in
"co_consts" is the documentation string of the function, or
"None" if undefined.
Frame objects
Frame objects represent execution frames. They may occur in
traceback objects (see below), and are also passed to registered
trace functions.
Special read-only attributes: "f_back" is to the previous stack
frame (towards the caller), or "None" if this is the bottom
stack frame; "f_code" is the code object being executed in this
frame; "f_locals" is the dictionary used to look up local
variables; "f_globals" is used for global variables;
"f_builtins" is used for built-in (intrinsic) names; "f_lasti"
gives the precise instruction (this is an index into the
bytecode string of the code object).
Accessing "f_code" raises an auditing event "object.__getattr__"
with arguments "obj" and ""f_code"".
Special writable attributes: "f_trace", if not "None", is a
function called for various events during code execution (this
is used by the debugger). Normally an event is triggered for
each new source line - this can be disabled by setting
"f_trace_lines" to "False".
Implementations *may* allow per-opcode events to be requested by
setting "f_trace_opcodes" to "True". Note that this may lead to
undefined interpreter behaviour if exceptions raised by the
trace function escape to the function being traced.
"f_lineno" is the current line number of the frame — writing to
this from within a trace function jumps to the given line (only
for the bottom-most frame). A debugger can implement a Jump
command (aka Set Next Statement) by writing to f_lineno.
Frame objects support one method:
frame.clear()
This method clears all references to local variables held by
the frame. Also, if the frame belonged to a generator, the
generator is finalized. This helps break reference cycles
involving frame objects (for example when catching an
exception and storing its traceback for later use).
"RuntimeError" is raised if the frame is currently executing.
New in version 3.4.
Traceback objects
Traceback objects represent a stack trace of an exception. A
traceback object is implicitly created when an exception occurs,
and may also be explicitly created by calling
"types.TracebackType".
For implicitly created tracebacks, when the search for an
exception handler unwinds the execution stack, at each unwound
level a traceback object is inserted in front of the current
traceback. When an exception handler is entered, the stack
trace is made available to the program. (See section The try
statement.) It is accessible as the third item of the tuple
returned by "sys.exc_info()", and as the "__traceback__"
attribute of the caught exception.
When the program contains no suitable handler, the stack trace
is written (nicely formatted) to the standard error stream; if
the interpreter is interactive, it is also made available to the
user as "sys.last_traceback".
For explicitly created tracebacks, it is up to the creator of
the traceback to determine how the "tb_next" attributes should
be linked to form a full stack trace.
Special read-only attributes: "tb_frame" points to the execution
frame of the current level; "tb_lineno" gives the line number
where the exception occurred; "tb_lasti" indicates the precise
instruction. The line number and last instruction in the
traceback may differ from the line number of its frame object if
the exception occurred in a "try" statement with no matching
except clause or with a finally clause.
Accessing "tb_frame" raises an auditing event
"object.__getattr__" with arguments "obj" and ""tb_frame"".
Special writable attribute: "tb_next" is the next level in the
stack trace (towards the frame where the exception occurred), or
"None" if there is no next level.
Changed in version 3.7: Traceback objects can now be explicitly
instantiated from Python code, and the "tb_next" attribute of
existing instances can be updated.
Slice objects
Slice objects are used to represent slices for "__getitem__()"
methods. They are also created by the built-in "slice()"
function.
Special read-only attributes: "start" is the lower bound; "stop"
is the upper bound; "step" is the step value; each is "None" if
omitted. These attributes can have any type.
Slice objects support one method:
slice.indices(self, length)
This method takes a single integer argument *length* and
computes information about the slice that the slice object
would describe if applied to a sequence of *length* items.
It returns a tuple of three integers; respectively these are
the *start* and *stop* indices and the *step* or stride
length of the slice. Missing or out-of-bounds indices are
handled in a manner consistent with regular slices.
Static method objects
Static method objects provide a way of defeating the
transformation of function objects to method objects described
above. A static method object is a wrapper around any other
object, usually a user-defined method object. When a static
method object is retrieved from a class or a class instance, the
object actually returned is the wrapped object, which is not
subject to any further transformation. Static method objects are
not themselves callable, although the objects they wrap usually
are. Static method objects are created by the built-in
"staticmethod()" constructor.
Class method objects
A class method object, like a static method object, is a wrapper
around another object that alters the way in which that object
is retrieved from classes and class instances. The behaviour of
class method objects upon such retrieval is described above,
under “User-defined methods”. Class method objects are created
by the built-in "classmethod()" constructor.
a� Functions
*********
Function objects are created by function definitions. The only
operation on a function object is to call it: "func(argument-list)".
There are really two flavors of function objects: built-in functions
and user-defined functions. Both support the same operation (to call
the function), but the implementation is different, hence the
different object types.
See Function definitions for more information.
u(. Mapping Types — "dict"
**********************
A *mapping* object maps *hashable* values to arbitrary objects.
Mappings are mutable objects. There is currently only one standard
mapping type, the *dictionary*. (For other containers see the built-
in "list", "set", and "tuple" classes, and the "collections" module.)
A dictionary’s keys are *almost* arbitrary values. Values that are
not *hashable*, that is, values containing lists, dictionaries or
other mutable types (that are compared by value rather than by object
identity) may not be used as keys. Numeric types used for keys obey
the normal rules for numeric comparison: if two numbers compare equal
(such as "1" and "1.0") then they can be used interchangeably to index
the same dictionary entry. (Note however, that since computers store
floating-point numbers as approximations it is usually unwise to use
them as dictionary keys.)
Dictionaries can be created by placing a comma-separated list of "key:
value" pairs within braces, for example: "{'jack': 4098, 'sjoerd':
4127}" or "{4098: 'jack', 4127: 'sjoerd'}", or by the "dict"
constructor.
class dict(**kwarg)
class dict(mapping, **kwarg)
class dict(iterable, **kwarg)
Return a new dictionary initialized from an optional positional
argument and a possibly empty set of keyword arguments.
Dictionaries can be created by several means:
* Use a comma-separated list of "key: value" pairs within braces:
"{'jack': 4098, 'sjoerd': 4127}" or "{4098: 'jack', 4127:
'sjoerd'}"
* Use a dict comprehension: "{}", "{x: x ** 2 for x in range(10)}"
* Use the type constructor: "dict()", "dict([('foo', 100), ('bar',
200)])", "dict(foo=100, bar=200)"
If no positional argument is given, an empty dictionary is created.
If a positional argument is given and it is a mapping object, a
dictionary is created with the same key-value pairs as the mapping
object. Otherwise, the positional argument must be an *iterable*
object. Each item in the iterable must itself be an iterable with
exactly two objects. The first object of each item becomes a key
in the new dictionary, and the second object the corresponding
value. If a key occurs more than once, the last value for that key
becomes the corresponding value in the new dictionary.
If keyword arguments are given, the keyword arguments and their
values are added to the dictionary created from the positional
argument. If a key being added is already present, the value from
the keyword argument replaces the value from the positional
argument.
To illustrate, the following examples all return a dictionary equal
to "{"one": 1, "two": 2, "three": 3}":
>>> a = dict(one=1, two=2, three=3)
>>> b = {'one': 1, 'two': 2, 'three': 3}
>>> c = dict(zip(['one', 'two', 'three'], [1, 2, 3]))
>>> d = dict([('two', 2), ('one', 1), ('three', 3)])
>>> e = dict({'three': 3, 'one': 1, 'two': 2})
>>> a == b == c == d == e
True
Providing keyword arguments as in the first example only works for
keys that are valid Python identifiers. Otherwise, any valid keys
can be used.
These are the operations that dictionaries support (and therefore,
custom mapping types should support too):
list(d)
Return a list of all the keys used in the dictionary *d*.
len(d)
Return the number of items in the dictionary *d*.
d[key]
Return the item of *d* with key *key*. Raises a "KeyError" if
*key* is not in the map.
If a subclass of dict defines a method "__missing__()" and *key*
is not present, the "d[key]" operation calls that method with
the key *key* as argument. The "d[key]" operation then returns
or raises whatever is returned or raised by the
"__missing__(key)" call. No other operations or methods invoke
"__missing__()". If "__missing__()" is not defined, "KeyError"
is raised. "__missing__()" must be a method; it cannot be an
instance variable:
>>> class Counter(dict):
... def __missing__(self, key):
... return 0
>>> c = Counter()
>>> c['red']
0
>>> c['red'] += 1
>>> c['red']
1
The example above shows part of the implementation of
"collections.Counter". A different "__missing__" method is used
by "collections.defaultdict".
d[key] = value
Set "d[key]" to *value*.
del d[key]
Remove "d[key]" from *d*. Raises a "KeyError" if *key* is not
in the map.
key in d
Return "True" if *d* has a key *key*, else "False".
key not in d
Equivalent to "not key in d".
iter(d)
Return an iterator over the keys of the dictionary. This is a
shortcut for "iter(d.keys())".
clear()
Remove all items from the dictionary.
copy()
Return a shallow copy of the dictionary.
classmethod fromkeys(iterable[, value])
Create a new dictionary with keys from *iterable* and values set
to *value*.
"fromkeys()" is a class method that returns a new dictionary.
*value* defaults to "None". All of the values refer to just a
single instance, so it generally doesn’t make sense for *value*
to be a mutable object such as an empty list. To get distinct
values, use a dict comprehension instead.
get(key[, default])
Return the value for *key* if *key* is in the dictionary, else
*default*. If *default* is not given, it defaults to "None", so
that this method never raises a "KeyError".
items()
Return a new view of the dictionary’s items ("(key, value)"
pairs). See the documentation of view objects.
keys()
Return a new view of the dictionary’s keys. See the
documentation of view objects.
pop(key[, default])
If *key* is in the dictionary, remove it and return its value,
else return *default*. If *default* is not given and *key* is
not in the dictionary, a "KeyError" is raised.
popitem()
Remove and return a "(key, value)" pair from the dictionary.
Pairs are returned in LIFO (last-in, first-out) order.
"popitem()" is useful to destructively iterate over a
dictionary, as often used in set algorithms. If the dictionary
is empty, calling "popitem()" raises a "KeyError".
Changed in version 3.7: LIFO order is now guaranteed. In prior
versions, "popitem()" would return an arbitrary key/value pair.
reversed(d)
Return a reverse iterator over the keys of the dictionary. This
is a shortcut for "reversed(d.keys())".
New in version 3.8.
setdefault(key[, default])
If *key* is in the dictionary, return its value. If not, insert
*key* with a value of *default* and return *default*. *default*
defaults to "None".
update([other])
Update the dictionary with the key/value pairs from *other*,
overwriting existing keys. Return "None".
"update()" accepts either another dictionary object or an
iterable of key/value pairs (as tuples or other iterables of
length two). If keyword arguments are specified, the dictionary
is then updated with those key/value pairs: "d.update(red=1,
blue=2)".
values()
Return a new view of the dictionary’s values. See the
documentation of view objects.
An equality comparison between one "dict.values()" view and
another will always return "False". This also applies when
comparing "dict.values()" to itself:
>>> d = {'a': 1}
>>> d.values() == d.values()
False
Dictionaries compare equal if and only if they have the same "(key,
value)" pairs (regardless of ordering). Order comparisons (‘<’,
‘<=’, ‘>=’, ‘>’) raise "TypeError".
Dictionaries preserve insertion order. Note that updating a key
does not affect the order. Keys added after deletion are inserted
at the end.
>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> d
{'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> list(d)
['one', 'two', 'three', 'four']
>>> list(d.values())
[1, 2, 3, 4]
>>> d["one"] = 42
>>> d
{'one': 42, 'two': 2, 'three': 3, 'four': 4}
>>> del d["two"]
>>> d["two"] = None
>>> d
{'one': 42, 'three': 3, 'four': 4, 'two': None}
Changed in version 3.7: Dictionary order is guaranteed to be
insertion order. This behavior was an implementation detail of
CPython from 3.6.
Dictionaries and dictionary views are reversible.
>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> d
{'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> list(reversed(d))
['four', 'three', 'two', 'one']
>>> list(reversed(d.values()))
[4, 3, 2, 1]
>>> list(reversed(d.items()))
[('four', 4), ('three', 3), ('two', 2), ('one', 1)]
Changed in version 3.8: Dictionaries are now reversible.
See also:
"types.MappingProxyType" can be used to create a read-only view of a
"dict".
Dictionary view objects
=======================
The objects returned by "dict.keys()", "dict.values()" and
"dict.items()" are *view objects*. They provide a dynamic view on the
dictionary’s entries, which means that when the dictionary changes,
the view reflects these changes.
Dictionary views can be iterated over to yield their respective data,
and support membership tests:
len(dictview)
Return the number of entries in the dictionary.
iter(dictview)
Return an iterator over the keys, values or items (represented as
tuples of "(key, value)") in the dictionary.
Keys and values are iterated over in insertion order. This allows
the creation of "(value, key)" pairs using "zip()": "pairs =
zip(d.values(), d.keys())". Another way to create the same list is
"pairs = [(v, k) for (k, v) in d.items()]".
Iterating views while adding or deleting entries in the dictionary
may raise a "RuntimeError" or fail to iterate over all entries.
Changed in version 3.7: Dictionary order is guaranteed to be
insertion order.
x in dictview
Return "True" if *x* is in the underlying dictionary’s keys, values
or items (in the latter case, *x* should be a "(key, value)"
tuple).
reversed(dictview)
Return a reverse iterator over the keys, values or items of the
dictionary. The view will be iterated in reverse order of the
insertion.
Changed in version 3.8: Dictionary views are now reversible.
Keys views are set-like since their entries are unique and hashable.
If all values are hashable, so that "(key, value)" pairs are unique
and hashable, then the items view is also set-like. (Values views are
not treated as set-like since the entries are generally not unique.)
For set-like views, all of the operations defined for the abstract
base class "collections.abc.Set" are available (for example, "==",
"<", or "^").
An example of dictionary view usage:
>>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500}
>>> keys = dishes.keys()
>>> values = dishes.values()
>>> # iteration
>>> n = 0
>>> for val in values:
... n += val
>>> print(n)
504
>>> # keys and values are iterated over in the same order (insertion order)
>>> list(keys)
['eggs', 'sausage', 'bacon', 'spam']
>>> list(values)
[2, 1, 1, 500]
>>> # view objects are dynamic and reflect dict changes
>>> del dishes['eggs']
>>> del dishes['sausage']
>>> list(keys)
['bacon', 'spam']
>>> # set operations
>>> keys & {'eggs', 'bacon', 'salad'}
{'bacon'}
>>> keys ^ {'sausage', 'juice'}
{'juice', 'sausage', 'bacon', 'spam'}
a� Methods
*******
Methods are functions that are called using the attribute notation.
There are two flavors: built-in methods (such as "append()" on lists)
and class instance methods. Built-in methods are described with the
types that support them.
If you access a method (a function defined in a class namespace)
through an instance, you get a special object: a *bound method* (also
called *instance method*) object. When called, it will add the "self"
argument to the argument list. Bound methods have two special read-
only attributes: "m.__self__" is the object on which the method
operates, and "m.__func__" is the function implementing the method.
Calling "m(arg-1, arg-2, ..., arg-n)" is completely equivalent to
calling "m.__func__(m.__self__, arg-1, arg-2, ..., arg-n)".
Like function objects, bound method objects support getting arbitrary
attributes. However, since method attributes are actually stored on
the underlying function object ("meth.__func__"), setting method
attributes on bound methods is disallowed. Attempting to set an
attribute on a method results in an "AttributeError" being raised. In
order to set a method attribute, you need to explicitly set it on the
underlying function object:
>>> class C:
... def method(self):
... pass
...
>>> c = C()
>>> c.method.whoami = 'my name is method' # can't set on the method
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'method' object has no attribute 'whoami'
>>> c.method.__func__.whoami = 'my name is method'
>>> c.method.whoami
'my name is method'
See The standard type hierarchy for more information.
u$ Modules
*******
The only special operation on a module is attribute access: "m.name",
where *m* is a module and *name* accesses a name defined in *m*’s
symbol table. Module attributes can be assigned to. (Note that the
"import" statement is not, strictly speaking, an operation on a module
object; "import foo" does not require a module object named *foo* to
exist, rather it requires an (external) *definition* for a module
named *foo* somewhere.)
A special attribute of every module is "__dict__". This is the
dictionary containing the module’s symbol table. Modifying this
dictionary will actually change the module’s symbol table, but direct
assignment to the "__dict__" attribute is not possible (you can write
"m.__dict__['a'] = 1", which defines "m.a" to be "1", but you can’t
write "m.__dict__ = {}"). Modifying "__dict__" directly is not
recommended.
Modules built into the interpreter are written like this: "<module
'sys' (built-in)>". If loaded from a file, they are written as
"<module 'os' from '/usr/local/lib/pythonX.Y/os.pyc'>".
u�Z Sequence Types — "list", "tuple", "range"
*****************************************
There are three basic sequence types: lists, tuples, and range
objects. Additional sequence types tailored for processing of binary
data and text strings are described in dedicated sections.
Common Sequence Operations
==========================
The operations in the following table are supported by most sequence
types, both mutable and immutable. The "collections.abc.Sequence" ABC
is provided to make it easier to correctly implement these operations
on custom sequence types.
This table lists the sequence operations sorted in ascending priority.
In the table, *s* and *t* are sequences of the same type, *n*, *i*,
*j* and *k* are integers and *x* is an arbitrary object that meets any
type and value restrictions imposed by *s*.
The "in" and "not in" operations have the same priorities as the
comparison operations. The "+" (concatenation) and "*" (repetition)
operations have the same priority as the corresponding numeric
operations. [3]
+----------------------------+----------------------------------+------------+
| Operation | Result | Notes |
|============================|==================================|============|
| "x in s" | "True" if an item of *s* is | (1) |
| | equal to *x*, else "False" | |
+----------------------------+----------------------------------+------------+
| "x not in s" | "False" if an item of *s* is | (1) |
| | equal to *x*, else "True" | |
+----------------------------+----------------------------------+------------+
| "s + t" | the concatenation of *s* and *t* | (6)(7) |
+----------------------------+----------------------------------+------------+
| "s * n" or "n * s" | equivalent to adding *s* to | (2)(7) |
| | itself *n* times | |
+----------------------------+----------------------------------+------------+
| "s[i]" | *i*th item of *s*, origin 0 | (3) |
+----------------------------+----------------------------------+------------+
| "s[i:j]" | slice of *s* from *i* to *j* | (3)(4) |
+----------------------------+----------------------------------+------------+
| "s[i:j:k]" | slice of *s* from *i* to *j* | (3)(5) |
| | with step *k* | |
+----------------------------+----------------------------------+------------+
| "len(s)" | length of *s* | |
+----------------------------+----------------------------------+------------+
| "min(s)" | smallest item of *s* | |
+----------------------------+----------------------------------+------------+
| "max(s)" | largest item of *s* | |
+----------------------------+----------------------------------+------------+
| "s.index(x[, i[, j]])" | index of the first occurrence of | (8) |
| | *x* in *s* (at or after index | |
| | *i* and before index *j*) | |
+----------------------------+----------------------------------+------------+
| "s.count(x)" | total number of occurrences of | |
| | *x* in *s* | |
+----------------------------+----------------------------------+------------+
Sequences of the same type also support comparisons. In particular,
tuples and lists are compared lexicographically by comparing
corresponding elements. This means that to compare equal, every
element must compare equal and the two sequences must be of the same
type and have the same length. (For full details see Comparisons in
the language reference.)
Notes:
1. While the "in" and "not in" operations are used only for simple
containment testing in the general case, some specialised sequences
(such as "str", "bytes" and "bytearray") also use them for
subsequence testing:
>>> "gg" in "eggs"
True
2. Values of *n* less than "0" are treated as "0" (which yields an
empty sequence of the same type as *s*). Note that items in the
sequence *s* are not copied; they are referenced multiple times.
This often haunts new Python programmers; consider:
>>> lists = [[]] * 3
>>> lists
[[], [], []]
>>> lists[0].append(3)
>>> lists
[[3], [3], [3]]
What has happened is that "[[]]" is a one-element list containing
an empty list, so all three elements of "[[]] * 3" are references
to this single empty list. Modifying any of the elements of
"lists" modifies this single list. You can create a list of
different lists this way:
>>> lists = [[] for i in range(3)]
>>> lists[0].append(3)
>>> lists[1].append(5)
>>> lists[2].append(7)
>>> lists
[[3], [5], [7]]
Further explanation is available in the FAQ entry How do I create a
multidimensional list?.
3. If *i* or *j* is negative, the index is relative to the end of
sequence *s*: "len(s) + i" or "len(s) + j" is substituted. But
note that "-0" is still "0".
4. The slice of *s* from *i* to *j* is defined as the sequence of
items with index *k* such that "i <= k < j". If *i* or *j* is
greater than "len(s)", use "len(s)". If *i* is omitted or "None",
use "0". If *j* is omitted or "None", use "len(s)". If *i* is
greater than or equal to *j*, the slice is empty.
5. The slice of *s* from *i* to *j* with step *k* is defined as the
sequence of items with index "x = i + n*k" such that "0 <= n <
(j-i)/k". In other words, the indices are "i", "i+k", "i+2*k",
"i+3*k" and so on, stopping when *j* is reached (but never
including *j*). When *k* is positive, *i* and *j* are reduced to
"len(s)" if they are greater. When *k* is negative, *i* and *j* are
reduced to "len(s) - 1" if they are greater. If *i* or *j* are
omitted or "None", they become “end” values (which end depends on
the sign of *k*). Note, *k* cannot be zero. If *k* is "None", it
is treated like "1".
6. Concatenating immutable sequences always results in a new object.
This means that building up a sequence by repeated concatenation
will have a quadratic runtime cost in the total sequence length.
To get a linear runtime cost, you must switch to one of the
alternatives below:
* if concatenating "str" objects, you can build a list and use
"str.join()" at the end or else write to an "io.StringIO"
instance and retrieve its value when complete
* if concatenating "bytes" objects, you can similarly use
"bytes.join()" or "io.BytesIO", or you can do in-place
concatenation with a "bytearray" object. "bytearray" objects are
mutable and have an efficient overallocation mechanism
* if concatenating "tuple" objects, extend a "list" instead
* for other types, investigate the relevant class documentation
7. Some sequence types (such as "range") only support item sequences
that follow specific patterns, and hence don’t support sequence
concatenation or repetition.
8. "index" raises "ValueError" when *x* is not found in *s*. Not all
implementations support passing the additional arguments *i* and
*j*. These arguments allow efficient searching of subsections of
the sequence. Passing the extra arguments is roughly equivalent to
using "s[i:j].index(x)", only without copying any data and with the
returned index being relative to the start of the sequence rather
than the start of the slice.
Immutable Sequence Types
========================
The only operation that immutable sequence types generally implement
that is not also implemented by mutable sequence types is support for
the "hash()" built-in.
This support allows immutable sequences, such as "tuple" instances, to
be used as "dict" keys and stored in "set" and "frozenset" instances.
Attempting to hash an immutable sequence that contains unhashable
values will result in "TypeError".
Mutable Sequence Types
======================
The operations in the following table are defined on mutable sequence
types. The "collections.abc.MutableSequence" ABC is provided to make
it easier to correctly implement these operations on custom sequence
types.
In the table *s* is an instance of a mutable sequence type, *t* is any
iterable object and *x* is an arbitrary object that meets any type and
value restrictions imposed by *s* (for example, "bytearray" only
accepts integers that meet the value restriction "0 <= x <= 255").
+--------------------------------+----------------------------------+-----------------------+
| Operation | Result | Notes |
|================================|==================================|=======================|
| "s[i] = x" | item *i* of *s* is replaced by | |
| | *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j] = t" | slice of *s* from *i* to *j* is | |
| | replaced by the contents of the | |
| | iterable *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j]" | same as "s[i:j] = []" | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j:k] = t" | the elements of "s[i:j:k]" are | (1) |
| | replaced by those of *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j:k]" | removes the elements of | |
| | "s[i:j:k]" from the list | |
+--------------------------------+----------------------------------+-----------------------+
| "s.append(x)" | appends *x* to the end of the | |
| | sequence (same as | |
| | "s[len(s):len(s)] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.clear()" | removes all items from *s* (same | (5) |
| | as "del s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.copy()" | creates a shallow copy of *s* | (5) |
| | (same as "s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.extend(t)" or "s += t" | extends *s* with the contents of | |
| | *t* (for the most part the same | |
| | as "s[len(s):len(s)] = t") | |
+--------------------------------+----------------------------------+-----------------------+
| "s *= n" | updates *s* with its contents | (6) |
| | repeated *n* times | |
+--------------------------------+----------------------------------+-----------------------+
| "s.insert(i, x)" | inserts *x* into *s* at the | |
| | index given by *i* (same as | |
| | "s[i:i] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.pop()" or "s.pop(i)" | retrieves the item at *i* and | (2) |
| | also removes it from *s* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.remove(x)" | remove the first item from *s* | (3) |
| | where "s[i]" is equal to *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.reverse()" | reverses the items of *s* in | (4) |
| | place | |
+--------------------------------+----------------------------------+-----------------------+
Notes:
1. *t* must have the same length as the slice it is replacing.
2. The optional argument *i* defaults to "-1", so that by default the
last item is removed and returned.
3. "remove()" raises "ValueError" when *x* is not found in *s*.
4. The "reverse()" method modifies the sequence in place for economy
of space when reversing a large sequence. To remind users that it
operates by side effect, it does not return the reversed sequence.
5. "clear()" and "copy()" are included for consistency with the
interfaces of mutable containers that don’t support slicing
operations (such as "dict" and "set"). "copy()" is not part of the
"collections.abc.MutableSequence" ABC, but most concrete mutable
sequence classes provide it.
New in version 3.3: "clear()" and "copy()" methods.
6. The value *n* is an integer, or an object implementing
"__index__()". Zero and negative values of *n* clear the sequence.
Items in the sequence are not copied; they are referenced multiple
times, as explained for "s * n" under Common Sequence Operations.
Lists
=====
Lists are mutable sequences, typically used to store collections of
homogeneous items (where the precise degree of similarity will vary by
application).
class list([iterable])
Lists may be constructed in several ways:
* Using a pair of square brackets to denote the empty list: "[]"
* Using square brackets, separating items with commas: "[a]", "[a,
b, c]"
* Using a list comprehension: "[x for x in iterable]"
* Using the type constructor: "list()" or "list(iterable)"
The constructor builds a list whose items are the same and in the
same order as *iterable*’s items. *iterable* may be either a
sequence, a container that supports iteration, or an iterator
object. If *iterable* is already a list, a copy is made and
returned, similar to "iterable[:]". For example, "list('abc')"
returns "['a', 'b', 'c']" and "list( (1, 2, 3) )" returns "[1, 2,
3]". If no argument is given, the constructor creates a new empty
list, "[]".
Many other operations also produce lists, including the "sorted()"
built-in.
Lists implement all of the common and mutable sequence operations.
Lists also provide the following additional method:
sort(*, key=None, reverse=False)
This method sorts the list in place, using only "<" comparisons
between items. Exceptions are not suppressed - if any comparison
operations fail, the entire sort operation will fail (and the
list will likely be left in a partially modified state).
"sort()" accepts two arguments that can only be passed by
keyword (keyword-only arguments):
*key* specifies a function of one argument that is used to
extract a comparison key from each list element (for example,
"key=str.lower"). The key corresponding to each item in the list
is calculated once and then used for the entire sorting process.
The default value of "None" means that list items are sorted
directly without calculating a separate key value.
The "functools.cmp_to_key()" utility is available to convert a
2.x style *cmp* function to a *key* function.
*reverse* is a boolean value. If set to "True", then the list
elements are sorted as if each comparison were reversed.
This method modifies the sequence in place for economy of space
when sorting a large sequence. To remind users that it operates
by side effect, it does not return the sorted sequence (use
"sorted()" to explicitly request a new sorted list instance).
The "sort()" method is guaranteed to be stable. A sort is
stable if it guarantees not to change the relative order of
elements that compare equal — this is helpful for sorting in
multiple passes (for example, sort by department, then by salary
grade).
For sorting examples and a brief sorting tutorial, see Sorting
HOW TO.
**CPython implementation detail:** While a list is being sorted,
the effect of attempting to mutate, or even inspect, the list is
undefined. The C implementation of Python makes the list appear
empty for the duration, and raises "ValueError" if it can detect
that the list has been mutated during a sort.
Tuples
======
Tuples are immutable sequences, typically used to store collections of
heterogeneous data (such as the 2-tuples produced by the "enumerate()"
built-in). Tuples are also used for cases where an immutable sequence
of homogeneous data is needed (such as allowing storage in a "set" or
"dict" instance).
class tuple([iterable])
Tuples may be constructed in a number of ways:
* Using a pair of parentheses to denote the empty tuple: "()"
* Using a trailing comma for a singleton tuple: "a," or "(a,)"
* Separating items with commas: "a, b, c" or "(a, b, c)"
* Using the "tuple()" built-in: "tuple()" or "tuple(iterable)"
The constructor builds a tuple whose items are the same and in the
same order as *iterable*’s items. *iterable* may be either a
sequence, a container that supports iteration, or an iterator
object. If *iterable* is already a tuple, it is returned
unchanged. For example, "tuple('abc')" returns "('a', 'b', 'c')"
and "tuple( [1, 2, 3] )" returns "(1, 2, 3)". If no argument is
given, the constructor creates a new empty tuple, "()".
Note that it is actually the comma which makes a tuple, not the
parentheses. The parentheses are optional, except in the empty
tuple case, or when they are needed to avoid syntactic ambiguity.
For example, "f(a, b, c)" is a function call with three arguments,
while "f((a, b, c))" is a function call with a 3-tuple as the sole
argument.
Tuples implement all of the common sequence operations.
For heterogeneous collections of data where access by name is clearer
than access by index, "collections.namedtuple()" may be a more
appropriate choice than a simple tuple object.
Ranges
======
The "range" type represents an immutable sequence of numbers and is
commonly used for looping a specific number of times in "for" loops.
class range(stop)
class range(start, stop[, step])
The arguments to the range constructor must be integers (either
built-in "int" or any object that implements the "__index__"
special method). If the *step* argument is omitted, it defaults to
"1". If the *start* argument is omitted, it defaults to "0". If
*step* is zero, "ValueError" is raised.
For a positive *step*, the contents of a range "r" are determined
by the formula "r[i] = start + step*i" where "i >= 0" and "r[i] <
stop".
For a negative *step*, the contents of the range are still
determined by the formula "r[i] = start + step*i", but the
constraints are "i >= 0" and "r[i] > stop".
A range object will be empty if "r[0]" does not meet the value
constraint. Ranges do support negative indices, but these are
interpreted as indexing from the end of the sequence determined by
the positive indices.
Ranges containing absolute values larger than "sys.maxsize" are
permitted but some features (such as "len()") may raise
"OverflowError".
Range examples:
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> list(range(1, 11))
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> list(range(0, 30, 5))
[0, 5, 10, 15, 20, 25]
>>> list(range(0, 10, 3))
[0, 3, 6, 9]
>>> list(range(0, -10, -1))
[0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
>>> list(range(0))
[]
>>> list(range(1, 0))
[]
Ranges implement all of the common sequence operations except
concatenation and repetition (due to the fact that range objects
can only represent sequences that follow a strict pattern and
repetition and concatenation will usually violate that pattern).
start
The value of the *start* parameter (or "0" if the parameter was
not supplied)
stop
The value of the *stop* parameter
step
The value of the *step* parameter (or "1" if the parameter was
not supplied)
The advantage of the "range" type over a regular "list" or "tuple" is
that a "range" object will always take the same (small) amount of
memory, no matter the size of the range it represents (as it only
stores the "start", "stop" and "step" values, calculating individual
items and subranges as needed).
Range objects implement the "collections.abc.Sequence" ABC, and
provide features such as containment tests, element index lookup,
slicing and support for negative indices (see Sequence Types — list,
tuple, range):
>>> r = range(0, 20, 2)
>>> r
range(0, 20, 2)
>>> 11 in r
False
>>> 10 in r
True
>>> r.index(10)
5
>>> r[5]
10
>>> r[:5]
range(0, 10, 2)
>>> r[-1]
18
Testing range objects for equality with "==" and "!=" compares them as
sequences. That is, two range objects are considered equal if they
represent the same sequence of values. (Note that two range objects
that compare equal might have different "start", "stop" and "step"
attributes, for example "range(0) == range(2, 1, 3)" or "range(0, 3,
2) == range(0, 4, 2)".)
Changed in version 3.2: Implement the Sequence ABC. Support slicing
and negative indices. Test "int" objects for membership in constant
time instead of iterating through all items.
Changed in version 3.3: Define ‘==’ and ‘!=’ to compare range objects
based on the sequence of values they define (instead of comparing
based on object identity).
New in version 3.3: The "start", "stop" and "step" attributes.
See also:
* The linspace recipe shows how to implement a lazy version of range
suitable for floating point applications.
u� Mutable Sequence Types
**********************
The operations in the following table are defined on mutable sequence
types. The "collections.abc.MutableSequence" ABC is provided to make
it easier to correctly implement these operations on custom sequence
types.
In the table *s* is an instance of a mutable sequence type, *t* is any
iterable object and *x* is an arbitrary object that meets any type and
value restrictions imposed by *s* (for example, "bytearray" only
accepts integers that meet the value restriction "0 <= x <= 255").
+--------------------------------+----------------------------------+-----------------------+
| Operation | Result | Notes |
|================================|==================================|=======================|
| "s[i] = x" | item *i* of *s* is replaced by | |
| | *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j] = t" | slice of *s* from *i* to *j* is | |
| | replaced by the contents of the | |
| | iterable *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j]" | same as "s[i:j] = []" | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j:k] = t" | the elements of "s[i:j:k]" are | (1) |
| | replaced by those of *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j:k]" | removes the elements of | |
| | "s[i:j:k]" from the list | |
+--------------------------------+----------------------------------+-----------------------+
| "s.append(x)" | appends *x* to the end of the | |
| | sequence (same as | |
| | "s[len(s):len(s)] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.clear()" | removes all items from *s* (same | (5) |
| | as "del s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.copy()" | creates a shallow copy of *s* | (5) |
| | (same as "s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.extend(t)" or "s += t" | extends *s* with the contents of | |
| | *t* (for the most part the same | |
| | as "s[len(s):len(s)] = t") | |
+--------------------------------+----------------------------------+-----------------------+
| "s *= n" | updates *s* with its contents | (6) |
| | repeated *n* times | |
+--------------------------------+----------------------------------+-----------------------+
| "s.insert(i, x)" | inserts *x* into *s* at the | |
| | index given by *i* (same as | |
| | "s[i:i] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.pop()" or "s.pop(i)" | retrieves the item at *i* and | (2) |
| | also removes it from *s* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.remove(x)" | remove the first item from *s* | (3) |
| | where "s[i]" is equal to *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.reverse()" | reverses the items of *s* in | (4) |
| | place | |
+--------------------------------+----------------------------------+-----------------------+
Notes:
1. *t* must have the same length as the slice it is replacing.
2. The optional argument *i* defaults to "-1", so that by default the
last item is removed and returned.
3. "remove()" raises "ValueError" when *x* is not found in *s*.
4. The "reverse()" method modifies the sequence in place for economy
of space when reversing a large sequence. To remind users that it
operates by side effect, it does not return the reversed sequence.
5. "clear()" and "copy()" are included for consistency with the
interfaces of mutable containers that don’t support slicing
operations (such as "dict" and "set"). "copy()" is not part of the
"collections.abc.MutableSequence" ABC, but most concrete mutable
sequence classes provide it.
New in version 3.3: "clear()" and "copy()" methods.
6. The value *n* is an integer, or an object implementing
"__index__()". Zero and negative values of *n* clear the sequence.
Items in the sequence are not copied; they are referenced multiple
times, as explained for "s * n" under Common Sequence Operations.
a~ Unary arithmetic and bitwise operations
***************************************
All unary arithmetic and bitwise operations have the same priority:
u_expr ::= power | "-" u_expr | "+" u_expr | "~" u_expr
The unary "-" (minus) operator yields the negation of its numeric
argument.
The unary "+" (plus) operator yields its numeric argument unchanged.
The unary "~" (invert) operator yields the bitwise inversion of its
integer argument. The bitwise inversion of "x" is defined as
"-(x+1)". It only applies to integral numbers.
In all three cases, if the argument does not have the proper type, a
"TypeError" exception is raised.
u� The "while" statement
*********************
The "while" statement is used for repeated execution as long as an
expression is true:
while_stmt ::= "while" assignment_expression ":" suite
["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the
first suite; if the expression is false (which may be the first time
it is tested) the suite of the "else" clause, if present, is executed
and the loop terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and goes back
to testing the expression.
uM The "with" statement
********************
The "with" statement is used to wrap the execution of a block with
methods defined by a context manager (see section With Statement
Context Managers). This allows common "try"…"except"…"finally" usage
patterns to be encapsulated for convenient reuse.
with_stmt ::= "with" with_item ("," with_item)* ":" suite
with_item ::= expression ["as" target]
The execution of the "with" statement with one “item” proceeds as
follows:
1. The context expression (the expression given in the "with_item") is
evaluated to obtain a context manager.
2. The context manager’s "__enter__()" is loaded for later use.
3. The context manager’s "__exit__()" is loaded for later use.
4. The context manager’s "__enter__()" method is invoked.
5. If a target was included in the "with" statement, the return value
from "__enter__()" is assigned to it.
Note:
The "with" statement guarantees that if the "__enter__()" method
returns without an error, then "__exit__()" will always be
called. Thus, if an error occurs during the assignment to the
target list, it will be treated the same as an error occurring
within the suite would be. See step 6 below.
6. The suite is executed.
7. The context manager’s "__exit__()" method is invoked. If an
exception caused the suite to be exited, its type, value, and
traceback are passed as arguments to "__exit__()". Otherwise, three
"None" arguments are supplied.
If the suite was exited due to an exception, and the return value
from the "__exit__()" method was false, the exception is reraised.
If the return value was true, the exception is suppressed, and
execution continues with the statement following the "with"
statement.
If the suite was exited for any reason other than an exception, the
return value from "__exit__()" is ignored, and execution proceeds
at the normal location for the kind of exit that was taken.
The following code:
with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
With more than one item, the context managers are processed as if
multiple "with" statements were nested:
with A() as a, B() as b:
SUITE
is semantically equivalent to:
with A() as a:
with B() as b:
SUITE
Changed in version 3.1: Support for multiple context expressions.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
a, The "yield" statement
*********************
yield_stmt ::= yield_expression
A "yield" statement is semantically equivalent to a yield expression.
The yield statement can be used to omit the parentheses that would
otherwise be required in the equivalent yield expression statement.
For example, the yield statements
yield <expr>
yield from <expr>
are equivalent to the yield expression statements
(yield <expr>)
(yield from <expr>)
Yield expressions and statements are only used when defining a
*generator* function, and are only used in the body of the generator
function. Using yield in a function definition is sufficient to cause
that definition to create a generator function instead of a normal
function.
For full details of "yield" semantics, refer to the Yield expressions
section.
)O�assertZ
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customizationZdebugger�del�dictzdynamic-features�else�
exceptionsZ execmodelZ exprlistsZfloating�forZ
formatstringsZfunction�globalz
id-classesZ identifiers�ifZ imaginary�import�inZintegers�lambdaZlistsZnaming�nonlocalZnumbersz
numeric-typesZobjectszoperator-summary�passZpower�raise�returnzsequence-typesZshiftingZslicingsZ specialattrsZ specialnameszstring-methodsZstringsZ
subscriptions�truth�try�typesZtypesfunctionsZ typesmappingZ typesmethodsZ typesmodulesZtypesseqztypesseq-mutableZunary�while�with�yieldN)Ztopics� r r �)/usr/lib64/python3.8/pydoc_data/topics.py�<module> s ' } ( @ X 1 =` b Q> J : 3M D% I
H+1 &. L N 3"o# p3= ^ a i9 ; K9% H h� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �PK 86�\ �W �~ �~ topics.cpython-38.pycnu �[��� U
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d d d
ddddddddddddddd d d d d d!d"d#d$d%d&d'd(d d)d*d+d,d-d.d/d0d1d2d3d4d5d6d7d8d9d:d;d<d=d>d?d@dAdBdCdDdEdFdGdHdIdJdKdLdMdN�OZ dOS )Pau The "assert" statement
**********************
Assert statements are a convenient way to insert debugging assertions
into a program:
assert_stmt ::= "assert" expression ["," expression]
The simple form, "assert expression", is equivalent to
if __debug__:
if not expression: raise AssertionError
The extended form, "assert expression1, expression2", is equivalent to
if __debug__:
if not expression1: raise AssertionError(expression2)
These equivalences assume that "__debug__" and "AssertionError" refer
to the built-in variables with those names. In the current
implementation, the built-in variable "__debug__" is "True" under
normal circumstances, "False" when optimization is requested (command
line option "-O"). The current code generator emits no code for an
assert statement when optimization is requested at compile time. Note
that it is unnecessary to include the source code for the expression
that failed in the error message; it will be displayed as part of the
stack trace.
Assignments to "__debug__" are illegal. The value for the built-in
variable is determined when the interpreter starts.
u�, Assignment statements
*********************
Assignment statements are used to (re)bind names to values and to
modify attributes or items of mutable objects:
assignment_stmt ::= (target_list "=")+ (starred_expression | yield_expression)
target_list ::= target ("," target)* [","]
target ::= identifier
| "(" [target_list] ")"
| "[" [target_list] "]"
| attributeref
| subscription
| slicing
| "*" target
(See section Primaries for the syntax definitions for *attributeref*,
*subscription*, and *slicing*.)
An assignment statement evaluates the expression list (remember that
this can be a single expression or a comma-separated list, the latter
yielding a tuple) and assigns the single resulting object to each of
the target lists, from left to right.
Assignment is defined recursively depending on the form of the target
(list). When a target is part of a mutable object (an attribute
reference, subscription or slicing), the mutable object must
ultimately perform the assignment and decide about its validity, and
may raise an exception if the assignment is unacceptable. The rules
observed by various types and the exceptions raised are given with the
definition of the object types (see section The standard type
hierarchy).
Assignment of an object to a target list, optionally enclosed in
parentheses or square brackets, is recursively defined as follows.
* If the target list is a single target with no trailing comma,
optionally in parentheses, the object is assigned to that target.
* Else: The object must be an iterable with the same number of items
as there are targets in the target list, and the items are assigned,
from left to right, to the corresponding targets.
* If the target list contains one target prefixed with an asterisk,
called a “starred” target: The object must be an iterable with at
least as many items as there are targets in the target list, minus
one. The first items of the iterable are assigned, from left to
right, to the targets before the starred target. The final items
of the iterable are assigned to the targets after the starred
target. A list of the remaining items in the iterable is then
assigned to the starred target (the list can be empty).
* Else: The object must be an iterable with the same number of items
as there are targets in the target list, and the items are
assigned, from left to right, to the corresponding targets.
Assignment of an object to a single target is recursively defined as
follows.
* If the target is an identifier (name):
* If the name does not occur in a "global" or "nonlocal" statement
in the current code block: the name is bound to the object in the
current local namespace.
* Otherwise: the name is bound to the object in the global namespace
or the outer namespace determined by "nonlocal", respectively.
The name is rebound if it was already bound. This may cause the
reference count for the object previously bound to the name to reach
zero, causing the object to be deallocated and its destructor (if it
has one) to be called.
* If the target is an attribute reference: The primary expression in
the reference is evaluated. It should yield an object with
assignable attributes; if this is not the case, "TypeError" is
raised. That object is then asked to assign the assigned object to
the given attribute; if it cannot perform the assignment, it raises
an exception (usually but not necessarily "AttributeError").
Note: If the object is a class instance and the attribute reference
occurs on both sides of the assignment operator, the right-hand side
expression, "a.x" can access either an instance attribute or (if no
instance attribute exists) a class attribute. The left-hand side
target "a.x" is always set as an instance attribute, creating it if
necessary. Thus, the two occurrences of "a.x" do not necessarily
refer to the same attribute: if the right-hand side expression
refers to a class attribute, the left-hand side creates a new
instance attribute as the target of the assignment:
class Cls:
x = 3 # class variable
inst = Cls()
inst.x = inst.x + 1 # writes inst.x as 4 leaving Cls.x as 3
This description does not necessarily apply to descriptor
attributes, such as properties created with "property()".
* If the target is a subscription: The primary expression in the
reference is evaluated. It should yield either a mutable sequence
object (such as a list) or a mapping object (such as a dictionary).
Next, the subscript expression is evaluated.
If the primary is a mutable sequence object (such as a list), the
subscript must yield an integer. If it is negative, the sequence’s
length is added to it. The resulting value must be a nonnegative
integer less than the sequence’s length, and the sequence is asked
to assign the assigned object to its item with that index. If the
index is out of range, "IndexError" is raised (assignment to a
subscripted sequence cannot add new items to a list).
If the primary is a mapping object (such as a dictionary), the
subscript must have a type compatible with the mapping’s key type,
and the mapping is then asked to create a key/datum pair which maps
the subscript to the assigned object. This can either replace an
existing key/value pair with the same key value, or insert a new
key/value pair (if no key with the same value existed).
For user-defined objects, the "__setitem__()" method is called with
appropriate arguments.
* If the target is a slicing: The primary expression in the reference
is evaluated. It should yield a mutable sequence object (such as a
list). The assigned object should be a sequence object of the same
type. Next, the lower and upper bound expressions are evaluated,
insofar they are present; defaults are zero and the sequence’s
length. The bounds should evaluate to integers. If either bound is
negative, the sequence’s length is added to it. The resulting
bounds are clipped to lie between zero and the sequence’s length,
inclusive. Finally, the sequence object is asked to replace the
slice with the items of the assigned sequence. The length of the
slice may be different from the length of the assigned sequence,
thus changing the length of the target sequence, if the target
sequence allows it.
**CPython implementation detail:** In the current implementation, the
syntax for targets is taken to be the same as for expressions, and
invalid syntax is rejected during the code generation phase, causing
less detailed error messages.
Although the definition of assignment implies that overlaps between
the left-hand side and the right-hand side are ‘simultaneous’ (for
example "a, b = b, a" swaps two variables), overlaps *within* the
collection of assigned-to variables occur left-to-right, sometimes
resulting in confusion. For instance, the following program prints
"[0, 2]":
x = [0, 1]
i = 0
i, x[i] = 1, 2 # i is updated, then x[i] is updated
print(x)
See also:
**PEP 3132** - Extended Iterable Unpacking
The specification for the "*target" feature.
Augmented assignment statements
===============================
Augmented assignment is the combination, in a single statement, of a
binary operation and an assignment statement:
augmented_assignment_stmt ::= augtarget augop (expression_list | yield_expression)
augtarget ::= identifier | attributeref | subscription | slicing
augop ::= "+=" | "-=" | "*=" | "@=" | "/=" | "//=" | "%=" | "**="
| ">>=" | "<<=" | "&=" | "^=" | "|="
(See section Primaries for the syntax definitions of the last three
symbols.)
An augmented assignment evaluates the target (which, unlike normal
assignment statements, cannot be an unpacking) and the expression
list, performs the binary operation specific to the type of assignment
on the two operands, and assigns the result to the original target.
The target is only evaluated once.
An augmented assignment expression like "x += 1" can be rewritten as
"x = x + 1" to achieve a similar, but not exactly equal effect. In the
augmented version, "x" is only evaluated once. Also, when possible,
the actual operation is performed *in-place*, meaning that rather than
creating a new object and assigning that to the target, the old object
is modified instead.
Unlike normal assignments, augmented assignments evaluate the left-
hand side *before* evaluating the right-hand side. For example, "a[i]
+= f(x)" first looks-up "a[i]", then it evaluates "f(x)" and performs
the addition, and lastly, it writes the result back to "a[i]".
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments. Similarly,
with the exception of the possible *in-place* behavior, the binary
operation performed by augmented assignment is the same as the normal
binary operations.
For targets which are attribute references, the same caveat about
class and instance attributes applies as for regular assignments.
Annotated assignment statements
===============================
*Annotation* assignment is the combination, in a single statement, of
a variable or attribute annotation and an optional assignment
statement:
annotated_assignment_stmt ::= augtarget ":" expression
["=" (starred_expression | yield_expression)]
The difference from normal Assignment statements is that only single
target is allowed.
For simple names as assignment targets, if in class or module scope,
the annotations are evaluated and stored in a special class or module
attribute "__annotations__" that is a dictionary mapping from variable
names (mangled if private) to evaluated annotations. This attribute is
writable and is automatically created at the start of class or module
body execution, if annotations are found statically.
For expressions as assignment targets, the annotations are evaluated
if in class or module scope, but not stored.
If a name is annotated in a function scope, then this name is local
for that scope. Annotations are never evaluated and stored in function
scopes.
If the right hand side is present, an annotated assignment performs
the actual assignment before evaluating annotations (where
applicable). If the right hand side is not present for an expression
target, then the interpreter evaluates the target except for the last
"__setitem__()" or "__setattr__()" call.
See also:
**PEP 526** - Syntax for Variable Annotations
The proposal that added syntax for annotating the types of
variables (including class variables and instance variables),
instead of expressing them through comments.
**PEP 484** - Type hints
The proposal that added the "typing" module to provide a standard
syntax for type annotations that can be used in static analysis
tools and IDEs.
Changed in version 3.8: Now annotated assignments allow same
expressions in the right hand side as the regular assignments.
Previously, some expressions (like un-parenthesized tuple expressions)
caused a syntax error.
u>
Coroutines
**********
New in version 3.5.
Coroutine function definition
=============================
async_funcdef ::= [decorators] "async" "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
Execution of Python coroutines can be suspended and resumed at many
points (see *coroutine*). Inside the body of a coroutine function,
"await" and "async" identifiers become reserved keywords; "await"
expressions, "async for" and "async with" can only be used in
coroutine function bodies.
Functions defined with "async def" syntax are always coroutine
functions, even if they do not contain "await" or "async" keywords.
It is a "SyntaxError" to use a "yield from" expression inside the body
of a coroutine function.
An example of a coroutine function:
async def func(param1, param2):
do_stuff()
await some_coroutine()
The "async for" statement
=========================
async_for_stmt ::= "async" for_stmt
An *asynchronous iterable* is able to call asynchronous code in its
*iter* implementation, and *asynchronous iterator* can call
asynchronous code in its *next* method.
The "async for" statement allows convenient iteration over
asynchronous iterators.
The following code:
async for TARGET in ITER:
SUITE
else:
SUITE2
Is semantically equivalent to:
iter = (ITER)
iter = type(iter).__aiter__(iter)
running = True
while running:
try:
TARGET = await type(iter).__anext__(iter)
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2
See also "__aiter__()" and "__anext__()" for details.
It is a "SyntaxError" to use an "async for" statement outside the body
of a coroutine function.
The "async with" statement
==========================
async_with_stmt ::= "async" with_stmt
An *asynchronous context manager* is a *context manager* that is able
to suspend execution in its *enter* and *exit* methods.
The following code:
async with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
aexit = type(manager).__aexit__
aenter = type(manager).__aenter__
value = await aenter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
See also "__aenter__()" and "__aexit__()" for details.
It is a "SyntaxError" to use an "async with" statement outside the
body of a coroutine function.
See also:
**PEP 492** - Coroutines with async and await syntax
The proposal that made coroutines a proper standalone concept in
Python, and added supporting syntax.
-[ Footnotes ]-
[1] The exception is propagated to the invocation stack unless there
is a "finally" clause which happens to raise another exception.
That new exception causes the old one to be lost.
[2] A string literal appearing as the first statement in the function
body is transformed into the function’s "__doc__" attribute and
therefore the function’s *docstring*.
[3] A string literal appearing as the first statement in the class
body is transformed into the namespace’s "__doc__" item and
therefore the class’s *docstring*.
a� Identifiers (Names)
*******************
An identifier occurring as an atom is a name. See section Identifiers
and keywords for lexical definition and section Naming and binding for
documentation of naming and binding.
When the name is bound to an object, evaluation of the atom yields
that object. When a name is not bound, an attempt to evaluate it
raises a "NameError" exception.
**Private name mangling:** When an identifier that textually occurs in
a class definition begins with two or more underscore characters and
does not end in two or more underscores, it is considered a *private
name* of that class. Private names are transformed to a longer form
before code is generated for them. The transformation inserts the
class name, with leading underscores removed and a single underscore
inserted, in front of the name. For example, the identifier "__spam"
occurring in a class named "Ham" will be transformed to "_Ham__spam".
This transformation is independent of the syntactical context in which
the identifier is used. If the transformed name is extremely long
(longer than 255 characters), implementation defined truncation may
happen. If the class name consists only of underscores, no
transformation is done.
u
Literals
********
Python supports string and bytes literals and various numeric
literals:
literal ::= stringliteral | bytesliteral
| integer | floatnumber | imagnumber
Evaluation of a literal yields an object of the given type (string,
bytes, integer, floating point number, complex number) with the given
value. The value may be approximated in the case of floating point
and imaginary (complex) literals. See section Literals for details.
All literals correspond to immutable data types, and hence the
object’s identity is less important than its value. Multiple
evaluations of literals with the same value (either the same
occurrence in the program text or a different occurrence) may obtain
the same object or a different object with the same value.
uA7 Customizing attribute access
****************************
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of "x.name") for
class instances.
object.__getattr__(self, name)
Called when the default attribute access fails with an
"AttributeError" (either "__getattribute__()" raises an
"AttributeError" because *name* is not an instance attribute or an
attribute in the class tree for "self"; or "__get__()" of a *name*
property raises "AttributeError"). This method should either
return the (computed) attribute value or raise an "AttributeError"
exception.
Note that if the attribute is found through the normal mechanism,
"__getattr__()" is not called. (This is an intentional asymmetry
between "__getattr__()" and "__setattr__()".) This is done both for
efficiency reasons and because otherwise "__getattr__()" would have
no way to access other attributes of the instance. Note that at
least for instance variables, you can fake total control by not
inserting any values in the instance attribute dictionary (but
instead inserting them in another object). See the
"__getattribute__()" method below for a way to actually get total
control over attribute access.
object.__getattribute__(self, name)
Called unconditionally to implement attribute accesses for
instances of the class. If the class also defines "__getattr__()",
the latter will not be called unless "__getattribute__()" either
calls it explicitly or raises an "AttributeError". This method
should return the (computed) attribute value or raise an
"AttributeError" exception. In order to avoid infinite recursion in
this method, its implementation should always call the base class
method with the same name to access any attributes it needs, for
example, "object.__getattribute__(self, name)".
Note:
This method may still be bypassed when looking up special methods
as the result of implicit invocation via language syntax or
built-in functions. See Special method lookup.
For certain sensitive attribute accesses, raises an auditing event
"object.__getattr__" with arguments "obj" and "name".
object.__setattr__(self, name, value)
Called when an attribute assignment is attempted. This is called
instead of the normal mechanism (i.e. store the value in the
instance dictionary). *name* is the attribute name, *value* is the
value to be assigned to it.
If "__setattr__()" wants to assign to an instance attribute, it
should call the base class method with the same name, for example,
"object.__setattr__(self, name, value)".
For certain sensitive attribute assignments, raises an auditing
event "object.__setattr__" with arguments "obj", "name", "value".
object.__delattr__(self, name)
Like "__setattr__()" but for attribute deletion instead of
assignment. This should only be implemented if "del obj.name" is
meaningful for the object.
For certain sensitive attribute deletions, raises an auditing event
"object.__delattr__" with arguments "obj" and "name".
object.__dir__(self)
Called when "dir()" is called on the object. A sequence must be
returned. "dir()" converts the returned sequence to a list and
sorts it.
Customizing module attribute access
===================================
Special names "__getattr__" and "__dir__" can be also used to
customize access to module attributes. The "__getattr__" function at
the module level should accept one argument which is the name of an
attribute and return the computed value or raise an "AttributeError".
If an attribute is not found on a module object through the normal
lookup, i.e. "object.__getattribute__()", then "__getattr__" is
searched in the module "__dict__" before raising an "AttributeError".
If found, it is called with the attribute name and the result is
returned.
The "__dir__" function should accept no arguments, and return a
sequence of strings that represents the names accessible on module. If
present, this function overrides the standard "dir()" search on a
module.
For a more fine grained customization of the module behavior (setting
attributes, properties, etc.), one can set the "__class__" attribute
of a module object to a subclass of "types.ModuleType". For example:
import sys
from types import ModuleType
class VerboseModule(ModuleType):
def __repr__(self):
return f'Verbose {self.__name__}'
def __setattr__(self, attr, value):
print(f'Setting {attr}...')
super().__setattr__(attr, value)
sys.modules[__name__].__class__ = VerboseModule
Note:
Defining module "__getattr__" and setting module "__class__" only
affect lookups made using the attribute access syntax – directly
accessing the module globals (whether by code within the module, or
via a reference to the module’s globals dictionary) is unaffected.
Changed in version 3.5: "__class__" module attribute is now writable.
New in version 3.7: "__getattr__" and "__dir__" module attributes.
See also:
**PEP 562** - Module __getattr__ and __dir__
Describes the "__getattr__" and "__dir__" functions on modules.
Implementing Descriptors
========================
The following methods only apply when an instance of the class
containing the method (a so-called *descriptor* class) appears in an
*owner* class (the descriptor must be in either the owner’s class
dictionary or in the class dictionary for one of its parents). In the
examples below, “the attribute” refers to the attribute whose name is
the key of the property in the owner class’ "__dict__".
object.__get__(self, instance, owner=None)
Called to get the attribute of the owner class (class attribute
access) or of an instance of that class (instance attribute
access). The optional *owner* argument is the owner class, while
*instance* is the instance that the attribute was accessed through,
or "None" when the attribute is accessed through the *owner*.
This method should return the computed attribute value or raise an
"AttributeError" exception.
**PEP 252** specifies that "__get__()" is callable with one or two
arguments. Python’s own built-in descriptors support this
specification; however, it is likely that some third-party tools
have descriptors that require both arguments. Python’s own
"__getattribute__()" implementation always passes in both arguments
whether they are required or not.
object.__set__(self, instance, value)
Called to set the attribute on an instance *instance* of the owner
class to a new value, *value*.
Note, adding "__set__()" or "__delete__()" changes the kind of
descriptor to a “data descriptor”. See Invoking Descriptors for
more details.
object.__delete__(self, instance)
Called to delete the attribute on an instance *instance* of the
owner class.
object.__set_name__(self, owner, name)
Called at the time the owning class *owner* is created. The
descriptor has been assigned to *name*.
Note:
"__set_name__()" is only called implicitly as part of the "type"
constructor, so it will need to be called explicitly with the
appropriate parameters when a descriptor is added to a class
after initial creation:
class A:
pass
descr = custom_descriptor()
A.attr = descr
descr.__set_name__(A, 'attr')
See Creating the class object for more details.
New in version 3.6.
The attribute "__objclass__" is interpreted by the "inspect" module as
specifying the class where this object was defined (setting this
appropriately can assist in runtime introspection of dynamic class
attributes). For callables, it may indicate that an instance of the
given type (or a subclass) is expected or required as the first
positional argument (for example, CPython sets this attribute for
unbound methods that are implemented in C).
Invoking Descriptors
====================
In general, a descriptor is an object attribute with “binding
behavior”, one whose attribute access has been overridden by methods
in the descriptor protocol: "__get__()", "__set__()", and
"__delete__()". If any of those methods are defined for an object, it
is said to be a descriptor.
The default behavior for attribute access is to get, set, or delete
the attribute from an object’s dictionary. For instance, "a.x" has a
lookup chain starting with "a.__dict__['x']", then
"type(a).__dict__['x']", and continuing through the base classes of
"type(a)" excluding metaclasses.
However, if the looked-up value is an object defining one of the
descriptor methods, then Python may override the default behavior and
invoke the descriptor method instead. Where this occurs in the
precedence chain depends on which descriptor methods were defined and
how they were called.
The starting point for descriptor invocation is a binding, "a.x". How
the arguments are assembled depends on "a":
Direct Call
The simplest and least common call is when user code directly
invokes a descriptor method: "x.__get__(a)".
Instance Binding
If binding to an object instance, "a.x" is transformed into the
call: "type(a).__dict__['x'].__get__(a, type(a))".
Class Binding
If binding to a class, "A.x" is transformed into the call:
"A.__dict__['x'].__get__(None, A)".
Super Binding
If "a" is an instance of "super", then the binding "super(B,
obj).m()" searches "obj.__class__.__mro__" for the base class "A"
immediately preceding "B" and then invokes the descriptor with the
call: "A.__dict__['m'].__get__(obj, obj.__class__)".
For instance bindings, the precedence of descriptor invocation depends
on which descriptor methods are defined. A descriptor can define any
combination of "__get__()", "__set__()" and "__delete__()". If it
does not define "__get__()", then accessing the attribute will return
the descriptor object itself unless there is a value in the object’s
instance dictionary. If the descriptor defines "__set__()" and/or
"__delete__()", it is a data descriptor; if it defines neither, it is
a non-data descriptor. Normally, data descriptors define both
"__get__()" and "__set__()", while non-data descriptors have just the
"__get__()" method. Data descriptors with "__set__()" and "__get__()"
defined always override a redefinition in an instance dictionary. In
contrast, non-data descriptors can be overridden by instances.
Python methods (including "staticmethod()" and "classmethod()") are
implemented as non-data descriptors. Accordingly, instances can
redefine and override methods. This allows individual instances to
acquire behaviors that differ from other instances of the same class.
The "property()" function is implemented as a data descriptor.
Accordingly, instances cannot override the behavior of a property.
__slots__
=========
*__slots__* allow us to explicitly declare data members (like
properties) and deny the creation of *__dict__* and *__weakref__*
(unless explicitly declared in *__slots__* or available in a parent.)
The space saved over using *__dict__* can be significant. Attribute
lookup speed can be significantly improved as well.
object.__slots__
This class variable can be assigned a string, iterable, or sequence
of strings with variable names used by instances. *__slots__*
reserves space for the declared variables and prevents the
automatic creation of *__dict__* and *__weakref__* for each
instance.
Notes on using *__slots__*
--------------------------
* When inheriting from a class without *__slots__*, the *__dict__* and
*__weakref__* attribute of the instances will always be accessible.
* Without a *__dict__* variable, instances cannot be assigned new
variables not listed in the *__slots__* definition. Attempts to
assign to an unlisted variable name raises "AttributeError". If
dynamic assignment of new variables is desired, then add
"'__dict__'" to the sequence of strings in the *__slots__*
declaration.
* Without a *__weakref__* variable for each instance, classes defining
*__slots__* do not support weak references to its instances. If weak
reference support is needed, then add "'__weakref__'" to the
sequence of strings in the *__slots__* declaration.
* *__slots__* are implemented at the class level by creating
descriptors (Implementing Descriptors) for each variable name. As a
result, class attributes cannot be used to set default values for
instance variables defined by *__slots__*; otherwise, the class
attribute would overwrite the descriptor assignment.
* The action of a *__slots__* declaration is not limited to the class
where it is defined. *__slots__* declared in parents are available
in child classes. However, child subclasses will get a *__dict__*
and *__weakref__* unless they also define *__slots__* (which should
only contain names of any *additional* slots).
* If a class defines a slot also defined in a base class, the instance
variable defined by the base class slot is inaccessible (except by
retrieving its descriptor directly from the base class). This
renders the meaning of the program undefined. In the future, a
check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from
“variable-length” built-in types such as "int", "bytes" and "tuple".
* Any non-string iterable may be assigned to *__slots__*. Mappings may
also be used; however, in the future, special meaning may be
assigned to the values corresponding to each key.
* *__class__* assignment works only if both classes have the same
*__slots__*.
* Multiple inheritance with multiple slotted parent classes can be
used, but only one parent is allowed to have attributes created by
slots (the other bases must have empty slot layouts) - violations
raise "TypeError".
* If an iterator is used for *__slots__* then a descriptor is created
for each of the iterator’s values. However, the *__slots__*
attribute will be an empty iterator.
a� Attribute references
********************
An attribute reference is a primary followed by a period and a name:
attributeref ::= primary "." identifier
The primary must evaluate to an object of a type that supports
attribute references, which most objects do. This object is then
asked to produce the attribute whose name is the identifier. This
production can be customized by overriding the "__getattr__()" method.
If this attribute is not available, the exception "AttributeError" is
raised. Otherwise, the type and value of the object produced is
determined by the object. Multiple evaluations of the same attribute
reference may yield different objects.
a� Augmented assignment statements
*******************************
Augmented assignment is the combination, in a single statement, of a
binary operation and an assignment statement:
augmented_assignment_stmt ::= augtarget augop (expression_list | yield_expression)
augtarget ::= identifier | attributeref | subscription | slicing
augop ::= "+=" | "-=" | "*=" | "@=" | "/=" | "//=" | "%=" | "**="
| ">>=" | "<<=" | "&=" | "^=" | "|="
(See section Primaries for the syntax definitions of the last three
symbols.)
An augmented assignment evaluates the target (which, unlike normal
assignment statements, cannot be an unpacking) and the expression
list, performs the binary operation specific to the type of assignment
on the two operands, and assigns the result to the original target.
The target is only evaluated once.
An augmented assignment expression like "x += 1" can be rewritten as
"x = x + 1" to achieve a similar, but not exactly equal effect. In the
augmented version, "x" is only evaluated once. Also, when possible,
the actual operation is performed *in-place*, meaning that rather than
creating a new object and assigning that to the target, the old object
is modified instead.
Unlike normal assignments, augmented assignments evaluate the left-
hand side *before* evaluating the right-hand side. For example, "a[i]
+= f(x)" first looks-up "a[i]", then it evaluates "f(x)" and performs
the addition, and lastly, it writes the result back to "a[i]".
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments. Similarly,
with the exception of the possible *in-place* behavior, the binary
operation performed by augmented assignment is the same as the normal
binary operations.
For targets which are attribute references, the same caveat about
class and instance attributes applies as for regular assignments.
z�Await expression
****************
Suspend the execution of *coroutine* on an *awaitable* object. Can
only be used inside a *coroutine function*.
await_expr ::= "await" primary
New in version 3.5.
uj Binary arithmetic operations
****************************
The binary arithmetic operations have the conventional priority
levels. Note that some of these operations also apply to certain non-
numeric types. Apart from the power operator, there are only two
levels, one for multiplicative operators and one for additive
operators:
m_expr ::= u_expr | m_expr "*" u_expr | m_expr "@" m_expr |
m_expr "//" u_expr | m_expr "/" u_expr |
m_expr "%" u_expr
a_expr ::= m_expr | a_expr "+" m_expr | a_expr "-" m_expr
The "*" (multiplication) operator yields the product of its arguments.
The arguments must either both be numbers, or one argument must be an
integer and the other must be a sequence. In the former case, the
numbers are converted to a common type and then multiplied together.
In the latter case, sequence repetition is performed; a negative
repetition factor yields an empty sequence.
The "@" (at) operator is intended to be used for matrix
multiplication. No builtin Python types implement this operator.
New in version 3.5.
The "/" (division) and "//" (floor division) operators yield the
quotient of their arguments. The numeric arguments are first
converted to a common type. Division of integers yields a float, while
floor division of integers results in an integer; the result is that
of mathematical division with the ‘floor’ function applied to the
result. Division by zero raises the "ZeroDivisionError" exception.
The "%" (modulo) operator yields the remainder from the division of
the first argument by the second. The numeric arguments are first
converted to a common type. A zero right argument raises the
"ZeroDivisionError" exception. The arguments may be floating point
numbers, e.g., "3.14%0.7" equals "0.34" (since "3.14" equals "4*0.7 +
0.34".) The modulo operator always yields a result with the same sign
as its second operand (or zero); the absolute value of the result is
strictly smaller than the absolute value of the second operand [1].
The floor division and modulo operators are connected by the following
identity: "x == (x//y)*y + (x%y)". Floor division and modulo are also
connected with the built-in function "divmod()": "divmod(x, y) ==
(x//y, x%y)". [2].
In addition to performing the modulo operation on numbers, the "%"
operator is also overloaded by string objects to perform old-style
string formatting (also known as interpolation). The syntax for
string formatting is described in the Python Library Reference,
section printf-style String Formatting.
The floor division operator, the modulo operator, and the "divmod()"
function are not defined for complex numbers. Instead, convert to a
floating point number using the "abs()" function if appropriate.
The "+" (addition) operator yields the sum of its arguments. The
arguments must either both be numbers or both be sequences of the same
type. In the former case, the numbers are converted to a common type
and then added together. In the latter case, the sequences are
concatenated.
The "-" (subtraction) operator yields the difference of its arguments.
The numeric arguments are first converted to a common type.
a$ Binary bitwise operations
*************************
Each of the three bitwise operations has a different priority level:
and_expr ::= shift_expr | and_expr "&" shift_expr
xor_expr ::= and_expr | xor_expr "^" and_expr
or_expr ::= xor_expr | or_expr "|" xor_expr
The "&" operator yields the bitwise AND of its arguments, which must
be integers.
The "^" operator yields the bitwise XOR (exclusive OR) of its
arguments, which must be integers.
The "|" operator yields the bitwise (inclusive) OR of its arguments,
which must be integers.
u� Code Objects
************
Code objects are used by the implementation to represent “pseudo-
compiled” executable Python code such as a function body. They differ
from function objects because they don’t contain a reference to their
global execution environment. Code objects are returned by the built-
in "compile()" function and can be extracted from function objects
through their "__code__" attribute. See also the "code" module.
Accessing "__code__" raises an auditing event "object.__getattr__"
with arguments "obj" and ""__code__"".
A code object can be executed or evaluated by passing it (instead of a
source string) to the "exec()" or "eval()" built-in functions.
See The standard type hierarchy for more information.
a. The Ellipsis Object
*******************
This object is commonly used by slicing (see Slicings). It supports
no special operations. There is exactly one ellipsis object, named
"Ellipsis" (a built-in name). "type(Ellipsis)()" produces the
"Ellipsis" singleton.
It is written as "Ellipsis" or "...".
u The Null Object
***************
This object is returned by functions that don’t explicitly return a
value. It supports no special operations. There is exactly one null
object, named "None" (a built-in name). "type(None)()" produces the
same singleton.
It is written as "None".
u5 Type Objects
************
Type objects represent the various object types. An object’s type is
accessed by the built-in function "type()". There are no special
operations on types. The standard module "types" defines names for
all standard built-in types.
Types are written like this: "<class 'int'>".
a� Boolean operations
******************
or_test ::= and_test | or_test "or" and_test
and_test ::= not_test | and_test "and" not_test
not_test ::= comparison | "not" not_test
In the context of Boolean operations, and also when expressions are
used by control flow statements, the following values are interpreted
as false: "False", "None", numeric zero of all types, and empty
strings and containers (including strings, tuples, lists,
dictionaries, sets and frozensets). All other values are interpreted
as true. User-defined objects can customize their truth value by
providing a "__bool__()" method.
The operator "not" yields "True" if its argument is false, "False"
otherwise.
The expression "x and y" first evaluates *x*; if *x* is false, its
value is returned; otherwise, *y* is evaluated and the resulting value
is returned.
The expression "x or y" first evaluates *x*; if *x* is true, its value
is returned; otherwise, *y* is evaluated and the resulting value is
returned.
Note that neither "and" nor "or" restrict the value and type they
return to "False" and "True", but rather return the last evaluated
argument. This is sometimes useful, e.g., if "s" is a string that
should be replaced by a default value if it is empty, the expression
"s or 'foo'" yields the desired value. Because "not" has to create a
new value, it returns a boolean value regardless of the type of its
argument (for example, "not 'foo'" produces "False" rather than "''".)
a$ The "break" statement
*********************
break_stmt ::= "break"
"break" may only occur syntactically nested in a "for" or "while"
loop, but not nested in a function or class definition within that
loop.
It terminates the nearest enclosing loop, skipping the optional "else"
clause if the loop has one.
If a "for" loop is terminated by "break", the loop control target
keeps its current value.
When "break" passes control out of a "try" statement with a "finally"
clause, that "finally" clause is executed before really leaving the
loop.
u Emulating callable objects
**************************
object.__call__(self[, args...])
Called when the instance is “called” as a function; if this method
is defined, "x(arg1, arg2, ...)" roughly translates to
"type(x).__call__(x, arg1, ...)".
u� Calls
*****
A call calls a callable object (e.g., a *function*) with a possibly
empty series of *arguments*:
call ::= primary "(" [argument_list [","] | comprehension] ")"
argument_list ::= positional_arguments ["," starred_and_keywords]
["," keywords_arguments]
| starred_and_keywords ["," keywords_arguments]
| keywords_arguments
positional_arguments ::= positional_item ("," positional_item)*
positional_item ::= assignment_expression | "*" expression
starred_and_keywords ::= ("*" expression | keyword_item)
("," "*" expression | "," keyword_item)*
keywords_arguments ::= (keyword_item | "**" expression)
("," keyword_item | "," "**" expression)*
keyword_item ::= identifier "=" expression
An optional trailing comma may be present after the positional and
keyword arguments but does not affect the semantics.
The primary must evaluate to a callable object (user-defined
functions, built-in functions, methods of built-in objects, class
objects, methods of class instances, and all objects having a
"__call__()" method are callable). All argument expressions are
evaluated before the call is attempted. Please refer to section
Function definitions for the syntax of formal *parameter* lists.
If keyword arguments are present, they are first converted to
positional arguments, as follows. First, a list of unfilled slots is
created for the formal parameters. If there are N positional
arguments, they are placed in the first N slots. Next, for each
keyword argument, the identifier is used to determine the
corresponding slot (if the identifier is the same as the first formal
parameter name, the first slot is used, and so on). If the slot is
already filled, a "TypeError" exception is raised. Otherwise, the
value of the argument is placed in the slot, filling it (even if the
expression is "None", it fills the slot). When all arguments have
been processed, the slots that are still unfilled are filled with the
corresponding default value from the function definition. (Default
values are calculated, once, when the function is defined; thus, a
mutable object such as a list or dictionary used as default value will
be shared by all calls that don’t specify an argument value for the
corresponding slot; this should usually be avoided.) If there are any
unfilled slots for which no default value is specified, a "TypeError"
exception is raised. Otherwise, the list of filled slots is used as
the argument list for the call.
**CPython implementation detail:** An implementation may provide
built-in functions whose positional parameters do not have names, even
if they are ‘named’ for the purpose of documentation, and which
therefore cannot be supplied by keyword. In CPython, this is the case
for functions implemented in C that use "PyArg_ParseTuple()" to parse
their arguments.
If there are more positional arguments than there are formal parameter
slots, a "TypeError" exception is raised, unless a formal parameter
using the syntax "*identifier" is present; in this case, that formal
parameter receives a tuple containing the excess positional arguments
(or an empty tuple if there were no excess positional arguments).
If any keyword argument does not correspond to a formal parameter
name, a "TypeError" exception is raised, unless a formal parameter
using the syntax "**identifier" is present; in this case, that formal
parameter receives a dictionary containing the excess keyword
arguments (using the keywords as keys and the argument values as
corresponding values), or a (new) empty dictionary if there were no
excess keyword arguments.
If the syntax "*expression" appears in the function call, "expression"
must evaluate to an *iterable*. Elements from these iterables are
treated as if they were additional positional arguments. For the call
"f(x1, x2, *y, x3, x4)", if *y* evaluates to a sequence *y1*, …, *yM*,
this is equivalent to a call with M+4 positional arguments *x1*, *x2*,
*y1*, …, *yM*, *x3*, *x4*.
A consequence of this is that although the "*expression" syntax may
appear *after* explicit keyword arguments, it is processed *before*
the keyword arguments (and any "**expression" arguments – see below).
So:
>>> def f(a, b):
... print(a, b)
...
>>> f(b=1, *(2,))
2 1
>>> f(a=1, *(2,))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: f() got multiple values for keyword argument 'a'
>>> f(1, *(2,))
1 2
It is unusual for both keyword arguments and the "*expression" syntax
to be used in the same call, so in practice this confusion does not
arise.
If the syntax "**expression" appears in the function call,
"expression" must evaluate to a *mapping*, the contents of which are
treated as additional keyword arguments. If a keyword is already
present (as an explicit keyword argument, or from another unpacking),
a "TypeError" exception is raised.
Formal parameters using the syntax "*identifier" or "**identifier"
cannot be used as positional argument slots or as keyword argument
names.
Changed in version 3.5: Function calls accept any number of "*" and
"**" unpackings, positional arguments may follow iterable unpackings
("*"), and keyword arguments may follow dictionary unpackings ("**").
Originally proposed by **PEP 448**.
A call always returns some value, possibly "None", unless it raises an
exception. How this value is computed depends on the type of the
callable object.
If it is—
a user-defined function:
The code block for the function is executed, passing it the
argument list. The first thing the code block will do is bind the
formal parameters to the arguments; this is described in section
Function definitions. When the code block executes a "return"
statement, this specifies the return value of the function call.
a built-in function or method:
The result is up to the interpreter; see Built-in Functions for the
descriptions of built-in functions and methods.
a class object:
A new instance of that class is returned.
a class instance method:
The corresponding user-defined function is called, with an argument
list that is one longer than the argument list of the call: the
instance becomes the first argument.
a class instance:
The class must define a "__call__()" method; the effect is then the
same as if that method was called.
u Class definitions
*****************
A class definition defines a class object (see section The standard
type hierarchy):
classdef ::= [decorators] "class" classname [inheritance] ":" suite
inheritance ::= "(" [argument_list] ")"
classname ::= identifier
A class definition is an executable statement. The inheritance list
usually gives a list of base classes (see Metaclasses for more
advanced uses), so each item in the list should evaluate to a class
object which allows subclassing. Classes without an inheritance list
inherit, by default, from the base class "object"; hence,
class Foo:
pass
is equivalent to
class Foo(object):
pass
The class’s suite is then executed in a new execution frame (see
Naming and binding), using a newly created local namespace and the
original global namespace. (Usually, the suite contains mostly
function definitions.) When the class’s suite finishes execution, its
execution frame is discarded but its local namespace is saved. [3] A
class object is then created using the inheritance list for the base
classes and the saved local namespace for the attribute dictionary.
The class name is bound to this class object in the original local
namespace.
The order in which attributes are defined in the class body is
preserved in the new class’s "__dict__". Note that this is reliable
only right after the class is created and only for classes that were
defined using the definition syntax.
Class creation can be customized heavily using metaclasses.
Classes can also be decorated: just like when decorating functions,
@f1(arg)
@f2
class Foo: pass
is roughly equivalent to
class Foo: pass
Foo = f1(arg)(f2(Foo))
The evaluation rules for the decorator expressions are the same as for
function decorators. The result is then bound to the class name.
**Programmer’s note:** Variables defined in the class definition are
class attributes; they are shared by instances. Instance attributes
can be set in a method with "self.name = value". Both class and
instance attributes are accessible through the notation “"self.name"”,
and an instance attribute hides a class attribute with the same name
when accessed in this way. Class attributes can be used as defaults
for instance attributes, but using mutable values there can lead to
unexpected results. Descriptors can be used to create instance
variables with different implementation details.
See also:
**PEP 3115** - Metaclasses in Python 3000
The proposal that changed the declaration of metaclasses to the
current syntax, and the semantics for how classes with
metaclasses are constructed.
**PEP 3129** - Class Decorators
The proposal that added class decorators. Function and method
decorators were introduced in **PEP 318**.
u�' Comparisons
***********
Unlike C, all comparison operations in Python have the same priority,
which is lower than that of any arithmetic, shifting or bitwise
operation. Also unlike C, expressions like "a < b < c" have the
interpretation that is conventional in mathematics:
comparison ::= or_expr (comp_operator or_expr)*
comp_operator ::= "<" | ">" | "==" | ">=" | "<=" | "!="
| "is" ["not"] | ["not"] "in"
Comparisons yield boolean values: "True" or "False".
Comparisons can be chained arbitrarily, e.g., "x < y <= z" is
equivalent to "x < y and y <= z", except that "y" is evaluated only
once (but in both cases "z" is not evaluated at all when "x < y" is
found to be false).
Formally, if *a*, *b*, *c*, …, *y*, *z* are expressions and *op1*,
*op2*, …, *opN* are comparison operators, then "a op1 b op2 c ... y
opN z" is equivalent to "a op1 b and b op2 c and ... y opN z", except
that each expression is evaluated at most once.
Note that "a op1 b op2 c" doesn’t imply any kind of comparison between
*a* and *c*, so that, e.g., "x < y > z" is perfectly legal (though
perhaps not pretty).
Value comparisons
=================
The operators "<", ">", "==", ">=", "<=", and "!=" compare the values
of two objects. The objects do not need to have the same type.
Chapter Objects, values and types states that objects have a value (in
addition to type and identity). The value of an object is a rather
abstract notion in Python: For example, there is no canonical access
method for an object’s value. Also, there is no requirement that the
value of an object should be constructed in a particular way, e.g.
comprised of all its data attributes. Comparison operators implement a
particular notion of what the value of an object is. One can think of
them as defining the value of an object indirectly, by means of their
comparison implementation.
Because all types are (direct or indirect) subtypes of "object", they
inherit the default comparison behavior from "object". Types can
customize their comparison behavior by implementing *rich comparison
methods* like "__lt__()", described in Basic customization.
The default behavior for equality comparison ("==" and "!=") is based
on the identity of the objects. Hence, equality comparison of
instances with the same identity results in equality, and equality
comparison of instances with different identities results in
inequality. A motivation for this default behavior is the desire that
all objects should be reflexive (i.e. "x is y" implies "x == y").
A default order comparison ("<", ">", "<=", and ">=") is not provided;
an attempt raises "TypeError". A motivation for this default behavior
is the lack of a similar invariant as for equality.
The behavior of the default equality comparison, that instances with
different identities are always unequal, may be in contrast to what
types will need that have a sensible definition of object value and
value-based equality. Such types will need to customize their
comparison behavior, and in fact, a number of built-in types have done
that.
The following list describes the comparison behavior of the most
important built-in types.
* Numbers of built-in numeric types (Numeric Types — int, float,
complex) and of the standard library types "fractions.Fraction" and
"decimal.Decimal" can be compared within and across their types,
with the restriction that complex numbers do not support order
comparison. Within the limits of the types involved, they compare
mathematically (algorithmically) correct without loss of precision.
The not-a-number values "float('NaN')" and "decimal.Decimal('NaN')"
are special. Any ordered comparison of a number to a not-a-number
value is false. A counter-intuitive implication is that not-a-number
values are not equal to themselves. For example, if "x =
float('NaN')", "3 < x", "x < 3" and "x == x" are all false, while "x
!= x" is true. This behavior is compliant with IEEE 754.
* "None" and "NotImplemented" are singletons. **PEP 8** advises that
comparisons for singletons should always be done with "is" or "is
not", never the equality operators.
* Binary sequences (instances of "bytes" or "bytearray") can be
compared within and across their types. They compare
lexicographically using the numeric values of their elements.
* Strings (instances of "str") compare lexicographically using the
numerical Unicode code points (the result of the built-in function
"ord()") of their characters. [3]
Strings and binary sequences cannot be directly compared.
* Sequences (instances of "tuple", "list", or "range") can be compared
only within each of their types, with the restriction that ranges do
not support order comparison. Equality comparison across these
types results in inequality, and ordering comparison across these
types raises "TypeError".
Sequences compare lexicographically using comparison of
corresponding elements. The built-in containers typically assume
identical objects are equal to themselves. That lets them bypass
equality tests for identical objects to improve performance and to
maintain their internal invariants.
Lexicographical comparison between built-in collections works as
follows:
* For two collections to compare equal, they must be of the same
type, have the same length, and each pair of corresponding
elements must compare equal (for example, "[1,2] == (1,2)" is
false because the type is not the same).
* Collections that support order comparison are ordered the same as
their first unequal elements (for example, "[1,2,x] <= [1,2,y]"
has the same value as "x <= y"). If a corresponding element does
not exist, the shorter collection is ordered first (for example,
"[1,2] < [1,2,3]" is true).
* Mappings (instances of "dict") compare equal if and only if they
have equal *(key, value)* pairs. Equality comparison of the keys and
values enforces reflexivity.
Order comparisons ("<", ">", "<=", and ">=") raise "TypeError".
* Sets (instances of "set" or "frozenset") can be compared within and
across their types.
They define order comparison operators to mean subset and superset
tests. Those relations do not define total orderings (for example,
the two sets "{1,2}" and "{2,3}" are not equal, nor subsets of one
another, nor supersets of one another). Accordingly, sets are not
appropriate arguments for functions which depend on total ordering
(for example, "min()", "max()", and "sorted()" produce undefined
results given a list of sets as inputs).
Comparison of sets enforces reflexivity of its elements.
* Most other built-in types have no comparison methods implemented, so
they inherit the default comparison behavior.
User-defined classes that customize their comparison behavior should
follow some consistency rules, if possible:
* Equality comparison should be reflexive. In other words, identical
objects should compare equal:
"x is y" implies "x == y"
* Comparison should be symmetric. In other words, the following
expressions should have the same result:
"x == y" and "y == x"
"x != y" and "y != x"
"x < y" and "y > x"
"x <= y" and "y >= x"
* Comparison should be transitive. The following (non-exhaustive)
examples illustrate that:
"x > y and y > z" implies "x > z"
"x < y and y <= z" implies "x < z"
* Inverse comparison should result in the boolean negation. In other
words, the following expressions should have the same result:
"x == y" and "not x != y"
"x < y" and "not x >= y" (for total ordering)
"x > y" and "not x <= y" (for total ordering)
The last two expressions apply to totally ordered collections (e.g.
to sequences, but not to sets or mappings). See also the
"total_ordering()" decorator.
* The "hash()" result should be consistent with equality. Objects that
are equal should either have the same hash value, or be marked as
unhashable.
Python does not enforce these consistency rules. In fact, the
not-a-number values are an example for not following these rules.
Membership test operations
==========================
The operators "in" and "not in" test for membership. "x in s"
evaluates to "True" if *x* is a member of *s*, and "False" otherwise.
"x not in s" returns the negation of "x in s". All built-in sequences
and set types support this as well as dictionary, for which "in" tests
whether the dictionary has a given key. For container types such as
list, tuple, set, frozenset, dict, or collections.deque, the
expression "x in y" is equivalent to "any(x is e or x == e for e in
y)".
For the string and bytes types, "x in y" is "True" if and only if *x*
is a substring of *y*. An equivalent test is "y.find(x) != -1".
Empty strings are always considered to be a substring of any other
string, so """ in "abc"" will return "True".
For user-defined classes which define the "__contains__()" method, "x
in y" returns "True" if "y.__contains__(x)" returns a true value, and
"False" otherwise.
For user-defined classes which do not define "__contains__()" but do
define "__iter__()", "x in y" is "True" if some value "z", for which
the expression "x is z or x == z" is true, is produced while iterating
over "y". If an exception is raised during the iteration, it is as if
"in" raised that exception.
Lastly, the old-style iteration protocol is tried: if a class defines
"__getitem__()", "x in y" is "True" if and only if there is a non-
negative integer index *i* such that "x is y[i] or x == y[i]", and no
lower integer index raises the "IndexError" exception. (If any other
exception is raised, it is as if "in" raised that exception).
The operator "not in" is defined to have the inverse truth value of
"in".
Identity comparisons
====================
The operators "is" and "is not" test for an object’s identity: "x is
y" is true if and only if *x* and *y* are the same object. An
Object’s identity is determined using the "id()" function. "x is not
y" yields the inverse truth value. [4]
u�l Compound statements
*******************
Compound statements contain (groups of) other statements; they affect
or control the execution of those other statements in some way. In
general, compound statements span multiple lines, although in simple
incarnations a whole compound statement may be contained in one line.
The "if", "while" and "for" statements implement traditional control
flow constructs. "try" specifies exception handlers and/or cleanup
code for a group of statements, while the "with" statement allows the
execution of initialization and finalization code around a block of
code. Function and class definitions are also syntactically compound
statements.
A compound statement consists of one or more ‘clauses.’ A clause
consists of a header and a ‘suite.’ The clause headers of a
particular compound statement are all at the same indentation level.
Each clause header begins with a uniquely identifying keyword and ends
with a colon. A suite is a group of statements controlled by a
clause. A suite can be one or more semicolon-separated simple
statements on the same line as the header, following the header’s
colon, or it can be one or more indented statements on subsequent
lines. Only the latter form of a suite can contain nested compound
statements; the following is illegal, mostly because it wouldn’t be
clear to which "if" clause a following "else" clause would belong:
if test1: if test2: print(x)
Also note that the semicolon binds tighter than the colon in this
context, so that in the following example, either all or none of the
"print()" calls are executed:
if x < y < z: print(x); print(y); print(z)
Summarizing:
compound_stmt ::= if_stmt
| while_stmt
| for_stmt
| try_stmt
| with_stmt
| funcdef
| classdef
| async_with_stmt
| async_for_stmt
| async_funcdef
suite ::= stmt_list NEWLINE | NEWLINE INDENT statement+ DEDENT
statement ::= stmt_list NEWLINE | compound_stmt
stmt_list ::= simple_stmt (";" simple_stmt)* [";"]
Note that statements always end in a "NEWLINE" possibly followed by a
"DEDENT". Also note that optional continuation clauses always begin
with a keyword that cannot start a statement, thus there are no
ambiguities (the ‘dangling "else"’ problem is solved in Python by
requiring nested "if" statements to be indented).
The formatting of the grammar rules in the following sections places
each clause on a separate line for clarity.
The "if" statement
==================
The "if" statement is used for conditional execution:
if_stmt ::= "if" assignment_expression ":" suite
("elif" assignment_expression ":" suite)*
["else" ":" suite]
It selects exactly one of the suites by evaluating the expressions one
by one until one is found to be true (see section Boolean operations
for the definition of true and false); then that suite is executed
(and no other part of the "if" statement is executed or evaluated).
If all expressions are false, the suite of the "else" clause, if
present, is executed.
The "while" statement
=====================
The "while" statement is used for repeated execution as long as an
expression is true:
while_stmt ::= "while" assignment_expression ":" suite
["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the
first suite; if the expression is false (which may be the first time
it is tested) the suite of the "else" clause, if present, is executed
and the loop terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and goes back
to testing the expression.
The "for" statement
===================
The "for" statement is used to iterate over the elements of a sequence
(such as a string, tuple or list) or other iterable object:
for_stmt ::= "for" target_list "in" expression_list ":" suite
["else" ":" suite]
The expression list is evaluated once; it should yield an iterable
object. An iterator is created for the result of the
"expression_list". The suite is then executed once for each item
provided by the iterator, in the order returned by the iterator. Each
item in turn is assigned to the target list using the standard rules
for assignments (see Assignment statements), and then the suite is
executed. When the items are exhausted (which is immediately when the
sequence is empty or an iterator raises a "StopIteration" exception),
the suite in the "else" clause, if present, is executed, and the loop
terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and continues
with the next item, or with the "else" clause if there is no next
item.
The for-loop makes assignments to the variables in the target list.
This overwrites all previous assignments to those variables including
those made in the suite of the for-loop:
for i in range(10):
print(i)
i = 5 # this will not affect the for-loop
# because i will be overwritten with the next
# index in the range
Names in the target list are not deleted when the loop is finished,
but if the sequence is empty, they will not have been assigned to at
all by the loop. Hint: the built-in function "range()" returns an
iterator of integers suitable to emulate the effect of Pascal’s "for i
:= a to b do"; e.g., "list(range(3))" returns the list "[0, 1, 2]".
Note:
There is a subtlety when the sequence is being modified by the loop
(this can only occur for mutable sequences, e.g. lists). An
internal counter is used to keep track of which item is used next,
and this is incremented on each iteration. When this counter has
reached the length of the sequence the loop terminates. This means
that if the suite deletes the current (or a previous) item from the
sequence, the next item will be skipped (since it gets the index of
the current item which has already been treated). Likewise, if the
suite inserts an item in the sequence before the current item, the
current item will be treated again the next time through the loop.
This can lead to nasty bugs that can be avoided by making a
temporary copy using a slice of the whole sequence, e.g.,
for x in a[:]:
if x < 0: a.remove(x)
The "try" statement
===================
The "try" statement specifies exception handlers and/or cleanup code
for a group of statements:
try_stmt ::= try1_stmt | try2_stmt
try1_stmt ::= "try" ":" suite
("except" [expression ["as" identifier]] ":" suite)+
["else" ":" suite]
["finally" ":" suite]
try2_stmt ::= "try" ":" suite
"finally" ":" suite
The "except" clause(s) specify one or more exception handlers. When no
exception occurs in the "try" clause, no exception handler is
executed. When an exception occurs in the "try" suite, a search for an
exception handler is started. This search inspects the except clauses
in turn until one is found that matches the exception. An expression-
less except clause, if present, must be last; it matches any
exception. For an except clause with an expression, that expression
is evaluated, and the clause matches the exception if the resulting
object is “compatible” with the exception. An object is compatible
with an exception if it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base
class of the exception object.
If no except clause matches the exception, the search for an exception
handler continues in the surrounding code and on the invocation stack.
[1]
If the evaluation of an expression in the header of an except clause
raises an exception, the original search for a handler is canceled and
a search starts for the new exception in the surrounding code and on
the call stack (it is treated as if the entire "try" statement raised
the exception).
When a matching except clause is found, the exception is assigned to
the target specified after the "as" keyword in that except clause, if
present, and the except clause’s suite is executed. All except
clauses must have an executable block. When the end of this block is
reached, execution continues normally after the entire try statement.
(This means that if two nested handlers exist for the same exception,
and the exception occurs in the try clause of the inner handler, the
outer handler will not handle the exception.)
When an exception has been assigned using "as target", it is cleared
at the end of the except clause. This is as if
except E as N:
foo
was translated to
except E as N:
try:
foo
finally:
del N
This means the exception must be assigned to a different name to be
able to refer to it after the except clause. Exceptions are cleared
because with the traceback attached to them, they form a reference
cycle with the stack frame, keeping all locals in that frame alive
until the next garbage collection occurs.
Before an except clause’s suite is executed, details about the
exception are stored in the "sys" module and can be accessed via
"sys.exc_info()". "sys.exc_info()" returns a 3-tuple consisting of the
exception class, the exception instance and a traceback object (see
section The standard type hierarchy) identifying the point in the
program where the exception occurred. "sys.exc_info()" values are
restored to their previous values (before the call) when returning
from a function that handled an exception.
The optional "else" clause is executed if the control flow leaves the
"try" suite, no exception was raised, and no "return", "continue", or
"break" statement was executed. Exceptions in the "else" clause are
not handled by the preceding "except" clauses.
If "finally" is present, it specifies a ‘cleanup’ handler. The "try"
clause is executed, including any "except" and "else" clauses. If an
exception occurs in any of the clauses and is not handled, the
exception is temporarily saved. The "finally" clause is executed. If
there is a saved exception it is re-raised at the end of the "finally"
clause. If the "finally" clause raises another exception, the saved
exception is set as the context of the new exception. If the "finally"
clause executes a "return", "break" or "continue" statement, the saved
exception is discarded:
>>> def f():
... try:
... 1/0
... finally:
... return 42
...
>>> f()
42
The exception information is not available to the program during
execution of the "finally" clause.
When a "return", "break" or "continue" statement is executed in the
"try" suite of a "try"…"finally" statement, the "finally" clause is
also executed ‘on the way out.’
The return value of a function is determined by the last "return"
statement executed. Since the "finally" clause always executes, a
"return" statement executed in the "finally" clause will always be the
last one executed:
>>> def foo():
... try:
... return 'try'
... finally:
... return 'finally'
...
>>> foo()
'finally'
Additional information on exceptions can be found in section
Exceptions, and information on using the "raise" statement to generate
exceptions may be found in section The raise statement.
Changed in version 3.8: Prior to Python 3.8, a "continue" statement
was illegal in the "finally" clause due to a problem with the
implementation.
The "with" statement
====================
The "with" statement is used to wrap the execution of a block with
methods defined by a context manager (see section With Statement
Context Managers). This allows common "try"…"except"…"finally" usage
patterns to be encapsulated for convenient reuse.
with_stmt ::= "with" with_item ("," with_item)* ":" suite
with_item ::= expression ["as" target]
The execution of the "with" statement with one “item” proceeds as
follows:
1. The context expression (the expression given in the "with_item") is
evaluated to obtain a context manager.
2. The context manager’s "__enter__()" is loaded for later use.
3. The context manager’s "__exit__()" is loaded for later use.
4. The context manager’s "__enter__()" method is invoked.
5. If a target was included in the "with" statement, the return value
from "__enter__()" is assigned to it.
Note:
The "with" statement guarantees that if the "__enter__()" method
returns without an error, then "__exit__()" will always be
called. Thus, if an error occurs during the assignment to the
target list, it will be treated the same as an error occurring
within the suite would be. See step 6 below.
6. The suite is executed.
7. The context manager’s "__exit__()" method is invoked. If an
exception caused the suite to be exited, its type, value, and
traceback are passed as arguments to "__exit__()". Otherwise, three
"None" arguments are supplied.
If the suite was exited due to an exception, and the return value
from the "__exit__()" method was false, the exception is reraised.
If the return value was true, the exception is suppressed, and
execution continues with the statement following the "with"
statement.
If the suite was exited for any reason other than an exception, the
return value from "__exit__()" is ignored, and execution proceeds
at the normal location for the kind of exit that was taken.
The following code:
with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
With more than one item, the context managers are processed as if
multiple "with" statements were nested:
with A() as a, B() as b:
SUITE
is semantically equivalent to:
with A() as a:
with B() as b:
SUITE
Changed in version 3.1: Support for multiple context expressions.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
Function definitions
====================
A function definition defines a user-defined function object (see
section The standard type hierarchy):
funcdef ::= [decorators] "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
decorators ::= decorator+
decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name ::= identifier ("." identifier)*
parameter_list ::= defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]]
| parameter_list_no_posonly
parameter_list_no_posonly ::= defparameter ("," defparameter)* ["," [parameter_list_starargs]]
| parameter_list_starargs
parameter_list_starargs ::= "*" [parameter] ("," defparameter)* ["," ["**" parameter [","]]]
| "**" parameter [","]
parameter ::= identifier [":" expression]
defparameter ::= parameter ["=" expression]
funcname ::= identifier
A function definition is an executable statement. Its execution binds
the function name in the current local namespace to a function object
(a wrapper around the executable code for the function). This
function object contains a reference to the current global namespace
as the global namespace to be used when the function is called.
The function definition does not execute the function body; this gets
executed only when the function is called. [2]
A function definition may be wrapped by one or more *decorator*
expressions. Decorator expressions are evaluated when the function is
defined, in the scope that contains the function definition. The
result must be a callable, which is invoked with the function object
as the only argument. The returned value is bound to the function name
instead of the function object. Multiple decorators are applied in
nested fashion. For example, the following code
@f1(arg)
@f2
def func(): pass
is roughly equivalent to
def func(): pass
func = f1(arg)(f2(func))
except that the original function is not temporarily bound to the name
"func".
When one or more *parameters* have the form *parameter* "="
*expression*, the function is said to have “default parameter values.”
For a parameter with a default value, the corresponding *argument* may
be omitted from a call, in which case the parameter’s default value is
substituted. If a parameter has a default value, all following
parameters up until the “"*"” must also have a default value — this is
a syntactic restriction that is not expressed by the grammar.
**Default parameter values are evaluated from left to right when the
function definition is executed.** This means that the expression is
evaluated once, when the function is defined, and that the same “pre-
computed” value is used for each call. This is especially important
to understand when a default parameter is a mutable object, such as a
list or a dictionary: if the function modifies the object (e.g. by
appending an item to a list), the default value is in effect modified.
This is generally not what was intended. A way around this is to use
"None" as the default, and explicitly test for it in the body of the
function, e.g.:
def whats_on_the_telly(penguin=None):
if penguin is None:
penguin = []
penguin.append("property of the zoo")
return penguin
Function call semantics are described in more detail in section Calls.
A function call always assigns values to all parameters mentioned in
the parameter list, either from positional arguments, from keyword
arguments, or from default values. If the form “"*identifier"” is
present, it is initialized to a tuple receiving any excess positional
parameters, defaulting to the empty tuple. If the form
“"**identifier"” is present, it is initialized to a new ordered
mapping receiving any excess keyword arguments, defaulting to a new
empty mapping of the same type. Parameters after “"*"” or
“"*identifier"” are keyword-only parameters and may only be passed by
keyword arguments. Parameters before “"/"” are positional-only
parameters and may only be passed by positional arguments.
Changed in version 3.8: The "/" function parameter syntax may be used
to indicate positional-only parameters. See **PEP 570** for details.
Parameters may have an *annotation* of the form “": expression"”
following the parameter name. Any parameter may have an annotation,
even those of the form "*identifier" or "**identifier". Functions may
have “return” annotation of the form “"-> expression"” after the
parameter list. These annotations can be any valid Python expression.
The presence of annotations does not change the semantics of a
function. The annotation values are available as values of a
dictionary keyed by the parameters’ names in the "__annotations__"
attribute of the function object. If the "annotations" import from
"__future__" is used, annotations are preserved as strings at runtime
which enables postponed evaluation. Otherwise, they are evaluated
when the function definition is executed. In this case annotations
may be evaluated in a different order than they appear in the source
code.
It is also possible to create anonymous functions (functions not bound
to a name), for immediate use in expressions. This uses lambda
expressions, described in section Lambdas. Note that the lambda
expression is merely a shorthand for a simplified function definition;
a function defined in a “"def"” statement can be passed around or
assigned to another name just like a function defined by a lambda
expression. The “"def"” form is actually more powerful since it
allows the execution of multiple statements and annotations.
**Programmer’s note:** Functions are first-class objects. A “"def"”
statement executed inside a function definition defines a local
function that can be returned or passed around. Free variables used
in the nested function can access the local variables of the function
containing the def. See section Naming and binding for details.
See also:
**PEP 3107** - Function Annotations
The original specification for function annotations.
**PEP 484** - Type Hints
Definition of a standard meaning for annotations: type hints.
**PEP 526** - Syntax for Variable Annotations
Ability to type hint variable declarations, including class
variables and instance variables
**PEP 563** - Postponed Evaluation of Annotations
Support for forward references within annotations by preserving
annotations in a string form at runtime instead of eager
evaluation.
Class definitions
=================
A class definition defines a class object (see section The standard
type hierarchy):
classdef ::= [decorators] "class" classname [inheritance] ":" suite
inheritance ::= "(" [argument_list] ")"
classname ::= identifier
A class definition is an executable statement. The inheritance list
usually gives a list of base classes (see Metaclasses for more
advanced uses), so each item in the list should evaluate to a class
object which allows subclassing. Classes without an inheritance list
inherit, by default, from the base class "object"; hence,
class Foo:
pass
is equivalent to
class Foo(object):
pass
The class’s suite is then executed in a new execution frame (see
Naming and binding), using a newly created local namespace and the
original global namespace. (Usually, the suite contains mostly
function definitions.) When the class’s suite finishes execution, its
execution frame is discarded but its local namespace is saved. [3] A
class object is then created using the inheritance list for the base
classes and the saved local namespace for the attribute dictionary.
The class name is bound to this class object in the original local
namespace.
The order in which attributes are defined in the class body is
preserved in the new class’s "__dict__". Note that this is reliable
only right after the class is created and only for classes that were
defined using the definition syntax.
Class creation can be customized heavily using metaclasses.
Classes can also be decorated: just like when decorating functions,
@f1(arg)
@f2
class Foo: pass
is roughly equivalent to
class Foo: pass
Foo = f1(arg)(f2(Foo))
The evaluation rules for the decorator expressions are the same as for
function decorators. The result is then bound to the class name.
**Programmer’s note:** Variables defined in the class definition are
class attributes; they are shared by instances. Instance attributes
can be set in a method with "self.name = value". Both class and
instance attributes are accessible through the notation “"self.name"”,
and an instance attribute hides a class attribute with the same name
when accessed in this way. Class attributes can be used as defaults
for instance attributes, but using mutable values there can lead to
unexpected results. Descriptors can be used to create instance
variables with different implementation details.
See also:
**PEP 3115** - Metaclasses in Python 3000
The proposal that changed the declaration of metaclasses to the
current syntax, and the semantics for how classes with
metaclasses are constructed.
**PEP 3129** - Class Decorators
The proposal that added class decorators. Function and method
decorators were introduced in **PEP 318**.
Coroutines
==========
New in version 3.5.
Coroutine function definition
-----------------------------
async_funcdef ::= [decorators] "async" "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
Execution of Python coroutines can be suspended and resumed at many
points (see *coroutine*). Inside the body of a coroutine function,
"await" and "async" identifiers become reserved keywords; "await"
expressions, "async for" and "async with" can only be used in
coroutine function bodies.
Functions defined with "async def" syntax are always coroutine
functions, even if they do not contain "await" or "async" keywords.
It is a "SyntaxError" to use a "yield from" expression inside the body
of a coroutine function.
An example of a coroutine function:
async def func(param1, param2):
do_stuff()
await some_coroutine()
The "async for" statement
-------------------------
async_for_stmt ::= "async" for_stmt
An *asynchronous iterable* is able to call asynchronous code in its
*iter* implementation, and *asynchronous iterator* can call
asynchronous code in its *next* method.
The "async for" statement allows convenient iteration over
asynchronous iterators.
The following code:
async for TARGET in ITER:
SUITE
else:
SUITE2
Is semantically equivalent to:
iter = (ITER)
iter = type(iter).__aiter__(iter)
running = True
while running:
try:
TARGET = await type(iter).__anext__(iter)
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2
See also "__aiter__()" and "__anext__()" for details.
It is a "SyntaxError" to use an "async for" statement outside the body
of a coroutine function.
The "async with" statement
--------------------------
async_with_stmt ::= "async" with_stmt
An *asynchronous context manager* is a *context manager* that is able
to suspend execution in its *enter* and *exit* methods.
The following code:
async with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
aexit = type(manager).__aexit__
aenter = type(manager).__aenter__
value = await aenter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
See also "__aenter__()" and "__aexit__()" for details.
It is a "SyntaxError" to use an "async with" statement outside the
body of a coroutine function.
See also:
**PEP 492** - Coroutines with async and await syntax
The proposal that made coroutines a proper standalone concept in
Python, and added supporting syntax.
-[ Footnotes ]-
[1] The exception is propagated to the invocation stack unless there
is a "finally" clause which happens to raise another exception.
That new exception causes the old one to be lost.
[2] A string literal appearing as the first statement in the function
body is transformed into the function’s "__doc__" attribute and
therefore the function’s *docstring*.
[3] A string literal appearing as the first statement in the class
body is transformed into the namespace’s "__doc__" item and
therefore the class’s *docstring*.
u� With Statement Context Managers
*******************************
A *context manager* is an object that defines the runtime context to
be established when executing a "with" statement. The context manager
handles the entry into, and the exit from, the desired runtime context
for the execution of the block of code. Context managers are normally
invoked using the "with" statement (described in section The with
statement), but can also be used by directly invoking their methods.
Typical uses of context managers include saving and restoring various
kinds of global state, locking and unlocking resources, closing opened
files, etc.
For more information on context managers, see Context Manager Types.
object.__enter__(self)
Enter the runtime context related to this object. The "with"
statement will bind this method’s return value to the target(s)
specified in the "as" clause of the statement, if any.
object.__exit__(self, exc_type, exc_value, traceback)
Exit the runtime context related to this object. The parameters
describe the exception that caused the context to be exited. If the
context was exited without an exception, all three arguments will
be "None".
If an exception is supplied, and the method wishes to suppress the
exception (i.e., prevent it from being propagated), it should
return a true value. Otherwise, the exception will be processed
normally upon exit from this method.
Note that "__exit__()" methods should not reraise the passed-in
exception; this is the caller’s responsibility.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
a� The "continue" statement
************************
continue_stmt ::= "continue"
"continue" may only occur syntactically nested in a "for" or "while"
loop, but not nested in a function or class definition within that
loop. It continues with the next cycle of the nearest enclosing loop.
When "continue" passes control out of a "try" statement with a
"finally" clause, that "finally" clause is executed before really
starting the next loop cycle.
u� Arithmetic conversions
**********************
When a description of an arithmetic operator below uses the phrase
“the numeric arguments are converted to a common type”, this means
that the operator implementation for built-in types works as follows:
* If either argument is a complex number, the other is converted to
complex;
* otherwise, if either argument is a floating point number, the other
is converted to floating point;
* otherwise, both must be integers and no conversion is necessary.
Some additional rules apply for certain operators (e.g., a string as a
left argument to the ‘%’ operator). Extensions must define their own
conversion behavior.
uS5 Basic customization
*******************
object.__new__(cls[, ...])
Called to create a new instance of class *cls*. "__new__()" is a
static method (special-cased so you need not declare it as such)
that takes the class of which an instance was requested as its
first argument. The remaining arguments are those passed to the
object constructor expression (the call to the class). The return
value of "__new__()" should be the new object instance (usually an
instance of *cls*).
Typical implementations create a new instance of the class by
invoking the superclass’s "__new__()" method using
"super().__new__(cls[, ...])" with appropriate arguments and then
modifying the newly-created instance as necessary before returning
it.
If "__new__()" is invoked during object construction and it returns
an instance of *cls*, then the new instance’s "__init__()" method
will be invoked like "__init__(self[, ...])", where *self* is the
new instance and the remaining arguments are the same as were
passed to the object constructor.
If "__new__()" does not return an instance of *cls*, then the new
instance’s "__init__()" method will not be invoked.
"__new__()" is intended mainly to allow subclasses of immutable
types (like int, str, or tuple) to customize instance creation. It
is also commonly overridden in custom metaclasses in order to
customize class creation.
object.__init__(self[, ...])
Called after the instance has been created (by "__new__()"), but
before it is returned to the caller. The arguments are those
passed to the class constructor expression. If a base class has an
"__init__()" method, the derived class’s "__init__()" method, if
any, must explicitly call it to ensure proper initialization of the
base class part of the instance; for example:
"super().__init__([args...])".
Because "__new__()" and "__init__()" work together in constructing
objects ("__new__()" to create it, and "__init__()" to customize
it), no non-"None" value may be returned by "__init__()"; doing so
will cause a "TypeError" to be raised at runtime.
object.__del__(self)
Called when the instance is about to be destroyed. This is also
called a finalizer or (improperly) a destructor. If a base class
has a "__del__()" method, the derived class’s "__del__()" method,
if any, must explicitly call it to ensure proper deletion of the
base class part of the instance.
It is possible (though not recommended!) for the "__del__()" method
to postpone destruction of the instance by creating a new reference
to it. This is called object *resurrection*. It is
implementation-dependent whether "__del__()" is called a second
time when a resurrected object is about to be destroyed; the
current *CPython* implementation only calls it once.
It is not guaranteed that "__del__()" methods are called for
objects that still exist when the interpreter exits.
Note:
"del x" doesn’t directly call "x.__del__()" — the former
decrements the reference count for "x" by one, and the latter is
only called when "x"’s reference count reaches zero.
**CPython implementation detail:** It is possible for a reference
cycle to prevent the reference count of an object from going to
zero. In this case, the cycle will be later detected and deleted
by the *cyclic garbage collector*. A common cause of reference
cycles is when an exception has been caught in a local variable.
The frame’s locals then reference the exception, which references
its own traceback, which references the locals of all frames caught
in the traceback.
See also: Documentation for the "gc" module.
Warning:
Due to the precarious circumstances under which "__del__()"
methods are invoked, exceptions that occur during their execution
are ignored, and a warning is printed to "sys.stderr" instead.
In particular:
* "__del__()" can be invoked when arbitrary code is being
executed, including from any arbitrary thread. If "__del__()"
needs to take a lock or invoke any other blocking resource, it
may deadlock as the resource may already be taken by the code
that gets interrupted to execute "__del__()".
* "__del__()" can be executed during interpreter shutdown. As a
consequence, the global variables it needs to access (including
other modules) may already have been deleted or set to "None".
Python guarantees that globals whose name begins with a single
underscore are deleted from their module before other globals
are deleted; if no other references to such globals exist, this
may help in assuring that imported modules are still available
at the time when the "__del__()" method is called.
object.__repr__(self)
Called by the "repr()" built-in function to compute the “official”
string representation of an object. If at all possible, this
should look like a valid Python expression that could be used to
recreate an object with the same value (given an appropriate
environment). If this is not possible, a string of the form
"<...some useful description...>" should be returned. The return
value must be a string object. If a class defines "__repr__()" but
not "__str__()", then "__repr__()" is also used when an “informal”
string representation of instances of that class is required.
This is typically used for debugging, so it is important that the
representation is information-rich and unambiguous.
object.__str__(self)
Called by "str(object)" and the built-in functions "format()" and
"print()" to compute the “informal” or nicely printable string
representation of an object. The return value must be a string
object.
This method differs from "object.__repr__()" in that there is no
expectation that "__str__()" return a valid Python expression: a
more convenient or concise representation can be used.
The default implementation defined by the built-in type "object"
calls "object.__repr__()".
object.__bytes__(self)
Called by bytes to compute a byte-string representation of an
object. This should return a "bytes" object.
object.__format__(self, format_spec)
Called by the "format()" built-in function, and by extension,
evaluation of formatted string literals and the "str.format()"
method, to produce a “formatted” string representation of an
object. The *format_spec* argument is a string that contains a
description of the formatting options desired. The interpretation
of the *format_spec* argument is up to the type implementing
"__format__()", however most classes will either delegate
formatting to one of the built-in types, or use a similar
formatting option syntax.
See Format Specification Mini-Language for a description of the
standard formatting syntax.
The return value must be a string object.
Changed in version 3.4: The __format__ method of "object" itself
raises a "TypeError" if passed any non-empty string.
Changed in version 3.7: "object.__format__(x, '')" is now
equivalent to "str(x)" rather than "format(str(self), '')".
object.__lt__(self, other)
object.__le__(self, other)
object.__eq__(self, other)
object.__ne__(self, other)
object.__gt__(self, other)
object.__ge__(self, other)
These are the so-called “rich comparison” methods. The
correspondence between operator symbols and method names is as
follows: "x<y" calls "x.__lt__(y)", "x<=y" calls "x.__le__(y)",
"x==y" calls "x.__eq__(y)", "x!=y" calls "x.__ne__(y)", "x>y" calls
"x.__gt__(y)", and "x>=y" calls "x.__ge__(y)".
A rich comparison method may return the singleton "NotImplemented"
if it does not implement the operation for a given pair of
arguments. By convention, "False" and "True" are returned for a
successful comparison. However, these methods can return any value,
so if the comparison operator is used in a Boolean context (e.g.,
in the condition of an "if" statement), Python will call "bool()"
on the value to determine if the result is true or false.
By default, "object" implements "__eq__()" by using "is", returning
"NotImplemented" in the case of a false comparison: "True if x is y
else NotImplemented". For "__ne__()", by default it delegates to
"__eq__()" and inverts the result unless it is "NotImplemented".
There are no other implied relationships among the comparison
operators or default implementations; for example, the truth of
"(x<y or x==y)" does not imply "x<=y". To automatically generate
ordering operations from a single root operation, see
"functools.total_ordering()".
See the paragraph on "__hash__()" for some important notes on
creating *hashable* objects which support custom comparison
operations and are usable as dictionary keys.
There are no swapped-argument versions of these methods (to be used
when the left argument does not support the operation but the right
argument does); rather, "__lt__()" and "__gt__()" are each other’s
reflection, "__le__()" and "__ge__()" are each other’s reflection,
and "__eq__()" and "__ne__()" are their own reflection. If the
operands are of different types, and right operand’s type is a
direct or indirect subclass of the left operand’s type, the
reflected method of the right operand has priority, otherwise the
left operand’s method has priority. Virtual subclassing is not
considered.
object.__hash__(self)
Called by built-in function "hash()" and for operations on members
of hashed collections including "set", "frozenset", and "dict".
"__hash__()" should return an integer. The only required property
is that objects which compare equal have the same hash value; it is
advised to mix together the hash values of the components of the
object that also play a part in comparison of objects by packing
them into a tuple and hashing the tuple. Example:
def __hash__(self):
return hash((self.name, self.nick, self.color))
Note:
"hash()" truncates the value returned from an object’s custom
"__hash__()" method to the size of a "Py_ssize_t". This is
typically 8 bytes on 64-bit builds and 4 bytes on 32-bit builds.
If an object’s "__hash__()" must interoperate on builds of
different bit sizes, be sure to check the width on all supported
builds. An easy way to do this is with "python -c "import sys;
print(sys.hash_info.width)"".
If a class does not define an "__eq__()" method it should not
define a "__hash__()" operation either; if it defines "__eq__()"
but not "__hash__()", its instances will not be usable as items in
hashable collections. If a class defines mutable objects and
implements an "__eq__()" method, it should not implement
"__hash__()", since the implementation of hashable collections
requires that a key’s hash value is immutable (if the object’s hash
value changes, it will be in the wrong hash bucket).
User-defined classes have "__eq__()" and "__hash__()" methods by
default; with them, all objects compare unequal (except with
themselves) and "x.__hash__()" returns an appropriate value such
that "x == y" implies both that "x is y" and "hash(x) == hash(y)".
A class that overrides "__eq__()" and does not define "__hash__()"
will have its "__hash__()" implicitly set to "None". When the
"__hash__()" method of a class is "None", instances of the class
will raise an appropriate "TypeError" when a program attempts to
retrieve their hash value, and will also be correctly identified as
unhashable when checking "isinstance(obj,
collections.abc.Hashable)".
If a class that overrides "__eq__()" needs to retain the
implementation of "__hash__()" from a parent class, the interpreter
must be told this explicitly by setting "__hash__ =
<ParentClass>.__hash__".
If a class that does not override "__eq__()" wishes to suppress
hash support, it should include "__hash__ = None" in the class
definition. A class which defines its own "__hash__()" that
explicitly raises a "TypeError" would be incorrectly identified as
hashable by an "isinstance(obj, collections.abc.Hashable)" call.
Note:
By default, the "__hash__()" values of str and bytes objects are
“salted” with an unpredictable random value. Although they
remain constant within an individual Python process, they are not
predictable between repeated invocations of Python.This is
intended to provide protection against a denial-of-service caused
by carefully-chosen inputs that exploit the worst case
performance of a dict insertion, O(n^2) complexity. See
http://www.ocert.org/advisories/ocert-2011-003.html for
details.Changing hash values affects the iteration order of sets.
Python has never made guarantees about this ordering (and it
typically varies between 32-bit and 64-bit builds).See also
"PYTHONHASHSEED".
Changed in version 3.3: Hash randomization is enabled by default.
object.__bool__(self)
Called to implement truth value testing and the built-in operation
"bool()"; should return "False" or "True". When this method is not
defined, "__len__()" is called, if it is defined, and the object is
considered true if its result is nonzero. If a class defines
neither "__len__()" nor "__bool__()", all its instances are
considered true.
u�I "pdb" — The Python Debugger
***************************
**Source code:** Lib/pdb.py
======================================================================
The module "pdb" defines an interactive source code debugger for
Python programs. It supports setting (conditional) breakpoints and
single stepping at the source line level, inspection of stack frames,
source code listing, and evaluation of arbitrary Python code in the
context of any stack frame. It also supports post-mortem debugging
and can be called under program control.
The debugger is extensible – it is actually defined as the class
"Pdb". This is currently undocumented but easily understood by reading
the source. The extension interface uses the modules "bdb" and "cmd".
The debugger’s prompt is "(Pdb)". Typical usage to run a program under
control of the debugger is:
>>> import pdb
>>> import mymodule
>>> pdb.run('mymodule.test()')
> <string>(0)?()
(Pdb) continue
> <string>(1)?()
(Pdb) continue
NameError: 'spam'
> <string>(1)?()
(Pdb)
Changed in version 3.3: Tab-completion via the "readline" module is
available for commands and command arguments, e.g. the current global
and local names are offered as arguments of the "p" command.
"pdb.py" can also be invoked as a script to debug other scripts. For
example:
python3 -m pdb myscript.py
When invoked as a script, pdb will automatically enter post-mortem
debugging if the program being debugged exits abnormally. After post-
mortem debugging (or after normal exit of the program), pdb will
restart the program. Automatic restarting preserves pdb’s state (such
as breakpoints) and in most cases is more useful than quitting the
debugger upon program’s exit.
New in version 3.2: "pdb.py" now accepts a "-c" option that executes
commands as if given in a ".pdbrc" file, see Debugger Commands.
New in version 3.7: "pdb.py" now accepts a "-m" option that execute
modules similar to the way "python3 -m" does. As with a script, the
debugger will pause execution just before the first line of the
module.
The typical usage to break into the debugger from a running program is
to insert
import pdb; pdb.set_trace()
at the location you want to break into the debugger. You can then
step through the code following this statement, and continue running
without the debugger using the "continue" command.
New in version 3.7: The built-in "breakpoint()", when called with
defaults, can be used instead of "import pdb; pdb.set_trace()".
The typical usage to inspect a crashed program is:
>>> import pdb
>>> import mymodule
>>> mymodule.test()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "./mymodule.py", line 4, in test
test2()
File "./mymodule.py", line 3, in test2
print(spam)
NameError: spam
>>> pdb.pm()
> ./mymodule.py(3)test2()
-> print(spam)
(Pdb)
The module defines the following functions; each enters the debugger
in a slightly different way:
pdb.run(statement, globals=None, locals=None)
Execute the *statement* (given as a string or a code object) under
debugger control. The debugger prompt appears before any code is
executed; you can set breakpoints and type "continue", or you can
step through the statement using "step" or "next" (all these
commands are explained below). The optional *globals* and *locals*
arguments specify the environment in which the code is executed; by
default the dictionary of the module "__main__" is used. (See the
explanation of the built-in "exec()" or "eval()" functions.)
pdb.runeval(expression, globals=None, locals=None)
Evaluate the *expression* (given as a string or a code object)
under debugger control. When "runeval()" returns, it returns the
value of the expression. Otherwise this function is similar to
"run()".
pdb.runcall(function, *args, **kwds)
Call the *function* (a function or method object, not a string)
with the given arguments. When "runcall()" returns, it returns
whatever the function call returned. The debugger prompt appears
as soon as the function is entered.
pdb.set_trace(*, header=None)
Enter the debugger at the calling stack frame. This is useful to
hard-code a breakpoint at a given point in a program, even if the
code is not otherwise being debugged (e.g. when an assertion
fails). If given, *header* is printed to the console just before
debugging begins.
Changed in version 3.7: The keyword-only argument *header*.
pdb.post_mortem(traceback=None)
Enter post-mortem debugging of the given *traceback* object. If no
*traceback* is given, it uses the one of the exception that is
currently being handled (an exception must be being handled if the
default is to be used).
pdb.pm()
Enter post-mortem debugging of the traceback found in
"sys.last_traceback".
The "run*" functions and "set_trace()" are aliases for instantiating
the "Pdb" class and calling the method of the same name. If you want
to access further features, you have to do this yourself:
class pdb.Pdb(completekey='tab', stdin=None, stdout=None, skip=None, nosigint=False, readrc=True)
"Pdb" is the debugger class.
The *completekey*, *stdin* and *stdout* arguments are passed to the
underlying "cmd.Cmd" class; see the description there.
The *skip* argument, if given, must be an iterable of glob-style
module name patterns. The debugger will not step into frames that
originate in a module that matches one of these patterns. [1]
By default, Pdb sets a handler for the SIGINT signal (which is sent
when the user presses "Ctrl-C" on the console) when you give a
"continue" command. This allows you to break into the debugger
again by pressing "Ctrl-C". If you want Pdb not to touch the
SIGINT handler, set *nosigint* to true.
The *readrc* argument defaults to true and controls whether Pdb
will load .pdbrc files from the filesystem.
Example call to enable tracing with *skip*:
import pdb; pdb.Pdb(skip=['django.*']).set_trace()
Raises an auditing event "pdb.Pdb" with no arguments.
New in version 3.1: The *skip* argument.
New in version 3.2: The *nosigint* argument. Previously, a SIGINT
handler was never set by Pdb.
Changed in version 3.6: The *readrc* argument.
run(statement, globals=None, locals=None)
runeval(expression, globals=None, locals=None)
runcall(function, *args, **kwds)
set_trace()
See the documentation for the functions explained above.
Debugger Commands
=================
The commands recognized by the debugger are listed below. Most
commands can be abbreviated to one or two letters as indicated; e.g.
"h(elp)" means that either "h" or "help" can be used to enter the help
command (but not "he" or "hel", nor "H" or "Help" or "HELP").
Arguments to commands must be separated by whitespace (spaces or
tabs). Optional arguments are enclosed in square brackets ("[]") in
the command syntax; the square brackets must not be typed.
Alternatives in the command syntax are separated by a vertical bar
("|").
Entering a blank line repeats the last command entered. Exception: if
the last command was a "list" command, the next 11 lines are listed.
Commands that the debugger doesn’t recognize are assumed to be Python
statements and are executed in the context of the program being
debugged. Python statements can also be prefixed with an exclamation
point ("!"). This is a powerful way to inspect the program being
debugged; it is even possible to change a variable or call a function.
When an exception occurs in such a statement, the exception name is
printed but the debugger’s state is not changed.
The debugger supports aliases. Aliases can have parameters which
allows one a certain level of adaptability to the context under
examination.
Multiple commands may be entered on a single line, separated by ";;".
(A single ";" is not used as it is the separator for multiple commands
in a line that is passed to the Python parser.) No intelligence is
applied to separating the commands; the input is split at the first
";;" pair, even if it is in the middle of a quoted string.
If a file ".pdbrc" exists in the user’s home directory or in the
current directory, it is read in and executed as if it had been typed
at the debugger prompt. This is particularly useful for aliases. If
both files exist, the one in the home directory is read first and
aliases defined there can be overridden by the local file.
Changed in version 3.2: ".pdbrc" can now contain commands that
continue debugging, such as "continue" or "next". Previously, these
commands had no effect.
h(elp) [command]
Without argument, print the list of available commands. With a
*command* as argument, print help about that command. "help pdb"
displays the full documentation (the docstring of the "pdb"
module). Since the *command* argument must be an identifier, "help
exec" must be entered to get help on the "!" command.
w(here)
Print a stack trace, with the most recent frame at the bottom. An
arrow indicates the current frame, which determines the context of
most commands.
d(own) [count]
Move the current frame *count* (default one) levels down in the
stack trace (to a newer frame).
u(p) [count]
Move the current frame *count* (default one) levels up in the stack
trace (to an older frame).
b(reak) [([filename:]lineno | function) [, condition]]
With a *lineno* argument, set a break there in the current file.
With a *function* argument, set a break at the first executable
statement within that function. The line number may be prefixed
with a filename and a colon, to specify a breakpoint in another
file (probably one that hasn’t been loaded yet). The file is
searched on "sys.path". Note that each breakpoint is assigned a
number to which all the other breakpoint commands refer.
If a second argument is present, it is an expression which must
evaluate to true before the breakpoint is honored.
Without argument, list all breaks, including for each breakpoint,
the number of times that breakpoint has been hit, the current
ignore count, and the associated condition if any.
tbreak [([filename:]lineno | function) [, condition]]
Temporary breakpoint, which is removed automatically when it is
first hit. The arguments are the same as for "break".
cl(ear) [filename:lineno | bpnumber [bpnumber ...]]
With a *filename:lineno* argument, clear all the breakpoints at
this line. With a space separated list of breakpoint numbers, clear
those breakpoints. Without argument, clear all breaks (but first
ask confirmation).
disable [bpnumber [bpnumber ...]]
Disable the breakpoints given as a space separated list of
breakpoint numbers. Disabling a breakpoint means it cannot cause
the program to stop execution, but unlike clearing a breakpoint, it
remains in the list of breakpoints and can be (re-)enabled.
enable [bpnumber [bpnumber ...]]
Enable the breakpoints specified.
ignore bpnumber [count]
Set the ignore count for the given breakpoint number. If count is
omitted, the ignore count is set to 0. A breakpoint becomes active
when the ignore count is zero. When non-zero, the count is
decremented each time the breakpoint is reached and the breakpoint
is not disabled and any associated condition evaluates to true.
condition bpnumber [condition]
Set a new *condition* for the breakpoint, an expression which must
evaluate to true before the breakpoint is honored. If *condition*
is absent, any existing condition is removed; i.e., the breakpoint
is made unconditional.
commands [bpnumber]
Specify a list of commands for breakpoint number *bpnumber*. The
commands themselves appear on the following lines. Type a line
containing just "end" to terminate the commands. An example:
(Pdb) commands 1
(com) p some_variable
(com) end
(Pdb)
To remove all commands from a breakpoint, type "commands" and
follow it immediately with "end"; that is, give no commands.
With no *bpnumber* argument, "commands" refers to the last
breakpoint set.
You can use breakpoint commands to start your program up again.
Simply use the "continue" command, or "step", or any other command
that resumes execution.
Specifying any command resuming execution (currently "continue",
"step", "next", "return", "jump", "quit" and their abbreviations)
terminates the command list (as if that command was immediately
followed by end). This is because any time you resume execution
(even with a simple next or step), you may encounter another
breakpoint—which could have its own command list, leading to
ambiguities about which list to execute.
If you use the ‘silent’ command in the command list, the usual
message about stopping at a breakpoint is not printed. This may be
desirable for breakpoints that are to print a specific message and
then continue. If none of the other commands print anything, you
see no sign that the breakpoint was reached.
s(tep)
Execute the current line, stop at the first possible occasion
(either in a function that is called or on the next line in the
current function).
n(ext)
Continue execution until the next line in the current function is
reached or it returns. (The difference between "next" and "step"
is that "step" stops inside a called function, while "next"
executes called functions at (nearly) full speed, only stopping at
the next line in the current function.)
unt(il) [lineno]
Without argument, continue execution until the line with a number
greater than the current one is reached.
With a line number, continue execution until a line with a number
greater or equal to that is reached. In both cases, also stop when
the current frame returns.
Changed in version 3.2: Allow giving an explicit line number.
r(eturn)
Continue execution until the current function returns.
c(ont(inue))
Continue execution, only stop when a breakpoint is encountered.
j(ump) lineno
Set the next line that will be executed. Only available in the
bottom-most frame. This lets you jump back and execute code again,
or jump forward to skip code that you don’t want to run.
It should be noted that not all jumps are allowed – for instance it
is not possible to jump into the middle of a "for" loop or out of a
"finally" clause.
l(ist) [first[, last]]
List source code for the current file. Without arguments, list 11
lines around the current line or continue the previous listing.
With "." as argument, list 11 lines around the current line. With
one argument, list 11 lines around at that line. With two
arguments, list the given range; if the second argument is less
than the first, it is interpreted as a count.
The current line in the current frame is indicated by "->". If an
exception is being debugged, the line where the exception was
originally raised or propagated is indicated by ">>", if it differs
from the current line.
New in version 3.2: The ">>" marker.
ll | longlist
List all source code for the current function or frame.
Interesting lines are marked as for "list".
New in version 3.2.
a(rgs)
Print the argument list of the current function.
p expression
Evaluate the *expression* in the current context and print its
value.
Note:
"print()" can also be used, but is not a debugger command — this
executes the Python "print()" function.
pp expression
Like the "p" command, except the value of the expression is pretty-
printed using the "pprint" module.
whatis expression
Print the type of the *expression*.
source expression
Try to get source code for the given object and display it.
New in version 3.2.
display [expression]
Display the value of the expression if it changed, each time
execution stops in the current frame.
Without expression, list all display expressions for the current
frame.
New in version 3.2.
undisplay [expression]
Do not display the expression any more in the current frame.
Without expression, clear all display expressions for the current
frame.
New in version 3.2.
interact
Start an interactive interpreter (using the "code" module) whose
global namespace contains all the (global and local) names found in
the current scope.
New in version 3.2.
alias [name [command]]
Create an alias called *name* that executes *command*. The command
must *not* be enclosed in quotes. Replaceable parameters can be
indicated by "%1", "%2", and so on, while "%*" is replaced by all
the parameters. If no command is given, the current alias for
*name* is shown. If no arguments are given, all aliases are listed.
Aliases may be nested and can contain anything that can be legally
typed at the pdb prompt. Note that internal pdb commands *can* be
overridden by aliases. Such a command is then hidden until the
alias is removed. Aliasing is recursively applied to the first
word of the command line; all other words in the line are left
alone.
As an example, here are two useful aliases (especially when placed
in the ".pdbrc" file):
# Print instance variables (usage "pi classInst")
alias pi for k in %1.__dict__.keys(): print("%1.",k,"=",%1.__dict__[k])
# Print instance variables in self
alias ps pi self
unalias name
Delete the specified alias.
! statement
Execute the (one-line) *statement* in the context of the current
stack frame. The exclamation point can be omitted unless the first
word of the statement resembles a debugger command. To set a
global variable, you can prefix the assignment command with a
"global" statement on the same line, e.g.:
(Pdb) global list_options; list_options = ['-l']
(Pdb)
run [args ...]
restart [args ...]
Restart the debugged Python program. If an argument is supplied,
it is split with "shlex" and the result is used as the new
"sys.argv". History, breakpoints, actions and debugger options are
preserved. "restart" is an alias for "run".
q(uit)
Quit from the debugger. The program being executed is aborted.
debug code
Enter a recursive debugger that steps through the code argument
(which is an arbitrary expression or statement to be executed in
the current environment).
retval
Print the return value for the last return of a function.
-[ Footnotes ]-
[1] Whether a frame is considered to originate in a certain module is
determined by the "__name__" in the frame globals.
a� The "del" statement
*******************
del_stmt ::= "del" target_list
Deletion is recursively defined very similar to the way assignment is
defined. Rather than spelling it out in full details, here are some
hints.
Deletion of a target list recursively deletes each target, from left
to right.
Deletion of a name removes the binding of that name from the local or
global namespace, depending on whether the name occurs in a "global"
statement in the same code block. If the name is unbound, a
"NameError" exception will be raised.
Deletion of attribute references, subscriptions and slicings is passed
to the primary object involved; deletion of a slicing is in general
equivalent to assignment of an empty slice of the right type (but even
this is determined by the sliced object).
Changed in version 3.2: Previously it was illegal to delete a name
from the local namespace if it occurs as a free variable in a nested
block.
u Dictionary displays
*******************
A dictionary display is a possibly empty series of key/datum pairs
enclosed in curly braces:
dict_display ::= "{" [key_datum_list | dict_comprehension] "}"
key_datum_list ::= key_datum ("," key_datum)* [","]
key_datum ::= expression ":" expression | "**" or_expr
dict_comprehension ::= expression ":" expression comp_for
A dictionary display yields a new dictionary object.
If a comma-separated sequence of key/datum pairs is given, they are
evaluated from left to right to define the entries of the dictionary:
each key object is used as a key into the dictionary to store the
corresponding datum. This means that you can specify the same key
multiple times in the key/datum list, and the final dictionary’s value
for that key will be the last one given.
A double asterisk "**" denotes *dictionary unpacking*. Its operand
must be a *mapping*. Each mapping item is added to the new
dictionary. Later values replace values already set by earlier
key/datum pairs and earlier dictionary unpackings.
New in version 3.5: Unpacking into dictionary displays, originally
proposed by **PEP 448**.
A dict comprehension, in contrast to list and set comprehensions,
needs two expressions separated with a colon followed by the usual
“for” and “if” clauses. When the comprehension is run, the resulting
key and value elements are inserted in the new dictionary in the order
they are produced.
Restrictions on the types of the key values are listed earlier in
section The standard type hierarchy. (To summarize, the key type
should be *hashable*, which excludes all mutable objects.) Clashes
between duplicate keys are not detected; the last datum (textually
rightmost in the display) stored for a given key value prevails.
Changed in version 3.8: Prior to Python 3.8, in dict comprehensions,
the evaluation order of key and value was not well-defined. In
CPython, the value was evaluated before the key. Starting with 3.8,
the key is evaluated before the value, as proposed by **PEP 572**.
a� Interaction with dynamic features
*********************************
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
aX The "if" statement
******************
The "if" statement is used for conditional execution:
if_stmt ::= "if" assignment_expression ":" suite
("elif" assignment_expression ":" suite)*
["else" ":" suite]
It selects exactly one of the suites by evaluating the expressions one
by one until one is found to be true (see section Boolean operations
for the definition of true and false); then that suite is executed
(and no other part of the "if" statement is executed or evaluated).
If all expressions are false, the suite of the "else" clause, if
present, is executed.
u� Exceptions
**********
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is *raised* at the point where the error is
detected; it may be *handled* by the surrounding code block or by any
code block that directly or indirectly invoked the code block where
the error occurred.
The Python interpreter raises an exception when it detects a run-time
error (such as division by zero). A Python program can also
explicitly raise an exception with the "raise" statement. Exception
handlers are specified with the "try" … "except" statement. The
"finally" clause of such a statement can be used to specify cleanup
code which does not handle the exception, but is executed whether an
exception occurred or not in the preceding code.
Python uses the “termination” model of error handling: an exception
handler can find out what happened and continue execution at an outer
level, but it cannot repair the cause of the error and retry the
failing operation (except by re-entering the offending piece of code
from the top).
When an exception is not handled at all, the interpreter terminates
execution of the program, or returns to its interactive main loop. In
either case, it prints a stack traceback, except when the exception is
"SystemExit".
Exceptions are identified by class instances. The "except" clause is
selected depending on the class of the instance: it must reference the
class of the instance or a base class thereof. The instance can be
received by the handler and can carry additional information about the
exceptional condition.
Note:
Exception messages are not part of the Python API. Their contents
may change from one version of Python to the next without warning
and should not be relied on by code which will run under multiple
versions of the interpreter.
See also the description of the "try" statement in section The try
statement and "raise" statement in section The raise statement.
-[ Footnotes ]-
[1] This limitation occurs because the code that is executed by these
operations is not available at the time the module is compiled.
u$ Execution model
***************
Structure of a program
======================
A Python program is constructed from code blocks. A *block* is a piece
of Python program text that is executed as a unit. The following are
blocks: a module, a function body, and a class definition. Each
command typed interactively is a block. A script file (a file given
as standard input to the interpreter or specified as a command line
argument to the interpreter) is a code block. A script command (a
command specified on the interpreter command line with the "-c"
option) is a code block. The string argument passed to the built-in
functions "eval()" and "exec()" is a code block.
A code block is executed in an *execution frame*. A frame contains
some administrative information (used for debugging) and determines
where and how execution continues after the code block’s execution has
completed.
Naming and binding
==================
Binding of names
----------------
*Names* refer to objects. Names are introduced by name binding
operations.
The following constructs bind names: formal parameters to functions,
"import" statements, class and function definitions (these bind the
class or function name in the defining block), and targets that are
identifiers if occurring in an assignment, "for" loop header, or after
"as" in a "with" statement or "except" clause. The "import" statement
of the form "from ... import *" binds all names defined in the
imported module, except those beginning with an underscore. This form
may only be used at the module level.
A target occurring in a "del" statement is also considered bound for
this purpose (though the actual semantics are to unbind the name).
Each assignment or import statement occurs within a block defined by a
class or function definition or at the module level (the top-level
code block).
If a name is bound in a block, it is a local variable of that block,
unless declared as "nonlocal" or "global". If a name is bound at the
module level, it is a global variable. (The variables of the module
code block are local and global.) If a variable is used in a code
block but not defined there, it is a *free variable*.
Each occurrence of a name in the program text refers to the *binding*
of that name established by the following name resolution rules.
Resolution of names
-------------------
A *scope* defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. If the
definition occurs in a function block, the scope extends to any blocks
contained within the defining one, unless a contained block introduces
a different binding for the name.
When a name is used in a code block, it is resolved using the nearest
enclosing scope. The set of all such scopes visible to a code block
is called the block’s *environment*.
When a name is not found at all, a "NameError" exception is raised. If
the current scope is a function scope, and the name refers to a local
variable that has not yet been bound to a value at the point where the
name is used, an "UnboundLocalError" exception is raised.
"UnboundLocalError" is a subclass of "NameError".
If a name binding operation occurs anywhere within a code block, all
uses of the name within the block are treated as references to the
current block. This can lead to errors when a name is used within a
block before it is bound. This rule is subtle. Python lacks
declarations and allows name binding operations to occur anywhere
within a code block. The local variables of a code block can be
determined by scanning the entire text of the block for name binding
operations.
If the "global" statement occurs within a block, all uses of the name
specified in the statement refer to the binding of that name in the
top-level namespace. Names are resolved in the top-level namespace by
searching the global namespace, i.e. the namespace of the module
containing the code block, and the builtins namespace, the namespace
of the module "builtins". The global namespace is searched first. If
the name is not found there, the builtins namespace is searched. The
"global" statement must precede all uses of the name.
The "global" statement has the same scope as a name binding operation
in the same block. If the nearest enclosing scope for a free variable
contains a global statement, the free variable is treated as a global.
The "nonlocal" statement causes corresponding names to refer to
previously bound variables in the nearest enclosing function scope.
"SyntaxError" is raised at compile time if the given name does not
exist in any enclosing function scope.
The namespace for a module is automatically created the first time a
module is imported. The main module for a script is always called
"__main__".
Class definition blocks and arguments to "exec()" and "eval()" are
special in the context of name resolution. A class definition is an
executable statement that may use and define names. These references
follow the normal rules for name resolution with an exception that
unbound local variables are looked up in the global namespace. The
namespace of the class definition becomes the attribute dictionary of
the class. The scope of names defined in a class block is limited to
the class block; it does not extend to the code blocks of methods –
this includes comprehensions and generator expressions since they are
implemented using a function scope. This means that the following
will fail:
class A:
a = 42
b = list(a + i for i in range(10))
Builtins and restricted execution
---------------------------------
**CPython implementation detail:** Users should not touch
"__builtins__"; it is strictly an implementation detail. Users
wanting to override values in the builtins namespace should "import"
the "builtins" module and modify its attributes appropriately.
The builtins namespace associated with the execution of a code block
is actually found by looking up the name "__builtins__" in its global
namespace; this should be a dictionary or a module (in the latter case
the module’s dictionary is used). By default, when in the "__main__"
module, "__builtins__" is the built-in module "builtins"; when in any
other module, "__builtins__" is an alias for the dictionary of the
"builtins" module itself.
Interaction with dynamic features
---------------------------------
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
Exceptions
==========
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is *raised* at the point where the error is
detected; it may be *handled* by the surrounding code block or by any
code block that directly or indirectly invoked the code block where
the error occurred.
The Python interpreter raises an exception when it detects a run-time
error (such as division by zero). A Python program can also
explicitly raise an exception with the "raise" statement. Exception
handlers are specified with the "try" … "except" statement. The
"finally" clause of such a statement can be used to specify cleanup
code which does not handle the exception, but is executed whether an
exception occurred or not in the preceding code.
Python uses the “termination” model of error handling: an exception
handler can find out what happened and continue execution at an outer
level, but it cannot repair the cause of the error and retry the
failing operation (except by re-entering the offending piece of code
from the top).
When an exception is not handled at all, the interpreter terminates
execution of the program, or returns to its interactive main loop. In
either case, it prints a stack traceback, except when the exception is
"SystemExit".
Exceptions are identified by class instances. The "except" clause is
selected depending on the class of the instance: it must reference the
class of the instance or a base class thereof. The instance can be
received by the handler and can carry additional information about the
exceptional condition.
Note:
Exception messages are not part of the Python API. Their contents
may change from one version of Python to the next without warning
and should not be relied on by code which will run under multiple
versions of the interpreter.
See also the description of the "try" statement in section The try
statement and "raise" statement in section The raise statement.
-[ Footnotes ]-
[1] This limitation occurs because the code that is executed by these
operations is not available at the time the module is compiled.
uz Expression lists
****************
expression_list ::= expression ("," expression)* [","]
starred_list ::= starred_item ("," starred_item)* [","]
starred_expression ::= expression | (starred_item ",")* [starred_item]
starred_item ::= assignment_expression | "*" or_expr
Except when part of a list or set display, an expression list
containing at least one comma yields a tuple. The length of the tuple
is the number of expressions in the list. The expressions are
evaluated from left to right.
An asterisk "*" denotes *iterable unpacking*. Its operand must be an
*iterable*. The iterable is expanded into a sequence of items, which
are included in the new tuple, list, or set, at the site of the
unpacking.
New in version 3.5: Iterable unpacking in expression lists, originally
proposed by **PEP 448**.
The trailing comma is required only to create a single tuple (a.k.a. a
*singleton*); it is optional in all other cases. A single expression
without a trailing comma doesn’t create a tuple, but rather yields the
value of that expression. (To create an empty tuple, use an empty pair
of parentheses: "()".)
a� Floating point literals
***********************
Floating point literals are described by the following lexical
definitions:
floatnumber ::= pointfloat | exponentfloat
pointfloat ::= [digitpart] fraction | digitpart "."
exponentfloat ::= (digitpart | pointfloat) exponent
digitpart ::= digit (["_"] digit)*
fraction ::= "." digitpart
exponent ::= ("e" | "E") ["+" | "-"] digitpart
Note that the integer and exponent parts are always interpreted using
radix 10. For example, "077e010" is legal, and denotes the same number
as "77e10". The allowed range of floating point literals is
implementation-dependent. As in integer literals, underscores are
supported for digit grouping.
Some examples of floating point literals:
3.14 10. .001 1e100 3.14e-10 0e0 3.14_15_93
Changed in version 3.6: Underscores are now allowed for grouping
purposes in literals.
u�
The "for" statement
*******************
The "for" statement is used to iterate over the elements of a sequence
(such as a string, tuple or list) or other iterable object:
for_stmt ::= "for" target_list "in" expression_list ":" suite
["else" ":" suite]
The expression list is evaluated once; it should yield an iterable
object. An iterator is created for the result of the
"expression_list". The suite is then executed once for each item
provided by the iterator, in the order returned by the iterator. Each
item in turn is assigned to the target list using the standard rules
for assignments (see Assignment statements), and then the suite is
executed. When the items are exhausted (which is immediately when the
sequence is empty or an iterator raises a "StopIteration" exception),
the suite in the "else" clause, if present, is executed, and the loop
terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and continues
with the next item, or with the "else" clause if there is no next
item.
The for-loop makes assignments to the variables in the target list.
This overwrites all previous assignments to those variables including
those made in the suite of the for-loop:
for i in range(10):
print(i)
i = 5 # this will not affect the for-loop
# because i will be overwritten with the next
# index in the range
Names in the target list are not deleted when the loop is finished,
but if the sequence is empty, they will not have been assigned to at
all by the loop. Hint: the built-in function "range()" returns an
iterator of integers suitable to emulate the effect of Pascal’s "for i
:= a to b do"; e.g., "list(range(3))" returns the list "[0, 1, 2]".
Note:
There is a subtlety when the sequence is being modified by the loop
(this can only occur for mutable sequences, e.g. lists). An
internal counter is used to keep track of which item is used next,
and this is incremented on each iteration. When this counter has
reached the length of the sequence the loop terminates. This means
that if the suite deletes the current (or a previous) item from the
sequence, the next item will be skipped (since it gets the index of
the current item which has already been treated). Likewise, if the
suite inserts an item in the sequence before the current item, the
current item will be treated again the next time through the loop.
This can lead to nasty bugs that can be avoided by making a
temporary copy using a slice of the whole sequence, e.g.,
for x in a[:]:
if x < 0: a.remove(x)
u�` Format String Syntax
********************
The "str.format()" method and the "Formatter" class share the same
syntax for format strings (although in the case of "Formatter",
subclasses can define their own format string syntax). The syntax is
related to that of formatted string literals, but it is less
sophisticated and, in particular, does not support arbitrary
expressions.
Format strings contain “replacement fields” surrounded by curly braces
"{}". Anything that is not contained in braces is considered literal
text, which is copied unchanged to the output. If you need to include
a brace character in the literal text, it can be escaped by doubling:
"{{" and "}}".
The grammar for a replacement field is as follows:
replacement_field ::= "{" [field_name] ["!" conversion] [":" format_spec] "}"
field_name ::= arg_name ("." attribute_name | "[" element_index "]")*
arg_name ::= [identifier | digit+]
attribute_name ::= identifier
element_index ::= digit+ | index_string
index_string ::= <any source character except "]"> +
conversion ::= "r" | "s" | "a"
format_spec ::= <described in the next section>
In less formal terms, the replacement field can start with a
*field_name* that specifies the object whose value is to be formatted
and inserted into the output instead of the replacement field. The
*field_name* is optionally followed by a *conversion* field, which is
preceded by an exclamation point "'!'", and a *format_spec*, which is
preceded by a colon "':'". These specify a non-default format for the
replacement value.
See also the Format Specification Mini-Language section.
The *field_name* itself begins with an *arg_name* that is either a
number or a keyword. If it’s a number, it refers to a positional
argument, and if it’s a keyword, it refers to a named keyword
argument. If the numerical arg_names in a format string are 0, 1, 2,
… in sequence, they can all be omitted (not just some) and the numbers
0, 1, 2, … will be automatically inserted in that order. Because
*arg_name* is not quote-delimited, it is not possible to specify
arbitrary dictionary keys (e.g., the strings "'10'" or "':-]'") within
a format string. The *arg_name* can be followed by any number of index
or attribute expressions. An expression of the form "'.name'" selects
the named attribute using "getattr()", while an expression of the form
"'[index]'" does an index lookup using "__getitem__()".
Changed in version 3.1: The positional argument specifiers can be
omitted for "str.format()", so "'{} {}'.format(a, b)" is equivalent to
"'{0} {1}'.format(a, b)".
Changed in version 3.4: The positional argument specifiers can be
omitted for "Formatter".
Some simple format string examples:
"First, thou shalt count to {0}" # References first positional argument
"Bring me a {}" # Implicitly references the first positional argument
"From {} to {}" # Same as "From {0} to {1}"
"My quest is {name}" # References keyword argument 'name'
"Weight in tons {0.weight}" # 'weight' attribute of first positional arg
"Units destroyed: {players[0]}" # First element of keyword argument 'players'.
The *conversion* field causes a type coercion before formatting.
Normally, the job of formatting a value is done by the "__format__()"
method of the value itself. However, in some cases it is desirable to
force a type to be formatted as a string, overriding its own
definition of formatting. By converting the value to a string before
calling "__format__()", the normal formatting logic is bypassed.
Three conversion flags are currently supported: "'!s'" which calls
"str()" on the value, "'!r'" which calls "repr()" and "'!a'" which
calls "ascii()".
Some examples:
"Harold's a clever {0!s}" # Calls str() on the argument first
"Bring out the holy {name!r}" # Calls repr() on the argument first
"More {!a}" # Calls ascii() on the argument first
The *format_spec* field contains a specification of how the value
should be presented, including such details as field width, alignment,
padding, decimal precision and so on. Each value type can define its
own “formatting mini-language” or interpretation of the *format_spec*.
Most built-in types support a common formatting mini-language, which
is described in the next section.
A *format_spec* field can also include nested replacement fields
within it. These nested replacement fields may contain a field name,
conversion flag and format specification, but deeper nesting is not
allowed. The replacement fields within the format_spec are
substituted before the *format_spec* string is interpreted. This
allows the formatting of a value to be dynamically specified.
See the Format examples section for some examples.
Format Specification Mini-Language
==================================
“Format specifications” are used within replacement fields contained
within a format string to define how individual values are presented
(see Format String Syntax and Formatted string literals). They can
also be passed directly to the built-in "format()" function. Each
formattable type may define how the format specification is to be
interpreted.
Most built-in types implement the following options for format
specifications, although some of the formatting options are only
supported by the numeric types.
A general convention is that an empty format specification produces
the same result as if you had called "str()" on the value. A non-empty
format specification typically modifies the result.
The general form of a *standard format specifier* is:
format_spec ::= [[fill]align][sign][#][0][width][grouping_option][.precision][type]
fill ::= <any character>
align ::= "<" | ">" | "=" | "^"
sign ::= "+" | "-" | " "
width ::= digit+
grouping_option ::= "_" | ","
precision ::= digit+
type ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%"
If a valid *align* value is specified, it can be preceded by a *fill*
character that can be any character and defaults to a space if
omitted. It is not possible to use a literal curly brace (”"{"” or
“"}"”) as the *fill* character in a formatted string literal or when
using the "str.format()" method. However, it is possible to insert a
curly brace with a nested replacement field. This limitation doesn’t
affect the "format()" function.
The meaning of the various alignment options is as follows:
+-----------+------------------------------------------------------------+
| Option | Meaning |
|===========|============================================================|
| "'<'" | Forces the field to be left-aligned within the available |
| | space (this is the default for most objects). |
+-----------+------------------------------------------------------------+
| "'>'" | Forces the field to be right-aligned within the available |
| | space (this is the default for numbers). |
+-----------+------------------------------------------------------------+
| "'='" | Forces the padding to be placed after the sign (if any) |
| | but before the digits. This is used for printing fields |
| | in the form ‘+000000120’. This alignment option is only |
| | valid for numeric types. It becomes the default when ‘0’ |
| | immediately precedes the field width. |
+-----------+------------------------------------------------------------+
| "'^'" | Forces the field to be centered within the available |
| | space. |
+-----------+------------------------------------------------------------+
Note that unless a minimum field width is defined, the field width
will always be the same size as the data to fill it, so that the
alignment option has no meaning in this case.
The *sign* option is only valid for number types, and can be one of
the following:
+-----------+------------------------------------------------------------+
| Option | Meaning |
|===========|============================================================|
| "'+'" | indicates that a sign should be used for both positive as |
| | well as negative numbers. |
+-----------+------------------------------------------------------------+
| "'-'" | indicates that a sign should be used only for negative |
| | numbers (this is the default behavior). |
+-----------+------------------------------------------------------------+
| space | indicates that a leading space should be used on positive |
| | numbers, and a minus sign on negative numbers. |
+-----------+------------------------------------------------------------+
The "'#'" option causes the “alternate form” to be used for the
conversion. The alternate form is defined differently for different
types. This option is only valid for integer, float and complex
types. For integers, when binary, octal, or hexadecimal output is
used, this option adds the prefix respective "'0b'", "'0o'", or "'0x'"
to the output value. For float and complex the alternate form causes
the result of the conversion to always contain a decimal-point
character, even if no digits follow it. Normally, a decimal-point
character appears in the result of these conversions only if a digit
follows it. In addition, for "'g'" and "'G'" conversions, trailing
zeros are not removed from the result.
The "','" option signals the use of a comma for a thousands separator.
For a locale aware separator, use the "'n'" integer presentation type
instead.
Changed in version 3.1: Added the "','" option (see also **PEP 378**).
The "'_'" option signals the use of an underscore for a thousands
separator for floating point presentation types and for integer
presentation type "'d'". For integer presentation types "'b'", "'o'",
"'x'", and "'X'", underscores will be inserted every 4 digits. For
other presentation types, specifying this option is an error.
Changed in version 3.6: Added the "'_'" option (see also **PEP 515**).
*width* is a decimal integer defining the minimum total field width,
including any prefixes, separators, and other formatting characters.
If not specified, then the field width will be determined by the
content.
When no explicit alignment is given, preceding the *width* field by a
zero ("'0'") character enables sign-aware zero-padding for numeric
types. This is equivalent to a *fill* character of "'0'" with an
*alignment* type of "'='".
The *precision* is a decimal number indicating how many digits should
be displayed after the decimal point for a floating point value
formatted with "'f'" and "'F'", or before and after the decimal point
for a floating point value formatted with "'g'" or "'G'". For non-
number types the field indicates the maximum field size - in other
words, how many characters will be used from the field content. The
*precision* is not allowed for integer values.
Finally, the *type* determines how the data should be presented.
The available string presentation types are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'s'" | String format. This is the default type for strings and |
| | may be omitted. |
+-----------+------------------------------------------------------------+
| None | The same as "'s'". |
+-----------+------------------------------------------------------------+
The available integer presentation types are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'b'" | Binary format. Outputs the number in base 2. |
+-----------+------------------------------------------------------------+
| "'c'" | Character. Converts the integer to the corresponding |
| | unicode character before printing. |
+-----------+------------------------------------------------------------+
| "'d'" | Decimal Integer. Outputs the number in base 10. |
+-----------+------------------------------------------------------------+
| "'o'" | Octal format. Outputs the number in base 8. |
+-----------+------------------------------------------------------------+
| "'x'" | Hex format. Outputs the number in base 16, using lower- |
| | case letters for the digits above 9. |
+-----------+------------------------------------------------------------+
| "'X'" | Hex format. Outputs the number in base 16, using upper- |
| | case letters for the digits above 9. |
+-----------+------------------------------------------------------------+
| "'n'" | Number. This is the same as "'d'", except that it uses the |
| | current locale setting to insert the appropriate number |
| | separator characters. |
+-----------+------------------------------------------------------------+
| None | The same as "'d'". |
+-----------+------------------------------------------------------------+
In addition to the above presentation types, integers can be formatted
with the floating point presentation types listed below (except "'n'"
and "None"). When doing so, "float()" is used to convert the integer
to a floating point number before formatting.
The available presentation types for "float" and "Decimal" values are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'e'" | Scientific notation. For a given precision "p", formats |
| | the number in scientific notation with the letter ‘e’ |
| | separating the coefficient from the exponent. The |
| | coefficient has one digit before and "p" digits after the |
| | decimal point, for a total of "p + 1" significant digits. |
| | With no precision given, uses a precision of "6" digits |
| | after the decimal point for "float", and shows all |
| | coefficient digits for "Decimal". If no digits follow the |
| | decimal point, the decimal point is also removed unless |
| | the "#" option is used. |
+-----------+------------------------------------------------------------+
| "'E'" | Scientific notation. Same as "'e'" except it uses an upper |
| | case ‘E’ as the separator character. |
+-----------+------------------------------------------------------------+
| "'f'" | Fixed-point notation. For a given precision "p", formats |
| | the number as a decimal number with exactly "p" digits |
| | following the decimal point. With no precision given, uses |
| | a precision of "6" digits after the decimal point for |
| | "float", and uses a precision large enough to show all |
| | coefficient digits for "Decimal". If no digits follow the |
| | decimal point, the decimal point is also removed unless |
| | the "#" option is used. |
+-----------+------------------------------------------------------------+
| "'F'" | Fixed-point notation. Same as "'f'", but converts "nan" to |
| | "NAN" and "inf" to "INF". |
+-----------+------------------------------------------------------------+
| "'g'" | General format. For a given precision "p >= 1", this |
| | rounds the number to "p" significant digits and then |
| | formats the result in either fixed-point format or in |
| | scientific notation, depending on its magnitude. A |
| | precision of "0" is treated as equivalent to a precision |
| | of "1". The precise rules are as follows: suppose that |
| | the result formatted with presentation type "'e'" and |
| | precision "p-1" would have exponent "exp". Then, if "m <= |
| | exp < p", where "m" is -4 for floats and -6 for |
| | "Decimals", the number is formatted with presentation type |
| | "'f'" and precision "p-1-exp". Otherwise, the number is |
| | formatted with presentation type "'e'" and precision |
| | "p-1". In both cases insignificant trailing zeros are |
| | removed from the significand, and the decimal point is |
| | also removed if there are no remaining digits following |
| | it, unless the "'#'" option is used. With no precision |
| | given, uses a precision of "6" significant digits for |
| | "float". For "Decimal", the coefficient of the result is |
| | formed from the coefficient digits of the value; |
| | scientific notation is used for values smaller than "1e-6" |
| | in absolute value and values where the place value of the |
| | least significant digit is larger than 1, and fixed-point |
| | notation is used otherwise. Positive and negative |
| | infinity, positive and negative zero, and nans, are |
| | formatted as "inf", "-inf", "0", "-0" and "nan" |
| | respectively, regardless of the precision. |
+-----------+------------------------------------------------------------+
| "'G'" | General format. Same as "'g'" except switches to "'E'" if |
| | the number gets too large. The representations of infinity |
| | and NaN are uppercased, too. |
+-----------+------------------------------------------------------------+
| "'n'" | Number. This is the same as "'g'", except that it uses the |
| | current locale setting to insert the appropriate number |
| | separator characters. |
+-----------+------------------------------------------------------------+
| "'%'" | Percentage. Multiplies the number by 100 and displays in |
| | fixed ("'f'") format, followed by a percent sign. |
+-----------+------------------------------------------------------------+
| None | For "float" this is the same as "'g'", except that when |
| | fixed-point notation is used to format the result, it |
| | always includes at least one digit past the decimal point. |
| | The precision used is as large as needed to represent the |
| | given value faithfully. For "Decimal", this is the same |
| | as either "'g'" or "'G'" depending on the value of |
| | "context.capitals" for the current decimal context. The |
| | overall effect is to match the output of "str()" as |
| | altered by the other format modifiers. |
+-----------+------------------------------------------------------------+
Format examples
===============
This section contains examples of the "str.format()" syntax and
comparison with the old "%"-formatting.
In most of the cases the syntax is similar to the old "%"-formatting,
with the addition of the "{}" and with ":" used instead of "%". For
example, "'%03.2f'" can be translated to "'{:03.2f}'".
The new format syntax also supports new and different options, shown
in the following examples.
Accessing arguments by position:
>>> '{0}, {1}, {2}'.format('a', 'b', 'c')
'a, b, c'
>>> '{}, {}, {}'.format('a', 'b', 'c') # 3.1+ only
'a, b, c'
>>> '{2}, {1}, {0}'.format('a', 'b', 'c')
'c, b, a'
>>> '{2}, {1}, {0}'.format(*'abc') # unpacking argument sequence
'c, b, a'
>>> '{0}{1}{0}'.format('abra', 'cad') # arguments' indices can be repeated
'abracadabra'
Accessing arguments by name:
>>> 'Coordinates: {latitude}, {longitude}'.format(latitude='37.24N', longitude='-115.81W')
'Coordinates: 37.24N, -115.81W'
>>> coord = {'latitude': '37.24N', 'longitude': '-115.81W'}
>>> 'Coordinates: {latitude}, {longitude}'.format(**coord)
'Coordinates: 37.24N, -115.81W'
Accessing arguments’ attributes:
>>> c = 3-5j
>>> ('The complex number {0} is formed from the real part {0.real} '
... 'and the imaginary part {0.imag}.').format(c)
'The complex number (3-5j) is formed from the real part 3.0 and the imaginary part -5.0.'
>>> class Point:
... def __init__(self, x, y):
... self.x, self.y = x, y
... def __str__(self):
... return 'Point({self.x}, {self.y})'.format(self=self)
...
>>> str(Point(4, 2))
'Point(4, 2)'
Accessing arguments’ items:
>>> coord = (3, 5)
>>> 'X: {0[0]}; Y: {0[1]}'.format(coord)
'X: 3; Y: 5'
Replacing "%s" and "%r":
>>> "repr() shows quotes: {!r}; str() doesn't: {!s}".format('test1', 'test2')
"repr() shows quotes: 'test1'; str() doesn't: test2"
Aligning the text and specifying a width:
>>> '{:<30}'.format('left aligned')
'left aligned '
>>> '{:>30}'.format('right aligned')
' right aligned'
>>> '{:^30}'.format('centered')
' centered '
>>> '{:*^30}'.format('centered') # use '*' as a fill char
'***********centered***********'
Replacing "%+f", "%-f", and "% f" and specifying a sign:
>>> '{:+f}; {:+f}'.format(3.14, -3.14) # show it always
'+3.140000; -3.140000'
>>> '{: f}; {: f}'.format(3.14, -3.14) # show a space for positive numbers
' 3.140000; -3.140000'
>>> '{:-f}; {:-f}'.format(3.14, -3.14) # show only the minus -- same as '{:f}; {:f}'
'3.140000; -3.140000'
Replacing "%x" and "%o" and converting the value to different bases:
>>> # format also supports binary numbers
>>> "int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}".format(42)
'int: 42; hex: 2a; oct: 52; bin: 101010'
>>> # with 0x, 0o, or 0b as prefix:
>>> "int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}".format(42)
'int: 42; hex: 0x2a; oct: 0o52; bin: 0b101010'
Using the comma as a thousands separator:
>>> '{:,}'.format(1234567890)
'1,234,567,890'
Expressing a percentage:
>>> points = 19
>>> total = 22
>>> 'Correct answers: {:.2%}'.format(points/total)
'Correct answers: 86.36%'
Using type-specific formatting:
>>> import datetime
>>> d = datetime.datetime(2010, 7, 4, 12, 15, 58)
>>> '{:%Y-%m-%d %H:%M:%S}'.format(d)
'2010-07-04 12:15:58'
Nesting arguments and more complex examples:
>>> for align, text in zip('<^>', ['left', 'center', 'right']):
... '{0:{fill}{align}16}'.format(text, fill=align, align=align)
...
'left<<<<<<<<<<<<'
'^^^^^center^^^^^'
'>>>>>>>>>>>right'
>>>
>>> octets = [192, 168, 0, 1]
>>> '{:02X}{:02X}{:02X}{:02X}'.format(*octets)
'C0A80001'
>>> int(_, 16)
3232235521
>>>
>>> width = 5
>>> for num in range(5,12):
... for base in 'dXob':
... print('{0:{width}{base}}'.format(num, base=base, width=width), end=' ')
... print()
...
5 5 5 101
6 6 6 110
7 7 7 111
8 8 10 1000
9 9 11 1001
10 A 12 1010
11 B 13 1011
u| Function definitions
********************
A function definition defines a user-defined function object (see
section The standard type hierarchy):
funcdef ::= [decorators] "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
decorators ::= decorator+
decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name ::= identifier ("." identifier)*
parameter_list ::= defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]]
| parameter_list_no_posonly
parameter_list_no_posonly ::= defparameter ("," defparameter)* ["," [parameter_list_starargs]]
| parameter_list_starargs
parameter_list_starargs ::= "*" [parameter] ("," defparameter)* ["," ["**" parameter [","]]]
| "**" parameter [","]
parameter ::= identifier [":" expression]
defparameter ::= parameter ["=" expression]
funcname ::= identifier
A function definition is an executable statement. Its execution binds
the function name in the current local namespace to a function object
(a wrapper around the executable code for the function). This
function object contains a reference to the current global namespace
as the global namespace to be used when the function is called.
The function definition does not execute the function body; this gets
executed only when the function is called. [2]
A function definition may be wrapped by one or more *decorator*
expressions. Decorator expressions are evaluated when the function is
defined, in the scope that contains the function definition. The
result must be a callable, which is invoked with the function object
as the only argument. The returned value is bound to the function name
instead of the function object. Multiple decorators are applied in
nested fashion. For example, the following code
@f1(arg)
@f2
def func(): pass
is roughly equivalent to
def func(): pass
func = f1(arg)(f2(func))
except that the original function is not temporarily bound to the name
"func".
When one or more *parameters* have the form *parameter* "="
*expression*, the function is said to have “default parameter values.”
For a parameter with a default value, the corresponding *argument* may
be omitted from a call, in which case the parameter’s default value is
substituted. If a parameter has a default value, all following
parameters up until the “"*"” must also have a default value — this is
a syntactic restriction that is not expressed by the grammar.
**Default parameter values are evaluated from left to right when the
function definition is executed.** This means that the expression is
evaluated once, when the function is defined, and that the same “pre-
computed” value is used for each call. This is especially important
to understand when a default parameter is a mutable object, such as a
list or a dictionary: if the function modifies the object (e.g. by
appending an item to a list), the default value is in effect modified.
This is generally not what was intended. A way around this is to use
"None" as the default, and explicitly test for it in the body of the
function, e.g.:
def whats_on_the_telly(penguin=None):
if penguin is None:
penguin = []
penguin.append("property of the zoo")
return penguin
Function call semantics are described in more detail in section Calls.
A function call always assigns values to all parameters mentioned in
the parameter list, either from positional arguments, from keyword
arguments, or from default values. If the form “"*identifier"” is
present, it is initialized to a tuple receiving any excess positional
parameters, defaulting to the empty tuple. If the form
“"**identifier"” is present, it is initialized to a new ordered
mapping receiving any excess keyword arguments, defaulting to a new
empty mapping of the same type. Parameters after “"*"” or
“"*identifier"” are keyword-only parameters and may only be passed by
keyword arguments. Parameters before “"/"” are positional-only
parameters and may only be passed by positional arguments.
Changed in version 3.8: The "/" function parameter syntax may be used
to indicate positional-only parameters. See **PEP 570** for details.
Parameters may have an *annotation* of the form “": expression"”
following the parameter name. Any parameter may have an annotation,
even those of the form "*identifier" or "**identifier". Functions may
have “return” annotation of the form “"-> expression"” after the
parameter list. These annotations can be any valid Python expression.
The presence of annotations does not change the semantics of a
function. The annotation values are available as values of a
dictionary keyed by the parameters’ names in the "__annotations__"
attribute of the function object. If the "annotations" import from
"__future__" is used, annotations are preserved as strings at runtime
which enables postponed evaluation. Otherwise, they are evaluated
when the function definition is executed. In this case annotations
may be evaluated in a different order than they appear in the source
code.
It is also possible to create anonymous functions (functions not bound
to a name), for immediate use in expressions. This uses lambda
expressions, described in section Lambdas. Note that the lambda
expression is merely a shorthand for a simplified function definition;
a function defined in a “"def"” statement can be passed around or
assigned to another name just like a function defined by a lambda
expression. The “"def"” form is actually more powerful since it
allows the execution of multiple statements and annotations.
**Programmer’s note:** Functions are first-class objects. A “"def"”
statement executed inside a function definition defines a local
function that can be returned or passed around. Free variables used
in the nested function can access the local variables of the function
containing the def. See section Naming and binding for details.
See also:
**PEP 3107** - Function Annotations
The original specification for function annotations.
**PEP 484** - Type Hints
Definition of a standard meaning for annotations: type hints.
**PEP 526** - Syntax for Variable Annotations
Ability to type hint variable declarations, including class
variables and instance variables
**PEP 563** - Postponed Evaluation of Annotations
Support for forward references within annotations by preserving
annotations in a string form at runtime instead of eager
evaluation.
u� The "global" statement
**********************
global_stmt ::= "global" identifier ("," identifier)*
The "global" statement is a declaration which holds for the entire
current code block. It means that the listed identifiers are to be
interpreted as globals. It would be impossible to assign to a global
variable without "global", although free variables may refer to
globals without being declared global.
Names listed in a "global" statement must not be used in the same code
block textually preceding that "global" statement.
Names listed in a "global" statement must not be defined as formal
parameters or in a "for" loop control target, "class" definition,
function definition, "import" statement, or variable annotation.
**CPython implementation detail:** The current implementation does not
enforce some of these restrictions, but programs should not abuse this
freedom, as future implementations may enforce them or silently change
the meaning of the program.
**Programmer’s note:** "global" is a directive to the parser. It
applies only to code parsed at the same time as the "global"
statement. In particular, a "global" statement contained in a string
or code object supplied to the built-in "exec()" function does not
affect the code block *containing* the function call, and code
contained in such a string is unaffected by "global" statements in the
code containing the function call. The same applies to the "eval()"
and "compile()" functions.
u� Reserved classes of identifiers
*******************************
Certain classes of identifiers (besides keywords) have special
meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
"_*"
Not imported by "from module import *". The special identifier "_"
is used in the interactive interpreter to store the result of the
last evaluation; it is stored in the "builtins" module. When not
in interactive mode, "_" has no special meaning and is not defined.
See section The import statement.
Note:
The name "_" is often used in conjunction with
internationalization; refer to the documentation for the
"gettext" module for more information on this convention.
"__*__"
System-defined names, informally known as “dunder” names. These
names are defined by the interpreter and its implementation
(including the standard library). Current system names are
discussed in the Special method names section and elsewhere. More
will likely be defined in future versions of Python. *Any* use of
"__*__" names, in any context, that does not follow explicitly
documented use, is subject to breakage without warning.
"__*"
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled form
to help avoid name clashes between “private” attributes of base and
derived classes. See section Identifiers (Names).
um Identifiers and keywords
************************
Identifiers (also referred to as *names*) are described by the
following lexical definitions.
The syntax of identifiers in Python is based on the Unicode standard
annex UAX-31, with elaboration and changes as defined below; see also
**PEP 3131** for further details.
Within the ASCII range (U+0001..U+007F), the valid characters for
identifiers are the same as in Python 2.x: the uppercase and lowercase
letters "A" through "Z", the underscore "_" and, except for the first
character, the digits "0" through "9".
Python 3.0 introduces additional characters from outside the ASCII
range (see **PEP 3131**). For these characters, the classification
uses the version of the Unicode Character Database as included in the
"unicodedata" module.
Identifiers are unlimited in length. Case is significant.
identifier ::= xid_start xid_continue*
id_start ::= <all characters in general categories Lu, Ll, Lt, Lm, Lo, Nl, the underscore, and characters with the Other_ID_Start property>
id_continue ::= <all characters in id_start, plus characters in the categories Mn, Mc, Nd, Pc and others with the Other_ID_Continue property>
xid_start ::= <all characters in id_start whose NFKC normalization is in "id_start xid_continue*">
xid_continue ::= <all characters in id_continue whose NFKC normalization is in "id_continue*">
The Unicode category codes mentioned above stand for:
* *Lu* - uppercase letters
* *Ll* - lowercase letters
* *Lt* - titlecase letters
* *Lm* - modifier letters
* *Lo* - other letters
* *Nl* - letter numbers
* *Mn* - nonspacing marks
* *Mc* - spacing combining marks
* *Nd* - decimal numbers
* *Pc* - connector punctuations
* *Other_ID_Start* - explicit list of characters in PropList.txt to
support backwards compatibility
* *Other_ID_Continue* - likewise
All identifiers are converted into the normal form NFKC while parsing;
comparison of identifiers is based on NFKC.
A non-normative HTML file listing all valid identifier characters for
Unicode 4.1 can be found at
https://www.unicode.org/Public/13.0.0/ucd/DerivedCoreProperties.txt
Keywords
========
The following identifiers are used as reserved words, or *keywords* of
the language, and cannot be used as ordinary identifiers. They must
be spelled exactly as written here:
False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield
Reserved classes of identifiers
===============================
Certain classes of identifiers (besides keywords) have special
meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
"_*"
Not imported by "from module import *". The special identifier "_"
is used in the interactive interpreter to store the result of the
last evaluation; it is stored in the "builtins" module. When not
in interactive mode, "_" has no special meaning and is not defined.
See section The import statement.
Note:
The name "_" is often used in conjunction with
internationalization; refer to the documentation for the
"gettext" module for more information on this convention.
"__*__"
System-defined names, informally known as “dunder” names. These
names are defined by the interpreter and its implementation
(including the standard library). Current system names are
discussed in the Special method names section and elsewhere. More
will likely be defined in future versions of Python. *Any* use of
"__*__" names, in any context, that does not follow explicitly
documented use, is subject to breakage without warning.
"__*"
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled form
to help avoid name clashes between “private” attributes of base and
derived classes. See section Identifiers (Names).
a5 Imaginary literals
******************
Imaginary literals are described by the following lexical definitions:
imagnumber ::= (floatnumber | digitpart) ("j" | "J")
An imaginary literal yields a complex number with a real part of 0.0.
Complex numbers are represented as a pair of floating point numbers
and have the same restrictions on their range. To create a complex
number with a nonzero real part, add a floating point number to it,
e.g., "(3+4j)". Some examples of imaginary literals:
3.14j 10.j 10j .001j 1e100j 3.14e-10j 3.14_15_93j
u8" The "import" statement
**********************
import_stmt ::= "import" module ["as" identifier] ("," module ["as" identifier])*
| "from" relative_module "import" identifier ["as" identifier]
("," identifier ["as" identifier])*
| "from" relative_module "import" "(" identifier ["as" identifier]
("," identifier ["as" identifier])* [","] ")"
| "from" module "import" "*"
module ::= (identifier ".")* identifier
relative_module ::= "."* module | "."+
The basic import statement (no "from" clause) is executed in two
steps:
1. find a module, loading and initializing it if necessary
2. define a name or names in the local namespace for the scope where
the "import" statement occurs.
When the statement contains multiple clauses (separated by commas) the
two steps are carried out separately for each clause, just as though
the clauses had been separated out into individual import statements.
The details of the first step, finding and loading modules are
described in greater detail in the section on the import system, which
also describes the various types of packages and modules that can be
imported, as well as all the hooks that can be used to customize the
import system. Note that failures in this step may indicate either
that the module could not be located, *or* that an error occurred
while initializing the module, which includes execution of the
module’s code.
If the requested module is retrieved successfully, it will be made
available in the local namespace in one of three ways:
* If the module name is followed by "as", then the name following "as"
is bound directly to the imported module.
* If no other name is specified, and the module being imported is a
top level module, the module’s name is bound in the local namespace
as a reference to the imported module
* If the module being imported is *not* a top level module, then the
name of the top level package that contains the module is bound in
the local namespace as a reference to the top level package. The
imported module must be accessed using its full qualified name
rather than directly
The "from" form uses a slightly more complex process:
1. find the module specified in the "from" clause, loading and
initializing it if necessary;
2. for each of the identifiers specified in the "import" clauses:
1. check if the imported module has an attribute by that name
2. if not, attempt to import a submodule with that name and then
check the imported module again for that attribute
3. if the attribute is not found, "ImportError" is raised.
4. otherwise, a reference to that value is stored in the local
namespace, using the name in the "as" clause if it is present,
otherwise using the attribute name
Examples:
import foo # foo imported and bound locally
import foo.bar.baz # foo.bar.baz imported, foo bound locally
import foo.bar.baz as fbb # foo.bar.baz imported and bound as fbb
from foo.bar import baz # foo.bar.baz imported and bound as baz
from foo import attr # foo imported and foo.attr bound as attr
If the list of identifiers is replaced by a star ("'*'"), all public
names defined in the module are bound in the local namespace for the
scope where the "import" statement occurs.
The *public names* defined by a module are determined by checking the
module’s namespace for a variable named "__all__"; if defined, it must
be a sequence of strings which are names defined or imported by that
module. The names given in "__all__" are all considered public and
are required to exist. If "__all__" is not defined, the set of public
names includes all names found in the module’s namespace which do not
begin with an underscore character ("'_'"). "__all__" should contain
the entire public API. It is intended to avoid accidentally exporting
items that are not part of the API (such as library modules which were
imported and used within the module).
The wild card form of import — "from module import *" — is only
allowed at the module level. Attempting to use it in class or
function definitions will raise a "SyntaxError".
When specifying what module to import you do not have to specify the
absolute name of the module. When a module or package is contained
within another package it is possible to make a relative import within
the same top package without having to mention the package name. By
using leading dots in the specified module or package after "from" you
can specify how high to traverse up the current package hierarchy
without specifying exact names. One leading dot means the current
package where the module making the import exists. Two dots means up
one package level. Three dots is up two levels, etc. So if you execute
"from . import mod" from a module in the "pkg" package then you will
end up importing "pkg.mod". If you execute "from ..subpkg2 import mod"
from within "pkg.subpkg1" you will import "pkg.subpkg2.mod". The
specification for relative imports is contained in the Package
Relative Imports section.
"importlib.import_module()" is provided to support applications that
determine dynamically the modules to be loaded.
Raises an auditing event "import" with arguments "module", "filename",
"sys.path", "sys.meta_path", "sys.path_hooks".
Future statements
=================
A *future statement* is a directive to the compiler that a particular
module should be compiled using syntax or semantics that will be
available in a specified future release of Python where the feature
becomes standard.
The future statement is intended to ease migration to future versions
of Python that introduce incompatible changes to the language. It
allows use of the new features on a per-module basis before the
release in which the feature becomes standard.
future_stmt ::= "from" "__future__" "import" feature ["as" identifier]
("," feature ["as" identifier])*
| "from" "__future__" "import" "(" feature ["as" identifier]
("," feature ["as" identifier])* [","] ")"
feature ::= identifier
A future statement must appear near the top of the module. The only
lines that can appear before a future statement are:
* the module docstring (if any),
* comments,
* blank lines, and
* other future statements.
The only feature that requires using the future statement is
"annotations" (see **PEP 563**).
All historical features enabled by the future statement are still
recognized by Python 3. The list includes "absolute_import",
"division", "generators", "generator_stop", "unicode_literals",
"print_function", "nested_scopes" and "with_statement". They are all
redundant because they are always enabled, and only kept for backwards
compatibility.
A future statement is recognized and treated specially at compile
time: Changes to the semantics of core constructs are often
implemented by generating different code. It may even be the case
that a new feature introduces new incompatible syntax (such as a new
reserved word), in which case the compiler may need to parse the
module differently. Such decisions cannot be pushed off until
runtime.
For any given release, the compiler knows which feature names have
been defined, and raises a compile-time error if a future statement
contains a feature not known to it.
The direct runtime semantics are the same as for any import statement:
there is a standard module "__future__", described later, and it will
be imported in the usual way at the time the future statement is
executed.
The interesting runtime semantics depend on the specific feature
enabled by the future statement.
Note that there is nothing special about the statement:
import __future__ [as name]
That is not a future statement; it’s an ordinary import statement with
no special semantics or syntax restrictions.
Code compiled by calls to the built-in functions "exec()" and
"compile()" that occur in a module "M" containing a future statement
will, by default, use the new syntax or semantics associated with the
future statement. This can be controlled by optional arguments to
"compile()" — see the documentation of that function for details.
A future statement typed at an interactive interpreter prompt will
take effect for the rest of the interpreter session. If an
interpreter is started with the "-i" option, is passed a script name
to execute, and the script includes a future statement, it will be in
effect in the interactive session started after the script is
executed.
See also:
**PEP 236** - Back to the __future__
The original proposal for the __future__ mechanism.
a Membership test operations
**************************
The operators "in" and "not in" test for membership. "x in s"
evaluates to "True" if *x* is a member of *s*, and "False" otherwise.
"x not in s" returns the negation of "x in s". All built-in sequences
and set types support this as well as dictionary, for which "in" tests
whether the dictionary has a given key. For container types such as
list, tuple, set, frozenset, dict, or collections.deque, the
expression "x in y" is equivalent to "any(x is e or x == e for e in
y)".
For the string and bytes types, "x in y" is "True" if and only if *x*
is a substring of *y*. An equivalent test is "y.find(x) != -1".
Empty strings are always considered to be a substring of any other
string, so """ in "abc"" will return "True".
For user-defined classes which define the "__contains__()" method, "x
in y" returns "True" if "y.__contains__(x)" returns a true value, and
"False" otherwise.
For user-defined classes which do not define "__contains__()" but do
define "__iter__()", "x in y" is "True" if some value "z", for which
the expression "x is z or x == z" is true, is produced while iterating
over "y". If an exception is raised during the iteration, it is as if
"in" raised that exception.
Lastly, the old-style iteration protocol is tried: if a class defines
"__getitem__()", "x in y" is "True" if and only if there is a non-
negative integer index *i* such that "x is y[i] or x == y[i]", and no
lower integer index raises the "IndexError" exception. (If any other
exception is raised, it is as if "in" raised that exception).
The operator "not in" is defined to have the inverse truth value of
"in".
aV Integer literals
****************
Integer literals are described by the following lexical definitions:
integer ::= decinteger | bininteger | octinteger | hexinteger
decinteger ::= nonzerodigit (["_"] digit)* | "0"+ (["_"] "0")*
bininteger ::= "0" ("b" | "B") (["_"] bindigit)+
octinteger ::= "0" ("o" | "O") (["_"] octdigit)+
hexinteger ::= "0" ("x" | "X") (["_"] hexdigit)+
nonzerodigit ::= "1"..."9"
digit ::= "0"..."9"
bindigit ::= "0" | "1"
octdigit ::= "0"..."7"
hexdigit ::= digit | "a"..."f" | "A"..."F"
There is no limit for the length of integer literals apart from what
can be stored in available memory.
Underscores are ignored for determining the numeric value of the
literal. They can be used to group digits for enhanced readability.
One underscore can occur between digits, and after base specifiers
like "0x".
Note that leading zeros in a non-zero decimal number are not allowed.
This is for disambiguation with C-style octal literals, which Python
used before version 3.0.
Some examples of integer literals:
7 2147483647 0o177 0b100110111
3 79228162514264337593543950336 0o377 0xdeadbeef
100_000_000_000 0b_1110_0101
Changed in version 3.6: Underscores are now allowed for grouping
purposes in literals.
a^ Lambdas
*******
lambda_expr ::= "lambda" [parameter_list] ":" expression
lambda_expr_nocond ::= "lambda" [parameter_list] ":" expression_nocond
Lambda expressions (sometimes called lambda forms) are used to create
anonymous functions. The expression "lambda parameters: expression"
yields a function object. The unnamed object behaves like a function
object defined with:
def <lambda>(parameters):
return expression
See section Function definitions for the syntax of parameter lists.
Note that functions created with lambda expressions cannot contain
statements or annotations.
a/ List displays
*************
A list display is a possibly empty series of expressions enclosed in
square brackets:
list_display ::= "[" [starred_list | comprehension] "]"
A list display yields a new list object, the contents being specified
by either a list of expressions or a comprehension. When a comma-
separated list of expressions is supplied, its elements are evaluated
from left to right and placed into the list object in that order.
When a comprehension is supplied, the list is constructed from the
elements resulting from the comprehension.
u� Naming and binding
******************
Binding of names
================
*Names* refer to objects. Names are introduced by name binding
operations.
The following constructs bind names: formal parameters to functions,
"import" statements, class and function definitions (these bind the
class or function name in the defining block), and targets that are
identifiers if occurring in an assignment, "for" loop header, or after
"as" in a "with" statement or "except" clause. The "import" statement
of the form "from ... import *" binds all names defined in the
imported module, except those beginning with an underscore. This form
may only be used at the module level.
A target occurring in a "del" statement is also considered bound for
this purpose (though the actual semantics are to unbind the name).
Each assignment or import statement occurs within a block defined by a
class or function definition or at the module level (the top-level
code block).
If a name is bound in a block, it is a local variable of that block,
unless declared as "nonlocal" or "global". If a name is bound at the
module level, it is a global variable. (The variables of the module
code block are local and global.) If a variable is used in a code
block but not defined there, it is a *free variable*.
Each occurrence of a name in the program text refers to the *binding*
of that name established by the following name resolution rules.
Resolution of names
===================
A *scope* defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. If the
definition occurs in a function block, the scope extends to any blocks
contained within the defining one, unless a contained block introduces
a different binding for the name.
When a name is used in a code block, it is resolved using the nearest
enclosing scope. The set of all such scopes visible to a code block
is called the block’s *environment*.
When a name is not found at all, a "NameError" exception is raised. If
the current scope is a function scope, and the name refers to a local
variable that has not yet been bound to a value at the point where the
name is used, an "UnboundLocalError" exception is raised.
"UnboundLocalError" is a subclass of "NameError".
If a name binding operation occurs anywhere within a code block, all
uses of the name within the block are treated as references to the
current block. This can lead to errors when a name is used within a
block before it is bound. This rule is subtle. Python lacks
declarations and allows name binding operations to occur anywhere
within a code block. The local variables of a code block can be
determined by scanning the entire text of the block for name binding
operations.
If the "global" statement occurs within a block, all uses of the name
specified in the statement refer to the binding of that name in the
top-level namespace. Names are resolved in the top-level namespace by
searching the global namespace, i.e. the namespace of the module
containing the code block, and the builtins namespace, the namespace
of the module "builtins". The global namespace is searched first. If
the name is not found there, the builtins namespace is searched. The
"global" statement must precede all uses of the name.
The "global" statement has the same scope as a name binding operation
in the same block. If the nearest enclosing scope for a free variable
contains a global statement, the free variable is treated as a global.
The "nonlocal" statement causes corresponding names to refer to
previously bound variables in the nearest enclosing function scope.
"SyntaxError" is raised at compile time if the given name does not
exist in any enclosing function scope.
The namespace for a module is automatically created the first time a
module is imported. The main module for a script is always called
"__main__".
Class definition blocks and arguments to "exec()" and "eval()" are
special in the context of name resolution. A class definition is an
executable statement that may use and define names. These references
follow the normal rules for name resolution with an exception that
unbound local variables are looked up in the global namespace. The
namespace of the class definition becomes the attribute dictionary of
the class. The scope of names defined in a class block is limited to
the class block; it does not extend to the code blocks of methods –
this includes comprehensions and generator expressions since they are
implemented using a function scope. This means that the following
will fail:
class A:
a = 42
b = list(a + i for i in range(10))
Builtins and restricted execution
=================================
**CPython implementation detail:** Users should not touch
"__builtins__"; it is strictly an implementation detail. Users
wanting to override values in the builtins namespace should "import"
the "builtins" module and modify its attributes appropriately.
The builtins namespace associated with the execution of a code block
is actually found by looking up the name "__builtins__" in its global
namespace; this should be a dictionary or a module (in the latter case
the module’s dictionary is used). By default, when in the "__main__"
module, "__builtins__" is the built-in module "builtins"; when in any
other module, "__builtins__" is an alias for the dictionary of the
"builtins" module itself.
Interaction with dynamic features
=================================
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
a� The "nonlocal" statement
************************
nonlocal_stmt ::= "nonlocal" identifier ("," identifier)*
The "nonlocal" statement causes the listed identifiers to refer to
previously bound variables in the nearest enclosing scope excluding
globals. This is important because the default behavior for binding is
to search the local namespace first. The statement allows
encapsulated code to rebind variables outside of the local scope
besides the global (module) scope.
Names listed in a "nonlocal" statement, unlike those listed in a
"global" statement, must refer to pre-existing bindings in an
enclosing scope (the scope in which a new binding should be created
cannot be determined unambiguously).
Names listed in a "nonlocal" statement must not collide with pre-
existing bindings in the local scope.
See also:
**PEP 3104** - Access to Names in Outer Scopes
The specification for the "nonlocal" statement.
u� Numeric literals
****************
There are three types of numeric literals: integers, floating point
numbers, and imaginary numbers. There are no complex literals
(complex numbers can be formed by adding a real number and an
imaginary number).
Note that numeric literals do not include a sign; a phrase like "-1"
is actually an expression composed of the unary operator ‘"-"’ and the
literal "1".
u Emulating numeric types
***********************
The following methods can be defined to emulate numeric objects.
Methods corresponding to operations that are not supported by the
particular kind of number implemented (e.g., bitwise operations for
non-integral numbers) should be left undefined.
object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__matmul__(self, other)
object.__truediv__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|"). For instance, to
evaluate the expression "x + y", where *x* is an instance of a
class that has an "__add__()" method, "x.__add__(y)" is called.
The "__divmod__()" method should be the equivalent to using
"__floordiv__()" and "__mod__()"; it should not be related to
"__truediv__()". Note that "__pow__()" should be defined to accept
an optional third argument if the ternary version of the built-in
"pow()" function is to be supported.
If one of those methods does not support the operation with the
supplied arguments, it should return "NotImplemented".
object.__radd__(self, other)
object.__rsub__(self, other)
object.__rmul__(self, other)
object.__rmatmul__(self, other)
object.__rtruediv__(self, other)
object.__rfloordiv__(self, other)
object.__rmod__(self, other)
object.__rdivmod__(self, other)
object.__rpow__(self, other[, modulo])
object.__rlshift__(self, other)
object.__rrshift__(self, other)
object.__rand__(self, other)
object.__rxor__(self, other)
object.__ror__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|") with reflected (swapped)
operands. These functions are only called if the left operand does
not support the corresponding operation [3] and the operands are of
different types. [4] For instance, to evaluate the expression "x -
y", where *y* is an instance of a class that has an "__rsub__()"
method, "y.__rsub__(x)" is called if "x.__sub__(y)" returns
*NotImplemented*.
Note that ternary "pow()" will not try calling "__rpow__()" (the
coercion rules would become too complicated).
Note:
If the right operand’s type is a subclass of the left operand’s
type and that subclass provides a different implementation of the
reflected method for the operation, this method will be called
before the left operand’s non-reflected method. This behavior
allows subclasses to override their ancestors’ operations.
object.__iadd__(self, other)
object.__isub__(self, other)
object.__imul__(self, other)
object.__imatmul__(self, other)
object.__itruediv__(self, other)
object.__ifloordiv__(self, other)
object.__imod__(self, other)
object.__ipow__(self, other[, modulo])
object.__ilshift__(self, other)
object.__irshift__(self, other)
object.__iand__(self, other)
object.__ixor__(self, other)
object.__ior__(self, other)
These methods are called to implement the augmented arithmetic
assignments ("+=", "-=", "*=", "@=", "/=", "//=", "%=", "**=",
"<<=", ">>=", "&=", "^=", "|="). These methods should attempt to
do the operation in-place (modifying *self*) and return the result
(which could be, but does not have to be, *self*). If a specific
method is not defined, the augmented assignment falls back to the
normal methods. For instance, if *x* is an instance of a class
with an "__iadd__()" method, "x += y" is equivalent to "x =
x.__iadd__(y)" . Otherwise, "x.__add__(y)" and "y.__radd__(x)" are
considered, as with the evaluation of "x + y". In certain
situations, augmented assignment can result in unexpected errors
(see Why does a_tuple[i] += [‘item’] raise an exception when the
addition works?), but this behavior is in fact part of the data
model.
Note:
Due to a bug in the dispatching mechanism for "**=", a class that
defines "__ipow__()" but returns "NotImplemented" would fail to
fall back to "x.__pow__(y)" and "y.__rpow__(x)". This bug is
fixed in Python 3.10.
object.__neg__(self)
object.__pos__(self)
object.__abs__(self)
object.__invert__(self)
Called to implement the unary arithmetic operations ("-", "+",
"abs()" and "~").
object.__complex__(self)
object.__int__(self)
object.__float__(self)
Called to implement the built-in functions "complex()", "int()" and
"float()". Should return a value of the appropriate type.
object.__index__(self)
Called to implement "operator.index()", and whenever Python needs
to losslessly convert the numeric object to an integer object (such
as in slicing, or in the built-in "bin()", "hex()" and "oct()"
functions). Presence of this method indicates that the numeric
object is an integer type. Must return an integer.
If "__int__()", "__float__()" and "__complex__()" are not defined
then corresponding built-in functions "int()", "float()" and
"complex()" fall back to "__index__()".
object.__round__(self[, ndigits])
object.__trunc__(self)
object.__floor__(self)
object.__ceil__(self)
Called to implement the built-in function "round()" and "math"
functions "trunc()", "floor()" and "ceil()". Unless *ndigits* is
passed to "__round__()" all these methods should return the value
of the object truncated to an "Integral" (typically an "int").
The built-in function "int()" falls back to "__trunc__()" if
neither "__int__()" nor "__index__()" is defined.
u Objects, values and types
*************************
*Objects* are Python’s abstraction for data. All data in a Python
program is represented by objects or by relations between objects. (In
a sense, and in conformance to Von Neumann’s model of a “stored
program computer”, code is also represented by objects.)
Every object has an identity, a type and a value. An object’s
*identity* never changes once it has been created; you may think of it
as the object’s address in memory. The ‘"is"’ operator compares the
identity of two objects; the "id()" function returns an integer
representing its identity.
**CPython implementation detail:** For CPython, "id(x)" is the memory
address where "x" is stored.
An object’s type determines the operations that the object supports
(e.g., “does it have a length?”) and also defines the possible values
for objects of that type. The "type()" function returns an object’s
type (which is an object itself). Like its identity, an object’s
*type* is also unchangeable. [1]
The *value* of some objects can change. Objects whose value can
change are said to be *mutable*; objects whose value is unchangeable
once they are created are called *immutable*. (The value of an
immutable container object that contains a reference to a mutable
object can change when the latter’s value is changed; however the
container is still considered immutable, because the collection of
objects it contains cannot be changed. So, immutability is not
strictly the same as having an unchangeable value, it is more subtle.)
An object’s mutability is determined by its type; for instance,
numbers, strings and tuples are immutable, while dictionaries and
lists are mutable.
Objects are never explicitly destroyed; however, when they become
unreachable they may be garbage-collected. An implementation is
allowed to postpone garbage collection or omit it altogether — it is a
matter of implementation quality how garbage collection is
implemented, as long as no objects are collected that are still
reachable.
**CPython implementation detail:** CPython currently uses a reference-
counting scheme with (optional) delayed detection of cyclically linked
garbage, which collects most objects as soon as they become
unreachable, but is not guaranteed to collect garbage containing
circular references. See the documentation of the "gc" module for
information on controlling the collection of cyclic garbage. Other
implementations act differently and CPython may change. Do not depend
on immediate finalization of objects when they become unreachable (so
you should always close files explicitly).
Note that the use of the implementation’s tracing or debugging
facilities may keep objects alive that would normally be collectable.
Also note that catching an exception with a ‘"try"…"except"’ statement
may keep objects alive.
Some objects contain references to “external” resources such as open
files or windows. It is understood that these resources are freed
when the object is garbage-collected, but since garbage collection is
not guaranteed to happen, such objects also provide an explicit way to
release the external resource, usually a "close()" method. Programs
are strongly recommended to explicitly close such objects. The
‘"try"…"finally"’ statement and the ‘"with"’ statement provide
convenient ways to do this.
Some objects contain references to other objects; these are called
*containers*. Examples of containers are tuples, lists and
dictionaries. The references are part of a container’s value. In
most cases, when we talk about the value of a container, we imply the
values, not the identities of the contained objects; however, when we
talk about the mutability of a container, only the identities of the
immediately contained objects are implied. So, if an immutable
container (like a tuple) contains a reference to a mutable object, its
value changes if that mutable object is changed.
Types affect almost all aspects of object behavior. Even the
importance of object identity is affected in some sense: for immutable
types, operations that compute new values may actually return a
reference to any existing object with the same type and value, while
for mutable objects this is not allowed. E.g., after "a = 1; b = 1",
"a" and "b" may or may not refer to the same object with the value
one, depending on the implementation, but after "c = []; d = []", "c"
and "d" are guaranteed to refer to two different, unique, newly
created empty lists. (Note that "c = d = []" assigns the same object
to both "c" and "d".)
u� Operator precedence
*******************
The following table summarizes the operator precedence in Python, from
lowest precedence (least binding) to highest precedence (most
binding). Operators in the same box have the same precedence. Unless
the syntax is explicitly given, operators are binary. Operators in
the same box group left to right (except for exponentiation, which
groups from right to left).
Note that comparisons, membership tests, and identity tests, all have
the same precedence and have a left-to-right chaining feature as
described in the Comparisons section.
+-------------------------------------------------+---------------------------------------+
| Operator | Description |
|=================================================|=======================================|
| ":=" | Assignment expression |
+-------------------------------------------------+---------------------------------------+
| "lambda" | Lambda expression |
+-------------------------------------------------+---------------------------------------+
| "if" – "else" | Conditional expression |
+-------------------------------------------------+---------------------------------------+
| "or" | Boolean OR |
+-------------------------------------------------+---------------------------------------+
| "and" | Boolean AND |
+-------------------------------------------------+---------------------------------------+
| "not" "x" | Boolean NOT |
+-------------------------------------------------+---------------------------------------+
| "in", "not in", "is", "is not", "<", "<=", ">", | Comparisons, including membership |
| ">=", "!=", "==" | tests and identity tests |
+-------------------------------------------------+---------------------------------------+
| "|" | Bitwise OR |
+-------------------------------------------------+---------------------------------------+
| "^" | Bitwise XOR |
+-------------------------------------------------+---------------------------------------+
| "&" | Bitwise AND |
+-------------------------------------------------+---------------------------------------+
| "<<", ">>" | Shifts |
+-------------------------------------------------+---------------------------------------+
| "+", "-" | Addition and subtraction |
+-------------------------------------------------+---------------------------------------+
| "*", "@", "/", "//", "%" | Multiplication, matrix |
| | multiplication, division, floor |
| | division, remainder [5] |
+-------------------------------------------------+---------------------------------------+
| "+x", "-x", "~x" | Positive, negative, bitwise NOT |
+-------------------------------------------------+---------------------------------------+
| "**" | Exponentiation [6] |
+-------------------------------------------------+---------------------------------------+
| "await" "x" | Await expression |
+-------------------------------------------------+---------------------------------------+
| "x[index]", "x[index:index]", | Subscription, slicing, call, |
| "x(arguments...)", "x.attribute" | attribute reference |
+-------------------------------------------------+---------------------------------------+
| "(expressions...)", "[expressions...]", "{key: | Binding or parenthesized expression, |
| value...}", "{expressions...}" | list display, dictionary display, set |
| | display |
+-------------------------------------------------+---------------------------------------+
-[ Footnotes ]-
[1] While "abs(x%y) < abs(y)" is true mathematically, for floats it
may not be true numerically due to roundoff. For example, and
assuming a platform on which a Python float is an IEEE 754 double-
precision number, in order that "-1e-100 % 1e100" have the same
sign as "1e100", the computed result is "-1e-100 + 1e100", which
is numerically exactly equal to "1e100". The function
"math.fmod()" returns a result whose sign matches the sign of the
first argument instead, and so returns "-1e-100" in this case.
Which approach is more appropriate depends on the application.
[2] If x is very close to an exact integer multiple of y, it’s
possible for "x//y" to be one larger than "(x-x%y)//y" due to
rounding. In such cases, Python returns the latter result, in
order to preserve that "divmod(x,y)[0] * y + x % y" be very close
to "x".
[3] The Unicode standard distinguishes between *code points* (e.g.
U+0041) and *abstract characters* (e.g. “LATIN CAPITAL LETTER A”).
While most abstract characters in Unicode are only represented
using one code point, there is a number of abstract characters
that can in addition be represented using a sequence of more than
one code point. For example, the abstract character “LATIN
CAPITAL LETTER C WITH CEDILLA” can be represented as a single
*precomposed character* at code position U+00C7, or as a sequence
of a *base character* at code position U+0043 (LATIN CAPITAL
LETTER C), followed by a *combining character* at code position
U+0327 (COMBINING CEDILLA).
The comparison operators on strings compare at the level of
Unicode code points. This may be counter-intuitive to humans. For
example, ""\u00C7" == "\u0043\u0327"" is "False", even though both
strings represent the same abstract character “LATIN CAPITAL
LETTER C WITH CEDILLA”.
To compare strings at the level of abstract characters (that is,
in a way intuitive to humans), use "unicodedata.normalize()".
[4] Due to automatic garbage-collection, free lists, and the dynamic
nature of descriptors, you may notice seemingly unusual behaviour
in certain uses of the "is" operator, like those involving
comparisons between instance methods, or constants. Check their
documentation for more info.
[5] The "%" operator is also used for string formatting; the same
precedence applies.
[6] The power operator "**" binds less tightly than an arithmetic or
bitwise unary operator on its right, that is, "2**-1" is "0.5".
uw The "pass" statement
********************
pass_stmt ::= "pass"
"pass" is a null operation — when it is executed, nothing happens. It
is useful as a placeholder when a statement is required syntactically,
but no code needs to be executed, for example:
def f(arg): pass # a function that does nothing (yet)
class C: pass # a class with no methods (yet)
a� The power operator
******************
The power operator binds more tightly than unary operators on its
left; it binds less tightly than unary operators on its right. The
syntax is:
power ::= (await_expr | primary) ["**" u_expr]
Thus, in an unparenthesized sequence of power and unary operators, the
operators are evaluated from right to left (this does not constrain
the evaluation order for the operands): "-1**2" results in "-1".
The power operator has the same semantics as the built-in "pow()"
function, when called with two arguments: it yields its left argument
raised to the power of its right argument. The numeric arguments are
first converted to a common type, and the result is of that type.
For int operands, the result has the same type as the operands unless
the second argument is negative; in that case, all arguments are
converted to float and a float result is delivered. For example,
"10**2" returns "100", but "10**-2" returns "0.01".
Raising "0.0" to a negative power results in a "ZeroDivisionError".
Raising a negative number to a fractional power results in a "complex"
number. (In earlier versions it raised a "ValueError".)
uJ
The "raise" statement
*********************
raise_stmt ::= "raise" [expression ["from" expression]]
If no expressions are present, "raise" re-raises the last exception
that was active in the current scope. If no exception is active in
the current scope, a "RuntimeError" exception is raised indicating
that this is an error.
Otherwise, "raise" evaluates the first expression as the exception
object. It must be either a subclass or an instance of
"BaseException". If it is a class, the exception instance will be
obtained when needed by instantiating the class with no arguments.
The *type* of the exception is the exception instance’s class, the
*value* is the instance itself.
A traceback object is normally created automatically when an exception
is raised and attached to it as the "__traceback__" attribute, which
is writable. You can create an exception and set your own traceback in
one step using the "with_traceback()" exception method (which returns
the same exception instance, with its traceback set to its argument),
like so:
raise Exception("foo occurred").with_traceback(tracebackobj)
The "from" clause is used for exception chaining: if given, the second
*expression* must be another exception class or instance. If the
second expression is an exception instance, it will be attached to the
raised exception as the "__cause__" attribute (which is writable). If
the expression is an exception class, the class will be instantiated
and the resulting exception instance will be attached to the raised
exception as the "__cause__" attribute. If the raised exception is not
handled, both exceptions will be printed:
>>> try:
... print(1 / 0)
... except Exception as exc:
... raise RuntimeError("Something bad happened") from exc
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
A similar mechanism works implicitly if an exception is raised inside
an exception handler or a "finally" clause: the previous exception is
then attached as the new exception’s "__context__" attribute:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something bad happened")
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
Exception chaining can be explicitly suppressed by specifying "None"
in the "from" clause:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something bad happened") from None
...
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
Additional information on exceptions can be found in section
Exceptions, and information about handling exceptions is in section
The try statement.
Changed in version 3.3: "None" is now permitted as "Y" in "raise X
from Y".
New in version 3.3: The "__suppress_context__" attribute to suppress
automatic display of the exception context.
a The "return" statement
**********************
return_stmt ::= "return" [expression_list]
"return" may only occur syntactically nested in a function definition,
not within a nested class definition.
If an expression list is present, it is evaluated, else "None" is
substituted.
"return" leaves the current function call with the expression list (or
"None") as return value.
When "return" passes control out of a "try" statement with a "finally"
clause, that "finally" clause is executed before really leaving the
function.
In a generator function, the "return" statement indicates that the
generator is done and will cause "StopIteration" to be raised. The
returned value (if any) is used as an argument to construct
"StopIteration" and becomes the "StopIteration.value" attribute.
In an asynchronous generator function, an empty "return" statement
indicates that the asynchronous generator is done and will cause
"StopAsyncIteration" to be raised. A non-empty "return" statement is
a syntax error in an asynchronous generator function.
u� Emulating container types
*************************
The following methods can be defined to implement container objects.
Containers usually are sequences (such as lists or tuples) or mappings
(like dictionaries), but can represent other containers as well. The
first set of methods is used either to emulate a sequence or to
emulate a mapping; the difference is that for a sequence, the
allowable keys should be the integers *k* for which "0 <= k < N" where
*N* is the length of the sequence, or slice objects, which define a
range of items. It is also recommended that mappings provide the
methods "keys()", "values()", "items()", "get()", "clear()",
"setdefault()", "pop()", "popitem()", "copy()", and "update()"
behaving similar to those for Python’s standard dictionary objects.
The "collections.abc" module provides a "MutableMapping" abstract base
class to help create those methods from a base set of "__getitem__()",
"__setitem__()", "__delitem__()", and "keys()". Mutable sequences
should provide methods "append()", "count()", "index()", "extend()",
"insert()", "pop()", "remove()", "reverse()" and "sort()", like Python
standard list objects. Finally, sequence types should implement
addition (meaning concatenation) and multiplication (meaning
repetition) by defining the methods "__add__()", "__radd__()",
"__iadd__()", "__mul__()", "__rmul__()" and "__imul__()" described
below; they should not define other numerical operators. It is
recommended that both mappings and sequences implement the
"__contains__()" method to allow efficient use of the "in" operator;
for mappings, "in" should search the mapping’s keys; for sequences, it
should search through the values. It is further recommended that both
mappings and sequences implement the "__iter__()" method to allow
efficient iteration through the container; for mappings, "__iter__()"
should iterate through the object’s keys; for sequences, it should
iterate through the values.
object.__len__(self)
Called to implement the built-in function "len()". Should return
the length of the object, an integer ">=" 0. Also, an object that
doesn’t define a "__bool__()" method and whose "__len__()" method
returns zero is considered to be false in a Boolean context.
**CPython implementation detail:** In CPython, the length is
required to be at most "sys.maxsize". If the length is larger than
"sys.maxsize" some features (such as "len()") may raise
"OverflowError". To prevent raising "OverflowError" by truth value
testing, an object must define a "__bool__()" method.
object.__length_hint__(self)
Called to implement "operator.length_hint()". Should return an
estimated length for the object (which may be greater or less than
the actual length). The length must be an integer ">=" 0. The
return value may also be "NotImplemented", which is treated the
same as if the "__length_hint__" method didn’t exist at all. This
method is purely an optimization and is never required for
correctness.
New in version 3.4.
Note:
Slicing is done exclusively with the following three methods. A
call like
a[1:2] = b
is translated to
a[slice(1, 2, None)] = b
and so forth. Missing slice items are always filled in with "None".
object.__getitem__(self, key)
Called to implement evaluation of "self[key]". For sequence types,
the accepted keys should be integers and slice objects. Note that
the special interpretation of negative indexes (if the class wishes
to emulate a sequence type) is up to the "__getitem__()" method. If
*key* is of an inappropriate type, "TypeError" may be raised; if of
a value outside the set of indexes for the sequence (after any
special interpretation of negative values), "IndexError" should be
raised. For mapping types, if *key* is missing (not in the
container), "KeyError" should be raised.
Note:
"for" loops expect that an "IndexError" will be raised for
illegal indexes to allow proper detection of the end of the
sequence.
object.__setitem__(self, key, value)
Called to implement assignment to "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support changes to the values for keys, or if new keys
can be added, or for sequences if elements can be replaced. The
same exceptions should be raised for improper *key* values as for
the "__getitem__()" method.
object.__delitem__(self, key)
Called to implement deletion of "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support removal of keys, or for sequences if elements
can be removed from the sequence. The same exceptions should be
raised for improper *key* values as for the "__getitem__()" method.
object.__missing__(self, key)
Called by "dict"."__getitem__()" to implement "self[key]" for dict
subclasses when key is not in the dictionary.
object.__iter__(self)
This method is called when an iterator is required for a container.
This method should return a new iterator object that can iterate
over all the objects in the container. For mappings, it should
iterate over the keys of the container.
Iterator objects also need to implement this method; they are
required to return themselves. For more information on iterator
objects, see Iterator Types.
object.__reversed__(self)
Called (if present) by the "reversed()" built-in to implement
reverse iteration. It should return a new iterator object that
iterates over all the objects in the container in reverse order.
If the "__reversed__()" method is not provided, the "reversed()"
built-in will fall back to using the sequence protocol ("__len__()"
and "__getitem__()"). Objects that support the sequence protocol
should only provide "__reversed__()" if they can provide an
implementation that is more efficient than the one provided by
"reversed()".
The membership test operators ("in" and "not in") are normally
implemented as an iteration through a container. However, container
objects can supply the following special method with a more efficient
implementation, which also does not require the object be iterable.
object.__contains__(self, item)
Called to implement membership test operators. Should return true
if *item* is in *self*, false otherwise. For mapping objects, this
should consider the keys of the mapping rather than the values or
the key-item pairs.
For objects that don’t define "__contains__()", the membership test
first tries iteration via "__iter__()", then the old sequence
iteration protocol via "__getitem__()", see this section in the
language reference.
a� Shifting operations
*******************
The shifting operations have lower priority than the arithmetic
operations:
shift_expr ::= a_expr | shift_expr ("<<" | ">>") a_expr
These operators accept integers as arguments. They shift the first
argument to the left or right by the number of bits given by the
second argument.
A right shift by *n* bits is defined as floor division by "pow(2,n)".
A left shift by *n* bits is defined as multiplication with "pow(2,n)".
a� Slicings
********
A slicing selects a range of items in a sequence object (e.g., a
string, tuple or list). Slicings may be used as expressions or as
targets in assignment or "del" statements. The syntax for a slicing:
slicing ::= primary "[" slice_list "]"
slice_list ::= slice_item ("," slice_item)* [","]
slice_item ::= expression | proper_slice
proper_slice ::= [lower_bound] ":" [upper_bound] [ ":" [stride] ]
lower_bound ::= expression
upper_bound ::= expression
stride ::= expression
There is ambiguity in the formal syntax here: anything that looks like
an expression list also looks like a slice list, so any subscription
can be interpreted as a slicing. Rather than further complicating the
syntax, this is disambiguated by defining that in this case the
interpretation as a subscription takes priority over the
interpretation as a slicing (this is the case if the slice list
contains no proper slice).
The semantics for a slicing are as follows. The primary is indexed
(using the same "__getitem__()" method as normal subscription) with a
key that is constructed from the slice list, as follows. If the slice
list contains at least one comma, the key is a tuple containing the
conversion of the slice items; otherwise, the conversion of the lone
slice item is the key. The conversion of a slice item that is an
expression is that expression. The conversion of a proper slice is a
slice object (see section The standard type hierarchy) whose "start",
"stop" and "step" attributes are the values of the expressions given
as lower bound, upper bound and stride, respectively, substituting
"None" for missing expressions.
u Special Attributes
******************
The implementation adds a few special read-only attributes to several
object types, where they are relevant. Some of these are not reported
by the "dir()" built-in function.
object.__dict__
A dictionary or other mapping object used to store an object’s
(writable) attributes.
instance.__class__
The class to which a class instance belongs.
class.__bases__
The tuple of base classes of a class object.
definition.__name__
The name of the class, function, method, descriptor, or generator
instance.
definition.__qualname__
The *qualified name* of the class, function, method, descriptor, or
generator instance.
New in version 3.3.
class.__mro__
This attribute is a tuple of classes that are considered when
looking for base classes during method resolution.
class.mro()
This method can be overridden by a metaclass to customize the
method resolution order for its instances. It is called at class
instantiation, and its result is stored in "__mro__".
class.__subclasses__()
Each class keeps a list of weak references to its immediate
subclasses. This method returns a list of all those references
still alive. Example:
>>> int.__subclasses__()
[<class 'bool'>]
u�� Special method names
********************
A class can implement certain operations that are invoked by special
syntax (such as arithmetic operations or subscripting and slicing) by
defining methods with special names. This is Python’s approach to
*operator overloading*, allowing classes to define their own behavior
with respect to language operators. For instance, if a class defines
a method named "__getitem__()", and "x" is an instance of this class,
then "x[i]" is roughly equivalent to "type(x).__getitem__(x, i)".
Except where mentioned, attempts to execute an operation raise an
exception when no appropriate method is defined (typically
"AttributeError" or "TypeError").
Setting a special method to "None" indicates that the corresponding
operation is not available. For example, if a class sets "__iter__()"
to "None", the class is not iterable, so calling "iter()" on its
instances will raise a "TypeError" (without falling back to
"__getitem__()"). [2]
When implementing a class that emulates any built-in type, it is
important that the emulation only be implemented to the degree that it
makes sense for the object being modelled. For example, some
sequences may work well with retrieval of individual elements, but
extracting a slice may not make sense. (One example of this is the
"NodeList" interface in the W3C’s Document Object Model.)
Basic customization
===================
object.__new__(cls[, ...])
Called to create a new instance of class *cls*. "__new__()" is a
static method (special-cased so you need not declare it as such)
that takes the class of which an instance was requested as its
first argument. The remaining arguments are those passed to the
object constructor expression (the call to the class). The return
value of "__new__()" should be the new object instance (usually an
instance of *cls*).
Typical implementations create a new instance of the class by
invoking the superclass’s "__new__()" method using
"super().__new__(cls[, ...])" with appropriate arguments and then
modifying the newly-created instance as necessary before returning
it.
If "__new__()" is invoked during object construction and it returns
an instance of *cls*, then the new instance’s "__init__()" method
will be invoked like "__init__(self[, ...])", where *self* is the
new instance and the remaining arguments are the same as were
passed to the object constructor.
If "__new__()" does not return an instance of *cls*, then the new
instance’s "__init__()" method will not be invoked.
"__new__()" is intended mainly to allow subclasses of immutable
types (like int, str, or tuple) to customize instance creation. It
is also commonly overridden in custom metaclasses in order to
customize class creation.
object.__init__(self[, ...])
Called after the instance has been created (by "__new__()"), but
before it is returned to the caller. The arguments are those
passed to the class constructor expression. If a base class has an
"__init__()" method, the derived class’s "__init__()" method, if
any, must explicitly call it to ensure proper initialization of the
base class part of the instance; for example:
"super().__init__([args...])".
Because "__new__()" and "__init__()" work together in constructing
objects ("__new__()" to create it, and "__init__()" to customize
it), no non-"None" value may be returned by "__init__()"; doing so
will cause a "TypeError" to be raised at runtime.
object.__del__(self)
Called when the instance is about to be destroyed. This is also
called a finalizer or (improperly) a destructor. If a base class
has a "__del__()" method, the derived class’s "__del__()" method,
if any, must explicitly call it to ensure proper deletion of the
base class part of the instance.
It is possible (though not recommended!) for the "__del__()" method
to postpone destruction of the instance by creating a new reference
to it. This is called object *resurrection*. It is
implementation-dependent whether "__del__()" is called a second
time when a resurrected object is about to be destroyed; the
current *CPython* implementation only calls it once.
It is not guaranteed that "__del__()" methods are called for
objects that still exist when the interpreter exits.
Note:
"del x" doesn’t directly call "x.__del__()" — the former
decrements the reference count for "x" by one, and the latter is
only called when "x"’s reference count reaches zero.
**CPython implementation detail:** It is possible for a reference
cycle to prevent the reference count of an object from going to
zero. In this case, the cycle will be later detected and deleted
by the *cyclic garbage collector*. A common cause of reference
cycles is when an exception has been caught in a local variable.
The frame’s locals then reference the exception, which references
its own traceback, which references the locals of all frames caught
in the traceback.
See also: Documentation for the "gc" module.
Warning:
Due to the precarious circumstances under which "__del__()"
methods are invoked, exceptions that occur during their execution
are ignored, and a warning is printed to "sys.stderr" instead.
In particular:
* "__del__()" can be invoked when arbitrary code is being
executed, including from any arbitrary thread. If "__del__()"
needs to take a lock or invoke any other blocking resource, it
may deadlock as the resource may already be taken by the code
that gets interrupted to execute "__del__()".
* "__del__()" can be executed during interpreter shutdown. As a
consequence, the global variables it needs to access (including
other modules) may already have been deleted or set to "None".
Python guarantees that globals whose name begins with a single
underscore are deleted from their module before other globals
are deleted; if no other references to such globals exist, this
may help in assuring that imported modules are still available
at the time when the "__del__()" method is called.
object.__repr__(self)
Called by the "repr()" built-in function to compute the “official”
string representation of an object. If at all possible, this
should look like a valid Python expression that could be used to
recreate an object with the same value (given an appropriate
environment). If this is not possible, a string of the form
"<...some useful description...>" should be returned. The return
value must be a string object. If a class defines "__repr__()" but
not "__str__()", then "__repr__()" is also used when an “informal”
string representation of instances of that class is required.
This is typically used for debugging, so it is important that the
representation is information-rich and unambiguous.
object.__str__(self)
Called by "str(object)" and the built-in functions "format()" and
"print()" to compute the “informal” or nicely printable string
representation of an object. The return value must be a string
object.
This method differs from "object.__repr__()" in that there is no
expectation that "__str__()" return a valid Python expression: a
more convenient or concise representation can be used.
The default implementation defined by the built-in type "object"
calls "object.__repr__()".
object.__bytes__(self)
Called by bytes to compute a byte-string representation of an
object. This should return a "bytes" object.
object.__format__(self, format_spec)
Called by the "format()" built-in function, and by extension,
evaluation of formatted string literals and the "str.format()"
method, to produce a “formatted” string representation of an
object. The *format_spec* argument is a string that contains a
description of the formatting options desired. The interpretation
of the *format_spec* argument is up to the type implementing
"__format__()", however most classes will either delegate
formatting to one of the built-in types, or use a similar
formatting option syntax.
See Format Specification Mini-Language for a description of the
standard formatting syntax.
The return value must be a string object.
Changed in version 3.4: The __format__ method of "object" itself
raises a "TypeError" if passed any non-empty string.
Changed in version 3.7: "object.__format__(x, '')" is now
equivalent to "str(x)" rather than "format(str(self), '')".
object.__lt__(self, other)
object.__le__(self, other)
object.__eq__(self, other)
object.__ne__(self, other)
object.__gt__(self, other)
object.__ge__(self, other)
These are the so-called “rich comparison” methods. The
correspondence between operator symbols and method names is as
follows: "x<y" calls "x.__lt__(y)", "x<=y" calls "x.__le__(y)",
"x==y" calls "x.__eq__(y)", "x!=y" calls "x.__ne__(y)", "x>y" calls
"x.__gt__(y)", and "x>=y" calls "x.__ge__(y)".
A rich comparison method may return the singleton "NotImplemented"
if it does not implement the operation for a given pair of
arguments. By convention, "False" and "True" are returned for a
successful comparison. However, these methods can return any value,
so if the comparison operator is used in a Boolean context (e.g.,
in the condition of an "if" statement), Python will call "bool()"
on the value to determine if the result is true or false.
By default, "object" implements "__eq__()" by using "is", returning
"NotImplemented" in the case of a false comparison: "True if x is y
else NotImplemented". For "__ne__()", by default it delegates to
"__eq__()" and inverts the result unless it is "NotImplemented".
There are no other implied relationships among the comparison
operators or default implementations; for example, the truth of
"(x<y or x==y)" does not imply "x<=y". To automatically generate
ordering operations from a single root operation, see
"functools.total_ordering()".
See the paragraph on "__hash__()" for some important notes on
creating *hashable* objects which support custom comparison
operations and are usable as dictionary keys.
There are no swapped-argument versions of these methods (to be used
when the left argument does not support the operation but the right
argument does); rather, "__lt__()" and "__gt__()" are each other’s
reflection, "__le__()" and "__ge__()" are each other’s reflection,
and "__eq__()" and "__ne__()" are their own reflection. If the
operands are of different types, and right operand’s type is a
direct or indirect subclass of the left operand’s type, the
reflected method of the right operand has priority, otherwise the
left operand’s method has priority. Virtual subclassing is not
considered.
object.__hash__(self)
Called by built-in function "hash()" and for operations on members
of hashed collections including "set", "frozenset", and "dict".
"__hash__()" should return an integer. The only required property
is that objects which compare equal have the same hash value; it is
advised to mix together the hash values of the components of the
object that also play a part in comparison of objects by packing
them into a tuple and hashing the tuple. Example:
def __hash__(self):
return hash((self.name, self.nick, self.color))
Note:
"hash()" truncates the value returned from an object’s custom
"__hash__()" method to the size of a "Py_ssize_t". This is
typically 8 bytes on 64-bit builds and 4 bytes on 32-bit builds.
If an object’s "__hash__()" must interoperate on builds of
different bit sizes, be sure to check the width on all supported
builds. An easy way to do this is with "python -c "import sys;
print(sys.hash_info.width)"".
If a class does not define an "__eq__()" method it should not
define a "__hash__()" operation either; if it defines "__eq__()"
but not "__hash__()", its instances will not be usable as items in
hashable collections. If a class defines mutable objects and
implements an "__eq__()" method, it should not implement
"__hash__()", since the implementation of hashable collections
requires that a key’s hash value is immutable (if the object’s hash
value changes, it will be in the wrong hash bucket).
User-defined classes have "__eq__()" and "__hash__()" methods by
default; with them, all objects compare unequal (except with
themselves) and "x.__hash__()" returns an appropriate value such
that "x == y" implies both that "x is y" and "hash(x) == hash(y)".
A class that overrides "__eq__()" and does not define "__hash__()"
will have its "__hash__()" implicitly set to "None". When the
"__hash__()" method of a class is "None", instances of the class
will raise an appropriate "TypeError" when a program attempts to
retrieve their hash value, and will also be correctly identified as
unhashable when checking "isinstance(obj,
collections.abc.Hashable)".
If a class that overrides "__eq__()" needs to retain the
implementation of "__hash__()" from a parent class, the interpreter
must be told this explicitly by setting "__hash__ =
<ParentClass>.__hash__".
If a class that does not override "__eq__()" wishes to suppress
hash support, it should include "__hash__ = None" in the class
definition. A class which defines its own "__hash__()" that
explicitly raises a "TypeError" would be incorrectly identified as
hashable by an "isinstance(obj, collections.abc.Hashable)" call.
Note:
By default, the "__hash__()" values of str and bytes objects are
“salted” with an unpredictable random value. Although they
remain constant within an individual Python process, they are not
predictable between repeated invocations of Python.This is
intended to provide protection against a denial-of-service caused
by carefully-chosen inputs that exploit the worst case
performance of a dict insertion, O(n^2) complexity. See
http://www.ocert.org/advisories/ocert-2011-003.html for
details.Changing hash values affects the iteration order of sets.
Python has never made guarantees about this ordering (and it
typically varies between 32-bit and 64-bit builds).See also
"PYTHONHASHSEED".
Changed in version 3.3: Hash randomization is enabled by default.
object.__bool__(self)
Called to implement truth value testing and the built-in operation
"bool()"; should return "False" or "True". When this method is not
defined, "__len__()" is called, if it is defined, and the object is
considered true if its result is nonzero. If a class defines
neither "__len__()" nor "__bool__()", all its instances are
considered true.
Customizing attribute access
============================
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of "x.name") for
class instances.
object.__getattr__(self, name)
Called when the default attribute access fails with an
"AttributeError" (either "__getattribute__()" raises an
"AttributeError" because *name* is not an instance attribute or an
attribute in the class tree for "self"; or "__get__()" of a *name*
property raises "AttributeError"). This method should either
return the (computed) attribute value or raise an "AttributeError"
exception.
Note that if the attribute is found through the normal mechanism,
"__getattr__()" is not called. (This is an intentional asymmetry
between "__getattr__()" and "__setattr__()".) This is done both for
efficiency reasons and because otherwise "__getattr__()" would have
no way to access other attributes of the instance. Note that at
least for instance variables, you can fake total control by not
inserting any values in the instance attribute dictionary (but
instead inserting them in another object). See the
"__getattribute__()" method below for a way to actually get total
control over attribute access.
object.__getattribute__(self, name)
Called unconditionally to implement attribute accesses for
instances of the class. If the class also defines "__getattr__()",
the latter will not be called unless "__getattribute__()" either
calls it explicitly or raises an "AttributeError". This method
should return the (computed) attribute value or raise an
"AttributeError" exception. In order to avoid infinite recursion in
this method, its implementation should always call the base class
method with the same name to access any attributes it needs, for
example, "object.__getattribute__(self, name)".
Note:
This method may still be bypassed when looking up special methods
as the result of implicit invocation via language syntax or
built-in functions. See Special method lookup.
For certain sensitive attribute accesses, raises an auditing event
"object.__getattr__" with arguments "obj" and "name".
object.__setattr__(self, name, value)
Called when an attribute assignment is attempted. This is called
instead of the normal mechanism (i.e. store the value in the
instance dictionary). *name* is the attribute name, *value* is the
value to be assigned to it.
If "__setattr__()" wants to assign to an instance attribute, it
should call the base class method with the same name, for example,
"object.__setattr__(self, name, value)".
For certain sensitive attribute assignments, raises an auditing
event "object.__setattr__" with arguments "obj", "name", "value".
object.__delattr__(self, name)
Like "__setattr__()" but for attribute deletion instead of
assignment. This should only be implemented if "del obj.name" is
meaningful for the object.
For certain sensitive attribute deletions, raises an auditing event
"object.__delattr__" with arguments "obj" and "name".
object.__dir__(self)
Called when "dir()" is called on the object. A sequence must be
returned. "dir()" converts the returned sequence to a list and
sorts it.
Customizing module attribute access
-----------------------------------
Special names "__getattr__" and "__dir__" can be also used to
customize access to module attributes. The "__getattr__" function at
the module level should accept one argument which is the name of an
attribute and return the computed value or raise an "AttributeError".
If an attribute is not found on a module object through the normal
lookup, i.e. "object.__getattribute__()", then "__getattr__" is
searched in the module "__dict__" before raising an "AttributeError".
If found, it is called with the attribute name and the result is
returned.
The "__dir__" function should accept no arguments, and return a
sequence of strings that represents the names accessible on module. If
present, this function overrides the standard "dir()" search on a
module.
For a more fine grained customization of the module behavior (setting
attributes, properties, etc.), one can set the "__class__" attribute
of a module object to a subclass of "types.ModuleType". For example:
import sys
from types import ModuleType
class VerboseModule(ModuleType):
def __repr__(self):
return f'Verbose {self.__name__}'
def __setattr__(self, attr, value):
print(f'Setting {attr}...')
super().__setattr__(attr, value)
sys.modules[__name__].__class__ = VerboseModule
Note:
Defining module "__getattr__" and setting module "__class__" only
affect lookups made using the attribute access syntax – directly
accessing the module globals (whether by code within the module, or
via a reference to the module’s globals dictionary) is unaffected.
Changed in version 3.5: "__class__" module attribute is now writable.
New in version 3.7: "__getattr__" and "__dir__" module attributes.
See also:
**PEP 562** - Module __getattr__ and __dir__
Describes the "__getattr__" and "__dir__" functions on modules.
Implementing Descriptors
------------------------
The following methods only apply when an instance of the class
containing the method (a so-called *descriptor* class) appears in an
*owner* class (the descriptor must be in either the owner’s class
dictionary or in the class dictionary for one of its parents). In the
examples below, “the attribute” refers to the attribute whose name is
the key of the property in the owner class’ "__dict__".
object.__get__(self, instance, owner=None)
Called to get the attribute of the owner class (class attribute
access) or of an instance of that class (instance attribute
access). The optional *owner* argument is the owner class, while
*instance* is the instance that the attribute was accessed through,
or "None" when the attribute is accessed through the *owner*.
This method should return the computed attribute value or raise an
"AttributeError" exception.
**PEP 252** specifies that "__get__()" is callable with one or two
arguments. Python’s own built-in descriptors support this
specification; however, it is likely that some third-party tools
have descriptors that require both arguments. Python’s own
"__getattribute__()" implementation always passes in both arguments
whether they are required or not.
object.__set__(self, instance, value)
Called to set the attribute on an instance *instance* of the owner
class to a new value, *value*.
Note, adding "__set__()" or "__delete__()" changes the kind of
descriptor to a “data descriptor”. See Invoking Descriptors for
more details.
object.__delete__(self, instance)
Called to delete the attribute on an instance *instance* of the
owner class.
object.__set_name__(self, owner, name)
Called at the time the owning class *owner* is created. The
descriptor has been assigned to *name*.
Note:
"__set_name__()" is only called implicitly as part of the "type"
constructor, so it will need to be called explicitly with the
appropriate parameters when a descriptor is added to a class
after initial creation:
class A:
pass
descr = custom_descriptor()
A.attr = descr
descr.__set_name__(A, 'attr')
See Creating the class object for more details.
New in version 3.6.
The attribute "__objclass__" is interpreted by the "inspect" module as
specifying the class where this object was defined (setting this
appropriately can assist in runtime introspection of dynamic class
attributes). For callables, it may indicate that an instance of the
given type (or a subclass) is expected or required as the first
positional argument (for example, CPython sets this attribute for
unbound methods that are implemented in C).
Invoking Descriptors
--------------------
In general, a descriptor is an object attribute with “binding
behavior”, one whose attribute access has been overridden by methods
in the descriptor protocol: "__get__()", "__set__()", and
"__delete__()". If any of those methods are defined for an object, it
is said to be a descriptor.
The default behavior for attribute access is to get, set, or delete
the attribute from an object’s dictionary. For instance, "a.x" has a
lookup chain starting with "a.__dict__['x']", then
"type(a).__dict__['x']", and continuing through the base classes of
"type(a)" excluding metaclasses.
However, if the looked-up value is an object defining one of the
descriptor methods, then Python may override the default behavior and
invoke the descriptor method instead. Where this occurs in the
precedence chain depends on which descriptor methods were defined and
how they were called.
The starting point for descriptor invocation is a binding, "a.x". How
the arguments are assembled depends on "a":
Direct Call
The simplest and least common call is when user code directly
invokes a descriptor method: "x.__get__(a)".
Instance Binding
If binding to an object instance, "a.x" is transformed into the
call: "type(a).__dict__['x'].__get__(a, type(a))".
Class Binding
If binding to a class, "A.x" is transformed into the call:
"A.__dict__['x'].__get__(None, A)".
Super Binding
If "a" is an instance of "super", then the binding "super(B,
obj).m()" searches "obj.__class__.__mro__" for the base class "A"
immediately preceding "B" and then invokes the descriptor with the
call: "A.__dict__['m'].__get__(obj, obj.__class__)".
For instance bindings, the precedence of descriptor invocation depends
on which descriptor methods are defined. A descriptor can define any
combination of "__get__()", "__set__()" and "__delete__()". If it
does not define "__get__()", then accessing the attribute will return
the descriptor object itself unless there is a value in the object’s
instance dictionary. If the descriptor defines "__set__()" and/or
"__delete__()", it is a data descriptor; if it defines neither, it is
a non-data descriptor. Normally, data descriptors define both
"__get__()" and "__set__()", while non-data descriptors have just the
"__get__()" method. Data descriptors with "__set__()" and "__get__()"
defined always override a redefinition in an instance dictionary. In
contrast, non-data descriptors can be overridden by instances.
Python methods (including "staticmethod()" and "classmethod()") are
implemented as non-data descriptors. Accordingly, instances can
redefine and override methods. This allows individual instances to
acquire behaviors that differ from other instances of the same class.
The "property()" function is implemented as a data descriptor.
Accordingly, instances cannot override the behavior of a property.
__slots__
---------
*__slots__* allow us to explicitly declare data members (like
properties) and deny the creation of *__dict__* and *__weakref__*
(unless explicitly declared in *__slots__* or available in a parent.)
The space saved over using *__dict__* can be significant. Attribute
lookup speed can be significantly improved as well.
object.__slots__
This class variable can be assigned a string, iterable, or sequence
of strings with variable names used by instances. *__slots__*
reserves space for the declared variables and prevents the
automatic creation of *__dict__* and *__weakref__* for each
instance.
Notes on using *__slots__*
~~~~~~~~~~~~~~~~~~~~~~~~~~
* When inheriting from a class without *__slots__*, the *__dict__* and
*__weakref__* attribute of the instances will always be accessible.
* Without a *__dict__* variable, instances cannot be assigned new
variables not listed in the *__slots__* definition. Attempts to
assign to an unlisted variable name raises "AttributeError". If
dynamic assignment of new variables is desired, then add
"'__dict__'" to the sequence of strings in the *__slots__*
declaration.
* Without a *__weakref__* variable for each instance, classes defining
*__slots__* do not support weak references to its instances. If weak
reference support is needed, then add "'__weakref__'" to the
sequence of strings in the *__slots__* declaration.
* *__slots__* are implemented at the class level by creating
descriptors (Implementing Descriptors) for each variable name. As a
result, class attributes cannot be used to set default values for
instance variables defined by *__slots__*; otherwise, the class
attribute would overwrite the descriptor assignment.
* The action of a *__slots__* declaration is not limited to the class
where it is defined. *__slots__* declared in parents are available
in child classes. However, child subclasses will get a *__dict__*
and *__weakref__* unless they also define *__slots__* (which should
only contain names of any *additional* slots).
* If a class defines a slot also defined in a base class, the instance
variable defined by the base class slot is inaccessible (except by
retrieving its descriptor directly from the base class). This
renders the meaning of the program undefined. In the future, a
check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from
“variable-length” built-in types such as "int", "bytes" and "tuple".
* Any non-string iterable may be assigned to *__slots__*. Mappings may
also be used; however, in the future, special meaning may be
assigned to the values corresponding to each key.
* *__class__* assignment works only if both classes have the same
*__slots__*.
* Multiple inheritance with multiple slotted parent classes can be
used, but only one parent is allowed to have attributes created by
slots (the other bases must have empty slot layouts) - violations
raise "TypeError".
* If an iterator is used for *__slots__* then a descriptor is created
for each of the iterator’s values. However, the *__slots__*
attribute will be an empty iterator.
Customizing class creation
==========================
Whenever a class inherits from another class, *__init_subclass__* is
called on that class. This way, it is possible to write classes which
change the behavior of subclasses. This is closely related to class
decorators, but where class decorators only affect the specific class
they’re applied to, "__init_subclass__" solely applies to future
subclasses of the class defining the method.
classmethod object.__init_subclass__(cls)
This method is called whenever the containing class is subclassed.
*cls* is then the new subclass. If defined as a normal instance
method, this method is implicitly converted to a class method.
Keyword arguments which are given to a new class are passed to the
parent’s class "__init_subclass__". For compatibility with other
classes using "__init_subclass__", one should take out the needed
keyword arguments and pass the others over to the base class, as
in:
class Philosopher:
def __init_subclass__(cls, /, default_name, **kwargs):
super().__init_subclass__(**kwargs)
cls.default_name = default_name
class AustralianPhilosopher(Philosopher, default_name="Bruce"):
pass
The default implementation "object.__init_subclass__" does nothing,
but raises an error if it is called with any arguments.
Note:
The metaclass hint "metaclass" is consumed by the rest of the
type machinery, and is never passed to "__init_subclass__"
implementations. The actual metaclass (rather than the explicit
hint) can be accessed as "type(cls)".
New in version 3.6.
Metaclasses
-----------
By default, classes are constructed using "type()". The class body is
executed in a new namespace and the class name is bound locally to the
result of "type(name, bases, namespace)".
The class creation process can be customized by passing the
"metaclass" keyword argument in the class definition line, or by
inheriting from an existing class that included such an argument. In
the following example, both "MyClass" and "MySubclass" are instances
of "Meta":
class Meta(type):
pass
class MyClass(metaclass=Meta):
pass
class MySubclass(MyClass):
pass
Any other keyword arguments that are specified in the class definition
are passed through to all metaclass operations described below.
When a class definition is executed, the following steps occur:
* MRO entries are resolved;
* the appropriate metaclass is determined;
* the class namespace is prepared;
* the class body is executed;
* the class object is created.
Resolving MRO entries
---------------------
If a base that appears in class definition is not an instance of
"type", then an "__mro_entries__" method is searched on it. If found,
it is called with the original bases tuple. This method must return a
tuple of classes that will be used instead of this base. The tuple may
be empty, in such case the original base is ignored.
See also:
**PEP 560** - Core support for typing module and generic types
Determining the appropriate metaclass
-------------------------------------
The appropriate metaclass for a class definition is determined as
follows:
* if no bases and no explicit metaclass are given, then "type()" is
used;
* if an explicit metaclass is given and it is *not* an instance of
"type()", then it is used directly as the metaclass;
* if an instance of "type()" is given as the explicit metaclass, or
bases are defined, then the most derived metaclass is used.
The most derived metaclass is selected from the explicitly specified
metaclass (if any) and the metaclasses (i.e. "type(cls)") of all
specified base classes. The most derived metaclass is one which is a
subtype of *all* of these candidate metaclasses. If none of the
candidate metaclasses meets that criterion, then the class definition
will fail with "TypeError".
Preparing the class namespace
-----------------------------
Once the appropriate metaclass has been identified, then the class
namespace is prepared. If the metaclass has a "__prepare__" attribute,
it is called as "namespace = metaclass.__prepare__(name, bases,
**kwds)" (where the additional keyword arguments, if any, come from
the class definition). The "__prepare__" method should be implemented
as a "classmethod()". The namespace returned by "__prepare__" is
passed in to "__new__", but when the final class object is created the
namespace is copied into a new "dict".
If the metaclass has no "__prepare__" attribute, then the class
namespace is initialised as an empty ordered mapping.
See also:
**PEP 3115** - Metaclasses in Python 3000
Introduced the "__prepare__" namespace hook
Executing the class body
------------------------
The class body is executed (approximately) as "exec(body, globals(),
namespace)". The key difference from a normal call to "exec()" is that
lexical scoping allows the class body (including any methods) to
reference names from the current and outer scopes when the class
definition occurs inside a function.
However, even when the class definition occurs inside the function,
methods defined inside the class still cannot see names defined at the
class scope. Class variables must be accessed through the first
parameter of instance or class methods, or through the implicit
lexically scoped "__class__" reference described in the next section.
Creating the class object
-------------------------
Once the class namespace has been populated by executing the class
body, the class object is created by calling "metaclass(name, bases,
namespace, **kwds)" (the additional keywords passed here are the same
as those passed to "__prepare__").
This class object is the one that will be referenced by the zero-
argument form of "super()". "__class__" is an implicit closure
reference created by the compiler if any methods in a class body refer
to either "__class__" or "super". This allows the zero argument form
of "super()" to correctly identify the class being defined based on
lexical scoping, while the class or instance that was used to make the
current call is identified based on the first argument passed to the
method.
**CPython implementation detail:** In CPython 3.6 and later, the
"__class__" cell is passed to the metaclass as a "__classcell__" entry
in the class namespace. If present, this must be propagated up to the
"type.__new__" call in order for the class to be initialised
correctly. Failing to do so will result in a "RuntimeError" in Python
3.8.
When using the default metaclass "type", or any metaclass that
ultimately calls "type.__new__", the following additional
customisation steps are invoked after creating the class object:
* first, "type.__new__" collects all of the descriptors in the class
namespace that define a "__set_name__()" method;
* second, all of these "__set_name__" methods are called with the
class being defined and the assigned name of that particular
descriptor;
* finally, the "__init_subclass__()" hook is called on the immediate
parent of the new class in its method resolution order.
After the class object is created, it is passed to the class
decorators included in the class definition (if any) and the resulting
object is bound in the local namespace as the defined class.
When a new class is created by "type.__new__", the object provided as
the namespace parameter is copied to a new ordered mapping and the
original object is discarded. The new copy is wrapped in a read-only
proxy, which becomes the "__dict__" attribute of the class object.
See also:
**PEP 3135** - New super
Describes the implicit "__class__" closure reference
Uses for metaclasses
--------------------
The potential uses for metaclasses are boundless. Some ideas that have
been explored include enum, logging, interface checking, automatic
delegation, automatic property creation, proxies, frameworks, and
automatic resource locking/synchronization.
Customizing instance and subclass checks
========================================
The following methods are used to override the default behavior of the
"isinstance()" and "issubclass()" built-in functions.
In particular, the metaclass "abc.ABCMeta" implements these methods in
order to allow the addition of Abstract Base Classes (ABCs) as
“virtual base classes” to any class or type (including built-in
types), including other ABCs.
class.__instancecheck__(self, instance)
Return true if *instance* should be considered a (direct or
indirect) instance of *class*. If defined, called to implement
"isinstance(instance, class)".
class.__subclasscheck__(self, subclass)
Return true if *subclass* should be considered a (direct or
indirect) subclass of *class*. If defined, called to implement
"issubclass(subclass, class)".
Note that these methods are looked up on the type (metaclass) of a
class. They cannot be defined as class methods in the actual class.
This is consistent with the lookup of special methods that are called
on instances, only in this case the instance is itself a class.
See also:
**PEP 3119** - Introducing Abstract Base Classes
Includes the specification for customizing "isinstance()" and
"issubclass()" behavior through "__instancecheck__()" and
"__subclasscheck__()", with motivation for this functionality in
the context of adding Abstract Base Classes (see the "abc"
module) to the language.
Emulating generic types
=======================
One can implement the generic class syntax as specified by **PEP 484**
(for example "List[int]") by defining a special method:
classmethod object.__class_getitem__(cls, key)
Return an object representing the specialization of a generic class
by type arguments found in *key*.
This method is looked up on the class object itself, and when defined
in the class body, this method is implicitly a class method. Note,
this mechanism is primarily reserved for use with static type hints,
other usage is discouraged.
See also:
**PEP 560** - Core support for typing module and generic types
Emulating callable objects
==========================
object.__call__(self[, args...])
Called when the instance is “called” as a function; if this method
is defined, "x(arg1, arg2, ...)" roughly translates to
"type(x).__call__(x, arg1, ...)".
Emulating container types
=========================
The following methods can be defined to implement container objects.
Containers usually are sequences (such as lists or tuples) or mappings
(like dictionaries), but can represent other containers as well. The
first set of methods is used either to emulate a sequence or to
emulate a mapping; the difference is that for a sequence, the
allowable keys should be the integers *k* for which "0 <= k < N" where
*N* is the length of the sequence, or slice objects, which define a
range of items. It is also recommended that mappings provide the
methods "keys()", "values()", "items()", "get()", "clear()",
"setdefault()", "pop()", "popitem()", "copy()", and "update()"
behaving similar to those for Python’s standard dictionary objects.
The "collections.abc" module provides a "MutableMapping" abstract base
class to help create those methods from a base set of "__getitem__()",
"__setitem__()", "__delitem__()", and "keys()". Mutable sequences
should provide methods "append()", "count()", "index()", "extend()",
"insert()", "pop()", "remove()", "reverse()" and "sort()", like Python
standard list objects. Finally, sequence types should implement
addition (meaning concatenation) and multiplication (meaning
repetition) by defining the methods "__add__()", "__radd__()",
"__iadd__()", "__mul__()", "__rmul__()" and "__imul__()" described
below; they should not define other numerical operators. It is
recommended that both mappings and sequences implement the
"__contains__()" method to allow efficient use of the "in" operator;
for mappings, "in" should search the mapping’s keys; for sequences, it
should search through the values. It is further recommended that both
mappings and sequences implement the "__iter__()" method to allow
efficient iteration through the container; for mappings, "__iter__()"
should iterate through the object’s keys; for sequences, it should
iterate through the values.
object.__len__(self)
Called to implement the built-in function "len()". Should return
the length of the object, an integer ">=" 0. Also, an object that
doesn’t define a "__bool__()" method and whose "__len__()" method
returns zero is considered to be false in a Boolean context.
**CPython implementation detail:** In CPython, the length is
required to be at most "sys.maxsize". If the length is larger than
"sys.maxsize" some features (such as "len()") may raise
"OverflowError". To prevent raising "OverflowError" by truth value
testing, an object must define a "__bool__()" method.
object.__length_hint__(self)
Called to implement "operator.length_hint()". Should return an
estimated length for the object (which may be greater or less than
the actual length). The length must be an integer ">=" 0. The
return value may also be "NotImplemented", which is treated the
same as if the "__length_hint__" method didn’t exist at all. This
method is purely an optimization and is never required for
correctness.
New in version 3.4.
Note:
Slicing is done exclusively with the following three methods. A
call like
a[1:2] = b
is translated to
a[slice(1, 2, None)] = b
and so forth. Missing slice items are always filled in with "None".
object.__getitem__(self, key)
Called to implement evaluation of "self[key]". For sequence types,
the accepted keys should be integers and slice objects. Note that
the special interpretation of negative indexes (if the class wishes
to emulate a sequence type) is up to the "__getitem__()" method. If
*key* is of an inappropriate type, "TypeError" may be raised; if of
a value outside the set of indexes for the sequence (after any
special interpretation of negative values), "IndexError" should be
raised. For mapping types, if *key* is missing (not in the
container), "KeyError" should be raised.
Note:
"for" loops expect that an "IndexError" will be raised for
illegal indexes to allow proper detection of the end of the
sequence.
object.__setitem__(self, key, value)
Called to implement assignment to "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support changes to the values for keys, or if new keys
can be added, or for sequences if elements can be replaced. The
same exceptions should be raised for improper *key* values as for
the "__getitem__()" method.
object.__delitem__(self, key)
Called to implement deletion of "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support removal of keys, or for sequences if elements
can be removed from the sequence. The same exceptions should be
raised for improper *key* values as for the "__getitem__()" method.
object.__missing__(self, key)
Called by "dict"."__getitem__()" to implement "self[key]" for dict
subclasses when key is not in the dictionary.
object.__iter__(self)
This method is called when an iterator is required for a container.
This method should return a new iterator object that can iterate
over all the objects in the container. For mappings, it should
iterate over the keys of the container.
Iterator objects also need to implement this method; they are
required to return themselves. For more information on iterator
objects, see Iterator Types.
object.__reversed__(self)
Called (if present) by the "reversed()" built-in to implement
reverse iteration. It should return a new iterator object that
iterates over all the objects in the container in reverse order.
If the "__reversed__()" method is not provided, the "reversed()"
built-in will fall back to using the sequence protocol ("__len__()"
and "__getitem__()"). Objects that support the sequence protocol
should only provide "__reversed__()" if they can provide an
implementation that is more efficient than the one provided by
"reversed()".
The membership test operators ("in" and "not in") are normally
implemented as an iteration through a container. However, container
objects can supply the following special method with a more efficient
implementation, which also does not require the object be iterable.
object.__contains__(self, item)
Called to implement membership test operators. Should return true
if *item* is in *self*, false otherwise. For mapping objects, this
should consider the keys of the mapping rather than the values or
the key-item pairs.
For objects that don’t define "__contains__()", the membership test
first tries iteration via "__iter__()", then the old sequence
iteration protocol via "__getitem__()", see this section in the
language reference.
Emulating numeric types
=======================
The following methods can be defined to emulate numeric objects.
Methods corresponding to operations that are not supported by the
particular kind of number implemented (e.g., bitwise operations for
non-integral numbers) should be left undefined.
object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__matmul__(self, other)
object.__truediv__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|"). For instance, to
evaluate the expression "x + y", where *x* is an instance of a
class that has an "__add__()" method, "x.__add__(y)" is called.
The "__divmod__()" method should be the equivalent to using
"__floordiv__()" and "__mod__()"; it should not be related to
"__truediv__()". Note that "__pow__()" should be defined to accept
an optional third argument if the ternary version of the built-in
"pow()" function is to be supported.
If one of those methods does not support the operation with the
supplied arguments, it should return "NotImplemented".
object.__radd__(self, other)
object.__rsub__(self, other)
object.__rmul__(self, other)
object.__rmatmul__(self, other)
object.__rtruediv__(self, other)
object.__rfloordiv__(self, other)
object.__rmod__(self, other)
object.__rdivmod__(self, other)
object.__rpow__(self, other[, modulo])
object.__rlshift__(self, other)
object.__rrshift__(self, other)
object.__rand__(self, other)
object.__rxor__(self, other)
object.__ror__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|") with reflected (swapped)
operands. These functions are only called if the left operand does
not support the corresponding operation [3] and the operands are of
different types. [4] For instance, to evaluate the expression "x -
y", where *y* is an instance of a class that has an "__rsub__()"
method, "y.__rsub__(x)" is called if "x.__sub__(y)" returns
*NotImplemented*.
Note that ternary "pow()" will not try calling "__rpow__()" (the
coercion rules would become too complicated).
Note:
If the right operand’s type is a subclass of the left operand’s
type and that subclass provides a different implementation of the
reflected method for the operation, this method will be called
before the left operand’s non-reflected method. This behavior
allows subclasses to override their ancestors’ operations.
object.__iadd__(self, other)
object.__isub__(self, other)
object.__imul__(self, other)
object.__imatmul__(self, other)
object.__itruediv__(self, other)
object.__ifloordiv__(self, other)
object.__imod__(self, other)
object.__ipow__(self, other[, modulo])
object.__ilshift__(self, other)
object.__irshift__(self, other)
object.__iand__(self, other)
object.__ixor__(self, other)
object.__ior__(self, other)
These methods are called to implement the augmented arithmetic
assignments ("+=", "-=", "*=", "@=", "/=", "//=", "%=", "**=",
"<<=", ">>=", "&=", "^=", "|="). These methods should attempt to
do the operation in-place (modifying *self*) and return the result
(which could be, but does not have to be, *self*). If a specific
method is not defined, the augmented assignment falls back to the
normal methods. For instance, if *x* is an instance of a class
with an "__iadd__()" method, "x += y" is equivalent to "x =
x.__iadd__(y)" . Otherwise, "x.__add__(y)" and "y.__radd__(x)" are
considered, as with the evaluation of "x + y". In certain
situations, augmented assignment can result in unexpected errors
(see Why does a_tuple[i] += [‘item’] raise an exception when the
addition works?), but this behavior is in fact part of the data
model.
Note:
Due to a bug in the dispatching mechanism for "**=", a class that
defines "__ipow__()" but returns "NotImplemented" would fail to
fall back to "x.__pow__(y)" and "y.__rpow__(x)". This bug is
fixed in Python 3.10.
object.__neg__(self)
object.__pos__(self)
object.__abs__(self)
object.__invert__(self)
Called to implement the unary arithmetic operations ("-", "+",
"abs()" and "~").
object.__complex__(self)
object.__int__(self)
object.__float__(self)
Called to implement the built-in functions "complex()", "int()" and
"float()". Should return a value of the appropriate type.
object.__index__(self)
Called to implement "operator.index()", and whenever Python needs
to losslessly convert the numeric object to an integer object (such
as in slicing, or in the built-in "bin()", "hex()" and "oct()"
functions). Presence of this method indicates that the numeric
object is an integer type. Must return an integer.
If "__int__()", "__float__()" and "__complex__()" are not defined
then corresponding built-in functions "int()", "float()" and
"complex()" fall back to "__index__()".
object.__round__(self[, ndigits])
object.__trunc__(self)
object.__floor__(self)
object.__ceil__(self)
Called to implement the built-in function "round()" and "math"
functions "trunc()", "floor()" and "ceil()". Unless *ndigits* is
passed to "__round__()" all these methods should return the value
of the object truncated to an "Integral" (typically an "int").
The built-in function "int()" falls back to "__trunc__()" if
neither "__int__()" nor "__index__()" is defined.
With Statement Context Managers
===============================
A *context manager* is an object that defines the runtime context to
be established when executing a "with" statement. The context manager
handles the entry into, and the exit from, the desired runtime context
for the execution of the block of code. Context managers are normally
invoked using the "with" statement (described in section The with
statement), but can also be used by directly invoking their methods.
Typical uses of context managers include saving and restoring various
kinds of global state, locking and unlocking resources, closing opened
files, etc.
For more information on context managers, see Context Manager Types.
object.__enter__(self)
Enter the runtime context related to this object. The "with"
statement will bind this method’s return value to the target(s)
specified in the "as" clause of the statement, if any.
object.__exit__(self, exc_type, exc_value, traceback)
Exit the runtime context related to this object. The parameters
describe the exception that caused the context to be exited. If the
context was exited without an exception, all three arguments will
be "None".
If an exception is supplied, and the method wishes to suppress the
exception (i.e., prevent it from being propagated), it should
return a true value. Otherwise, the exception will be processed
normally upon exit from this method.
Note that "__exit__()" methods should not reraise the passed-in
exception; this is the caller’s responsibility.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
Special method lookup
=====================
For custom classes, implicit invocations of special methods are only
guaranteed to work correctly if defined on an object’s type, not in
the object’s instance dictionary. That behaviour is the reason why
the following code raises an exception:
>>> class C:
... pass
...
>>> c = C()
>>> c.__len__ = lambda: 5
>>> len(c)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: object of type 'C' has no len()
The rationale behind this behaviour lies with a number of special
methods such as "__hash__()" and "__repr__()" that are implemented by
all objects, including type objects. If the implicit lookup of these
methods used the conventional lookup process, they would fail when
invoked on the type object itself:
>>> 1 .__hash__() == hash(1)
True
>>> int.__hash__() == hash(int)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: descriptor '__hash__' of 'int' object needs an argument
Incorrectly attempting to invoke an unbound method of a class in this
way is sometimes referred to as ‘metaclass confusion’, and is avoided
by bypassing the instance when looking up special methods:
>>> type(1).__hash__(1) == hash(1)
True
>>> type(int).__hash__(int) == hash(int)
True
In addition to bypassing any instance attributes in the interest of
correctness, implicit special method lookup generally also bypasses
the "__getattribute__()" method even of the object’s metaclass:
>>> class Meta(type):
... def __getattribute__(*args):
... print("Metaclass getattribute invoked")
... return type.__getattribute__(*args)
...
>>> class C(object, metaclass=Meta):
... def __len__(self):
... return 10
... def __getattribute__(*args):
... print("Class getattribute invoked")
... return object.__getattribute__(*args)
...
>>> c = C()
>>> c.__len__() # Explicit lookup via instance
Class getattribute invoked
10
>>> type(c).__len__(c) # Explicit lookup via type
Metaclass getattribute invoked
10
>>> len(c) # Implicit lookup
10
Bypassing the "__getattribute__()" machinery in this fashion provides
significant scope for speed optimisations within the interpreter, at
the cost of some flexibility in the handling of special methods (the
special method *must* be set on the class object itself in order to be
consistently invoked by the interpreter).
u�Y String Methods
**************
Strings implement all of the common sequence operations, along with
the additional methods described below.
Strings also support two styles of string formatting, one providing a
large degree of flexibility and customization (see "str.format()",
Format String Syntax and Custom String Formatting) and the other based
on C "printf" style formatting that handles a narrower range of types
and is slightly harder to use correctly, but is often faster for the
cases it can handle (printf-style String Formatting).
The Text Processing Services section of the standard library covers a
number of other modules that provide various text related utilities
(including regular expression support in the "re" module).
str.capitalize()
Return a copy of the string with its first character capitalized
and the rest lowercased.
Changed in version 3.8: The first character is now put into
titlecase rather than uppercase. This means that characters like
digraphs will only have their first letter capitalized, instead of
the full character.
str.casefold()
Return a casefolded copy of the string. Casefolded strings may be
used for caseless matching.
Casefolding is similar to lowercasing but more aggressive because
it is intended to remove all case distinctions in a string. For
example, the German lowercase letter "'ß'" is equivalent to ""ss"".
Since it is already lowercase, "lower()" would do nothing to "'ß'";
"casefold()" converts it to ""ss"".
The casefolding algorithm is described in section 3.13 of the
Unicode Standard.
New in version 3.3.
str.center(width[, fillchar])
Return centered in a string of length *width*. Padding is done
using the specified *fillchar* (default is an ASCII space). The
original string is returned if *width* is less than or equal to
"len(s)".
str.count(sub[, start[, end]])
Return the number of non-overlapping occurrences of substring *sub*
in the range [*start*, *end*]. Optional arguments *start* and
*end* are interpreted as in slice notation.
str.encode(encoding="utf-8", errors="strict")
Return an encoded version of the string as a bytes object. Default
encoding is "'utf-8'". *errors* may be given to set a different
error handling scheme. The default for *errors* is "'strict'",
meaning that encoding errors raise a "UnicodeError". Other possible
values are "'ignore'", "'replace'", "'xmlcharrefreplace'",
"'backslashreplace'" and any other name registered via
"codecs.register_error()", see section Error Handlers. For a list
of possible encodings, see section Standard Encodings.
Changed in version 3.1: Support for keyword arguments added.
str.endswith(suffix[, start[, end]])
Return "True" if the string ends with the specified *suffix*,
otherwise return "False". *suffix* can also be a tuple of suffixes
to look for. With optional *start*, test beginning at that
position. With optional *end*, stop comparing at that position.
str.expandtabs(tabsize=8)
Return a copy of the string where all tab characters are replaced
by one or more spaces, depending on the current column and the
given tab size. Tab positions occur every *tabsize* characters
(default is 8, giving tab positions at columns 0, 8, 16 and so on).
To expand the string, the current column is set to zero and the
string is examined character by character. If the character is a
tab ("\t"), one or more space characters are inserted in the result
until the current column is equal to the next tab position. (The
tab character itself is not copied.) If the character is a newline
("\n") or return ("\r"), it is copied and the current column is
reset to zero. Any other character is copied unchanged and the
current column is incremented by one regardless of how the
character is represented when printed.
>>> '01\t012\t0123\t01234'.expandtabs()
'01 012 0123 01234'
>>> '01\t012\t0123\t01234'.expandtabs(4)
'01 012 0123 01234'
str.find(sub[, start[, end]])
Return the lowest index in the string where substring *sub* is
found within the slice "s[start:end]". Optional arguments *start*
and *end* are interpreted as in slice notation. Return "-1" if
*sub* is not found.
Note:
The "find()" method should be used only if you need to know the
position of *sub*. To check if *sub* is a substring or not, use
the "in" operator:
>>> 'Py' in 'Python'
True
str.format(*args, **kwargs)
Perform a string formatting operation. The string on which this
method is called can contain literal text or replacement fields
delimited by braces "{}". Each replacement field contains either
the numeric index of a positional argument, or the name of a
keyword argument. Returns a copy of the string where each
replacement field is replaced with the string value of the
corresponding argument.
>>> "The sum of 1 + 2 is {0}".format(1+2)
'The sum of 1 + 2 is 3'
See Format String Syntax for a description of the various
formatting options that can be specified in format strings.
Note:
When formatting a number ("int", "float", "complex",
"decimal.Decimal" and subclasses) with the "n" type (ex:
"'{:n}'.format(1234)"), the function temporarily sets the
"LC_CTYPE" locale to the "LC_NUMERIC" locale to decode
"decimal_point" and "thousands_sep" fields of "localeconv()" if
they are non-ASCII or longer than 1 byte, and the "LC_NUMERIC"
locale is different than the "LC_CTYPE" locale. This temporary
change affects other threads.
Changed in version 3.7: When formatting a number with the "n" type,
the function sets temporarily the "LC_CTYPE" locale to the
"LC_NUMERIC" locale in some cases.
str.format_map(mapping)
Similar to "str.format(**mapping)", except that "mapping" is used
directly and not copied to a "dict". This is useful if for example
"mapping" is a dict subclass:
>>> class Default(dict):
... def __missing__(self, key):
... return key
...
>>> '{name} was born in {country}'.format_map(Default(name='Guido'))
'Guido was born in country'
New in version 3.2.
str.index(sub[, start[, end]])
Like "find()", but raise "ValueError" when the substring is not
found.
str.isalnum()
Return "True" if all characters in the string are alphanumeric and
there is at least one character, "False" otherwise. A character
"c" is alphanumeric if one of the following returns "True":
"c.isalpha()", "c.isdecimal()", "c.isdigit()", or "c.isnumeric()".
str.isalpha()
Return "True" if all characters in the string are alphabetic and
there is at least one character, "False" otherwise. Alphabetic
characters are those characters defined in the Unicode character
database as “Letter”, i.e., those with general category property
being one of “Lm”, “Lt”, “Lu”, “Ll”, or “Lo”. Note that this is
different from the “Alphabetic” property defined in the Unicode
Standard.
str.isascii()
Return "True" if the string is empty or all characters in the
string are ASCII, "False" otherwise. ASCII characters have code
points in the range U+0000-U+007F.
New in version 3.7.
str.isdecimal()
Return "True" if all characters in the string are decimal
characters and there is at least one character, "False" otherwise.
Decimal characters are those that can be used to form numbers in
base 10, e.g. U+0660, ARABIC-INDIC DIGIT ZERO. Formally a decimal
character is a character in the Unicode General Category “Nd”.
str.isdigit()
Return "True" if all characters in the string are digits and there
is at least one character, "False" otherwise. Digits include
decimal characters and digits that need special handling, such as
the compatibility superscript digits. This covers digits which
cannot be used to form numbers in base 10, like the Kharosthi
numbers. Formally, a digit is a character that has the property
value Numeric_Type=Digit or Numeric_Type=Decimal.
str.isidentifier()
Return "True" if the string is a valid identifier according to the
language definition, section Identifiers and keywords.
Call "keyword.iskeyword()" to test whether string "s" is a reserved
identifier, such as "def" and "class".
Example:
>>> from keyword import iskeyword
>>> 'hello'.isidentifier(), iskeyword('hello')
True, False
>>> 'def'.isidentifier(), iskeyword('def')
True, True
str.islower()
Return "True" if all cased characters [4] in the string are
lowercase and there is at least one cased character, "False"
otherwise.
str.isnumeric()
Return "True" if all characters in the string are numeric
characters, and there is at least one character, "False" otherwise.
Numeric characters include digit characters, and all characters
that have the Unicode numeric value property, e.g. U+2155, VULGAR
FRACTION ONE FIFTH. Formally, numeric characters are those with
the property value Numeric_Type=Digit, Numeric_Type=Decimal or
Numeric_Type=Numeric.
str.isprintable()
Return "True" if all characters in the string are printable or the
string is empty, "False" otherwise. Nonprintable characters are
those characters defined in the Unicode character database as
“Other” or “Separator”, excepting the ASCII space (0x20) which is
considered printable. (Note that printable characters in this
context are those which should not be escaped when "repr()" is
invoked on a string. It has no bearing on the handling of strings
written to "sys.stdout" or "sys.stderr".)
str.isspace()
Return "True" if there are only whitespace characters in the string
and there is at least one character, "False" otherwise.
A character is *whitespace* if in the Unicode character database
(see "unicodedata"), either its general category is "Zs"
(“Separator, space”), or its bidirectional class is one of "WS",
"B", or "S".
str.istitle()
Return "True" if the string is a titlecased string and there is at
least one character, for example uppercase characters may only
follow uncased characters and lowercase characters only cased ones.
Return "False" otherwise.
str.isupper()
Return "True" if all cased characters [4] in the string are
uppercase and there is at least one cased character, "False"
otherwise.
str.join(iterable)
Return a string which is the concatenation of the strings in
*iterable*. A "TypeError" will be raised if there are any non-
string values in *iterable*, including "bytes" objects. The
separator between elements is the string providing this method.
str.ljust(width[, fillchar])
Return the string left justified in a string of length *width*.
Padding is done using the specified *fillchar* (default is an ASCII
space). The original string is returned if *width* is less than or
equal to "len(s)".
str.lower()
Return a copy of the string with all the cased characters [4]
converted to lowercase.
The lowercasing algorithm used is described in section 3.13 of the
Unicode Standard.
str.lstrip([chars])
Return a copy of the string with leading characters removed. The
*chars* argument is a string specifying the set of characters to be
removed. If omitted or "None", the *chars* argument defaults to
removing whitespace. The *chars* argument is not a prefix; rather,
all combinations of its values are stripped:
>>> ' spacious '.lstrip()
'spacious '
>>> 'www.example.com'.lstrip('cmowz.')
'example.com'
static str.maketrans(x[, y[, z]])
This static method returns a translation table usable for
"str.translate()".
If there is only one argument, it must be a dictionary mapping
Unicode ordinals (integers) or characters (strings of length 1) to
Unicode ordinals, strings (of arbitrary lengths) or "None".
Character keys will then be converted to ordinals.
If there are two arguments, they must be strings of equal length,
and in the resulting dictionary, each character in x will be mapped
to the character at the same position in y. If there is a third
argument, it must be a string, whose characters will be mapped to
"None" in the result.
str.partition(sep)
Split the string at the first occurrence of *sep*, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator. If the separator is not
found, return a 3-tuple containing the string itself, followed by
two empty strings.
str.replace(old, new[, count])
Return a copy of the string with all occurrences of substring *old*
replaced by *new*. If the optional argument *count* is given, only
the first *count* occurrences are replaced.
str.rfind(sub[, start[, end]])
Return the highest index in the string where substring *sub* is
found, such that *sub* is contained within "s[start:end]".
Optional arguments *start* and *end* are interpreted as in slice
notation. Return "-1" on failure.
str.rindex(sub[, start[, end]])
Like "rfind()" but raises "ValueError" when the substring *sub* is
not found.
str.rjust(width[, fillchar])
Return the string right justified in a string of length *width*.
Padding is done using the specified *fillchar* (default is an ASCII
space). The original string is returned if *width* is less than or
equal to "len(s)".
str.rpartition(sep)
Split the string at the last occurrence of *sep*, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator. If the separator is not
found, return a 3-tuple containing two empty strings, followed by
the string itself.
str.rsplit(sep=None, maxsplit=-1)
Return a list of the words in the string, using *sep* as the
delimiter string. If *maxsplit* is given, at most *maxsplit* splits
are done, the *rightmost* ones. If *sep* is not specified or
"None", any whitespace string is a separator. Except for splitting
from the right, "rsplit()" behaves like "split()" which is
described in detail below.
str.rstrip([chars])
Return a copy of the string with trailing characters removed. The
*chars* argument is a string specifying the set of characters to be
removed. If omitted or "None", the *chars* argument defaults to
removing whitespace. The *chars* argument is not a suffix; rather,
all combinations of its values are stripped:
>>> ' spacious '.rstrip()
' spacious'
>>> 'mississippi'.rstrip('ipz')
'mississ'
str.split(sep=None, maxsplit=-1)
Return a list of the words in the string, using *sep* as the
delimiter string. If *maxsplit* is given, at most *maxsplit*
splits are done (thus, the list will have at most "maxsplit+1"
elements). If *maxsplit* is not specified or "-1", then there is
no limit on the number of splits (all possible splits are made).
If *sep* is given, consecutive delimiters are not grouped together
and are deemed to delimit empty strings (for example,
"'1,,2'.split(',')" returns "['1', '', '2']"). The *sep* argument
may consist of multiple characters (for example,
"'1<>2<>3'.split('<>')" returns "['1', '2', '3']"). Splitting an
empty string with a specified separator returns "['']".
For example:
>>> '1,2,3'.split(',')
['1', '2', '3']
>>> '1,2,3'.split(',', maxsplit=1)
['1', '2,3']
>>> '1,2,,3,'.split(',')
['1', '2', '', '3', '']
If *sep* is not specified or is "None", a different splitting
algorithm is applied: runs of consecutive whitespace are regarded
as a single separator, and the result will contain no empty strings
at the start or end if the string has leading or trailing
whitespace. Consequently, splitting an empty string or a string
consisting of just whitespace with a "None" separator returns "[]".
For example:
>>> '1 2 3'.split()
['1', '2', '3']
>>> '1 2 3'.split(maxsplit=1)
['1', '2 3']
>>> ' 1 2 3 '.split()
['1', '2', '3']
str.splitlines([keepends])
Return a list of the lines in the string, breaking at line
boundaries. Line breaks are not included in the resulting list
unless *keepends* is given and true.
This method splits on the following line boundaries. In
particular, the boundaries are a superset of *universal newlines*.
+-------------------------+-------------------------------+
| Representation | Description |
|=========================|===============================|
| "\n" | Line Feed |
+-------------------------+-------------------------------+
| "\r" | Carriage Return |
+-------------------------+-------------------------------+
| "\r\n" | Carriage Return + Line Feed |
+-------------------------+-------------------------------+
| "\v" or "\x0b" | Line Tabulation |
+-------------------------+-------------------------------+
| "\f" or "\x0c" | Form Feed |
+-------------------------+-------------------------------+
| "\x1c" | File Separator |
+-------------------------+-------------------------------+
| "\x1d" | Group Separator |
+-------------------------+-------------------------------+
| "\x1e" | Record Separator |
+-------------------------+-------------------------------+
| "\x85" | Next Line (C1 Control Code) |
+-------------------------+-------------------------------+
| "\u2028" | Line Separator |
+-------------------------+-------------------------------+
| "\u2029" | Paragraph Separator |
+-------------------------+-------------------------------+
Changed in version 3.2: "\v" and "\f" added to list of line
boundaries.
For example:
>>> 'ab c\n\nde fg\rkl\r\n'.splitlines()
['ab c', '', 'de fg', 'kl']
>>> 'ab c\n\nde fg\rkl\r\n'.splitlines(keepends=True)
['ab c\n', '\n', 'de fg\r', 'kl\r\n']
Unlike "split()" when a delimiter string *sep* is given, this
method returns an empty list for the empty string, and a terminal
line break does not result in an extra line:
>>> "".splitlines()
[]
>>> "One line\n".splitlines()
['One line']
For comparison, "split('\n')" gives:
>>> ''.split('\n')
['']
>>> 'Two lines\n'.split('\n')
['Two lines', '']
str.startswith(prefix[, start[, end]])
Return "True" if string starts with the *prefix*, otherwise return
"False". *prefix* can also be a tuple of prefixes to look for.
With optional *start*, test string beginning at that position.
With optional *end*, stop comparing string at that position.
str.strip([chars])
Return a copy of the string with the leading and trailing
characters removed. The *chars* argument is a string specifying the
set of characters to be removed. If omitted or "None", the *chars*
argument defaults to removing whitespace. The *chars* argument is
not a prefix or suffix; rather, all combinations of its values are
stripped:
>>> ' spacious '.strip()
'spacious'
>>> 'www.example.com'.strip('cmowz.')
'example'
The outermost leading and trailing *chars* argument values are
stripped from the string. Characters are removed from the leading
end until reaching a string character that is not contained in the
set of characters in *chars*. A similar action takes place on the
trailing end. For example:
>>> comment_string = '#....... Section 3.2.1 Issue #32 .......'
>>> comment_string.strip('.#! ')
'Section 3.2.1 Issue #32'
str.swapcase()
Return a copy of the string with uppercase characters converted to
lowercase and vice versa. Note that it is not necessarily true that
"s.swapcase().swapcase() == s".
str.title()
Return a titlecased version of the string where words start with an
uppercase character and the remaining characters are lowercase.
For example:
>>> 'Hello world'.title()
'Hello World'
The algorithm uses a simple language-independent definition of a
word as groups of consecutive letters. The definition works in
many contexts but it means that apostrophes in contractions and
possessives form word boundaries, which may not be the desired
result:
>>> "they're bill's friends from the UK".title()
"They'Re Bill'S Friends From The Uk"
A workaround for apostrophes can be constructed using regular
expressions:
>>> import re
>>> def titlecase(s):
... return re.sub(r"[A-Za-z]+('[A-Za-z]+)?",
... lambda mo: mo.group(0).capitalize(),
... s)
...
>>> titlecase("they're bill's friends.")
"They're Bill's Friends."
str.translate(table)
Return a copy of the string in which each character has been mapped
through the given translation table. The table must be an object
that implements indexing via "__getitem__()", typically a *mapping*
or *sequence*. When indexed by a Unicode ordinal (an integer), the
table object can do any of the following: return a Unicode ordinal
or a string, to map the character to one or more other characters;
return "None", to delete the character from the return string; or
raise a "LookupError" exception, to map the character to itself.
You can use "str.maketrans()" to create a translation map from
character-to-character mappings in different formats.
See also the "codecs" module for a more flexible approach to custom
character mappings.
str.upper()
Return a copy of the string with all the cased characters [4]
converted to uppercase. Note that "s.upper().isupper()" might be
"False" if "s" contains uncased characters or if the Unicode
category of the resulting character(s) is not “Lu” (Letter,
uppercase), but e.g. “Lt” (Letter, titlecase).
The uppercasing algorithm used is described in section 3.13 of the
Unicode Standard.
str.zfill(width)
Return a copy of the string left filled with ASCII "'0'" digits to
make a string of length *width*. A leading sign prefix
("'+'"/"'-'") is handled by inserting the padding *after* the sign
character rather than before. The original string is returned if
*width* is less than or equal to "len(s)".
For example:
>>> "42".zfill(5)
'00042'
>>> "-42".zfill(5)
'-0042'
u� String and Bytes literals
*************************
String literals are described by the following lexical definitions:
stringliteral ::= [stringprefix](shortstring | longstring)
stringprefix ::= "r" | "u" | "R" | "U" | "f" | "F"
| "fr" | "Fr" | "fR" | "FR" | "rf" | "rF" | "Rf" | "RF"
shortstring ::= "'" shortstringitem* "'" | '"' shortstringitem* '"'
longstring ::= "'''" longstringitem* "'''" | '"""' longstringitem* '"""'
shortstringitem ::= shortstringchar | stringescapeseq
longstringitem ::= longstringchar | stringescapeseq
shortstringchar ::= <any source character except "\" or newline or the quote>
longstringchar ::= <any source character except "\">
stringescapeseq ::= "\" <any source character>
bytesliteral ::= bytesprefix(shortbytes | longbytes)
bytesprefix ::= "b" | "B" | "br" | "Br" | "bR" | "BR" | "rb" | "rB" | "Rb" | "RB"
shortbytes ::= "'" shortbytesitem* "'" | '"' shortbytesitem* '"'
longbytes ::= "'''" longbytesitem* "'''" | '"""' longbytesitem* '"""'
shortbytesitem ::= shortbyteschar | bytesescapeseq
longbytesitem ::= longbyteschar | bytesescapeseq
shortbyteschar ::= <any ASCII character except "\" or newline or the quote>
longbyteschar ::= <any ASCII character except "\">
bytesescapeseq ::= "\" <any ASCII character>
One syntactic restriction not indicated by these productions is that
whitespace is not allowed between the "stringprefix" or "bytesprefix"
and the rest of the literal. The source character set is defined by
the encoding declaration; it is UTF-8 if no encoding declaration is
given in the source file; see section Encoding declarations.
In plain English: Both types of literals can be enclosed in matching
single quotes ("'") or double quotes ("""). They can also be enclosed
in matching groups of three single or double quotes (these are
generally referred to as *triple-quoted strings*). The backslash
("\") character is used to escape characters that otherwise have a
special meaning, such as newline, backslash itself, or the quote
character.
Bytes literals are always prefixed with "'b'" or "'B'"; they produce
an instance of the "bytes" type instead of the "str" type. They may
only contain ASCII characters; bytes with a numeric value of 128 or
greater must be expressed with escapes.
Both string and bytes literals may optionally be prefixed with a
letter "'r'" or "'R'"; such strings are called *raw strings* and treat
backslashes as literal characters. As a result, in string literals,
"'\U'" and "'\u'" escapes in raw strings are not treated specially.
Given that Python 2.x’s raw unicode literals behave differently than
Python 3.x’s the "'ur'" syntax is not supported.
New in version 3.3: The "'rb'" prefix of raw bytes literals has been
added as a synonym of "'br'".
New in version 3.3: Support for the unicode legacy literal
("u'value'") was reintroduced to simplify the maintenance of dual
Python 2.x and 3.x codebases. See **PEP 414** for more information.
A string literal with "'f'" or "'F'" in its prefix is a *formatted
string literal*; see Formatted string literals. The "'f'" may be
combined with "'r'", but not with "'b'" or "'u'", therefore raw
formatted strings are possible, but formatted bytes literals are not.
In triple-quoted literals, unescaped newlines and quotes are allowed
(and are retained), except that three unescaped quotes in a row
terminate the literal. (A “quote” is the character used to open the
literal, i.e. either "'" or """.)
Unless an "'r'" or "'R'" prefix is present, escape sequences in string
and bytes literals are interpreted according to rules similar to those
used by Standard C. The recognized escape sequences are:
+-------------------+-----------------------------------+---------+
| Escape Sequence | Meaning | Notes |
|===================|===================================|=========|
| "\newline" | Backslash and newline ignored | |
+-------------------+-----------------------------------+---------+
| "\\" | Backslash ("\") | |
+-------------------+-----------------------------------+---------+
| "\'" | Single quote ("'") | |
+-------------------+-----------------------------------+---------+
| "\"" | Double quote (""") | |
+-------------------+-----------------------------------+---------+
| "\a" | ASCII Bell (BEL) | |
+-------------------+-----------------------------------+---------+
| "\b" | ASCII Backspace (BS) | |
+-------------------+-----------------------------------+---------+
| "\f" | ASCII Formfeed (FF) | |
+-------------------+-----------------------------------+---------+
| "\n" | ASCII Linefeed (LF) | |
+-------------------+-----------------------------------+---------+
| "\r" | ASCII Carriage Return (CR) | |
+-------------------+-----------------------------------+---------+
| "\t" | ASCII Horizontal Tab (TAB) | |
+-------------------+-----------------------------------+---------+
| "\v" | ASCII Vertical Tab (VT) | |
+-------------------+-----------------------------------+---------+
| "\ooo" | Character with octal value *ooo* | (1,3) |
+-------------------+-----------------------------------+---------+
| "\xhh" | Character with hex value *hh* | (2,3) |
+-------------------+-----------------------------------+---------+
Escape sequences only recognized in string literals are:
+-------------------+-----------------------------------+---------+
| Escape Sequence | Meaning | Notes |
|===================|===================================|=========|
| "\N{name}" | Character named *name* in the | (4) |
| | Unicode database | |
+-------------------+-----------------------------------+---------+
| "\uxxxx" | Character with 16-bit hex value | (5) |
| | *xxxx* | |
+-------------------+-----------------------------------+---------+
| "\Uxxxxxxxx" | Character with 32-bit hex value | (6) |
| | *xxxxxxxx* | |
+-------------------+-----------------------------------+---------+
Notes:
1. As in Standard C, up to three octal digits are accepted.
2. Unlike in Standard C, exactly two hex digits are required.
3. In a bytes literal, hexadecimal and octal escapes denote the byte
with the given value. In a string literal, these escapes denote a
Unicode character with the given value.
4. Changed in version 3.3: Support for name aliases [1] has been
added.
5. Exactly four hex digits are required.
6. Any Unicode character can be encoded this way. Exactly eight hex
digits are required.
Unlike Standard C, all unrecognized escape sequences are left in the
string unchanged, i.e., *the backslash is left in the result*. (This
behavior is useful when debugging: if an escape sequence is mistyped,
the resulting output is more easily recognized as broken.) It is also
important to note that the escape sequences only recognized in string
literals fall into the category of unrecognized escapes for bytes
literals.
Changed in version 3.6: Unrecognized escape sequences produce a
"DeprecationWarning". In a future Python version they will be a
"SyntaxWarning" and eventually a "SyntaxError".
Even in a raw literal, quotes can be escaped with a backslash, but the
backslash remains in the result; for example, "r"\""" is a valid
string literal consisting of two characters: a backslash and a double
quote; "r"\"" is not a valid string literal (even a raw string cannot
end in an odd number of backslashes). Specifically, *a raw literal
cannot end in a single backslash* (since the backslash would escape
the following quote character). Note also that a single backslash
followed by a newline is interpreted as those two characters as part
of the literal, *not* as a line continuation.
uM Subscriptions
*************
A subscription selects an item of a sequence (string, tuple or list)
or mapping (dictionary) object:
subscription ::= primary "[" expression_list "]"
The primary must evaluate to an object that supports subscription
(lists or dictionaries for example). User-defined objects can support
subscription by defining a "__getitem__()" method.
For built-in objects, there are two types of objects that support
subscription:
If the primary is a mapping, the expression list must evaluate to an
object whose value is one of the keys of the mapping, and the
subscription selects the value in the mapping that corresponds to that
key. (The expression list is a tuple except if it has exactly one
item.)
If the primary is a sequence, the expression list must evaluate to an
integer or a slice (as discussed in the following section).
The formal syntax makes no special provision for negative indices in
sequences; however, built-in sequences all provide a "__getitem__()"
method that interprets negative indices by adding the length of the
sequence to the index (so that "x[-1]" selects the last item of "x").
The resulting value must be a nonnegative integer less than the number
of items in the sequence, and the subscription selects the item whose
index is that value (counting from zero). Since the support for
negative indices and slicing occurs in the object’s "__getitem__()"
method, subclasses overriding this method will need to explicitly add
that support.
A string’s items are characters. A character is not a separate data
type but a string of exactly one character.
ax Truth Value Testing
*******************
Any object can be tested for truth value, for use in an "if" or
"while" condition or as operand of the Boolean operations below.
By default, an object is considered true unless its class defines
either a "__bool__()" method that returns "False" or a "__len__()"
method that returns zero, when called with the object. [1] Here are
most of the built-in objects considered false:
* constants defined to be false: "None" and "False".
* zero of any numeric type: "0", "0.0", "0j", "Decimal(0)",
"Fraction(0, 1)"
* empty sequences and collections: "''", "()", "[]", "{}", "set()",
"range(0)"
Operations and built-in functions that have a Boolean result always
return "0" or "False" for false and "1" or "True" for true, unless
otherwise stated. (Important exception: the Boolean operations "or"
and "and" always return one of their operands.)
uR The "try" statement
*******************
The "try" statement specifies exception handlers and/or cleanup code
for a group of statements:
try_stmt ::= try1_stmt | try2_stmt
try1_stmt ::= "try" ":" suite
("except" [expression ["as" identifier]] ":" suite)+
["else" ":" suite]
["finally" ":" suite]
try2_stmt ::= "try" ":" suite
"finally" ":" suite
The "except" clause(s) specify one or more exception handlers. When no
exception occurs in the "try" clause, no exception handler is
executed. When an exception occurs in the "try" suite, a search for an
exception handler is started. This search inspects the except clauses
in turn until one is found that matches the exception. An expression-
less except clause, if present, must be last; it matches any
exception. For an except clause with an expression, that expression
is evaluated, and the clause matches the exception if the resulting
object is “compatible” with the exception. An object is compatible
with an exception if it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base
class of the exception object.
If no except clause matches the exception, the search for an exception
handler continues in the surrounding code and on the invocation stack.
[1]
If the evaluation of an expression in the header of an except clause
raises an exception, the original search for a handler is canceled and
a search starts for the new exception in the surrounding code and on
the call stack (it is treated as if the entire "try" statement raised
the exception).
When a matching except clause is found, the exception is assigned to
the target specified after the "as" keyword in that except clause, if
present, and the except clause’s suite is executed. All except
clauses must have an executable block. When the end of this block is
reached, execution continues normally after the entire try statement.
(This means that if two nested handlers exist for the same exception,
and the exception occurs in the try clause of the inner handler, the
outer handler will not handle the exception.)
When an exception has been assigned using "as target", it is cleared
at the end of the except clause. This is as if
except E as N:
foo
was translated to
except E as N:
try:
foo
finally:
del N
This means the exception must be assigned to a different name to be
able to refer to it after the except clause. Exceptions are cleared
because with the traceback attached to them, they form a reference
cycle with the stack frame, keeping all locals in that frame alive
until the next garbage collection occurs.
Before an except clause’s suite is executed, details about the
exception are stored in the "sys" module and can be accessed via
"sys.exc_info()". "sys.exc_info()" returns a 3-tuple consisting of the
exception class, the exception instance and a traceback object (see
section The standard type hierarchy) identifying the point in the
program where the exception occurred. "sys.exc_info()" values are
restored to their previous values (before the call) when returning
from a function that handled an exception.
The optional "else" clause is executed if the control flow leaves the
"try" suite, no exception was raised, and no "return", "continue", or
"break" statement was executed. Exceptions in the "else" clause are
not handled by the preceding "except" clauses.
If "finally" is present, it specifies a ‘cleanup’ handler. The "try"
clause is executed, including any "except" and "else" clauses. If an
exception occurs in any of the clauses and is not handled, the
exception is temporarily saved. The "finally" clause is executed. If
there is a saved exception it is re-raised at the end of the "finally"
clause. If the "finally" clause raises another exception, the saved
exception is set as the context of the new exception. If the "finally"
clause executes a "return", "break" or "continue" statement, the saved
exception is discarded:
>>> def f():
... try:
... 1/0
... finally:
... return 42
...
>>> f()
42
The exception information is not available to the program during
execution of the "finally" clause.
When a "return", "break" or "continue" statement is executed in the
"try" suite of a "try"…"finally" statement, the "finally" clause is
also executed ‘on the way out.’
The return value of a function is determined by the last "return"
statement executed. Since the "finally" clause always executes, a
"return" statement executed in the "finally" clause will always be the
last one executed:
>>> def foo():
... try:
... return 'try'
... finally:
... return 'finally'
...
>>> foo()
'finally'
Additional information on exceptions can be found in section
Exceptions, and information on using the "raise" statement to generate
exceptions may be found in section The raise statement.
Changed in version 3.8: Prior to Python 3.8, a "continue" statement
was illegal in the "finally" clause due to a problem with the
implementation.
ux� The standard type hierarchy
***************************
Below is a list of the types that are built into Python. Extension
modules (written in C, Java, or other languages, depending on the
implementation) can define additional types. Future versions of
Python may add types to the type hierarchy (e.g., rational numbers,
efficiently stored arrays of integers, etc.), although such additions
will often be provided via the standard library instead.
Some of the type descriptions below contain a paragraph listing
‘special attributes.’ These are attributes that provide access to the
implementation and are not intended for general use. Their definition
may change in the future.
None
This type has a single value. There is a single object with this
value. This object is accessed through the built-in name "None". It
is used to signify the absence of a value in many situations, e.g.,
it is returned from functions that don’t explicitly return
anything. Its truth value is false.
NotImplemented
This type has a single value. There is a single object with this
value. This object is accessed through the built-in name
"NotImplemented". Numeric methods and rich comparison methods
should return this value if they do not implement the operation for
the operands provided. (The interpreter will then try the
reflected operation, or some other fallback, depending on the
operator.) Its truth value is true.
See Implementing the arithmetic operations for more details.
Ellipsis
This type has a single value. There is a single object with this
value. This object is accessed through the literal "..." or the
built-in name "Ellipsis". Its truth value is true.
"numbers.Number"
These are created by numeric literals and returned as results by
arithmetic operators and arithmetic built-in functions. Numeric
objects are immutable; once created their value never changes.
Python numbers are of course strongly related to mathematical
numbers, but subject to the limitations of numerical representation
in computers.
The string representations of the numeric classes, computed by
"__repr__()" and "__str__()", have the following properties:
* They are valid numeric literals which, when passed to their class
constructor, produce an object having the value of the original
numeric.
* The representation is in base 10, when possible.
* Leading zeros, possibly excepting a single zero before a decimal
point, are not shown.
* Trailing zeros, possibly excepting a single zero after a decimal
point, are not shown.
* A sign is shown only when the number is negative.
Python distinguishes between integers, floating point numbers, and
complex numbers:
"numbers.Integral"
These represent elements from the mathematical set of integers
(positive and negative).
There are two types of integers:
Integers ("int")
These represent numbers in an unlimited range, subject to
available (virtual) memory only. For the purpose of shift
and mask operations, a binary representation is assumed, and
negative numbers are represented in a variant of 2’s
complement which gives the illusion of an infinite string of
sign bits extending to the left.
Booleans ("bool")
These represent the truth values False and True. The two
objects representing the values "False" and "True" are the
only Boolean objects. The Boolean type is a subtype of the
integer type, and Boolean values behave like the values 0 and
1, respectively, in almost all contexts, the exception being
that when converted to a string, the strings ""False"" or
""True"" are returned, respectively.
The rules for integer representation are intended to give the
most meaningful interpretation of shift and mask operations
involving negative integers.
"numbers.Real" ("float")
These represent machine-level double precision floating point
numbers. You are at the mercy of the underlying machine
architecture (and C or Java implementation) for the accepted
range and handling of overflow. Python does not support single-
precision floating point numbers; the savings in processor and
memory usage that are usually the reason for using these are
dwarfed by the overhead of using objects in Python, so there is
no reason to complicate the language with two kinds of floating
point numbers.
"numbers.Complex" ("complex")
These represent complex numbers as a pair of machine-level
double precision floating point numbers. The same caveats apply
as for floating point numbers. The real and imaginary parts of a
complex number "z" can be retrieved through the read-only
attributes "z.real" and "z.imag".
Sequences
These represent finite ordered sets indexed by non-negative
numbers. The built-in function "len()" returns the number of items
of a sequence. When the length of a sequence is *n*, the index set
contains the numbers 0, 1, …, *n*-1. Item *i* of sequence *a* is
selected by "a[i]".
Sequences also support slicing: "a[i:j]" selects all items with
index *k* such that *i* "<=" *k* "<" *j*. When used as an
expression, a slice is a sequence of the same type. This implies
that the index set is renumbered so that it starts at 0.
Some sequences also support “extended slicing” with a third “step”
parameter: "a[i:j:k]" selects all items of *a* with index *x* where
"x = i + n*k", *n* ">=" "0" and *i* "<=" *x* "<" *j*.
Sequences are distinguished according to their mutability:
Immutable sequences
An object of an immutable sequence type cannot change once it is
created. (If the object contains references to other objects,
these other objects may be mutable and may be changed; however,
the collection of objects directly referenced by an immutable
object cannot change.)
The following types are immutable sequences:
Strings
A string is a sequence of values that represent Unicode code
points. All the code points in the range "U+0000 - U+10FFFF"
can be represented in a string. Python doesn’t have a "char"
type; instead, every code point in the string is represented
as a string object with length "1". The built-in function
"ord()" converts a code point from its string form to an
integer in the range "0 - 10FFFF"; "chr()" converts an
integer in the range "0 - 10FFFF" to the corresponding length
"1" string object. "str.encode()" can be used to convert a
"str" to "bytes" using the given text encoding, and
"bytes.decode()" can be used to achieve the opposite.
Tuples
The items of a tuple are arbitrary Python objects. Tuples of
two or more items are formed by comma-separated lists of
expressions. A tuple of one item (a ‘singleton’) can be
formed by affixing a comma to an expression (an expression by
itself does not create a tuple, since parentheses must be
usable for grouping of expressions). An empty tuple can be
formed by an empty pair of parentheses.
Bytes
A bytes object is an immutable array. The items are 8-bit
bytes, represented by integers in the range 0 <= x < 256.
Bytes literals (like "b'abc'") and the built-in "bytes()"
constructor can be used to create bytes objects. Also, bytes
objects can be decoded to strings via the "decode()" method.
Mutable sequences
Mutable sequences can be changed after they are created. The
subscription and slicing notations can be used as the target of
assignment and "del" (delete) statements.
There are currently two intrinsic mutable sequence types:
Lists
The items of a list are arbitrary Python objects. Lists are
formed by placing a comma-separated list of expressions in
square brackets. (Note that there are no special cases needed
to form lists of length 0 or 1.)
Byte Arrays
A bytearray object is a mutable array. They are created by
the built-in "bytearray()" constructor. Aside from being
mutable (and hence unhashable), byte arrays otherwise provide
the same interface and functionality as immutable "bytes"
objects.
The extension module "array" provides an additional example of a
mutable sequence type, as does the "collections" module.
Set types
These represent unordered, finite sets of unique, immutable
objects. As such, they cannot be indexed by any subscript. However,
they can be iterated over, and the built-in function "len()"
returns the number of items in a set. Common uses for sets are fast
membership testing, removing duplicates from a sequence, and
computing mathematical operations such as intersection, union,
difference, and symmetric difference.
For set elements, the same immutability rules apply as for
dictionary keys. Note that numeric types obey the normal rules for
numeric comparison: if two numbers compare equal (e.g., "1" and
"1.0"), only one of them can be contained in a set.
There are currently two intrinsic set types:
Sets
These represent a mutable set. They are created by the built-in
"set()" constructor and can be modified afterwards by several
methods, such as "add()".
Frozen sets
These represent an immutable set. They are created by the
built-in "frozenset()" constructor. As a frozenset is immutable
and *hashable*, it can be used again as an element of another
set, or as a dictionary key.
Mappings
These represent finite sets of objects indexed by arbitrary index
sets. The subscript notation "a[k]" selects the item indexed by "k"
from the mapping "a"; this can be used in expressions and as the
target of assignments or "del" statements. The built-in function
"len()" returns the number of items in a mapping.
There is currently a single intrinsic mapping type:
Dictionaries
These represent finite sets of objects indexed by nearly
arbitrary values. The only types of values not acceptable as
keys are values containing lists or dictionaries or other
mutable types that are compared by value rather than by object
identity, the reason being that the efficient implementation of
dictionaries requires a key’s hash value to remain constant.
Numeric types used for keys obey the normal rules for numeric
comparison: if two numbers compare equal (e.g., "1" and "1.0")
then they can be used interchangeably to index the same
dictionary entry.
Dictionaries preserve insertion order, meaning that keys will be
produced in the same order they were added sequentially over the
dictionary. Replacing an existing key does not change the order,
however removing a key and re-inserting it will add it to the
end instead of keeping its old place.
Dictionaries are mutable; they can be created by the "{...}"
notation (see section Dictionary displays).
The extension modules "dbm.ndbm" and "dbm.gnu" provide
additional examples of mapping types, as does the "collections"
module.
Changed in version 3.7: Dictionaries did not preserve insertion
order in versions of Python before 3.6. In CPython 3.6,
insertion order was preserved, but it was considered an
implementation detail at that time rather than a language
guarantee.
Callable types
These are the types to which the function call operation (see
section Calls) can be applied:
User-defined functions
A user-defined function object is created by a function
definition (see section Function definitions). It should be
called with an argument list containing the same number of items
as the function’s formal parameter list.
Special attributes:
+---------------------------+---------------------------------+-------------+
| Attribute | Meaning | |
|===========================|=================================|=============|
| "__doc__" | The function’s documentation | Writable |
| | string, or "None" if | |
| | unavailable; not inherited by | |
| | subclasses. | |
+---------------------------+---------------------------------+-------------+
| "__name__" | The function’s name. | Writable |
+---------------------------+---------------------------------+-------------+
| "__qualname__" | The function’s *qualified | Writable |
| | name*. New in version 3.3. | |
+---------------------------+---------------------------------+-------------+
| "__module__" | The name of the module the | Writable |
| | function was defined in, or | |
| | "None" if unavailable. | |
+---------------------------+---------------------------------+-------------+
| "__defaults__" | A tuple containing default | Writable |
| | argument values for those | |
| | arguments that have defaults, | |
| | or "None" if no arguments have | |
| | a default value. | |
+---------------------------+---------------------------------+-------------+
| "__code__" | The code object representing | Writable |
| | the compiled function body. | |
+---------------------------+---------------------------------+-------------+
| "__globals__" | A reference to the dictionary | Read-only |
| | that holds the function’s | |
| | global variables — the global | |
| | namespace of the module in | |
| | which the function was defined. | |
+---------------------------+---------------------------------+-------------+
| "__dict__" | The namespace supporting | Writable |
| | arbitrary function attributes. | |
+---------------------------+---------------------------------+-------------+
| "__closure__" | "None" or a tuple of cells that | Read-only |
| | contain bindings for the | |
| | function’s free variables. See | |
| | below for information on the | |
| | "cell_contents" attribute. | |
+---------------------------+---------------------------------+-------------+
| "__annotations__" | A dict containing annotations | Writable |
| | of parameters. The keys of the | |
| | dict are the parameter names, | |
| | and "'return'" for the return | |
| | annotation, if provided. | |
+---------------------------+---------------------------------+-------------+
| "__kwdefaults__" | A dict containing defaults for | Writable |
| | keyword-only parameters. | |
+---------------------------+---------------------------------+-------------+
Most of the attributes labelled “Writable” check the type of the
assigned value.
Function objects also support getting and setting arbitrary
attributes, which can be used, for example, to attach metadata
to functions. Regular attribute dot-notation is used to get and
set such attributes. *Note that the current implementation only
supports function attributes on user-defined functions. Function
attributes on built-in functions may be supported in the
future.*
A cell object has the attribute "cell_contents". This can be
used to get the value of the cell, as well as set the value.
Additional information about a function’s definition can be
retrieved from its code object; see the description of internal
types below. The "cell" type can be accessed in the "types"
module.
Instance methods
An instance method object combines a class, a class instance and
any callable object (normally a user-defined function).
Special read-only attributes: "__self__" is the class instance
object, "__func__" is the function object; "__doc__" is the
method’s documentation (same as "__func__.__doc__"); "__name__"
is the method name (same as "__func__.__name__"); "__module__"
is the name of the module the method was defined in, or "None"
if unavailable.
Methods also support accessing (but not setting) the arbitrary
function attributes on the underlying function object.
User-defined method objects may be created when getting an
attribute of a class (perhaps via an instance of that class), if
that attribute is a user-defined function object or a class
method object.
When an instance method object is created by retrieving a user-
defined function object from a class via one of its instances,
its "__self__" attribute is the instance, and the method object
is said to be bound. The new method’s "__func__" attribute is
the original function object.
When an instance method object is created by retrieving a class
method object from a class or instance, its "__self__" attribute
is the class itself, and its "__func__" attribute is the
function object underlying the class method.
When an instance method object is called, the underlying
function ("__func__") is called, inserting the class instance
("__self__") in front of the argument list. For instance, when
"C" is a class which contains a definition for a function "f()",
and "x" is an instance of "C", calling "x.f(1)" is equivalent to
calling "C.f(x, 1)".
When an instance method object is derived from a class method
object, the “class instance” stored in "__self__" will actually
be the class itself, so that calling either "x.f(1)" or "C.f(1)"
is equivalent to calling "f(C,1)" where "f" is the underlying
function.
Note that the transformation from function object to instance
method object happens each time the attribute is retrieved from
the instance. In some cases, a fruitful optimization is to
assign the attribute to a local variable and call that local
variable. Also notice that this transformation only happens for
user-defined functions; other callable objects (and all non-
callable objects) are retrieved without transformation. It is
also important to note that user-defined functions which are
attributes of a class instance are not converted to bound
methods; this *only* happens when the function is an attribute
of the class.
Generator functions
A function or method which uses the "yield" statement (see
section The yield statement) is called a *generator function*.
Such a function, when called, always returns an iterator object
which can be used to execute the body of the function: calling
the iterator’s "iterator.__next__()" method will cause the
function to execute until it provides a value using the "yield"
statement. When the function executes a "return" statement or
falls off the end, a "StopIteration" exception is raised and the
iterator will have reached the end of the set of values to be
returned.
Coroutine functions
A function or method which is defined using "async def" is
called a *coroutine function*. Such a function, when called,
returns a *coroutine* object. It may contain "await"
expressions, as well as "async with" and "async for" statements.
See also the Coroutine Objects section.
Asynchronous generator functions
A function or method which is defined using "async def" and
which uses the "yield" statement is called a *asynchronous
generator function*. Such a function, when called, returns an
asynchronous iterator object which can be used in an "async for"
statement to execute the body of the function.
Calling the asynchronous iterator’s "aiterator.__anext__()"
method will return an *awaitable* which when awaited will
execute until it provides a value using the "yield" expression.
When the function executes an empty "return" statement or falls
off the end, a "StopAsyncIteration" exception is raised and the
asynchronous iterator will have reached the end of the set of
values to be yielded.
Built-in functions
A built-in function object is a wrapper around a C function.
Examples of built-in functions are "len()" and "math.sin()"
("math" is a standard built-in module). The number and type of
the arguments are determined by the C function. Special read-
only attributes: "__doc__" is the function’s documentation
string, or "None" if unavailable; "__name__" is the function’s
name; "__self__" is set to "None" (but see the next item);
"__module__" is the name of the module the function was defined
in or "None" if unavailable.
Built-in methods
This is really a different disguise of a built-in function, this
time containing an object passed to the C function as an
implicit extra argument. An example of a built-in method is
"alist.append()", assuming *alist* is a list object. In this
case, the special read-only attribute "__self__" is set to the
object denoted by *alist*.
Classes
Classes are callable. These objects normally act as factories
for new instances of themselves, but variations are possible for
class types that override "__new__()". The arguments of the
call are passed to "__new__()" and, in the typical case, to
"__init__()" to initialize the new instance.
Class Instances
Instances of arbitrary classes can be made callable by defining
a "__call__()" method in their class.
Modules
Modules are a basic organizational unit of Python code, and are
created by the import system as invoked either by the "import"
statement, or by calling functions such as
"importlib.import_module()" and built-in "__import__()". A module
object has a namespace implemented by a dictionary object (this is
the dictionary referenced by the "__globals__" attribute of
functions defined in the module). Attribute references are
translated to lookups in this dictionary, e.g., "m.x" is equivalent
to "m.__dict__["x"]". A module object does not contain the code
object used to initialize the module (since it isn’t needed once
the initialization is done).
Attribute assignment updates the module’s namespace dictionary,
e.g., "m.x = 1" is equivalent to "m.__dict__["x"] = 1".
Predefined (writable) attributes: "__name__" is the module’s name;
"__doc__" is the module’s documentation string, or "None" if
unavailable; "__annotations__" (optional) is a dictionary
containing *variable annotations* collected during module body
execution; "__file__" is the pathname of the file from which the
module was loaded, if it was loaded from a file. The "__file__"
attribute may be missing for certain types of modules, such as C
modules that are statically linked into the interpreter; for
extension modules loaded dynamically from a shared library, it is
the pathname of the shared library file.
Special read-only attribute: "__dict__" is the module’s namespace
as a dictionary object.
**CPython implementation detail:** Because of the way CPython
clears module dictionaries, the module dictionary will be cleared
when the module falls out of scope even if the dictionary still has
live references. To avoid this, copy the dictionary or keep the
module around while using its dictionary directly.
Custom classes
Custom class types are typically created by class definitions (see
section Class definitions). A class has a namespace implemented by
a dictionary object. Class attribute references are translated to
lookups in this dictionary, e.g., "C.x" is translated to
"C.__dict__["x"]" (although there are a number of hooks which allow
for other means of locating attributes). When the attribute name is
not found there, the attribute search continues in the base
classes. This search of the base classes uses the C3 method
resolution order which behaves correctly even in the presence of
‘diamond’ inheritance structures where there are multiple
inheritance paths leading back to a common ancestor. Additional
details on the C3 MRO used by Python can be found in the
documentation accompanying the 2.3 release at
https://www.python.org/download/releases/2.3/mro/.
When a class attribute reference (for class "C", say) would yield a
class method object, it is transformed into an instance method
object whose "__self__" attribute is "C". When it would yield a
static method object, it is transformed into the object wrapped by
the static method object. See section Implementing Descriptors for
another way in which attributes retrieved from a class may differ
from those actually contained in its "__dict__".
Class attribute assignments update the class’s dictionary, never
the dictionary of a base class.
A class object can be called (see above) to yield a class instance
(see below).
Special attributes: "__name__" is the class name; "__module__" is
the module name in which the class was defined; "__dict__" is the
dictionary containing the class’s namespace; "__bases__" is a tuple
containing the base classes, in the order of their occurrence in
the base class list; "__doc__" is the class’s documentation string,
or "None" if undefined; "__annotations__" (optional) is a
dictionary containing *variable annotations* collected during class
body execution.
Class instances
A class instance is created by calling a class object (see above).
A class instance has a namespace implemented as a dictionary which
is the first place in which attribute references are searched.
When an attribute is not found there, and the instance’s class has
an attribute by that name, the search continues with the class
attributes. If a class attribute is found that is a user-defined
function object, it is transformed into an instance method object
whose "__self__" attribute is the instance. Static method and
class method objects are also transformed; see above under
“Classes”. See section Implementing Descriptors for another way in
which attributes of a class retrieved via its instances may differ
from the objects actually stored in the class’s "__dict__". If no
class attribute is found, and the object’s class has a
"__getattr__()" method, that is called to satisfy the lookup.
Attribute assignments and deletions update the instance’s
dictionary, never a class’s dictionary. If the class has a
"__setattr__()" or "__delattr__()" method, this is called instead
of updating the instance dictionary directly.
Class instances can pretend to be numbers, sequences, or mappings
if they have methods with certain special names. See section
Special method names.
Special attributes: "__dict__" is the attribute dictionary;
"__class__" is the instance’s class.
I/O objects (also known as file objects)
A *file object* represents an open file. Various shortcuts are
available to create file objects: the "open()" built-in function,
and also "os.popen()", "os.fdopen()", and the "makefile()" method
of socket objects (and perhaps by other functions or methods
provided by extension modules).
The objects "sys.stdin", "sys.stdout" and "sys.stderr" are
initialized to file objects corresponding to the interpreter’s
standard input, output and error streams; they are all open in text
mode and therefore follow the interface defined by the
"io.TextIOBase" abstract class.
Internal types
A few types used internally by the interpreter are exposed to the
user. Their definitions may change with future versions of the
interpreter, but they are mentioned here for completeness.
Code objects
Code objects represent *byte-compiled* executable Python code,
or *bytecode*. The difference between a code object and a
function object is that the function object contains an explicit
reference to the function’s globals (the module in which it was
defined), while a code object contains no context; also the
default argument values are stored in the function object, not
in the code object (because they represent values calculated at
run-time). Unlike function objects, code objects are immutable
and contain no references (directly or indirectly) to mutable
objects.
Special read-only attributes: "co_name" gives the function name;
"co_argcount" is the total number of positional arguments
(including positional-only arguments and arguments with default
values); "co_posonlyargcount" is the number of positional-only
arguments (including arguments with default values);
"co_kwonlyargcount" is the number of keyword-only arguments
(including arguments with default values); "co_nlocals" is the
number of local variables used by the function (including
arguments); "co_varnames" is a tuple containing the names of the
local variables (starting with the argument names);
"co_cellvars" is a tuple containing the names of local variables
that are referenced by nested functions; "co_freevars" is a
tuple containing the names of free variables; "co_code" is a
string representing the sequence of bytecode instructions;
"co_consts" is a tuple containing the literals used by the
bytecode; "co_names" is a tuple containing the names used by the
bytecode; "co_filename" is the filename from which the code was
compiled; "co_firstlineno" is the first line number of the
function; "co_lnotab" is a string encoding the mapping from
bytecode offsets to line numbers (for details see the source
code of the interpreter); "co_stacksize" is the required stack
size; "co_flags" is an integer encoding a number of flags for
the interpreter.
The following flag bits are defined for "co_flags": bit "0x04"
is set if the function uses the "*arguments" syntax to accept an
arbitrary number of positional arguments; bit "0x08" is set if
the function uses the "**keywords" syntax to accept arbitrary
keyword arguments; bit "0x20" is set if the function is a
generator.
Future feature declarations ("from __future__ import division")
also use bits in "co_flags" to indicate whether a code object
was compiled with a particular feature enabled: bit "0x2000" is
set if the function was compiled with future division enabled;
bits "0x10" and "0x1000" were used in earlier versions of
Python.
Other bits in "co_flags" are reserved for internal use.
If a code object represents a function, the first item in
"co_consts" is the documentation string of the function, or
"None" if undefined.
Frame objects
Frame objects represent execution frames. They may occur in
traceback objects (see below), and are also passed to registered
trace functions.
Special read-only attributes: "f_back" is to the previous stack
frame (towards the caller), or "None" if this is the bottom
stack frame; "f_code" is the code object being executed in this
frame; "f_locals" is the dictionary used to look up local
variables; "f_globals" is used for global variables;
"f_builtins" is used for built-in (intrinsic) names; "f_lasti"
gives the precise instruction (this is an index into the
bytecode string of the code object).
Accessing "f_code" raises an auditing event "object.__getattr__"
with arguments "obj" and ""f_code"".
Special writable attributes: "f_trace", if not "None", is a
function called for various events during code execution (this
is used by the debugger). Normally an event is triggered for
each new source line - this can be disabled by setting
"f_trace_lines" to "False".
Implementations *may* allow per-opcode events to be requested by
setting "f_trace_opcodes" to "True". Note that this may lead to
undefined interpreter behaviour if exceptions raised by the
trace function escape to the function being traced.
"f_lineno" is the current line number of the frame — writing to
this from within a trace function jumps to the given line (only
for the bottom-most frame). A debugger can implement a Jump
command (aka Set Next Statement) by writing to f_lineno.
Frame objects support one method:
frame.clear()
This method clears all references to local variables held by
the frame. Also, if the frame belonged to a generator, the
generator is finalized. This helps break reference cycles
involving frame objects (for example when catching an
exception and storing its traceback for later use).
"RuntimeError" is raised if the frame is currently executing.
New in version 3.4.
Traceback objects
Traceback objects represent a stack trace of an exception. A
traceback object is implicitly created when an exception occurs,
and may also be explicitly created by calling
"types.TracebackType".
For implicitly created tracebacks, when the search for an
exception handler unwinds the execution stack, at each unwound
level a traceback object is inserted in front of the current
traceback. When an exception handler is entered, the stack
trace is made available to the program. (See section The try
statement.) It is accessible as the third item of the tuple
returned by "sys.exc_info()", and as the "__traceback__"
attribute of the caught exception.
When the program contains no suitable handler, the stack trace
is written (nicely formatted) to the standard error stream; if
the interpreter is interactive, it is also made available to the
user as "sys.last_traceback".
For explicitly created tracebacks, it is up to the creator of
the traceback to determine how the "tb_next" attributes should
be linked to form a full stack trace.
Special read-only attributes: "tb_frame" points to the execution
frame of the current level; "tb_lineno" gives the line number
where the exception occurred; "tb_lasti" indicates the precise
instruction. The line number and last instruction in the
traceback may differ from the line number of its frame object if
the exception occurred in a "try" statement with no matching
except clause or with a finally clause.
Accessing "tb_frame" raises an auditing event
"object.__getattr__" with arguments "obj" and ""tb_frame"".
Special writable attribute: "tb_next" is the next level in the
stack trace (towards the frame where the exception occurred), or
"None" if there is no next level.
Changed in version 3.7: Traceback objects can now be explicitly
instantiated from Python code, and the "tb_next" attribute of
existing instances can be updated.
Slice objects
Slice objects are used to represent slices for "__getitem__()"
methods. They are also created by the built-in "slice()"
function.
Special read-only attributes: "start" is the lower bound; "stop"
is the upper bound; "step" is the step value; each is "None" if
omitted. These attributes can have any type.
Slice objects support one method:
slice.indices(self, length)
This method takes a single integer argument *length* and
computes information about the slice that the slice object
would describe if applied to a sequence of *length* items.
It returns a tuple of three integers; respectively these are
the *start* and *stop* indices and the *step* or stride
length of the slice. Missing or out-of-bounds indices are
handled in a manner consistent with regular slices.
Static method objects
Static method objects provide a way of defeating the
transformation of function objects to method objects described
above. A static method object is a wrapper around any other
object, usually a user-defined method object. When a static
method object is retrieved from a class or a class instance, the
object actually returned is the wrapped object, which is not
subject to any further transformation. Static method objects are
not themselves callable, although the objects they wrap usually
are. Static method objects are created by the built-in
"staticmethod()" constructor.
Class method objects
A class method object, like a static method object, is a wrapper
around another object that alters the way in which that object
is retrieved from classes and class instances. The behaviour of
class method objects upon such retrieval is described above,
under “User-defined methods”. Class method objects are created
by the built-in "classmethod()" constructor.
a� Functions
*********
Function objects are created by function definitions. The only
operation on a function object is to call it: "func(argument-list)".
There are really two flavors of function objects: built-in functions
and user-defined functions. Both support the same operation (to call
the function), but the implementation is different, hence the
different object types.
See Function definitions for more information.
u(. Mapping Types — "dict"
**********************
A *mapping* object maps *hashable* values to arbitrary objects.
Mappings are mutable objects. There is currently only one standard
mapping type, the *dictionary*. (For other containers see the built-
in "list", "set", and "tuple" classes, and the "collections" module.)
A dictionary’s keys are *almost* arbitrary values. Values that are
not *hashable*, that is, values containing lists, dictionaries or
other mutable types (that are compared by value rather than by object
identity) may not be used as keys. Numeric types used for keys obey
the normal rules for numeric comparison: if two numbers compare equal
(such as "1" and "1.0") then they can be used interchangeably to index
the same dictionary entry. (Note however, that since computers store
floating-point numbers as approximations it is usually unwise to use
them as dictionary keys.)
Dictionaries can be created by placing a comma-separated list of "key:
value" pairs within braces, for example: "{'jack': 4098, 'sjoerd':
4127}" or "{4098: 'jack', 4127: 'sjoerd'}", or by the "dict"
constructor.
class dict(**kwarg)
class dict(mapping, **kwarg)
class dict(iterable, **kwarg)
Return a new dictionary initialized from an optional positional
argument and a possibly empty set of keyword arguments.
Dictionaries can be created by several means:
* Use a comma-separated list of "key: value" pairs within braces:
"{'jack': 4098, 'sjoerd': 4127}" or "{4098: 'jack', 4127:
'sjoerd'}"
* Use a dict comprehension: "{}", "{x: x ** 2 for x in range(10)}"
* Use the type constructor: "dict()", "dict([('foo', 100), ('bar',
200)])", "dict(foo=100, bar=200)"
If no positional argument is given, an empty dictionary is created.
If a positional argument is given and it is a mapping object, a
dictionary is created with the same key-value pairs as the mapping
object. Otherwise, the positional argument must be an *iterable*
object. Each item in the iterable must itself be an iterable with
exactly two objects. The first object of each item becomes a key
in the new dictionary, and the second object the corresponding
value. If a key occurs more than once, the last value for that key
becomes the corresponding value in the new dictionary.
If keyword arguments are given, the keyword arguments and their
values are added to the dictionary created from the positional
argument. If a key being added is already present, the value from
the keyword argument replaces the value from the positional
argument.
To illustrate, the following examples all return a dictionary equal
to "{"one": 1, "two": 2, "three": 3}":
>>> a = dict(one=1, two=2, three=3)
>>> b = {'one': 1, 'two': 2, 'three': 3}
>>> c = dict(zip(['one', 'two', 'three'], [1, 2, 3]))
>>> d = dict([('two', 2), ('one', 1), ('three', 3)])
>>> e = dict({'three': 3, 'one': 1, 'two': 2})
>>> a == b == c == d == e
True
Providing keyword arguments as in the first example only works for
keys that are valid Python identifiers. Otherwise, any valid keys
can be used.
These are the operations that dictionaries support (and therefore,
custom mapping types should support too):
list(d)
Return a list of all the keys used in the dictionary *d*.
len(d)
Return the number of items in the dictionary *d*.
d[key]
Return the item of *d* with key *key*. Raises a "KeyError" if
*key* is not in the map.
If a subclass of dict defines a method "__missing__()" and *key*
is not present, the "d[key]" operation calls that method with
the key *key* as argument. The "d[key]" operation then returns
or raises whatever is returned or raised by the
"__missing__(key)" call. No other operations or methods invoke
"__missing__()". If "__missing__()" is not defined, "KeyError"
is raised. "__missing__()" must be a method; it cannot be an
instance variable:
>>> class Counter(dict):
... def __missing__(self, key):
... return 0
>>> c = Counter()
>>> c['red']
0
>>> c['red'] += 1
>>> c['red']
1
The example above shows part of the implementation of
"collections.Counter". A different "__missing__" method is used
by "collections.defaultdict".
d[key] = value
Set "d[key]" to *value*.
del d[key]
Remove "d[key]" from *d*. Raises a "KeyError" if *key* is not
in the map.
key in d
Return "True" if *d* has a key *key*, else "False".
key not in d
Equivalent to "not key in d".
iter(d)
Return an iterator over the keys of the dictionary. This is a
shortcut for "iter(d.keys())".
clear()
Remove all items from the dictionary.
copy()
Return a shallow copy of the dictionary.
classmethod fromkeys(iterable[, value])
Create a new dictionary with keys from *iterable* and values set
to *value*.
"fromkeys()" is a class method that returns a new dictionary.
*value* defaults to "None". All of the values refer to just a
single instance, so it generally doesn’t make sense for *value*
to be a mutable object such as an empty list. To get distinct
values, use a dict comprehension instead.
get(key[, default])
Return the value for *key* if *key* is in the dictionary, else
*default*. If *default* is not given, it defaults to "None", so
that this method never raises a "KeyError".
items()
Return a new view of the dictionary’s items ("(key, value)"
pairs). See the documentation of view objects.
keys()
Return a new view of the dictionary’s keys. See the
documentation of view objects.
pop(key[, default])
If *key* is in the dictionary, remove it and return its value,
else return *default*. If *default* is not given and *key* is
not in the dictionary, a "KeyError" is raised.
popitem()
Remove and return a "(key, value)" pair from the dictionary.
Pairs are returned in LIFO (last-in, first-out) order.
"popitem()" is useful to destructively iterate over a
dictionary, as often used in set algorithms. If the dictionary
is empty, calling "popitem()" raises a "KeyError".
Changed in version 3.7: LIFO order is now guaranteed. In prior
versions, "popitem()" would return an arbitrary key/value pair.
reversed(d)
Return a reverse iterator over the keys of the dictionary. This
is a shortcut for "reversed(d.keys())".
New in version 3.8.
setdefault(key[, default])
If *key* is in the dictionary, return its value. If not, insert
*key* with a value of *default* and return *default*. *default*
defaults to "None".
update([other])
Update the dictionary with the key/value pairs from *other*,
overwriting existing keys. Return "None".
"update()" accepts either another dictionary object or an
iterable of key/value pairs (as tuples or other iterables of
length two). If keyword arguments are specified, the dictionary
is then updated with those key/value pairs: "d.update(red=1,
blue=2)".
values()
Return a new view of the dictionary’s values. See the
documentation of view objects.
An equality comparison between one "dict.values()" view and
another will always return "False". This also applies when
comparing "dict.values()" to itself:
>>> d = {'a': 1}
>>> d.values() == d.values()
False
Dictionaries compare equal if and only if they have the same "(key,
value)" pairs (regardless of ordering). Order comparisons (‘<’,
‘<=’, ‘>=’, ‘>’) raise "TypeError".
Dictionaries preserve insertion order. Note that updating a key
does not affect the order. Keys added after deletion are inserted
at the end.
>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> d
{'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> list(d)
['one', 'two', 'three', 'four']
>>> list(d.values())
[1, 2, 3, 4]
>>> d["one"] = 42
>>> d
{'one': 42, 'two': 2, 'three': 3, 'four': 4}
>>> del d["two"]
>>> d["two"] = None
>>> d
{'one': 42, 'three': 3, 'four': 4, 'two': None}
Changed in version 3.7: Dictionary order is guaranteed to be
insertion order. This behavior was an implementation detail of
CPython from 3.6.
Dictionaries and dictionary views are reversible.
>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> d
{'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> list(reversed(d))
['four', 'three', 'two', 'one']
>>> list(reversed(d.values()))
[4, 3, 2, 1]
>>> list(reversed(d.items()))
[('four', 4), ('three', 3), ('two', 2), ('one', 1)]
Changed in version 3.8: Dictionaries are now reversible.
See also:
"types.MappingProxyType" can be used to create a read-only view of a
"dict".
Dictionary view objects
=======================
The objects returned by "dict.keys()", "dict.values()" and
"dict.items()" are *view objects*. They provide a dynamic view on the
dictionary’s entries, which means that when the dictionary changes,
the view reflects these changes.
Dictionary views can be iterated over to yield their respective data,
and support membership tests:
len(dictview)
Return the number of entries in the dictionary.
iter(dictview)
Return an iterator over the keys, values or items (represented as
tuples of "(key, value)") in the dictionary.
Keys and values are iterated over in insertion order. This allows
the creation of "(value, key)" pairs using "zip()": "pairs =
zip(d.values(), d.keys())". Another way to create the same list is
"pairs = [(v, k) for (k, v) in d.items()]".
Iterating views while adding or deleting entries in the dictionary
may raise a "RuntimeError" or fail to iterate over all entries.
Changed in version 3.7: Dictionary order is guaranteed to be
insertion order.
x in dictview
Return "True" if *x* is in the underlying dictionary’s keys, values
or items (in the latter case, *x* should be a "(key, value)"
tuple).
reversed(dictview)
Return a reverse iterator over the keys, values or items of the
dictionary. The view will be iterated in reverse order of the
insertion.
Changed in version 3.8: Dictionary views are now reversible.
Keys views are set-like since their entries are unique and hashable.
If all values are hashable, so that "(key, value)" pairs are unique
and hashable, then the items view is also set-like. (Values views are
not treated as set-like since the entries are generally not unique.)
For set-like views, all of the operations defined for the abstract
base class "collections.abc.Set" are available (for example, "==",
"<", or "^").
An example of dictionary view usage:
>>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500}
>>> keys = dishes.keys()
>>> values = dishes.values()
>>> # iteration
>>> n = 0
>>> for val in values:
... n += val
>>> print(n)
504
>>> # keys and values are iterated over in the same order (insertion order)
>>> list(keys)
['eggs', 'sausage', 'bacon', 'spam']
>>> list(values)
[2, 1, 1, 500]
>>> # view objects are dynamic and reflect dict changes
>>> del dishes['eggs']
>>> del dishes['sausage']
>>> list(keys)
['bacon', 'spam']
>>> # set operations
>>> keys & {'eggs', 'bacon', 'salad'}
{'bacon'}
>>> keys ^ {'sausage', 'juice'}
{'juice', 'sausage', 'bacon', 'spam'}
a� Methods
*******
Methods are functions that are called using the attribute notation.
There are two flavors: built-in methods (such as "append()" on lists)
and class instance methods. Built-in methods are described with the
types that support them.
If you access a method (a function defined in a class namespace)
through an instance, you get a special object: a *bound method* (also
called *instance method*) object. When called, it will add the "self"
argument to the argument list. Bound methods have two special read-
only attributes: "m.__self__" is the object on which the method
operates, and "m.__func__" is the function implementing the method.
Calling "m(arg-1, arg-2, ..., arg-n)" is completely equivalent to
calling "m.__func__(m.__self__, arg-1, arg-2, ..., arg-n)".
Like function objects, bound method objects support getting arbitrary
attributes. However, since method attributes are actually stored on
the underlying function object ("meth.__func__"), setting method
attributes on bound methods is disallowed. Attempting to set an
attribute on a method results in an "AttributeError" being raised. In
order to set a method attribute, you need to explicitly set it on the
underlying function object:
>>> class C:
... def method(self):
... pass
...
>>> c = C()
>>> c.method.whoami = 'my name is method' # can't set on the method
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'method' object has no attribute 'whoami'
>>> c.method.__func__.whoami = 'my name is method'
>>> c.method.whoami
'my name is method'
See The standard type hierarchy for more information.
u$ Modules
*******
The only special operation on a module is attribute access: "m.name",
where *m* is a module and *name* accesses a name defined in *m*’s
symbol table. Module attributes can be assigned to. (Note that the
"import" statement is not, strictly speaking, an operation on a module
object; "import foo" does not require a module object named *foo* to
exist, rather it requires an (external) *definition* for a module
named *foo* somewhere.)
A special attribute of every module is "__dict__". This is the
dictionary containing the module’s symbol table. Modifying this
dictionary will actually change the module’s symbol table, but direct
assignment to the "__dict__" attribute is not possible (you can write
"m.__dict__['a'] = 1", which defines "m.a" to be "1", but you can’t
write "m.__dict__ = {}"). Modifying "__dict__" directly is not
recommended.
Modules built into the interpreter are written like this: "<module
'sys' (built-in)>". If loaded from a file, they are written as
"<module 'os' from '/usr/local/lib/pythonX.Y/os.pyc'>".
u�Z Sequence Types — "list", "tuple", "range"
*****************************************
There are three basic sequence types: lists, tuples, and range
objects. Additional sequence types tailored for processing of binary
data and text strings are described in dedicated sections.
Common Sequence Operations
==========================
The operations in the following table are supported by most sequence
types, both mutable and immutable. The "collections.abc.Sequence" ABC
is provided to make it easier to correctly implement these operations
on custom sequence types.
This table lists the sequence operations sorted in ascending priority.
In the table, *s* and *t* are sequences of the same type, *n*, *i*,
*j* and *k* are integers and *x* is an arbitrary object that meets any
type and value restrictions imposed by *s*.
The "in" and "not in" operations have the same priorities as the
comparison operations. The "+" (concatenation) and "*" (repetition)
operations have the same priority as the corresponding numeric
operations. [3]
+----------------------------+----------------------------------+------------+
| Operation | Result | Notes |
|============================|==================================|============|
| "x in s" | "True" if an item of *s* is | (1) |
| | equal to *x*, else "False" | |
+----------------------------+----------------------------------+------------+
| "x not in s" | "False" if an item of *s* is | (1) |
| | equal to *x*, else "True" | |
+----------------------------+----------------------------------+------------+
| "s + t" | the concatenation of *s* and *t* | (6)(7) |
+----------------------------+----------------------------------+------------+
| "s * n" or "n * s" | equivalent to adding *s* to | (2)(7) |
| | itself *n* times | |
+----------------------------+----------------------------------+------------+
| "s[i]" | *i*th item of *s*, origin 0 | (3) |
+----------------------------+----------------------------------+------------+
| "s[i:j]" | slice of *s* from *i* to *j* | (3)(4) |
+----------------------------+----------------------------------+------------+
| "s[i:j:k]" | slice of *s* from *i* to *j* | (3)(5) |
| | with step *k* | |
+----------------------------+----------------------------------+------------+
| "len(s)" | length of *s* | |
+----------------------------+----------------------------------+------------+
| "min(s)" | smallest item of *s* | |
+----------------------------+----------------------------------+------------+
| "max(s)" | largest item of *s* | |
+----------------------------+----------------------------------+------------+
| "s.index(x[, i[, j]])" | index of the first occurrence of | (8) |
| | *x* in *s* (at or after index | |
| | *i* and before index *j*) | |
+----------------------------+----------------------------------+------------+
| "s.count(x)" | total number of occurrences of | |
| | *x* in *s* | |
+----------------------------+----------------------------------+------------+
Sequences of the same type also support comparisons. In particular,
tuples and lists are compared lexicographically by comparing
corresponding elements. This means that to compare equal, every
element must compare equal and the two sequences must be of the same
type and have the same length. (For full details see Comparisons in
the language reference.)
Notes:
1. While the "in" and "not in" operations are used only for simple
containment testing in the general case, some specialised sequences
(such as "str", "bytes" and "bytearray") also use them for
subsequence testing:
>>> "gg" in "eggs"
True
2. Values of *n* less than "0" are treated as "0" (which yields an
empty sequence of the same type as *s*). Note that items in the
sequence *s* are not copied; they are referenced multiple times.
This often haunts new Python programmers; consider:
>>> lists = [[]] * 3
>>> lists
[[], [], []]
>>> lists[0].append(3)
>>> lists
[[3], [3], [3]]
What has happened is that "[[]]" is a one-element list containing
an empty list, so all three elements of "[[]] * 3" are references
to this single empty list. Modifying any of the elements of
"lists" modifies this single list. You can create a list of
different lists this way:
>>> lists = [[] for i in range(3)]
>>> lists[0].append(3)
>>> lists[1].append(5)
>>> lists[2].append(7)
>>> lists
[[3], [5], [7]]
Further explanation is available in the FAQ entry How do I create a
multidimensional list?.
3. If *i* or *j* is negative, the index is relative to the end of
sequence *s*: "len(s) + i" or "len(s) + j" is substituted. But
note that "-0" is still "0".
4. The slice of *s* from *i* to *j* is defined as the sequence of
items with index *k* such that "i <= k < j". If *i* or *j* is
greater than "len(s)", use "len(s)". If *i* is omitted or "None",
use "0". If *j* is omitted or "None", use "len(s)". If *i* is
greater than or equal to *j*, the slice is empty.
5. The slice of *s* from *i* to *j* with step *k* is defined as the
sequence of items with index "x = i + n*k" such that "0 <= n <
(j-i)/k". In other words, the indices are "i", "i+k", "i+2*k",
"i+3*k" and so on, stopping when *j* is reached (but never
including *j*). When *k* is positive, *i* and *j* are reduced to
"len(s)" if they are greater. When *k* is negative, *i* and *j* are
reduced to "len(s) - 1" if they are greater. If *i* or *j* are
omitted or "None", they become “end” values (which end depends on
the sign of *k*). Note, *k* cannot be zero. If *k* is "None", it
is treated like "1".
6. Concatenating immutable sequences always results in a new object.
This means that building up a sequence by repeated concatenation
will have a quadratic runtime cost in the total sequence length.
To get a linear runtime cost, you must switch to one of the
alternatives below:
* if concatenating "str" objects, you can build a list and use
"str.join()" at the end or else write to an "io.StringIO"
instance and retrieve its value when complete
* if concatenating "bytes" objects, you can similarly use
"bytes.join()" or "io.BytesIO", or you can do in-place
concatenation with a "bytearray" object. "bytearray" objects are
mutable and have an efficient overallocation mechanism
* if concatenating "tuple" objects, extend a "list" instead
* for other types, investigate the relevant class documentation
7. Some sequence types (such as "range") only support item sequences
that follow specific patterns, and hence don’t support sequence
concatenation or repetition.
8. "index" raises "ValueError" when *x* is not found in *s*. Not all
implementations support passing the additional arguments *i* and
*j*. These arguments allow efficient searching of subsections of
the sequence. Passing the extra arguments is roughly equivalent to
using "s[i:j].index(x)", only without copying any data and with the
returned index being relative to the start of the sequence rather
than the start of the slice.
Immutable Sequence Types
========================
The only operation that immutable sequence types generally implement
that is not also implemented by mutable sequence types is support for
the "hash()" built-in.
This support allows immutable sequences, such as "tuple" instances, to
be used as "dict" keys and stored in "set" and "frozenset" instances.
Attempting to hash an immutable sequence that contains unhashable
values will result in "TypeError".
Mutable Sequence Types
======================
The operations in the following table are defined on mutable sequence
types. The "collections.abc.MutableSequence" ABC is provided to make
it easier to correctly implement these operations on custom sequence
types.
In the table *s* is an instance of a mutable sequence type, *t* is any
iterable object and *x* is an arbitrary object that meets any type and
value restrictions imposed by *s* (for example, "bytearray" only
accepts integers that meet the value restriction "0 <= x <= 255").
+--------------------------------+----------------------------------+-----------------------+
| Operation | Result | Notes |
|================================|==================================|=======================|
| "s[i] = x" | item *i* of *s* is replaced by | |
| | *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j] = t" | slice of *s* from *i* to *j* is | |
| | replaced by the contents of the | |
| | iterable *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j]" | same as "s[i:j] = []" | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j:k] = t" | the elements of "s[i:j:k]" are | (1) |
| | replaced by those of *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j:k]" | removes the elements of | |
| | "s[i:j:k]" from the list | |
+--------------------------------+----------------------------------+-----------------------+
| "s.append(x)" | appends *x* to the end of the | |
| | sequence (same as | |
| | "s[len(s):len(s)] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.clear()" | removes all items from *s* (same | (5) |
| | as "del s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.copy()" | creates a shallow copy of *s* | (5) |
| | (same as "s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.extend(t)" or "s += t" | extends *s* with the contents of | |
| | *t* (for the most part the same | |
| | as "s[len(s):len(s)] = t") | |
+--------------------------------+----------------------------------+-----------------------+
| "s *= n" | updates *s* with its contents | (6) |
| | repeated *n* times | |
+--------------------------------+----------------------------------+-----------------------+
| "s.insert(i, x)" | inserts *x* into *s* at the | |
| | index given by *i* (same as | |
| | "s[i:i] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.pop()" or "s.pop(i)" | retrieves the item at *i* and | (2) |
| | also removes it from *s* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.remove(x)" | remove the first item from *s* | (3) |
| | where "s[i]" is equal to *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.reverse()" | reverses the items of *s* in | (4) |
| | place | |
+--------------------------------+----------------------------------+-----------------------+
Notes:
1. *t* must have the same length as the slice it is replacing.
2. The optional argument *i* defaults to "-1", so that by default the
last item is removed and returned.
3. "remove()" raises "ValueError" when *x* is not found in *s*.
4. The "reverse()" method modifies the sequence in place for economy
of space when reversing a large sequence. To remind users that it
operates by side effect, it does not return the reversed sequence.
5. "clear()" and "copy()" are included for consistency with the
interfaces of mutable containers that don’t support slicing
operations (such as "dict" and "set"). "copy()" is not part of the
"collections.abc.MutableSequence" ABC, but most concrete mutable
sequence classes provide it.
New in version 3.3: "clear()" and "copy()" methods.
6. The value *n* is an integer, or an object implementing
"__index__()". Zero and negative values of *n* clear the sequence.
Items in the sequence are not copied; they are referenced multiple
times, as explained for "s * n" under Common Sequence Operations.
Lists
=====
Lists are mutable sequences, typically used to store collections of
homogeneous items (where the precise degree of similarity will vary by
application).
class list([iterable])
Lists may be constructed in several ways:
* Using a pair of square brackets to denote the empty list: "[]"
* Using square brackets, separating items with commas: "[a]", "[a,
b, c]"
* Using a list comprehension: "[x for x in iterable]"
* Using the type constructor: "list()" or "list(iterable)"
The constructor builds a list whose items are the same and in the
same order as *iterable*’s items. *iterable* may be either a
sequence, a container that supports iteration, or an iterator
object. If *iterable* is already a list, a copy is made and
returned, similar to "iterable[:]". For example, "list('abc')"
returns "['a', 'b', 'c']" and "list( (1, 2, 3) )" returns "[1, 2,
3]". If no argument is given, the constructor creates a new empty
list, "[]".
Many other operations also produce lists, including the "sorted()"
built-in.
Lists implement all of the common and mutable sequence operations.
Lists also provide the following additional method:
sort(*, key=None, reverse=False)
This method sorts the list in place, using only "<" comparisons
between items. Exceptions are not suppressed - if any comparison
operations fail, the entire sort operation will fail (and the
list will likely be left in a partially modified state).
"sort()" accepts two arguments that can only be passed by
keyword (keyword-only arguments):
*key* specifies a function of one argument that is used to
extract a comparison key from each list element (for example,
"key=str.lower"). The key corresponding to each item in the list
is calculated once and then used for the entire sorting process.
The default value of "None" means that list items are sorted
directly without calculating a separate key value.
The "functools.cmp_to_key()" utility is available to convert a
2.x style *cmp* function to a *key* function.
*reverse* is a boolean value. If set to "True", then the list
elements are sorted as if each comparison were reversed.
This method modifies the sequence in place for economy of space
when sorting a large sequence. To remind users that it operates
by side effect, it does not return the sorted sequence (use
"sorted()" to explicitly request a new sorted list instance).
The "sort()" method is guaranteed to be stable. A sort is
stable if it guarantees not to change the relative order of
elements that compare equal — this is helpful for sorting in
multiple passes (for example, sort by department, then by salary
grade).
For sorting examples and a brief sorting tutorial, see Sorting
HOW TO.
**CPython implementation detail:** While a list is being sorted,
the effect of attempting to mutate, or even inspect, the list is
undefined. The C implementation of Python makes the list appear
empty for the duration, and raises "ValueError" if it can detect
that the list has been mutated during a sort.
Tuples
======
Tuples are immutable sequences, typically used to store collections of
heterogeneous data (such as the 2-tuples produced by the "enumerate()"
built-in). Tuples are also used for cases where an immutable sequence
of homogeneous data is needed (such as allowing storage in a "set" or
"dict" instance).
class tuple([iterable])
Tuples may be constructed in a number of ways:
* Using a pair of parentheses to denote the empty tuple: "()"
* Using a trailing comma for a singleton tuple: "a," or "(a,)"
* Separating items with commas: "a, b, c" or "(a, b, c)"
* Using the "tuple()" built-in: "tuple()" or "tuple(iterable)"
The constructor builds a tuple whose items are the same and in the
same order as *iterable*’s items. *iterable* may be either a
sequence, a container that supports iteration, or an iterator
object. If *iterable* is already a tuple, it is returned
unchanged. For example, "tuple('abc')" returns "('a', 'b', 'c')"
and "tuple( [1, 2, 3] )" returns "(1, 2, 3)". If no argument is
given, the constructor creates a new empty tuple, "()".
Note that it is actually the comma which makes a tuple, not the
parentheses. The parentheses are optional, except in the empty
tuple case, or when they are needed to avoid syntactic ambiguity.
For example, "f(a, b, c)" is a function call with three arguments,
while "f((a, b, c))" is a function call with a 3-tuple as the sole
argument.
Tuples implement all of the common sequence operations.
For heterogeneous collections of data where access by name is clearer
than access by index, "collections.namedtuple()" may be a more
appropriate choice than a simple tuple object.
Ranges
======
The "range" type represents an immutable sequence of numbers and is
commonly used for looping a specific number of times in "for" loops.
class range(stop)
class range(start, stop[, step])
The arguments to the range constructor must be integers (either
built-in "int" or any object that implements the "__index__"
special method). If the *step* argument is omitted, it defaults to
"1". If the *start* argument is omitted, it defaults to "0". If
*step* is zero, "ValueError" is raised.
For a positive *step*, the contents of a range "r" are determined
by the formula "r[i] = start + step*i" where "i >= 0" and "r[i] <
stop".
For a negative *step*, the contents of the range are still
determined by the formula "r[i] = start + step*i", but the
constraints are "i >= 0" and "r[i] > stop".
A range object will be empty if "r[0]" does not meet the value
constraint. Ranges do support negative indices, but these are
interpreted as indexing from the end of the sequence determined by
the positive indices.
Ranges containing absolute values larger than "sys.maxsize" are
permitted but some features (such as "len()") may raise
"OverflowError".
Range examples:
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> list(range(1, 11))
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> list(range(0, 30, 5))
[0, 5, 10, 15, 20, 25]
>>> list(range(0, 10, 3))
[0, 3, 6, 9]
>>> list(range(0, -10, -1))
[0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
>>> list(range(0))
[]
>>> list(range(1, 0))
[]
Ranges implement all of the common sequence operations except
concatenation and repetition (due to the fact that range objects
can only represent sequences that follow a strict pattern and
repetition and concatenation will usually violate that pattern).
start
The value of the *start* parameter (or "0" if the parameter was
not supplied)
stop
The value of the *stop* parameter
step
The value of the *step* parameter (or "1" if the parameter was
not supplied)
The advantage of the "range" type over a regular "list" or "tuple" is
that a "range" object will always take the same (small) amount of
memory, no matter the size of the range it represents (as it only
stores the "start", "stop" and "step" values, calculating individual
items and subranges as needed).
Range objects implement the "collections.abc.Sequence" ABC, and
provide features such as containment tests, element index lookup,
slicing and support for negative indices (see Sequence Types — list,
tuple, range):
>>> r = range(0, 20, 2)
>>> r
range(0, 20, 2)
>>> 11 in r
False
>>> 10 in r
True
>>> r.index(10)
5
>>> r[5]
10
>>> r[:5]
range(0, 10, 2)
>>> r[-1]
18
Testing range objects for equality with "==" and "!=" compares them as
sequences. That is, two range objects are considered equal if they
represent the same sequence of values. (Note that two range objects
that compare equal might have different "start", "stop" and "step"
attributes, for example "range(0) == range(2, 1, 3)" or "range(0, 3,
2) == range(0, 4, 2)".)
Changed in version 3.2: Implement the Sequence ABC. Support slicing
and negative indices. Test "int" objects for membership in constant
time instead of iterating through all items.
Changed in version 3.3: Define ‘==’ and ‘!=’ to compare range objects
based on the sequence of values they define (instead of comparing
based on object identity).
New in version 3.3: The "start", "stop" and "step" attributes.
See also:
* The linspace recipe shows how to implement a lazy version of range
suitable for floating point applications.
u� Mutable Sequence Types
**********************
The operations in the following table are defined on mutable sequence
types. The "collections.abc.MutableSequence" ABC is provided to make
it easier to correctly implement these operations on custom sequence
types.
In the table *s* is an instance of a mutable sequence type, *t* is any
iterable object and *x* is an arbitrary object that meets any type and
value restrictions imposed by *s* (for example, "bytearray" only
accepts integers that meet the value restriction "0 <= x <= 255").
+--------------------------------+----------------------------------+-----------------------+
| Operation | Result | Notes |
|================================|==================================|=======================|
| "s[i] = x" | item *i* of *s* is replaced by | |
| | *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j] = t" | slice of *s* from *i* to *j* is | |
| | replaced by the contents of the | |
| | iterable *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j]" | same as "s[i:j] = []" | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j:k] = t" | the elements of "s[i:j:k]" are | (1) |
| | replaced by those of *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j:k]" | removes the elements of | |
| | "s[i:j:k]" from the list | |
+--------------------------------+----------------------------------+-----------------------+
| "s.append(x)" | appends *x* to the end of the | |
| | sequence (same as | |
| | "s[len(s):len(s)] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.clear()" | removes all items from *s* (same | (5) |
| | as "del s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.copy()" | creates a shallow copy of *s* | (5) |
| | (same as "s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.extend(t)" or "s += t" | extends *s* with the contents of | |
| | *t* (for the most part the same | |
| | as "s[len(s):len(s)] = t") | |
+--------------------------------+----------------------------------+-----------------------+
| "s *= n" | updates *s* with its contents | (6) |
| | repeated *n* times | |
+--------------------------------+----------------------------------+-----------------------+
| "s.insert(i, x)" | inserts *x* into *s* at the | |
| | index given by *i* (same as | |
| | "s[i:i] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.pop()" or "s.pop(i)" | retrieves the item at *i* and | (2) |
| | also removes it from *s* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.remove(x)" | remove the first item from *s* | (3) |
| | where "s[i]" is equal to *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.reverse()" | reverses the items of *s* in | (4) |
| | place | |
+--------------------------------+----------------------------------+-----------------------+
Notes:
1. *t* must have the same length as the slice it is replacing.
2. The optional argument *i* defaults to "-1", so that by default the
last item is removed and returned.
3. "remove()" raises "ValueError" when *x* is not found in *s*.
4. The "reverse()" method modifies the sequence in place for economy
of space when reversing a large sequence. To remind users that it
operates by side effect, it does not return the reversed sequence.
5. "clear()" and "copy()" are included for consistency with the
interfaces of mutable containers that don’t support slicing
operations (such as "dict" and "set"). "copy()" is not part of the
"collections.abc.MutableSequence" ABC, but most concrete mutable
sequence classes provide it.
New in version 3.3: "clear()" and "copy()" methods.
6. The value *n* is an integer, or an object implementing
"__index__()". Zero and negative values of *n* clear the sequence.
Items in the sequence are not copied; they are referenced multiple
times, as explained for "s * n" under Common Sequence Operations.
a~ Unary arithmetic and bitwise operations
***************************************
All unary arithmetic and bitwise operations have the same priority:
u_expr ::= power | "-" u_expr | "+" u_expr | "~" u_expr
The unary "-" (minus) operator yields the negation of its numeric
argument.
The unary "+" (plus) operator yields its numeric argument unchanged.
The unary "~" (invert) operator yields the bitwise inversion of its
integer argument. The bitwise inversion of "x" is defined as
"-(x+1)". It only applies to integral numbers.
In all three cases, if the argument does not have the proper type, a
"TypeError" exception is raised.
u� The "while" statement
*********************
The "while" statement is used for repeated execution as long as an
expression is true:
while_stmt ::= "while" assignment_expression ":" suite
["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the
first suite; if the expression is false (which may be the first time
it is tested) the suite of the "else" clause, if present, is executed
and the loop terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and goes back
to testing the expression.
uM The "with" statement
********************
The "with" statement is used to wrap the execution of a block with
methods defined by a context manager (see section With Statement
Context Managers). This allows common "try"…"except"…"finally" usage
patterns to be encapsulated for convenient reuse.
with_stmt ::= "with" with_item ("," with_item)* ":" suite
with_item ::= expression ["as" target]
The execution of the "with" statement with one “item” proceeds as
follows:
1. The context expression (the expression given in the "with_item") is
evaluated to obtain a context manager.
2. The context manager’s "__enter__()" is loaded for later use.
3. The context manager’s "__exit__()" is loaded for later use.
4. The context manager’s "__enter__()" method is invoked.
5. If a target was included in the "with" statement, the return value
from "__enter__()" is assigned to it.
Note:
The "with" statement guarantees that if the "__enter__()" method
returns without an error, then "__exit__()" will always be
called. Thus, if an error occurs during the assignment to the
target list, it will be treated the same as an error occurring
within the suite would be. See step 6 below.
6. The suite is executed.
7. The context manager’s "__exit__()" method is invoked. If an
exception caused the suite to be exited, its type, value, and
traceback are passed as arguments to "__exit__()". Otherwise, three
"None" arguments are supplied.
If the suite was exited due to an exception, and the return value
from the "__exit__()" method was false, the exception is reraised.
If the return value was true, the exception is suppressed, and
execution continues with the statement following the "with"
statement.
If the suite was exited for any reason other than an exception, the
return value from "__exit__()" is ignored, and execution proceeds
at the normal location for the kind of exit that was taken.
The following code:
with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
With more than one item, the context managers are processed as if
multiple "with" statements were nested:
with A() as a, B() as b:
SUITE
is semantically equivalent to:
with A() as a:
with B() as b:
SUITE
Changed in version 3.1: Support for multiple context expressions.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
a, The "yield" statement
*********************
yield_stmt ::= yield_expression
A "yield" statement is semantically equivalent to a yield expression.
The yield statement can be used to omit the parentheses that would
otherwise be required in the equivalent yield expression statement.
For example, the yield statements
yield <expr>
yield from <expr>
are equivalent to the yield expression statements
(yield <expr>)
(yield from <expr>)
Yield expressions and statements are only used when defining a
*generator* function, and are only used in the body of the generator
function. Using yield in a function definition is sufficient to cause
that definition to create a generator function instead of a normal
function.
For full details of "yield" semantics, refer to the Yield expressions
section.
)O�assertZ
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customizationZdebugger�del�dictzdynamic-features�else�
exceptionsZ execmodelZ exprlistsZfloating�forZ
formatstringsZfunction�globalz
id-classesZ identifiers�ifZ imaginary�import�inZintegers�lambdaZlistsZnaming�nonlocalZnumbersz
numeric-typesZobjectszoperator-summary�passZpower�raise�returnzsequence-typesZshiftingZslicingsZ specialattrsZ specialnameszstring-methodsZstringsZ
subscriptions�truth�try�typesZtypesfunctionsZ typesmappingZ typesmethodsZ typesmodulesZtypesseqztypesseq-mutableZunary�while�with�yieldN)Ztopics� r r �)/usr/lib64/python3.8/pydoc_data/topics.py�<module> s ' } ( @ X 1 =` b Q> J : 3M D% I
H+1 &. L N 3"o# p3= ^ a i9 ; K9% H h� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �PK 86�\ �W �~ �~ topics.cpython-38.opt-2.pycnu �[��� U
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d d d
ddddddddddddddd d d d d d!d"d#d$d%d&d'd(d d)d*d+d,d-d.d/d0d1d2d3d4d5d6d7d8d9d:d;d<d=d>d?d@dAdBdCdDdEdFdGdHdIdJdKdLdMdN�OZ dOS )Pau The "assert" statement
**********************
Assert statements are a convenient way to insert debugging assertions
into a program:
assert_stmt ::= "assert" expression ["," expression]
The simple form, "assert expression", is equivalent to
if __debug__:
if not expression: raise AssertionError
The extended form, "assert expression1, expression2", is equivalent to
if __debug__:
if not expression1: raise AssertionError(expression2)
These equivalences assume that "__debug__" and "AssertionError" refer
to the built-in variables with those names. In the current
implementation, the built-in variable "__debug__" is "True" under
normal circumstances, "False" when optimization is requested (command
line option "-O"). The current code generator emits no code for an
assert statement when optimization is requested at compile time. Note
that it is unnecessary to include the source code for the expression
that failed in the error message; it will be displayed as part of the
stack trace.
Assignments to "__debug__" are illegal. The value for the built-in
variable is determined when the interpreter starts.
u�, Assignment statements
*********************
Assignment statements are used to (re)bind names to values and to
modify attributes or items of mutable objects:
assignment_stmt ::= (target_list "=")+ (starred_expression | yield_expression)
target_list ::= target ("," target)* [","]
target ::= identifier
| "(" [target_list] ")"
| "[" [target_list] "]"
| attributeref
| subscription
| slicing
| "*" target
(See section Primaries for the syntax definitions for *attributeref*,
*subscription*, and *slicing*.)
An assignment statement evaluates the expression list (remember that
this can be a single expression or a comma-separated list, the latter
yielding a tuple) and assigns the single resulting object to each of
the target lists, from left to right.
Assignment is defined recursively depending on the form of the target
(list). When a target is part of a mutable object (an attribute
reference, subscription or slicing), the mutable object must
ultimately perform the assignment and decide about its validity, and
may raise an exception if the assignment is unacceptable. The rules
observed by various types and the exceptions raised are given with the
definition of the object types (see section The standard type
hierarchy).
Assignment of an object to a target list, optionally enclosed in
parentheses or square brackets, is recursively defined as follows.
* If the target list is a single target with no trailing comma,
optionally in parentheses, the object is assigned to that target.
* Else: The object must be an iterable with the same number of items
as there are targets in the target list, and the items are assigned,
from left to right, to the corresponding targets.
* If the target list contains one target prefixed with an asterisk,
called a “starred” target: The object must be an iterable with at
least as many items as there are targets in the target list, minus
one. The first items of the iterable are assigned, from left to
right, to the targets before the starred target. The final items
of the iterable are assigned to the targets after the starred
target. A list of the remaining items in the iterable is then
assigned to the starred target (the list can be empty).
* Else: The object must be an iterable with the same number of items
as there are targets in the target list, and the items are
assigned, from left to right, to the corresponding targets.
Assignment of an object to a single target is recursively defined as
follows.
* If the target is an identifier (name):
* If the name does not occur in a "global" or "nonlocal" statement
in the current code block: the name is bound to the object in the
current local namespace.
* Otherwise: the name is bound to the object in the global namespace
or the outer namespace determined by "nonlocal", respectively.
The name is rebound if it was already bound. This may cause the
reference count for the object previously bound to the name to reach
zero, causing the object to be deallocated and its destructor (if it
has one) to be called.
* If the target is an attribute reference: The primary expression in
the reference is evaluated. It should yield an object with
assignable attributes; if this is not the case, "TypeError" is
raised. That object is then asked to assign the assigned object to
the given attribute; if it cannot perform the assignment, it raises
an exception (usually but not necessarily "AttributeError").
Note: If the object is a class instance and the attribute reference
occurs on both sides of the assignment operator, the right-hand side
expression, "a.x" can access either an instance attribute or (if no
instance attribute exists) a class attribute. The left-hand side
target "a.x" is always set as an instance attribute, creating it if
necessary. Thus, the two occurrences of "a.x" do not necessarily
refer to the same attribute: if the right-hand side expression
refers to a class attribute, the left-hand side creates a new
instance attribute as the target of the assignment:
class Cls:
x = 3 # class variable
inst = Cls()
inst.x = inst.x + 1 # writes inst.x as 4 leaving Cls.x as 3
This description does not necessarily apply to descriptor
attributes, such as properties created with "property()".
* If the target is a subscription: The primary expression in the
reference is evaluated. It should yield either a mutable sequence
object (such as a list) or a mapping object (such as a dictionary).
Next, the subscript expression is evaluated.
If the primary is a mutable sequence object (such as a list), the
subscript must yield an integer. If it is negative, the sequence’s
length is added to it. The resulting value must be a nonnegative
integer less than the sequence’s length, and the sequence is asked
to assign the assigned object to its item with that index. If the
index is out of range, "IndexError" is raised (assignment to a
subscripted sequence cannot add new items to a list).
If the primary is a mapping object (such as a dictionary), the
subscript must have a type compatible with the mapping’s key type,
and the mapping is then asked to create a key/datum pair which maps
the subscript to the assigned object. This can either replace an
existing key/value pair with the same key value, or insert a new
key/value pair (if no key with the same value existed).
For user-defined objects, the "__setitem__()" method is called with
appropriate arguments.
* If the target is a slicing: The primary expression in the reference
is evaluated. It should yield a mutable sequence object (such as a
list). The assigned object should be a sequence object of the same
type. Next, the lower and upper bound expressions are evaluated,
insofar they are present; defaults are zero and the sequence’s
length. The bounds should evaluate to integers. If either bound is
negative, the sequence’s length is added to it. The resulting
bounds are clipped to lie between zero and the sequence’s length,
inclusive. Finally, the sequence object is asked to replace the
slice with the items of the assigned sequence. The length of the
slice may be different from the length of the assigned sequence,
thus changing the length of the target sequence, if the target
sequence allows it.
**CPython implementation detail:** In the current implementation, the
syntax for targets is taken to be the same as for expressions, and
invalid syntax is rejected during the code generation phase, causing
less detailed error messages.
Although the definition of assignment implies that overlaps between
the left-hand side and the right-hand side are ‘simultaneous’ (for
example "a, b = b, a" swaps two variables), overlaps *within* the
collection of assigned-to variables occur left-to-right, sometimes
resulting in confusion. For instance, the following program prints
"[0, 2]":
x = [0, 1]
i = 0
i, x[i] = 1, 2 # i is updated, then x[i] is updated
print(x)
See also:
**PEP 3132** - Extended Iterable Unpacking
The specification for the "*target" feature.
Augmented assignment statements
===============================
Augmented assignment is the combination, in a single statement, of a
binary operation and an assignment statement:
augmented_assignment_stmt ::= augtarget augop (expression_list | yield_expression)
augtarget ::= identifier | attributeref | subscription | slicing
augop ::= "+=" | "-=" | "*=" | "@=" | "/=" | "//=" | "%=" | "**="
| ">>=" | "<<=" | "&=" | "^=" | "|="
(See section Primaries for the syntax definitions of the last three
symbols.)
An augmented assignment evaluates the target (which, unlike normal
assignment statements, cannot be an unpacking) and the expression
list, performs the binary operation specific to the type of assignment
on the two operands, and assigns the result to the original target.
The target is only evaluated once.
An augmented assignment expression like "x += 1" can be rewritten as
"x = x + 1" to achieve a similar, but not exactly equal effect. In the
augmented version, "x" is only evaluated once. Also, when possible,
the actual operation is performed *in-place*, meaning that rather than
creating a new object and assigning that to the target, the old object
is modified instead.
Unlike normal assignments, augmented assignments evaluate the left-
hand side *before* evaluating the right-hand side. For example, "a[i]
+= f(x)" first looks-up "a[i]", then it evaluates "f(x)" and performs
the addition, and lastly, it writes the result back to "a[i]".
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments. Similarly,
with the exception of the possible *in-place* behavior, the binary
operation performed by augmented assignment is the same as the normal
binary operations.
For targets which are attribute references, the same caveat about
class and instance attributes applies as for regular assignments.
Annotated assignment statements
===============================
*Annotation* assignment is the combination, in a single statement, of
a variable or attribute annotation and an optional assignment
statement:
annotated_assignment_stmt ::= augtarget ":" expression
["=" (starred_expression | yield_expression)]
The difference from normal Assignment statements is that only single
target is allowed.
For simple names as assignment targets, if in class or module scope,
the annotations are evaluated and stored in a special class or module
attribute "__annotations__" that is a dictionary mapping from variable
names (mangled if private) to evaluated annotations. This attribute is
writable and is automatically created at the start of class or module
body execution, if annotations are found statically.
For expressions as assignment targets, the annotations are evaluated
if in class or module scope, but not stored.
If a name is annotated in a function scope, then this name is local
for that scope. Annotations are never evaluated and stored in function
scopes.
If the right hand side is present, an annotated assignment performs
the actual assignment before evaluating annotations (where
applicable). If the right hand side is not present for an expression
target, then the interpreter evaluates the target except for the last
"__setitem__()" or "__setattr__()" call.
See also:
**PEP 526** - Syntax for Variable Annotations
The proposal that added syntax for annotating the types of
variables (including class variables and instance variables),
instead of expressing them through comments.
**PEP 484** - Type hints
The proposal that added the "typing" module to provide a standard
syntax for type annotations that can be used in static analysis
tools and IDEs.
Changed in version 3.8: Now annotated assignments allow same
expressions in the right hand side as the regular assignments.
Previously, some expressions (like un-parenthesized tuple expressions)
caused a syntax error.
u>
Coroutines
**********
New in version 3.5.
Coroutine function definition
=============================
async_funcdef ::= [decorators] "async" "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
Execution of Python coroutines can be suspended and resumed at many
points (see *coroutine*). Inside the body of a coroutine function,
"await" and "async" identifiers become reserved keywords; "await"
expressions, "async for" and "async with" can only be used in
coroutine function bodies.
Functions defined with "async def" syntax are always coroutine
functions, even if they do not contain "await" or "async" keywords.
It is a "SyntaxError" to use a "yield from" expression inside the body
of a coroutine function.
An example of a coroutine function:
async def func(param1, param2):
do_stuff()
await some_coroutine()
The "async for" statement
=========================
async_for_stmt ::= "async" for_stmt
An *asynchronous iterable* is able to call asynchronous code in its
*iter* implementation, and *asynchronous iterator* can call
asynchronous code in its *next* method.
The "async for" statement allows convenient iteration over
asynchronous iterators.
The following code:
async for TARGET in ITER:
SUITE
else:
SUITE2
Is semantically equivalent to:
iter = (ITER)
iter = type(iter).__aiter__(iter)
running = True
while running:
try:
TARGET = await type(iter).__anext__(iter)
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2
See also "__aiter__()" and "__anext__()" for details.
It is a "SyntaxError" to use an "async for" statement outside the body
of a coroutine function.
The "async with" statement
==========================
async_with_stmt ::= "async" with_stmt
An *asynchronous context manager* is a *context manager* that is able
to suspend execution in its *enter* and *exit* methods.
The following code:
async with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
aexit = type(manager).__aexit__
aenter = type(manager).__aenter__
value = await aenter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
See also "__aenter__()" and "__aexit__()" for details.
It is a "SyntaxError" to use an "async with" statement outside the
body of a coroutine function.
See also:
**PEP 492** - Coroutines with async and await syntax
The proposal that made coroutines a proper standalone concept in
Python, and added supporting syntax.
-[ Footnotes ]-
[1] The exception is propagated to the invocation stack unless there
is a "finally" clause which happens to raise another exception.
That new exception causes the old one to be lost.
[2] A string literal appearing as the first statement in the function
body is transformed into the function’s "__doc__" attribute and
therefore the function’s *docstring*.
[3] A string literal appearing as the first statement in the class
body is transformed into the namespace’s "__doc__" item and
therefore the class’s *docstring*.
a� Identifiers (Names)
*******************
An identifier occurring as an atom is a name. See section Identifiers
and keywords for lexical definition and section Naming and binding for
documentation of naming and binding.
When the name is bound to an object, evaluation of the atom yields
that object. When a name is not bound, an attempt to evaluate it
raises a "NameError" exception.
**Private name mangling:** When an identifier that textually occurs in
a class definition begins with two or more underscore characters and
does not end in two or more underscores, it is considered a *private
name* of that class. Private names are transformed to a longer form
before code is generated for them. The transformation inserts the
class name, with leading underscores removed and a single underscore
inserted, in front of the name. For example, the identifier "__spam"
occurring in a class named "Ham" will be transformed to "_Ham__spam".
This transformation is independent of the syntactical context in which
the identifier is used. If the transformed name is extremely long
(longer than 255 characters), implementation defined truncation may
happen. If the class name consists only of underscores, no
transformation is done.
u
Literals
********
Python supports string and bytes literals and various numeric
literals:
literal ::= stringliteral | bytesliteral
| integer | floatnumber | imagnumber
Evaluation of a literal yields an object of the given type (string,
bytes, integer, floating point number, complex number) with the given
value. The value may be approximated in the case of floating point
and imaginary (complex) literals. See section Literals for details.
All literals correspond to immutable data types, and hence the
object’s identity is less important than its value. Multiple
evaluations of literals with the same value (either the same
occurrence in the program text or a different occurrence) may obtain
the same object or a different object with the same value.
uA7 Customizing attribute access
****************************
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of "x.name") for
class instances.
object.__getattr__(self, name)
Called when the default attribute access fails with an
"AttributeError" (either "__getattribute__()" raises an
"AttributeError" because *name* is not an instance attribute or an
attribute in the class tree for "self"; or "__get__()" of a *name*
property raises "AttributeError"). This method should either
return the (computed) attribute value or raise an "AttributeError"
exception.
Note that if the attribute is found through the normal mechanism,
"__getattr__()" is not called. (This is an intentional asymmetry
between "__getattr__()" and "__setattr__()".) This is done both for
efficiency reasons and because otherwise "__getattr__()" would have
no way to access other attributes of the instance. Note that at
least for instance variables, you can fake total control by not
inserting any values in the instance attribute dictionary (but
instead inserting them in another object). See the
"__getattribute__()" method below for a way to actually get total
control over attribute access.
object.__getattribute__(self, name)
Called unconditionally to implement attribute accesses for
instances of the class. If the class also defines "__getattr__()",
the latter will not be called unless "__getattribute__()" either
calls it explicitly or raises an "AttributeError". This method
should return the (computed) attribute value or raise an
"AttributeError" exception. In order to avoid infinite recursion in
this method, its implementation should always call the base class
method with the same name to access any attributes it needs, for
example, "object.__getattribute__(self, name)".
Note:
This method may still be bypassed when looking up special methods
as the result of implicit invocation via language syntax or
built-in functions. See Special method lookup.
For certain sensitive attribute accesses, raises an auditing event
"object.__getattr__" with arguments "obj" and "name".
object.__setattr__(self, name, value)
Called when an attribute assignment is attempted. This is called
instead of the normal mechanism (i.e. store the value in the
instance dictionary). *name* is the attribute name, *value* is the
value to be assigned to it.
If "__setattr__()" wants to assign to an instance attribute, it
should call the base class method with the same name, for example,
"object.__setattr__(self, name, value)".
For certain sensitive attribute assignments, raises an auditing
event "object.__setattr__" with arguments "obj", "name", "value".
object.__delattr__(self, name)
Like "__setattr__()" but for attribute deletion instead of
assignment. This should only be implemented if "del obj.name" is
meaningful for the object.
For certain sensitive attribute deletions, raises an auditing event
"object.__delattr__" with arguments "obj" and "name".
object.__dir__(self)
Called when "dir()" is called on the object. A sequence must be
returned. "dir()" converts the returned sequence to a list and
sorts it.
Customizing module attribute access
===================================
Special names "__getattr__" and "__dir__" can be also used to
customize access to module attributes. The "__getattr__" function at
the module level should accept one argument which is the name of an
attribute and return the computed value or raise an "AttributeError".
If an attribute is not found on a module object through the normal
lookup, i.e. "object.__getattribute__()", then "__getattr__" is
searched in the module "__dict__" before raising an "AttributeError".
If found, it is called with the attribute name and the result is
returned.
The "__dir__" function should accept no arguments, and return a
sequence of strings that represents the names accessible on module. If
present, this function overrides the standard "dir()" search on a
module.
For a more fine grained customization of the module behavior (setting
attributes, properties, etc.), one can set the "__class__" attribute
of a module object to a subclass of "types.ModuleType". For example:
import sys
from types import ModuleType
class VerboseModule(ModuleType):
def __repr__(self):
return f'Verbose {self.__name__}'
def __setattr__(self, attr, value):
print(f'Setting {attr}...')
super().__setattr__(attr, value)
sys.modules[__name__].__class__ = VerboseModule
Note:
Defining module "__getattr__" and setting module "__class__" only
affect lookups made using the attribute access syntax – directly
accessing the module globals (whether by code within the module, or
via a reference to the module’s globals dictionary) is unaffected.
Changed in version 3.5: "__class__" module attribute is now writable.
New in version 3.7: "__getattr__" and "__dir__" module attributes.
See also:
**PEP 562** - Module __getattr__ and __dir__
Describes the "__getattr__" and "__dir__" functions on modules.
Implementing Descriptors
========================
The following methods only apply when an instance of the class
containing the method (a so-called *descriptor* class) appears in an
*owner* class (the descriptor must be in either the owner’s class
dictionary or in the class dictionary for one of its parents). In the
examples below, “the attribute” refers to the attribute whose name is
the key of the property in the owner class’ "__dict__".
object.__get__(self, instance, owner=None)
Called to get the attribute of the owner class (class attribute
access) or of an instance of that class (instance attribute
access). The optional *owner* argument is the owner class, while
*instance* is the instance that the attribute was accessed through,
or "None" when the attribute is accessed through the *owner*.
This method should return the computed attribute value or raise an
"AttributeError" exception.
**PEP 252** specifies that "__get__()" is callable with one or two
arguments. Python’s own built-in descriptors support this
specification; however, it is likely that some third-party tools
have descriptors that require both arguments. Python’s own
"__getattribute__()" implementation always passes in both arguments
whether they are required or not.
object.__set__(self, instance, value)
Called to set the attribute on an instance *instance* of the owner
class to a new value, *value*.
Note, adding "__set__()" or "__delete__()" changes the kind of
descriptor to a “data descriptor”. See Invoking Descriptors for
more details.
object.__delete__(self, instance)
Called to delete the attribute on an instance *instance* of the
owner class.
object.__set_name__(self, owner, name)
Called at the time the owning class *owner* is created. The
descriptor has been assigned to *name*.
Note:
"__set_name__()" is only called implicitly as part of the "type"
constructor, so it will need to be called explicitly with the
appropriate parameters when a descriptor is added to a class
after initial creation:
class A:
pass
descr = custom_descriptor()
A.attr = descr
descr.__set_name__(A, 'attr')
See Creating the class object for more details.
New in version 3.6.
The attribute "__objclass__" is interpreted by the "inspect" module as
specifying the class where this object was defined (setting this
appropriately can assist in runtime introspection of dynamic class
attributes). For callables, it may indicate that an instance of the
given type (or a subclass) is expected or required as the first
positional argument (for example, CPython sets this attribute for
unbound methods that are implemented in C).
Invoking Descriptors
====================
In general, a descriptor is an object attribute with “binding
behavior”, one whose attribute access has been overridden by methods
in the descriptor protocol: "__get__()", "__set__()", and
"__delete__()". If any of those methods are defined for an object, it
is said to be a descriptor.
The default behavior for attribute access is to get, set, or delete
the attribute from an object’s dictionary. For instance, "a.x" has a
lookup chain starting with "a.__dict__['x']", then
"type(a).__dict__['x']", and continuing through the base classes of
"type(a)" excluding metaclasses.
However, if the looked-up value is an object defining one of the
descriptor methods, then Python may override the default behavior and
invoke the descriptor method instead. Where this occurs in the
precedence chain depends on which descriptor methods were defined and
how they were called.
The starting point for descriptor invocation is a binding, "a.x". How
the arguments are assembled depends on "a":
Direct Call
The simplest and least common call is when user code directly
invokes a descriptor method: "x.__get__(a)".
Instance Binding
If binding to an object instance, "a.x" is transformed into the
call: "type(a).__dict__['x'].__get__(a, type(a))".
Class Binding
If binding to a class, "A.x" is transformed into the call:
"A.__dict__['x'].__get__(None, A)".
Super Binding
If "a" is an instance of "super", then the binding "super(B,
obj).m()" searches "obj.__class__.__mro__" for the base class "A"
immediately preceding "B" and then invokes the descriptor with the
call: "A.__dict__['m'].__get__(obj, obj.__class__)".
For instance bindings, the precedence of descriptor invocation depends
on which descriptor methods are defined. A descriptor can define any
combination of "__get__()", "__set__()" and "__delete__()". If it
does not define "__get__()", then accessing the attribute will return
the descriptor object itself unless there is a value in the object’s
instance dictionary. If the descriptor defines "__set__()" and/or
"__delete__()", it is a data descriptor; if it defines neither, it is
a non-data descriptor. Normally, data descriptors define both
"__get__()" and "__set__()", while non-data descriptors have just the
"__get__()" method. Data descriptors with "__set__()" and "__get__()"
defined always override a redefinition in an instance dictionary. In
contrast, non-data descriptors can be overridden by instances.
Python methods (including "staticmethod()" and "classmethod()") are
implemented as non-data descriptors. Accordingly, instances can
redefine and override methods. This allows individual instances to
acquire behaviors that differ from other instances of the same class.
The "property()" function is implemented as a data descriptor.
Accordingly, instances cannot override the behavior of a property.
__slots__
=========
*__slots__* allow us to explicitly declare data members (like
properties) and deny the creation of *__dict__* and *__weakref__*
(unless explicitly declared in *__slots__* or available in a parent.)
The space saved over using *__dict__* can be significant. Attribute
lookup speed can be significantly improved as well.
object.__slots__
This class variable can be assigned a string, iterable, or sequence
of strings with variable names used by instances. *__slots__*
reserves space for the declared variables and prevents the
automatic creation of *__dict__* and *__weakref__* for each
instance.
Notes on using *__slots__*
--------------------------
* When inheriting from a class without *__slots__*, the *__dict__* and
*__weakref__* attribute of the instances will always be accessible.
* Without a *__dict__* variable, instances cannot be assigned new
variables not listed in the *__slots__* definition. Attempts to
assign to an unlisted variable name raises "AttributeError". If
dynamic assignment of new variables is desired, then add
"'__dict__'" to the sequence of strings in the *__slots__*
declaration.
* Without a *__weakref__* variable for each instance, classes defining
*__slots__* do not support weak references to its instances. If weak
reference support is needed, then add "'__weakref__'" to the
sequence of strings in the *__slots__* declaration.
* *__slots__* are implemented at the class level by creating
descriptors (Implementing Descriptors) for each variable name. As a
result, class attributes cannot be used to set default values for
instance variables defined by *__slots__*; otherwise, the class
attribute would overwrite the descriptor assignment.
* The action of a *__slots__* declaration is not limited to the class
where it is defined. *__slots__* declared in parents are available
in child classes. However, child subclasses will get a *__dict__*
and *__weakref__* unless they also define *__slots__* (which should
only contain names of any *additional* slots).
* If a class defines a slot also defined in a base class, the instance
variable defined by the base class slot is inaccessible (except by
retrieving its descriptor directly from the base class). This
renders the meaning of the program undefined. In the future, a
check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from
“variable-length” built-in types such as "int", "bytes" and "tuple".
* Any non-string iterable may be assigned to *__slots__*. Mappings may
also be used; however, in the future, special meaning may be
assigned to the values corresponding to each key.
* *__class__* assignment works only if both classes have the same
*__slots__*.
* Multiple inheritance with multiple slotted parent classes can be
used, but only one parent is allowed to have attributes created by
slots (the other bases must have empty slot layouts) - violations
raise "TypeError".
* If an iterator is used for *__slots__* then a descriptor is created
for each of the iterator’s values. However, the *__slots__*
attribute will be an empty iterator.
a� Attribute references
********************
An attribute reference is a primary followed by a period and a name:
attributeref ::= primary "." identifier
The primary must evaluate to an object of a type that supports
attribute references, which most objects do. This object is then
asked to produce the attribute whose name is the identifier. This
production can be customized by overriding the "__getattr__()" method.
If this attribute is not available, the exception "AttributeError" is
raised. Otherwise, the type and value of the object produced is
determined by the object. Multiple evaluations of the same attribute
reference may yield different objects.
a� Augmented assignment statements
*******************************
Augmented assignment is the combination, in a single statement, of a
binary operation and an assignment statement:
augmented_assignment_stmt ::= augtarget augop (expression_list | yield_expression)
augtarget ::= identifier | attributeref | subscription | slicing
augop ::= "+=" | "-=" | "*=" | "@=" | "/=" | "//=" | "%=" | "**="
| ">>=" | "<<=" | "&=" | "^=" | "|="
(See section Primaries for the syntax definitions of the last three
symbols.)
An augmented assignment evaluates the target (which, unlike normal
assignment statements, cannot be an unpacking) and the expression
list, performs the binary operation specific to the type of assignment
on the two operands, and assigns the result to the original target.
The target is only evaluated once.
An augmented assignment expression like "x += 1" can be rewritten as
"x = x + 1" to achieve a similar, but not exactly equal effect. In the
augmented version, "x" is only evaluated once. Also, when possible,
the actual operation is performed *in-place*, meaning that rather than
creating a new object and assigning that to the target, the old object
is modified instead.
Unlike normal assignments, augmented assignments evaluate the left-
hand side *before* evaluating the right-hand side. For example, "a[i]
+= f(x)" first looks-up "a[i]", then it evaluates "f(x)" and performs
the addition, and lastly, it writes the result back to "a[i]".
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments. Similarly,
with the exception of the possible *in-place* behavior, the binary
operation performed by augmented assignment is the same as the normal
binary operations.
For targets which are attribute references, the same caveat about
class and instance attributes applies as for regular assignments.
z�Await expression
****************
Suspend the execution of *coroutine* on an *awaitable* object. Can
only be used inside a *coroutine function*.
await_expr ::= "await" primary
New in version 3.5.
uj Binary arithmetic operations
****************************
The binary arithmetic operations have the conventional priority
levels. Note that some of these operations also apply to certain non-
numeric types. Apart from the power operator, there are only two
levels, one for multiplicative operators and one for additive
operators:
m_expr ::= u_expr | m_expr "*" u_expr | m_expr "@" m_expr |
m_expr "//" u_expr | m_expr "/" u_expr |
m_expr "%" u_expr
a_expr ::= m_expr | a_expr "+" m_expr | a_expr "-" m_expr
The "*" (multiplication) operator yields the product of its arguments.
The arguments must either both be numbers, or one argument must be an
integer and the other must be a sequence. In the former case, the
numbers are converted to a common type and then multiplied together.
In the latter case, sequence repetition is performed; a negative
repetition factor yields an empty sequence.
The "@" (at) operator is intended to be used for matrix
multiplication. No builtin Python types implement this operator.
New in version 3.5.
The "/" (division) and "//" (floor division) operators yield the
quotient of their arguments. The numeric arguments are first
converted to a common type. Division of integers yields a float, while
floor division of integers results in an integer; the result is that
of mathematical division with the ‘floor’ function applied to the
result. Division by zero raises the "ZeroDivisionError" exception.
The "%" (modulo) operator yields the remainder from the division of
the first argument by the second. The numeric arguments are first
converted to a common type. A zero right argument raises the
"ZeroDivisionError" exception. The arguments may be floating point
numbers, e.g., "3.14%0.7" equals "0.34" (since "3.14" equals "4*0.7 +
0.34".) The modulo operator always yields a result with the same sign
as its second operand (or zero); the absolute value of the result is
strictly smaller than the absolute value of the second operand [1].
The floor division and modulo operators are connected by the following
identity: "x == (x//y)*y + (x%y)". Floor division and modulo are also
connected with the built-in function "divmod()": "divmod(x, y) ==
(x//y, x%y)". [2].
In addition to performing the modulo operation on numbers, the "%"
operator is also overloaded by string objects to perform old-style
string formatting (also known as interpolation). The syntax for
string formatting is described in the Python Library Reference,
section printf-style String Formatting.
The floor division operator, the modulo operator, and the "divmod()"
function are not defined for complex numbers. Instead, convert to a
floating point number using the "abs()" function if appropriate.
The "+" (addition) operator yields the sum of its arguments. The
arguments must either both be numbers or both be sequences of the same
type. In the former case, the numbers are converted to a common type
and then added together. In the latter case, the sequences are
concatenated.
The "-" (subtraction) operator yields the difference of its arguments.
The numeric arguments are first converted to a common type.
a$ Binary bitwise operations
*************************
Each of the three bitwise operations has a different priority level:
and_expr ::= shift_expr | and_expr "&" shift_expr
xor_expr ::= and_expr | xor_expr "^" and_expr
or_expr ::= xor_expr | or_expr "|" xor_expr
The "&" operator yields the bitwise AND of its arguments, which must
be integers.
The "^" operator yields the bitwise XOR (exclusive OR) of its
arguments, which must be integers.
The "|" operator yields the bitwise (inclusive) OR of its arguments,
which must be integers.
u� Code Objects
************
Code objects are used by the implementation to represent “pseudo-
compiled” executable Python code such as a function body. They differ
from function objects because they don’t contain a reference to their
global execution environment. Code objects are returned by the built-
in "compile()" function and can be extracted from function objects
through their "__code__" attribute. See also the "code" module.
Accessing "__code__" raises an auditing event "object.__getattr__"
with arguments "obj" and ""__code__"".
A code object can be executed or evaluated by passing it (instead of a
source string) to the "exec()" or "eval()" built-in functions.
See The standard type hierarchy for more information.
a. The Ellipsis Object
*******************
This object is commonly used by slicing (see Slicings). It supports
no special operations. There is exactly one ellipsis object, named
"Ellipsis" (a built-in name). "type(Ellipsis)()" produces the
"Ellipsis" singleton.
It is written as "Ellipsis" or "...".
u The Null Object
***************
This object is returned by functions that don’t explicitly return a
value. It supports no special operations. There is exactly one null
object, named "None" (a built-in name). "type(None)()" produces the
same singleton.
It is written as "None".
u5 Type Objects
************
Type objects represent the various object types. An object’s type is
accessed by the built-in function "type()". There are no special
operations on types. The standard module "types" defines names for
all standard built-in types.
Types are written like this: "<class 'int'>".
a� Boolean operations
******************
or_test ::= and_test | or_test "or" and_test
and_test ::= not_test | and_test "and" not_test
not_test ::= comparison | "not" not_test
In the context of Boolean operations, and also when expressions are
used by control flow statements, the following values are interpreted
as false: "False", "None", numeric zero of all types, and empty
strings and containers (including strings, tuples, lists,
dictionaries, sets and frozensets). All other values are interpreted
as true. User-defined objects can customize their truth value by
providing a "__bool__()" method.
The operator "not" yields "True" if its argument is false, "False"
otherwise.
The expression "x and y" first evaluates *x*; if *x* is false, its
value is returned; otherwise, *y* is evaluated and the resulting value
is returned.
The expression "x or y" first evaluates *x*; if *x* is true, its value
is returned; otherwise, *y* is evaluated and the resulting value is
returned.
Note that neither "and" nor "or" restrict the value and type they
return to "False" and "True", but rather return the last evaluated
argument. This is sometimes useful, e.g., if "s" is a string that
should be replaced by a default value if it is empty, the expression
"s or 'foo'" yields the desired value. Because "not" has to create a
new value, it returns a boolean value regardless of the type of its
argument (for example, "not 'foo'" produces "False" rather than "''".)
a$ The "break" statement
*********************
break_stmt ::= "break"
"break" may only occur syntactically nested in a "for" or "while"
loop, but not nested in a function or class definition within that
loop.
It terminates the nearest enclosing loop, skipping the optional "else"
clause if the loop has one.
If a "for" loop is terminated by "break", the loop control target
keeps its current value.
When "break" passes control out of a "try" statement with a "finally"
clause, that "finally" clause is executed before really leaving the
loop.
u Emulating callable objects
**************************
object.__call__(self[, args...])
Called when the instance is “called” as a function; if this method
is defined, "x(arg1, arg2, ...)" roughly translates to
"type(x).__call__(x, arg1, ...)".
u� Calls
*****
A call calls a callable object (e.g., a *function*) with a possibly
empty series of *arguments*:
call ::= primary "(" [argument_list [","] | comprehension] ")"
argument_list ::= positional_arguments ["," starred_and_keywords]
["," keywords_arguments]
| starred_and_keywords ["," keywords_arguments]
| keywords_arguments
positional_arguments ::= positional_item ("," positional_item)*
positional_item ::= assignment_expression | "*" expression
starred_and_keywords ::= ("*" expression | keyword_item)
("," "*" expression | "," keyword_item)*
keywords_arguments ::= (keyword_item | "**" expression)
("," keyword_item | "," "**" expression)*
keyword_item ::= identifier "=" expression
An optional trailing comma may be present after the positional and
keyword arguments but does not affect the semantics.
The primary must evaluate to a callable object (user-defined
functions, built-in functions, methods of built-in objects, class
objects, methods of class instances, and all objects having a
"__call__()" method are callable). All argument expressions are
evaluated before the call is attempted. Please refer to section
Function definitions for the syntax of formal *parameter* lists.
If keyword arguments are present, they are first converted to
positional arguments, as follows. First, a list of unfilled slots is
created for the formal parameters. If there are N positional
arguments, they are placed in the first N slots. Next, for each
keyword argument, the identifier is used to determine the
corresponding slot (if the identifier is the same as the first formal
parameter name, the first slot is used, and so on). If the slot is
already filled, a "TypeError" exception is raised. Otherwise, the
value of the argument is placed in the slot, filling it (even if the
expression is "None", it fills the slot). When all arguments have
been processed, the slots that are still unfilled are filled with the
corresponding default value from the function definition. (Default
values are calculated, once, when the function is defined; thus, a
mutable object such as a list or dictionary used as default value will
be shared by all calls that don’t specify an argument value for the
corresponding slot; this should usually be avoided.) If there are any
unfilled slots for which no default value is specified, a "TypeError"
exception is raised. Otherwise, the list of filled slots is used as
the argument list for the call.
**CPython implementation detail:** An implementation may provide
built-in functions whose positional parameters do not have names, even
if they are ‘named’ for the purpose of documentation, and which
therefore cannot be supplied by keyword. In CPython, this is the case
for functions implemented in C that use "PyArg_ParseTuple()" to parse
their arguments.
If there are more positional arguments than there are formal parameter
slots, a "TypeError" exception is raised, unless a formal parameter
using the syntax "*identifier" is present; in this case, that formal
parameter receives a tuple containing the excess positional arguments
(or an empty tuple if there were no excess positional arguments).
If any keyword argument does not correspond to a formal parameter
name, a "TypeError" exception is raised, unless a formal parameter
using the syntax "**identifier" is present; in this case, that formal
parameter receives a dictionary containing the excess keyword
arguments (using the keywords as keys and the argument values as
corresponding values), or a (new) empty dictionary if there were no
excess keyword arguments.
If the syntax "*expression" appears in the function call, "expression"
must evaluate to an *iterable*. Elements from these iterables are
treated as if they were additional positional arguments. For the call
"f(x1, x2, *y, x3, x4)", if *y* evaluates to a sequence *y1*, …, *yM*,
this is equivalent to a call with M+4 positional arguments *x1*, *x2*,
*y1*, …, *yM*, *x3*, *x4*.
A consequence of this is that although the "*expression" syntax may
appear *after* explicit keyword arguments, it is processed *before*
the keyword arguments (and any "**expression" arguments – see below).
So:
>>> def f(a, b):
... print(a, b)
...
>>> f(b=1, *(2,))
2 1
>>> f(a=1, *(2,))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: f() got multiple values for keyword argument 'a'
>>> f(1, *(2,))
1 2
It is unusual for both keyword arguments and the "*expression" syntax
to be used in the same call, so in practice this confusion does not
arise.
If the syntax "**expression" appears in the function call,
"expression" must evaluate to a *mapping*, the contents of which are
treated as additional keyword arguments. If a keyword is already
present (as an explicit keyword argument, or from another unpacking),
a "TypeError" exception is raised.
Formal parameters using the syntax "*identifier" or "**identifier"
cannot be used as positional argument slots or as keyword argument
names.
Changed in version 3.5: Function calls accept any number of "*" and
"**" unpackings, positional arguments may follow iterable unpackings
("*"), and keyword arguments may follow dictionary unpackings ("**").
Originally proposed by **PEP 448**.
A call always returns some value, possibly "None", unless it raises an
exception. How this value is computed depends on the type of the
callable object.
If it is—
a user-defined function:
The code block for the function is executed, passing it the
argument list. The first thing the code block will do is bind the
formal parameters to the arguments; this is described in section
Function definitions. When the code block executes a "return"
statement, this specifies the return value of the function call.
a built-in function or method:
The result is up to the interpreter; see Built-in Functions for the
descriptions of built-in functions and methods.
a class object:
A new instance of that class is returned.
a class instance method:
The corresponding user-defined function is called, with an argument
list that is one longer than the argument list of the call: the
instance becomes the first argument.
a class instance:
The class must define a "__call__()" method; the effect is then the
same as if that method was called.
u Class definitions
*****************
A class definition defines a class object (see section The standard
type hierarchy):
classdef ::= [decorators] "class" classname [inheritance] ":" suite
inheritance ::= "(" [argument_list] ")"
classname ::= identifier
A class definition is an executable statement. The inheritance list
usually gives a list of base classes (see Metaclasses for more
advanced uses), so each item in the list should evaluate to a class
object which allows subclassing. Classes without an inheritance list
inherit, by default, from the base class "object"; hence,
class Foo:
pass
is equivalent to
class Foo(object):
pass
The class’s suite is then executed in a new execution frame (see
Naming and binding), using a newly created local namespace and the
original global namespace. (Usually, the suite contains mostly
function definitions.) When the class’s suite finishes execution, its
execution frame is discarded but its local namespace is saved. [3] A
class object is then created using the inheritance list for the base
classes and the saved local namespace for the attribute dictionary.
The class name is bound to this class object in the original local
namespace.
The order in which attributes are defined in the class body is
preserved in the new class’s "__dict__". Note that this is reliable
only right after the class is created and only for classes that were
defined using the definition syntax.
Class creation can be customized heavily using metaclasses.
Classes can also be decorated: just like when decorating functions,
@f1(arg)
@f2
class Foo: pass
is roughly equivalent to
class Foo: pass
Foo = f1(arg)(f2(Foo))
The evaluation rules for the decorator expressions are the same as for
function decorators. The result is then bound to the class name.
**Programmer’s note:** Variables defined in the class definition are
class attributes; they are shared by instances. Instance attributes
can be set in a method with "self.name = value". Both class and
instance attributes are accessible through the notation “"self.name"”,
and an instance attribute hides a class attribute with the same name
when accessed in this way. Class attributes can be used as defaults
for instance attributes, but using mutable values there can lead to
unexpected results. Descriptors can be used to create instance
variables with different implementation details.
See also:
**PEP 3115** - Metaclasses in Python 3000
The proposal that changed the declaration of metaclasses to the
current syntax, and the semantics for how classes with
metaclasses are constructed.
**PEP 3129** - Class Decorators
The proposal that added class decorators. Function and method
decorators were introduced in **PEP 318**.
u�' Comparisons
***********
Unlike C, all comparison operations in Python have the same priority,
which is lower than that of any arithmetic, shifting or bitwise
operation. Also unlike C, expressions like "a < b < c" have the
interpretation that is conventional in mathematics:
comparison ::= or_expr (comp_operator or_expr)*
comp_operator ::= "<" | ">" | "==" | ">=" | "<=" | "!="
| "is" ["not"] | ["not"] "in"
Comparisons yield boolean values: "True" or "False".
Comparisons can be chained arbitrarily, e.g., "x < y <= z" is
equivalent to "x < y and y <= z", except that "y" is evaluated only
once (but in both cases "z" is not evaluated at all when "x < y" is
found to be false).
Formally, if *a*, *b*, *c*, …, *y*, *z* are expressions and *op1*,
*op2*, …, *opN* are comparison operators, then "a op1 b op2 c ... y
opN z" is equivalent to "a op1 b and b op2 c and ... y opN z", except
that each expression is evaluated at most once.
Note that "a op1 b op2 c" doesn’t imply any kind of comparison between
*a* and *c*, so that, e.g., "x < y > z" is perfectly legal (though
perhaps not pretty).
Value comparisons
=================
The operators "<", ">", "==", ">=", "<=", and "!=" compare the values
of two objects. The objects do not need to have the same type.
Chapter Objects, values and types states that objects have a value (in
addition to type and identity). The value of an object is a rather
abstract notion in Python: For example, there is no canonical access
method for an object’s value. Also, there is no requirement that the
value of an object should be constructed in a particular way, e.g.
comprised of all its data attributes. Comparison operators implement a
particular notion of what the value of an object is. One can think of
them as defining the value of an object indirectly, by means of their
comparison implementation.
Because all types are (direct or indirect) subtypes of "object", they
inherit the default comparison behavior from "object". Types can
customize their comparison behavior by implementing *rich comparison
methods* like "__lt__()", described in Basic customization.
The default behavior for equality comparison ("==" and "!=") is based
on the identity of the objects. Hence, equality comparison of
instances with the same identity results in equality, and equality
comparison of instances with different identities results in
inequality. A motivation for this default behavior is the desire that
all objects should be reflexive (i.e. "x is y" implies "x == y").
A default order comparison ("<", ">", "<=", and ">=") is not provided;
an attempt raises "TypeError". A motivation for this default behavior
is the lack of a similar invariant as for equality.
The behavior of the default equality comparison, that instances with
different identities are always unequal, may be in contrast to what
types will need that have a sensible definition of object value and
value-based equality. Such types will need to customize their
comparison behavior, and in fact, a number of built-in types have done
that.
The following list describes the comparison behavior of the most
important built-in types.
* Numbers of built-in numeric types (Numeric Types — int, float,
complex) and of the standard library types "fractions.Fraction" and
"decimal.Decimal" can be compared within and across their types,
with the restriction that complex numbers do not support order
comparison. Within the limits of the types involved, they compare
mathematically (algorithmically) correct without loss of precision.
The not-a-number values "float('NaN')" and "decimal.Decimal('NaN')"
are special. Any ordered comparison of a number to a not-a-number
value is false. A counter-intuitive implication is that not-a-number
values are not equal to themselves. For example, if "x =
float('NaN')", "3 < x", "x < 3" and "x == x" are all false, while "x
!= x" is true. This behavior is compliant with IEEE 754.
* "None" and "NotImplemented" are singletons. **PEP 8** advises that
comparisons for singletons should always be done with "is" or "is
not", never the equality operators.
* Binary sequences (instances of "bytes" or "bytearray") can be
compared within and across their types. They compare
lexicographically using the numeric values of their elements.
* Strings (instances of "str") compare lexicographically using the
numerical Unicode code points (the result of the built-in function
"ord()") of their characters. [3]
Strings and binary sequences cannot be directly compared.
* Sequences (instances of "tuple", "list", or "range") can be compared
only within each of their types, with the restriction that ranges do
not support order comparison. Equality comparison across these
types results in inequality, and ordering comparison across these
types raises "TypeError".
Sequences compare lexicographically using comparison of
corresponding elements. The built-in containers typically assume
identical objects are equal to themselves. That lets them bypass
equality tests for identical objects to improve performance and to
maintain their internal invariants.
Lexicographical comparison between built-in collections works as
follows:
* For two collections to compare equal, they must be of the same
type, have the same length, and each pair of corresponding
elements must compare equal (for example, "[1,2] == (1,2)" is
false because the type is not the same).
* Collections that support order comparison are ordered the same as
their first unequal elements (for example, "[1,2,x] <= [1,2,y]"
has the same value as "x <= y"). If a corresponding element does
not exist, the shorter collection is ordered first (for example,
"[1,2] < [1,2,3]" is true).
* Mappings (instances of "dict") compare equal if and only if they
have equal *(key, value)* pairs. Equality comparison of the keys and
values enforces reflexivity.
Order comparisons ("<", ">", "<=", and ">=") raise "TypeError".
* Sets (instances of "set" or "frozenset") can be compared within and
across their types.
They define order comparison operators to mean subset and superset
tests. Those relations do not define total orderings (for example,
the two sets "{1,2}" and "{2,3}" are not equal, nor subsets of one
another, nor supersets of one another). Accordingly, sets are not
appropriate arguments for functions which depend on total ordering
(for example, "min()", "max()", and "sorted()" produce undefined
results given a list of sets as inputs).
Comparison of sets enforces reflexivity of its elements.
* Most other built-in types have no comparison methods implemented, so
they inherit the default comparison behavior.
User-defined classes that customize their comparison behavior should
follow some consistency rules, if possible:
* Equality comparison should be reflexive. In other words, identical
objects should compare equal:
"x is y" implies "x == y"
* Comparison should be symmetric. In other words, the following
expressions should have the same result:
"x == y" and "y == x"
"x != y" and "y != x"
"x < y" and "y > x"
"x <= y" and "y >= x"
* Comparison should be transitive. The following (non-exhaustive)
examples illustrate that:
"x > y and y > z" implies "x > z"
"x < y and y <= z" implies "x < z"
* Inverse comparison should result in the boolean negation. In other
words, the following expressions should have the same result:
"x == y" and "not x != y"
"x < y" and "not x >= y" (for total ordering)
"x > y" and "not x <= y" (for total ordering)
The last two expressions apply to totally ordered collections (e.g.
to sequences, but not to sets or mappings). See also the
"total_ordering()" decorator.
* The "hash()" result should be consistent with equality. Objects that
are equal should either have the same hash value, or be marked as
unhashable.
Python does not enforce these consistency rules. In fact, the
not-a-number values are an example for not following these rules.
Membership test operations
==========================
The operators "in" and "not in" test for membership. "x in s"
evaluates to "True" if *x* is a member of *s*, and "False" otherwise.
"x not in s" returns the negation of "x in s". All built-in sequences
and set types support this as well as dictionary, for which "in" tests
whether the dictionary has a given key. For container types such as
list, tuple, set, frozenset, dict, or collections.deque, the
expression "x in y" is equivalent to "any(x is e or x == e for e in
y)".
For the string and bytes types, "x in y" is "True" if and only if *x*
is a substring of *y*. An equivalent test is "y.find(x) != -1".
Empty strings are always considered to be a substring of any other
string, so """ in "abc"" will return "True".
For user-defined classes which define the "__contains__()" method, "x
in y" returns "True" if "y.__contains__(x)" returns a true value, and
"False" otherwise.
For user-defined classes which do not define "__contains__()" but do
define "__iter__()", "x in y" is "True" if some value "z", for which
the expression "x is z or x == z" is true, is produced while iterating
over "y". If an exception is raised during the iteration, it is as if
"in" raised that exception.
Lastly, the old-style iteration protocol is tried: if a class defines
"__getitem__()", "x in y" is "True" if and only if there is a non-
negative integer index *i* such that "x is y[i] or x == y[i]", and no
lower integer index raises the "IndexError" exception. (If any other
exception is raised, it is as if "in" raised that exception).
The operator "not in" is defined to have the inverse truth value of
"in".
Identity comparisons
====================
The operators "is" and "is not" test for an object’s identity: "x is
y" is true if and only if *x* and *y* are the same object. An
Object’s identity is determined using the "id()" function. "x is not
y" yields the inverse truth value. [4]
u�l Compound statements
*******************
Compound statements contain (groups of) other statements; they affect
or control the execution of those other statements in some way. In
general, compound statements span multiple lines, although in simple
incarnations a whole compound statement may be contained in one line.
The "if", "while" and "for" statements implement traditional control
flow constructs. "try" specifies exception handlers and/or cleanup
code for a group of statements, while the "with" statement allows the
execution of initialization and finalization code around a block of
code. Function and class definitions are also syntactically compound
statements.
A compound statement consists of one or more ‘clauses.’ A clause
consists of a header and a ‘suite.’ The clause headers of a
particular compound statement are all at the same indentation level.
Each clause header begins with a uniquely identifying keyword and ends
with a colon. A suite is a group of statements controlled by a
clause. A suite can be one or more semicolon-separated simple
statements on the same line as the header, following the header’s
colon, or it can be one or more indented statements on subsequent
lines. Only the latter form of a suite can contain nested compound
statements; the following is illegal, mostly because it wouldn’t be
clear to which "if" clause a following "else" clause would belong:
if test1: if test2: print(x)
Also note that the semicolon binds tighter than the colon in this
context, so that in the following example, either all or none of the
"print()" calls are executed:
if x < y < z: print(x); print(y); print(z)
Summarizing:
compound_stmt ::= if_stmt
| while_stmt
| for_stmt
| try_stmt
| with_stmt
| funcdef
| classdef
| async_with_stmt
| async_for_stmt
| async_funcdef
suite ::= stmt_list NEWLINE | NEWLINE INDENT statement+ DEDENT
statement ::= stmt_list NEWLINE | compound_stmt
stmt_list ::= simple_stmt (";" simple_stmt)* [";"]
Note that statements always end in a "NEWLINE" possibly followed by a
"DEDENT". Also note that optional continuation clauses always begin
with a keyword that cannot start a statement, thus there are no
ambiguities (the ‘dangling "else"’ problem is solved in Python by
requiring nested "if" statements to be indented).
The formatting of the grammar rules in the following sections places
each clause on a separate line for clarity.
The "if" statement
==================
The "if" statement is used for conditional execution:
if_stmt ::= "if" assignment_expression ":" suite
("elif" assignment_expression ":" suite)*
["else" ":" suite]
It selects exactly one of the suites by evaluating the expressions one
by one until one is found to be true (see section Boolean operations
for the definition of true and false); then that suite is executed
(and no other part of the "if" statement is executed or evaluated).
If all expressions are false, the suite of the "else" clause, if
present, is executed.
The "while" statement
=====================
The "while" statement is used for repeated execution as long as an
expression is true:
while_stmt ::= "while" assignment_expression ":" suite
["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the
first suite; if the expression is false (which may be the first time
it is tested) the suite of the "else" clause, if present, is executed
and the loop terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and goes back
to testing the expression.
The "for" statement
===================
The "for" statement is used to iterate over the elements of a sequence
(such as a string, tuple or list) or other iterable object:
for_stmt ::= "for" target_list "in" expression_list ":" suite
["else" ":" suite]
The expression list is evaluated once; it should yield an iterable
object. An iterator is created for the result of the
"expression_list". The suite is then executed once for each item
provided by the iterator, in the order returned by the iterator. Each
item in turn is assigned to the target list using the standard rules
for assignments (see Assignment statements), and then the suite is
executed. When the items are exhausted (which is immediately when the
sequence is empty or an iterator raises a "StopIteration" exception),
the suite in the "else" clause, if present, is executed, and the loop
terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and continues
with the next item, or with the "else" clause if there is no next
item.
The for-loop makes assignments to the variables in the target list.
This overwrites all previous assignments to those variables including
those made in the suite of the for-loop:
for i in range(10):
print(i)
i = 5 # this will not affect the for-loop
# because i will be overwritten with the next
# index in the range
Names in the target list are not deleted when the loop is finished,
but if the sequence is empty, they will not have been assigned to at
all by the loop. Hint: the built-in function "range()" returns an
iterator of integers suitable to emulate the effect of Pascal’s "for i
:= a to b do"; e.g., "list(range(3))" returns the list "[0, 1, 2]".
Note:
There is a subtlety when the sequence is being modified by the loop
(this can only occur for mutable sequences, e.g. lists). An
internal counter is used to keep track of which item is used next,
and this is incremented on each iteration. When this counter has
reached the length of the sequence the loop terminates. This means
that if the suite deletes the current (or a previous) item from the
sequence, the next item will be skipped (since it gets the index of
the current item which has already been treated). Likewise, if the
suite inserts an item in the sequence before the current item, the
current item will be treated again the next time through the loop.
This can lead to nasty bugs that can be avoided by making a
temporary copy using a slice of the whole sequence, e.g.,
for x in a[:]:
if x < 0: a.remove(x)
The "try" statement
===================
The "try" statement specifies exception handlers and/or cleanup code
for a group of statements:
try_stmt ::= try1_stmt | try2_stmt
try1_stmt ::= "try" ":" suite
("except" [expression ["as" identifier]] ":" suite)+
["else" ":" suite]
["finally" ":" suite]
try2_stmt ::= "try" ":" suite
"finally" ":" suite
The "except" clause(s) specify one or more exception handlers. When no
exception occurs in the "try" clause, no exception handler is
executed. When an exception occurs in the "try" suite, a search for an
exception handler is started. This search inspects the except clauses
in turn until one is found that matches the exception. An expression-
less except clause, if present, must be last; it matches any
exception. For an except clause with an expression, that expression
is evaluated, and the clause matches the exception if the resulting
object is “compatible” with the exception. An object is compatible
with an exception if it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base
class of the exception object.
If no except clause matches the exception, the search for an exception
handler continues in the surrounding code and on the invocation stack.
[1]
If the evaluation of an expression in the header of an except clause
raises an exception, the original search for a handler is canceled and
a search starts for the new exception in the surrounding code and on
the call stack (it is treated as if the entire "try" statement raised
the exception).
When a matching except clause is found, the exception is assigned to
the target specified after the "as" keyword in that except clause, if
present, and the except clause’s suite is executed. All except
clauses must have an executable block. When the end of this block is
reached, execution continues normally after the entire try statement.
(This means that if two nested handlers exist for the same exception,
and the exception occurs in the try clause of the inner handler, the
outer handler will not handle the exception.)
When an exception has been assigned using "as target", it is cleared
at the end of the except clause. This is as if
except E as N:
foo
was translated to
except E as N:
try:
foo
finally:
del N
This means the exception must be assigned to a different name to be
able to refer to it after the except clause. Exceptions are cleared
because with the traceback attached to them, they form a reference
cycle with the stack frame, keeping all locals in that frame alive
until the next garbage collection occurs.
Before an except clause’s suite is executed, details about the
exception are stored in the "sys" module and can be accessed via
"sys.exc_info()". "sys.exc_info()" returns a 3-tuple consisting of the
exception class, the exception instance and a traceback object (see
section The standard type hierarchy) identifying the point in the
program where the exception occurred. "sys.exc_info()" values are
restored to their previous values (before the call) when returning
from a function that handled an exception.
The optional "else" clause is executed if the control flow leaves the
"try" suite, no exception was raised, and no "return", "continue", or
"break" statement was executed. Exceptions in the "else" clause are
not handled by the preceding "except" clauses.
If "finally" is present, it specifies a ‘cleanup’ handler. The "try"
clause is executed, including any "except" and "else" clauses. If an
exception occurs in any of the clauses and is not handled, the
exception is temporarily saved. The "finally" clause is executed. If
there is a saved exception it is re-raised at the end of the "finally"
clause. If the "finally" clause raises another exception, the saved
exception is set as the context of the new exception. If the "finally"
clause executes a "return", "break" or "continue" statement, the saved
exception is discarded:
>>> def f():
... try:
... 1/0
... finally:
... return 42
...
>>> f()
42
The exception information is not available to the program during
execution of the "finally" clause.
When a "return", "break" or "continue" statement is executed in the
"try" suite of a "try"…"finally" statement, the "finally" clause is
also executed ‘on the way out.’
The return value of a function is determined by the last "return"
statement executed. Since the "finally" clause always executes, a
"return" statement executed in the "finally" clause will always be the
last one executed:
>>> def foo():
... try:
... return 'try'
... finally:
... return 'finally'
...
>>> foo()
'finally'
Additional information on exceptions can be found in section
Exceptions, and information on using the "raise" statement to generate
exceptions may be found in section The raise statement.
Changed in version 3.8: Prior to Python 3.8, a "continue" statement
was illegal in the "finally" clause due to a problem with the
implementation.
The "with" statement
====================
The "with" statement is used to wrap the execution of a block with
methods defined by a context manager (see section With Statement
Context Managers). This allows common "try"…"except"…"finally" usage
patterns to be encapsulated for convenient reuse.
with_stmt ::= "with" with_item ("," with_item)* ":" suite
with_item ::= expression ["as" target]
The execution of the "with" statement with one “item” proceeds as
follows:
1. The context expression (the expression given in the "with_item") is
evaluated to obtain a context manager.
2. The context manager’s "__enter__()" is loaded for later use.
3. The context manager’s "__exit__()" is loaded for later use.
4. The context manager’s "__enter__()" method is invoked.
5. If a target was included in the "with" statement, the return value
from "__enter__()" is assigned to it.
Note:
The "with" statement guarantees that if the "__enter__()" method
returns without an error, then "__exit__()" will always be
called. Thus, if an error occurs during the assignment to the
target list, it will be treated the same as an error occurring
within the suite would be. See step 6 below.
6. The suite is executed.
7. The context manager’s "__exit__()" method is invoked. If an
exception caused the suite to be exited, its type, value, and
traceback are passed as arguments to "__exit__()". Otherwise, three
"None" arguments are supplied.
If the suite was exited due to an exception, and the return value
from the "__exit__()" method was false, the exception is reraised.
If the return value was true, the exception is suppressed, and
execution continues with the statement following the "with"
statement.
If the suite was exited for any reason other than an exception, the
return value from "__exit__()" is ignored, and execution proceeds
at the normal location for the kind of exit that was taken.
The following code:
with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
With more than one item, the context managers are processed as if
multiple "with" statements were nested:
with A() as a, B() as b:
SUITE
is semantically equivalent to:
with A() as a:
with B() as b:
SUITE
Changed in version 3.1: Support for multiple context expressions.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
Function definitions
====================
A function definition defines a user-defined function object (see
section The standard type hierarchy):
funcdef ::= [decorators] "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
decorators ::= decorator+
decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name ::= identifier ("." identifier)*
parameter_list ::= defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]]
| parameter_list_no_posonly
parameter_list_no_posonly ::= defparameter ("," defparameter)* ["," [parameter_list_starargs]]
| parameter_list_starargs
parameter_list_starargs ::= "*" [parameter] ("," defparameter)* ["," ["**" parameter [","]]]
| "**" parameter [","]
parameter ::= identifier [":" expression]
defparameter ::= parameter ["=" expression]
funcname ::= identifier
A function definition is an executable statement. Its execution binds
the function name in the current local namespace to a function object
(a wrapper around the executable code for the function). This
function object contains a reference to the current global namespace
as the global namespace to be used when the function is called.
The function definition does not execute the function body; this gets
executed only when the function is called. [2]
A function definition may be wrapped by one or more *decorator*
expressions. Decorator expressions are evaluated when the function is
defined, in the scope that contains the function definition. The
result must be a callable, which is invoked with the function object
as the only argument. The returned value is bound to the function name
instead of the function object. Multiple decorators are applied in
nested fashion. For example, the following code
@f1(arg)
@f2
def func(): pass
is roughly equivalent to
def func(): pass
func = f1(arg)(f2(func))
except that the original function is not temporarily bound to the name
"func".
When one or more *parameters* have the form *parameter* "="
*expression*, the function is said to have “default parameter values.”
For a parameter with a default value, the corresponding *argument* may
be omitted from a call, in which case the parameter’s default value is
substituted. If a parameter has a default value, all following
parameters up until the “"*"” must also have a default value — this is
a syntactic restriction that is not expressed by the grammar.
**Default parameter values are evaluated from left to right when the
function definition is executed.** This means that the expression is
evaluated once, when the function is defined, and that the same “pre-
computed” value is used for each call. This is especially important
to understand when a default parameter is a mutable object, such as a
list or a dictionary: if the function modifies the object (e.g. by
appending an item to a list), the default value is in effect modified.
This is generally not what was intended. A way around this is to use
"None" as the default, and explicitly test for it in the body of the
function, e.g.:
def whats_on_the_telly(penguin=None):
if penguin is None:
penguin = []
penguin.append("property of the zoo")
return penguin
Function call semantics are described in more detail in section Calls.
A function call always assigns values to all parameters mentioned in
the parameter list, either from positional arguments, from keyword
arguments, or from default values. If the form “"*identifier"” is
present, it is initialized to a tuple receiving any excess positional
parameters, defaulting to the empty tuple. If the form
“"**identifier"” is present, it is initialized to a new ordered
mapping receiving any excess keyword arguments, defaulting to a new
empty mapping of the same type. Parameters after “"*"” or
“"*identifier"” are keyword-only parameters and may only be passed by
keyword arguments. Parameters before “"/"” are positional-only
parameters and may only be passed by positional arguments.
Changed in version 3.8: The "/" function parameter syntax may be used
to indicate positional-only parameters. See **PEP 570** for details.
Parameters may have an *annotation* of the form “": expression"”
following the parameter name. Any parameter may have an annotation,
even those of the form "*identifier" or "**identifier". Functions may
have “return” annotation of the form “"-> expression"” after the
parameter list. These annotations can be any valid Python expression.
The presence of annotations does not change the semantics of a
function. The annotation values are available as values of a
dictionary keyed by the parameters’ names in the "__annotations__"
attribute of the function object. If the "annotations" import from
"__future__" is used, annotations are preserved as strings at runtime
which enables postponed evaluation. Otherwise, they are evaluated
when the function definition is executed. In this case annotations
may be evaluated in a different order than they appear in the source
code.
It is also possible to create anonymous functions (functions not bound
to a name), for immediate use in expressions. This uses lambda
expressions, described in section Lambdas. Note that the lambda
expression is merely a shorthand for a simplified function definition;
a function defined in a “"def"” statement can be passed around or
assigned to another name just like a function defined by a lambda
expression. The “"def"” form is actually more powerful since it
allows the execution of multiple statements and annotations.
**Programmer’s note:** Functions are first-class objects. A “"def"”
statement executed inside a function definition defines a local
function that can be returned or passed around. Free variables used
in the nested function can access the local variables of the function
containing the def. See section Naming and binding for details.
See also:
**PEP 3107** - Function Annotations
The original specification for function annotations.
**PEP 484** - Type Hints
Definition of a standard meaning for annotations: type hints.
**PEP 526** - Syntax for Variable Annotations
Ability to type hint variable declarations, including class
variables and instance variables
**PEP 563** - Postponed Evaluation of Annotations
Support for forward references within annotations by preserving
annotations in a string form at runtime instead of eager
evaluation.
Class definitions
=================
A class definition defines a class object (see section The standard
type hierarchy):
classdef ::= [decorators] "class" classname [inheritance] ":" suite
inheritance ::= "(" [argument_list] ")"
classname ::= identifier
A class definition is an executable statement. The inheritance list
usually gives a list of base classes (see Metaclasses for more
advanced uses), so each item in the list should evaluate to a class
object which allows subclassing. Classes without an inheritance list
inherit, by default, from the base class "object"; hence,
class Foo:
pass
is equivalent to
class Foo(object):
pass
The class’s suite is then executed in a new execution frame (see
Naming and binding), using a newly created local namespace and the
original global namespace. (Usually, the suite contains mostly
function definitions.) When the class’s suite finishes execution, its
execution frame is discarded but its local namespace is saved. [3] A
class object is then created using the inheritance list for the base
classes and the saved local namespace for the attribute dictionary.
The class name is bound to this class object in the original local
namespace.
The order in which attributes are defined in the class body is
preserved in the new class’s "__dict__". Note that this is reliable
only right after the class is created and only for classes that were
defined using the definition syntax.
Class creation can be customized heavily using metaclasses.
Classes can also be decorated: just like when decorating functions,
@f1(arg)
@f2
class Foo: pass
is roughly equivalent to
class Foo: pass
Foo = f1(arg)(f2(Foo))
The evaluation rules for the decorator expressions are the same as for
function decorators. The result is then bound to the class name.
**Programmer’s note:** Variables defined in the class definition are
class attributes; they are shared by instances. Instance attributes
can be set in a method with "self.name = value". Both class and
instance attributes are accessible through the notation “"self.name"”,
and an instance attribute hides a class attribute with the same name
when accessed in this way. Class attributes can be used as defaults
for instance attributes, but using mutable values there can lead to
unexpected results. Descriptors can be used to create instance
variables with different implementation details.
See also:
**PEP 3115** - Metaclasses in Python 3000
The proposal that changed the declaration of metaclasses to the
current syntax, and the semantics for how classes with
metaclasses are constructed.
**PEP 3129** - Class Decorators
The proposal that added class decorators. Function and method
decorators were introduced in **PEP 318**.
Coroutines
==========
New in version 3.5.
Coroutine function definition
-----------------------------
async_funcdef ::= [decorators] "async" "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
Execution of Python coroutines can be suspended and resumed at many
points (see *coroutine*). Inside the body of a coroutine function,
"await" and "async" identifiers become reserved keywords; "await"
expressions, "async for" and "async with" can only be used in
coroutine function bodies.
Functions defined with "async def" syntax are always coroutine
functions, even if they do not contain "await" or "async" keywords.
It is a "SyntaxError" to use a "yield from" expression inside the body
of a coroutine function.
An example of a coroutine function:
async def func(param1, param2):
do_stuff()
await some_coroutine()
The "async for" statement
-------------------------
async_for_stmt ::= "async" for_stmt
An *asynchronous iterable* is able to call asynchronous code in its
*iter* implementation, and *asynchronous iterator* can call
asynchronous code in its *next* method.
The "async for" statement allows convenient iteration over
asynchronous iterators.
The following code:
async for TARGET in ITER:
SUITE
else:
SUITE2
Is semantically equivalent to:
iter = (ITER)
iter = type(iter).__aiter__(iter)
running = True
while running:
try:
TARGET = await type(iter).__anext__(iter)
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2
See also "__aiter__()" and "__anext__()" for details.
It is a "SyntaxError" to use an "async for" statement outside the body
of a coroutine function.
The "async with" statement
--------------------------
async_with_stmt ::= "async" with_stmt
An *asynchronous context manager* is a *context manager* that is able
to suspend execution in its *enter* and *exit* methods.
The following code:
async with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
aexit = type(manager).__aexit__
aenter = type(manager).__aenter__
value = await aenter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
See also "__aenter__()" and "__aexit__()" for details.
It is a "SyntaxError" to use an "async with" statement outside the
body of a coroutine function.
See also:
**PEP 492** - Coroutines with async and await syntax
The proposal that made coroutines a proper standalone concept in
Python, and added supporting syntax.
-[ Footnotes ]-
[1] The exception is propagated to the invocation stack unless there
is a "finally" clause which happens to raise another exception.
That new exception causes the old one to be lost.
[2] A string literal appearing as the first statement in the function
body is transformed into the function’s "__doc__" attribute and
therefore the function’s *docstring*.
[3] A string literal appearing as the first statement in the class
body is transformed into the namespace’s "__doc__" item and
therefore the class’s *docstring*.
u� With Statement Context Managers
*******************************
A *context manager* is an object that defines the runtime context to
be established when executing a "with" statement. The context manager
handles the entry into, and the exit from, the desired runtime context
for the execution of the block of code. Context managers are normally
invoked using the "with" statement (described in section The with
statement), but can also be used by directly invoking their methods.
Typical uses of context managers include saving and restoring various
kinds of global state, locking and unlocking resources, closing opened
files, etc.
For more information on context managers, see Context Manager Types.
object.__enter__(self)
Enter the runtime context related to this object. The "with"
statement will bind this method’s return value to the target(s)
specified in the "as" clause of the statement, if any.
object.__exit__(self, exc_type, exc_value, traceback)
Exit the runtime context related to this object. The parameters
describe the exception that caused the context to be exited. If the
context was exited without an exception, all three arguments will
be "None".
If an exception is supplied, and the method wishes to suppress the
exception (i.e., prevent it from being propagated), it should
return a true value. Otherwise, the exception will be processed
normally upon exit from this method.
Note that "__exit__()" methods should not reraise the passed-in
exception; this is the caller’s responsibility.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
a� The "continue" statement
************************
continue_stmt ::= "continue"
"continue" may only occur syntactically nested in a "for" or "while"
loop, but not nested in a function or class definition within that
loop. It continues with the next cycle of the nearest enclosing loop.
When "continue" passes control out of a "try" statement with a
"finally" clause, that "finally" clause is executed before really
starting the next loop cycle.
u� Arithmetic conversions
**********************
When a description of an arithmetic operator below uses the phrase
“the numeric arguments are converted to a common type”, this means
that the operator implementation for built-in types works as follows:
* If either argument is a complex number, the other is converted to
complex;
* otherwise, if either argument is a floating point number, the other
is converted to floating point;
* otherwise, both must be integers and no conversion is necessary.
Some additional rules apply for certain operators (e.g., a string as a
left argument to the ‘%’ operator). Extensions must define their own
conversion behavior.
uS5 Basic customization
*******************
object.__new__(cls[, ...])
Called to create a new instance of class *cls*. "__new__()" is a
static method (special-cased so you need not declare it as such)
that takes the class of which an instance was requested as its
first argument. The remaining arguments are those passed to the
object constructor expression (the call to the class). The return
value of "__new__()" should be the new object instance (usually an
instance of *cls*).
Typical implementations create a new instance of the class by
invoking the superclass’s "__new__()" method using
"super().__new__(cls[, ...])" with appropriate arguments and then
modifying the newly-created instance as necessary before returning
it.
If "__new__()" is invoked during object construction and it returns
an instance of *cls*, then the new instance’s "__init__()" method
will be invoked like "__init__(self[, ...])", where *self* is the
new instance and the remaining arguments are the same as were
passed to the object constructor.
If "__new__()" does not return an instance of *cls*, then the new
instance’s "__init__()" method will not be invoked.
"__new__()" is intended mainly to allow subclasses of immutable
types (like int, str, or tuple) to customize instance creation. It
is also commonly overridden in custom metaclasses in order to
customize class creation.
object.__init__(self[, ...])
Called after the instance has been created (by "__new__()"), but
before it is returned to the caller. The arguments are those
passed to the class constructor expression. If a base class has an
"__init__()" method, the derived class’s "__init__()" method, if
any, must explicitly call it to ensure proper initialization of the
base class part of the instance; for example:
"super().__init__([args...])".
Because "__new__()" and "__init__()" work together in constructing
objects ("__new__()" to create it, and "__init__()" to customize
it), no non-"None" value may be returned by "__init__()"; doing so
will cause a "TypeError" to be raised at runtime.
object.__del__(self)
Called when the instance is about to be destroyed. This is also
called a finalizer or (improperly) a destructor. If a base class
has a "__del__()" method, the derived class’s "__del__()" method,
if any, must explicitly call it to ensure proper deletion of the
base class part of the instance.
It is possible (though not recommended!) for the "__del__()" method
to postpone destruction of the instance by creating a new reference
to it. This is called object *resurrection*. It is
implementation-dependent whether "__del__()" is called a second
time when a resurrected object is about to be destroyed; the
current *CPython* implementation only calls it once.
It is not guaranteed that "__del__()" methods are called for
objects that still exist when the interpreter exits.
Note:
"del x" doesn’t directly call "x.__del__()" — the former
decrements the reference count for "x" by one, and the latter is
only called when "x"’s reference count reaches zero.
**CPython implementation detail:** It is possible for a reference
cycle to prevent the reference count of an object from going to
zero. In this case, the cycle will be later detected and deleted
by the *cyclic garbage collector*. A common cause of reference
cycles is when an exception has been caught in a local variable.
The frame’s locals then reference the exception, which references
its own traceback, which references the locals of all frames caught
in the traceback.
See also: Documentation for the "gc" module.
Warning:
Due to the precarious circumstances under which "__del__()"
methods are invoked, exceptions that occur during their execution
are ignored, and a warning is printed to "sys.stderr" instead.
In particular:
* "__del__()" can be invoked when arbitrary code is being
executed, including from any arbitrary thread. If "__del__()"
needs to take a lock or invoke any other blocking resource, it
may deadlock as the resource may already be taken by the code
that gets interrupted to execute "__del__()".
* "__del__()" can be executed during interpreter shutdown. As a
consequence, the global variables it needs to access (including
other modules) may already have been deleted or set to "None".
Python guarantees that globals whose name begins with a single
underscore are deleted from their module before other globals
are deleted; if no other references to such globals exist, this
may help in assuring that imported modules are still available
at the time when the "__del__()" method is called.
object.__repr__(self)
Called by the "repr()" built-in function to compute the “official”
string representation of an object. If at all possible, this
should look like a valid Python expression that could be used to
recreate an object with the same value (given an appropriate
environment). If this is not possible, a string of the form
"<...some useful description...>" should be returned. The return
value must be a string object. If a class defines "__repr__()" but
not "__str__()", then "__repr__()" is also used when an “informal”
string representation of instances of that class is required.
This is typically used for debugging, so it is important that the
representation is information-rich and unambiguous.
object.__str__(self)
Called by "str(object)" and the built-in functions "format()" and
"print()" to compute the “informal” or nicely printable string
representation of an object. The return value must be a string
object.
This method differs from "object.__repr__()" in that there is no
expectation that "__str__()" return a valid Python expression: a
more convenient or concise representation can be used.
The default implementation defined by the built-in type "object"
calls "object.__repr__()".
object.__bytes__(self)
Called by bytes to compute a byte-string representation of an
object. This should return a "bytes" object.
object.__format__(self, format_spec)
Called by the "format()" built-in function, and by extension,
evaluation of formatted string literals and the "str.format()"
method, to produce a “formatted” string representation of an
object. The *format_spec* argument is a string that contains a
description of the formatting options desired. The interpretation
of the *format_spec* argument is up to the type implementing
"__format__()", however most classes will either delegate
formatting to one of the built-in types, or use a similar
formatting option syntax.
See Format Specification Mini-Language for a description of the
standard formatting syntax.
The return value must be a string object.
Changed in version 3.4: The __format__ method of "object" itself
raises a "TypeError" if passed any non-empty string.
Changed in version 3.7: "object.__format__(x, '')" is now
equivalent to "str(x)" rather than "format(str(self), '')".
object.__lt__(self, other)
object.__le__(self, other)
object.__eq__(self, other)
object.__ne__(self, other)
object.__gt__(self, other)
object.__ge__(self, other)
These are the so-called “rich comparison” methods. The
correspondence between operator symbols and method names is as
follows: "x<y" calls "x.__lt__(y)", "x<=y" calls "x.__le__(y)",
"x==y" calls "x.__eq__(y)", "x!=y" calls "x.__ne__(y)", "x>y" calls
"x.__gt__(y)", and "x>=y" calls "x.__ge__(y)".
A rich comparison method may return the singleton "NotImplemented"
if it does not implement the operation for a given pair of
arguments. By convention, "False" and "True" are returned for a
successful comparison. However, these methods can return any value,
so if the comparison operator is used in a Boolean context (e.g.,
in the condition of an "if" statement), Python will call "bool()"
on the value to determine if the result is true or false.
By default, "object" implements "__eq__()" by using "is", returning
"NotImplemented" in the case of a false comparison: "True if x is y
else NotImplemented". For "__ne__()", by default it delegates to
"__eq__()" and inverts the result unless it is "NotImplemented".
There are no other implied relationships among the comparison
operators or default implementations; for example, the truth of
"(x<y or x==y)" does not imply "x<=y". To automatically generate
ordering operations from a single root operation, see
"functools.total_ordering()".
See the paragraph on "__hash__()" for some important notes on
creating *hashable* objects which support custom comparison
operations and are usable as dictionary keys.
There are no swapped-argument versions of these methods (to be used
when the left argument does not support the operation but the right
argument does); rather, "__lt__()" and "__gt__()" are each other’s
reflection, "__le__()" and "__ge__()" are each other’s reflection,
and "__eq__()" and "__ne__()" are their own reflection. If the
operands are of different types, and right operand’s type is a
direct or indirect subclass of the left operand’s type, the
reflected method of the right operand has priority, otherwise the
left operand’s method has priority. Virtual subclassing is not
considered.
object.__hash__(self)
Called by built-in function "hash()" and for operations on members
of hashed collections including "set", "frozenset", and "dict".
"__hash__()" should return an integer. The only required property
is that objects which compare equal have the same hash value; it is
advised to mix together the hash values of the components of the
object that also play a part in comparison of objects by packing
them into a tuple and hashing the tuple. Example:
def __hash__(self):
return hash((self.name, self.nick, self.color))
Note:
"hash()" truncates the value returned from an object’s custom
"__hash__()" method to the size of a "Py_ssize_t". This is
typically 8 bytes on 64-bit builds and 4 bytes on 32-bit builds.
If an object’s "__hash__()" must interoperate on builds of
different bit sizes, be sure to check the width on all supported
builds. An easy way to do this is with "python -c "import sys;
print(sys.hash_info.width)"".
If a class does not define an "__eq__()" method it should not
define a "__hash__()" operation either; if it defines "__eq__()"
but not "__hash__()", its instances will not be usable as items in
hashable collections. If a class defines mutable objects and
implements an "__eq__()" method, it should not implement
"__hash__()", since the implementation of hashable collections
requires that a key’s hash value is immutable (if the object’s hash
value changes, it will be in the wrong hash bucket).
User-defined classes have "__eq__()" and "__hash__()" methods by
default; with them, all objects compare unequal (except with
themselves) and "x.__hash__()" returns an appropriate value such
that "x == y" implies both that "x is y" and "hash(x) == hash(y)".
A class that overrides "__eq__()" and does not define "__hash__()"
will have its "__hash__()" implicitly set to "None". When the
"__hash__()" method of a class is "None", instances of the class
will raise an appropriate "TypeError" when a program attempts to
retrieve their hash value, and will also be correctly identified as
unhashable when checking "isinstance(obj,
collections.abc.Hashable)".
If a class that overrides "__eq__()" needs to retain the
implementation of "__hash__()" from a parent class, the interpreter
must be told this explicitly by setting "__hash__ =
<ParentClass>.__hash__".
If a class that does not override "__eq__()" wishes to suppress
hash support, it should include "__hash__ = None" in the class
definition. A class which defines its own "__hash__()" that
explicitly raises a "TypeError" would be incorrectly identified as
hashable by an "isinstance(obj, collections.abc.Hashable)" call.
Note:
By default, the "__hash__()" values of str and bytes objects are
“salted” with an unpredictable random value. Although they
remain constant within an individual Python process, they are not
predictable between repeated invocations of Python.This is
intended to provide protection against a denial-of-service caused
by carefully-chosen inputs that exploit the worst case
performance of a dict insertion, O(n^2) complexity. See
http://www.ocert.org/advisories/ocert-2011-003.html for
details.Changing hash values affects the iteration order of sets.
Python has never made guarantees about this ordering (and it
typically varies between 32-bit and 64-bit builds).See also
"PYTHONHASHSEED".
Changed in version 3.3: Hash randomization is enabled by default.
object.__bool__(self)
Called to implement truth value testing and the built-in operation
"bool()"; should return "False" or "True". When this method is not
defined, "__len__()" is called, if it is defined, and the object is
considered true if its result is nonzero. If a class defines
neither "__len__()" nor "__bool__()", all its instances are
considered true.
u�I "pdb" — The Python Debugger
***************************
**Source code:** Lib/pdb.py
======================================================================
The module "pdb" defines an interactive source code debugger for
Python programs. It supports setting (conditional) breakpoints and
single stepping at the source line level, inspection of stack frames,
source code listing, and evaluation of arbitrary Python code in the
context of any stack frame. It also supports post-mortem debugging
and can be called under program control.
The debugger is extensible – it is actually defined as the class
"Pdb". This is currently undocumented but easily understood by reading
the source. The extension interface uses the modules "bdb" and "cmd".
The debugger’s prompt is "(Pdb)". Typical usage to run a program under
control of the debugger is:
>>> import pdb
>>> import mymodule
>>> pdb.run('mymodule.test()')
> <string>(0)?()
(Pdb) continue
> <string>(1)?()
(Pdb) continue
NameError: 'spam'
> <string>(1)?()
(Pdb)
Changed in version 3.3: Tab-completion via the "readline" module is
available for commands and command arguments, e.g. the current global
and local names are offered as arguments of the "p" command.
"pdb.py" can also be invoked as a script to debug other scripts. For
example:
python3 -m pdb myscript.py
When invoked as a script, pdb will automatically enter post-mortem
debugging if the program being debugged exits abnormally. After post-
mortem debugging (or after normal exit of the program), pdb will
restart the program. Automatic restarting preserves pdb’s state (such
as breakpoints) and in most cases is more useful than quitting the
debugger upon program’s exit.
New in version 3.2: "pdb.py" now accepts a "-c" option that executes
commands as if given in a ".pdbrc" file, see Debugger Commands.
New in version 3.7: "pdb.py" now accepts a "-m" option that execute
modules similar to the way "python3 -m" does. As with a script, the
debugger will pause execution just before the first line of the
module.
The typical usage to break into the debugger from a running program is
to insert
import pdb; pdb.set_trace()
at the location you want to break into the debugger. You can then
step through the code following this statement, and continue running
without the debugger using the "continue" command.
New in version 3.7: The built-in "breakpoint()", when called with
defaults, can be used instead of "import pdb; pdb.set_trace()".
The typical usage to inspect a crashed program is:
>>> import pdb
>>> import mymodule
>>> mymodule.test()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "./mymodule.py", line 4, in test
test2()
File "./mymodule.py", line 3, in test2
print(spam)
NameError: spam
>>> pdb.pm()
> ./mymodule.py(3)test2()
-> print(spam)
(Pdb)
The module defines the following functions; each enters the debugger
in a slightly different way:
pdb.run(statement, globals=None, locals=None)
Execute the *statement* (given as a string or a code object) under
debugger control. The debugger prompt appears before any code is
executed; you can set breakpoints and type "continue", or you can
step through the statement using "step" or "next" (all these
commands are explained below). The optional *globals* and *locals*
arguments specify the environment in which the code is executed; by
default the dictionary of the module "__main__" is used. (See the
explanation of the built-in "exec()" or "eval()" functions.)
pdb.runeval(expression, globals=None, locals=None)
Evaluate the *expression* (given as a string or a code object)
under debugger control. When "runeval()" returns, it returns the
value of the expression. Otherwise this function is similar to
"run()".
pdb.runcall(function, *args, **kwds)
Call the *function* (a function or method object, not a string)
with the given arguments. When "runcall()" returns, it returns
whatever the function call returned. The debugger prompt appears
as soon as the function is entered.
pdb.set_trace(*, header=None)
Enter the debugger at the calling stack frame. This is useful to
hard-code a breakpoint at a given point in a program, even if the
code is not otherwise being debugged (e.g. when an assertion
fails). If given, *header* is printed to the console just before
debugging begins.
Changed in version 3.7: The keyword-only argument *header*.
pdb.post_mortem(traceback=None)
Enter post-mortem debugging of the given *traceback* object. If no
*traceback* is given, it uses the one of the exception that is
currently being handled (an exception must be being handled if the
default is to be used).
pdb.pm()
Enter post-mortem debugging of the traceback found in
"sys.last_traceback".
The "run*" functions and "set_trace()" are aliases for instantiating
the "Pdb" class and calling the method of the same name. If you want
to access further features, you have to do this yourself:
class pdb.Pdb(completekey='tab', stdin=None, stdout=None, skip=None, nosigint=False, readrc=True)
"Pdb" is the debugger class.
The *completekey*, *stdin* and *stdout* arguments are passed to the
underlying "cmd.Cmd" class; see the description there.
The *skip* argument, if given, must be an iterable of glob-style
module name patterns. The debugger will not step into frames that
originate in a module that matches one of these patterns. [1]
By default, Pdb sets a handler for the SIGINT signal (which is sent
when the user presses "Ctrl-C" on the console) when you give a
"continue" command. This allows you to break into the debugger
again by pressing "Ctrl-C". If you want Pdb not to touch the
SIGINT handler, set *nosigint* to true.
The *readrc* argument defaults to true and controls whether Pdb
will load .pdbrc files from the filesystem.
Example call to enable tracing with *skip*:
import pdb; pdb.Pdb(skip=['django.*']).set_trace()
Raises an auditing event "pdb.Pdb" with no arguments.
New in version 3.1: The *skip* argument.
New in version 3.2: The *nosigint* argument. Previously, a SIGINT
handler was never set by Pdb.
Changed in version 3.6: The *readrc* argument.
run(statement, globals=None, locals=None)
runeval(expression, globals=None, locals=None)
runcall(function, *args, **kwds)
set_trace()
See the documentation for the functions explained above.
Debugger Commands
=================
The commands recognized by the debugger are listed below. Most
commands can be abbreviated to one or two letters as indicated; e.g.
"h(elp)" means that either "h" or "help" can be used to enter the help
command (but not "he" or "hel", nor "H" or "Help" or "HELP").
Arguments to commands must be separated by whitespace (spaces or
tabs). Optional arguments are enclosed in square brackets ("[]") in
the command syntax; the square brackets must not be typed.
Alternatives in the command syntax are separated by a vertical bar
("|").
Entering a blank line repeats the last command entered. Exception: if
the last command was a "list" command, the next 11 lines are listed.
Commands that the debugger doesn’t recognize are assumed to be Python
statements and are executed in the context of the program being
debugged. Python statements can also be prefixed with an exclamation
point ("!"). This is a powerful way to inspect the program being
debugged; it is even possible to change a variable or call a function.
When an exception occurs in such a statement, the exception name is
printed but the debugger’s state is not changed.
The debugger supports aliases. Aliases can have parameters which
allows one a certain level of adaptability to the context under
examination.
Multiple commands may be entered on a single line, separated by ";;".
(A single ";" is not used as it is the separator for multiple commands
in a line that is passed to the Python parser.) No intelligence is
applied to separating the commands; the input is split at the first
";;" pair, even if it is in the middle of a quoted string.
If a file ".pdbrc" exists in the user’s home directory or in the
current directory, it is read in and executed as if it had been typed
at the debugger prompt. This is particularly useful for aliases. If
both files exist, the one in the home directory is read first and
aliases defined there can be overridden by the local file.
Changed in version 3.2: ".pdbrc" can now contain commands that
continue debugging, such as "continue" or "next". Previously, these
commands had no effect.
h(elp) [command]
Without argument, print the list of available commands. With a
*command* as argument, print help about that command. "help pdb"
displays the full documentation (the docstring of the "pdb"
module). Since the *command* argument must be an identifier, "help
exec" must be entered to get help on the "!" command.
w(here)
Print a stack trace, with the most recent frame at the bottom. An
arrow indicates the current frame, which determines the context of
most commands.
d(own) [count]
Move the current frame *count* (default one) levels down in the
stack trace (to a newer frame).
u(p) [count]
Move the current frame *count* (default one) levels up in the stack
trace (to an older frame).
b(reak) [([filename:]lineno | function) [, condition]]
With a *lineno* argument, set a break there in the current file.
With a *function* argument, set a break at the first executable
statement within that function. The line number may be prefixed
with a filename and a colon, to specify a breakpoint in another
file (probably one that hasn’t been loaded yet). The file is
searched on "sys.path". Note that each breakpoint is assigned a
number to which all the other breakpoint commands refer.
If a second argument is present, it is an expression which must
evaluate to true before the breakpoint is honored.
Without argument, list all breaks, including for each breakpoint,
the number of times that breakpoint has been hit, the current
ignore count, and the associated condition if any.
tbreak [([filename:]lineno | function) [, condition]]
Temporary breakpoint, which is removed automatically when it is
first hit. The arguments are the same as for "break".
cl(ear) [filename:lineno | bpnumber [bpnumber ...]]
With a *filename:lineno* argument, clear all the breakpoints at
this line. With a space separated list of breakpoint numbers, clear
those breakpoints. Without argument, clear all breaks (but first
ask confirmation).
disable [bpnumber [bpnumber ...]]
Disable the breakpoints given as a space separated list of
breakpoint numbers. Disabling a breakpoint means it cannot cause
the program to stop execution, but unlike clearing a breakpoint, it
remains in the list of breakpoints and can be (re-)enabled.
enable [bpnumber [bpnumber ...]]
Enable the breakpoints specified.
ignore bpnumber [count]
Set the ignore count for the given breakpoint number. If count is
omitted, the ignore count is set to 0. A breakpoint becomes active
when the ignore count is zero. When non-zero, the count is
decremented each time the breakpoint is reached and the breakpoint
is not disabled and any associated condition evaluates to true.
condition bpnumber [condition]
Set a new *condition* for the breakpoint, an expression which must
evaluate to true before the breakpoint is honored. If *condition*
is absent, any existing condition is removed; i.e., the breakpoint
is made unconditional.
commands [bpnumber]
Specify a list of commands for breakpoint number *bpnumber*. The
commands themselves appear on the following lines. Type a line
containing just "end" to terminate the commands. An example:
(Pdb) commands 1
(com) p some_variable
(com) end
(Pdb)
To remove all commands from a breakpoint, type "commands" and
follow it immediately with "end"; that is, give no commands.
With no *bpnumber* argument, "commands" refers to the last
breakpoint set.
You can use breakpoint commands to start your program up again.
Simply use the "continue" command, or "step", or any other command
that resumes execution.
Specifying any command resuming execution (currently "continue",
"step", "next", "return", "jump", "quit" and their abbreviations)
terminates the command list (as if that command was immediately
followed by end). This is because any time you resume execution
(even with a simple next or step), you may encounter another
breakpoint—which could have its own command list, leading to
ambiguities about which list to execute.
If you use the ‘silent’ command in the command list, the usual
message about stopping at a breakpoint is not printed. This may be
desirable for breakpoints that are to print a specific message and
then continue. If none of the other commands print anything, you
see no sign that the breakpoint was reached.
s(tep)
Execute the current line, stop at the first possible occasion
(either in a function that is called or on the next line in the
current function).
n(ext)
Continue execution until the next line in the current function is
reached or it returns. (The difference between "next" and "step"
is that "step" stops inside a called function, while "next"
executes called functions at (nearly) full speed, only stopping at
the next line in the current function.)
unt(il) [lineno]
Without argument, continue execution until the line with a number
greater than the current one is reached.
With a line number, continue execution until a line with a number
greater or equal to that is reached. In both cases, also stop when
the current frame returns.
Changed in version 3.2: Allow giving an explicit line number.
r(eturn)
Continue execution until the current function returns.
c(ont(inue))
Continue execution, only stop when a breakpoint is encountered.
j(ump) lineno
Set the next line that will be executed. Only available in the
bottom-most frame. This lets you jump back and execute code again,
or jump forward to skip code that you don’t want to run.
It should be noted that not all jumps are allowed – for instance it
is not possible to jump into the middle of a "for" loop or out of a
"finally" clause.
l(ist) [first[, last]]
List source code for the current file. Without arguments, list 11
lines around the current line or continue the previous listing.
With "." as argument, list 11 lines around the current line. With
one argument, list 11 lines around at that line. With two
arguments, list the given range; if the second argument is less
than the first, it is interpreted as a count.
The current line in the current frame is indicated by "->". If an
exception is being debugged, the line where the exception was
originally raised or propagated is indicated by ">>", if it differs
from the current line.
New in version 3.2: The ">>" marker.
ll | longlist
List all source code for the current function or frame.
Interesting lines are marked as for "list".
New in version 3.2.
a(rgs)
Print the argument list of the current function.
p expression
Evaluate the *expression* in the current context and print its
value.
Note:
"print()" can also be used, but is not a debugger command — this
executes the Python "print()" function.
pp expression
Like the "p" command, except the value of the expression is pretty-
printed using the "pprint" module.
whatis expression
Print the type of the *expression*.
source expression
Try to get source code for the given object and display it.
New in version 3.2.
display [expression]
Display the value of the expression if it changed, each time
execution stops in the current frame.
Without expression, list all display expressions for the current
frame.
New in version 3.2.
undisplay [expression]
Do not display the expression any more in the current frame.
Without expression, clear all display expressions for the current
frame.
New in version 3.2.
interact
Start an interactive interpreter (using the "code" module) whose
global namespace contains all the (global and local) names found in
the current scope.
New in version 3.2.
alias [name [command]]
Create an alias called *name* that executes *command*. The command
must *not* be enclosed in quotes. Replaceable parameters can be
indicated by "%1", "%2", and so on, while "%*" is replaced by all
the parameters. If no command is given, the current alias for
*name* is shown. If no arguments are given, all aliases are listed.
Aliases may be nested and can contain anything that can be legally
typed at the pdb prompt. Note that internal pdb commands *can* be
overridden by aliases. Such a command is then hidden until the
alias is removed. Aliasing is recursively applied to the first
word of the command line; all other words in the line are left
alone.
As an example, here are two useful aliases (especially when placed
in the ".pdbrc" file):
# Print instance variables (usage "pi classInst")
alias pi for k in %1.__dict__.keys(): print("%1.",k,"=",%1.__dict__[k])
# Print instance variables in self
alias ps pi self
unalias name
Delete the specified alias.
! statement
Execute the (one-line) *statement* in the context of the current
stack frame. The exclamation point can be omitted unless the first
word of the statement resembles a debugger command. To set a
global variable, you can prefix the assignment command with a
"global" statement on the same line, e.g.:
(Pdb) global list_options; list_options = ['-l']
(Pdb)
run [args ...]
restart [args ...]
Restart the debugged Python program. If an argument is supplied,
it is split with "shlex" and the result is used as the new
"sys.argv". History, breakpoints, actions and debugger options are
preserved. "restart" is an alias for "run".
q(uit)
Quit from the debugger. The program being executed is aborted.
debug code
Enter a recursive debugger that steps through the code argument
(which is an arbitrary expression or statement to be executed in
the current environment).
retval
Print the return value for the last return of a function.
-[ Footnotes ]-
[1] Whether a frame is considered to originate in a certain module is
determined by the "__name__" in the frame globals.
a� The "del" statement
*******************
del_stmt ::= "del" target_list
Deletion is recursively defined very similar to the way assignment is
defined. Rather than spelling it out in full details, here are some
hints.
Deletion of a target list recursively deletes each target, from left
to right.
Deletion of a name removes the binding of that name from the local or
global namespace, depending on whether the name occurs in a "global"
statement in the same code block. If the name is unbound, a
"NameError" exception will be raised.
Deletion of attribute references, subscriptions and slicings is passed
to the primary object involved; deletion of a slicing is in general
equivalent to assignment of an empty slice of the right type (but even
this is determined by the sliced object).
Changed in version 3.2: Previously it was illegal to delete a name
from the local namespace if it occurs as a free variable in a nested
block.
u Dictionary displays
*******************
A dictionary display is a possibly empty series of key/datum pairs
enclosed in curly braces:
dict_display ::= "{" [key_datum_list | dict_comprehension] "}"
key_datum_list ::= key_datum ("," key_datum)* [","]
key_datum ::= expression ":" expression | "**" or_expr
dict_comprehension ::= expression ":" expression comp_for
A dictionary display yields a new dictionary object.
If a comma-separated sequence of key/datum pairs is given, they are
evaluated from left to right to define the entries of the dictionary:
each key object is used as a key into the dictionary to store the
corresponding datum. This means that you can specify the same key
multiple times in the key/datum list, and the final dictionary’s value
for that key will be the last one given.
A double asterisk "**" denotes *dictionary unpacking*. Its operand
must be a *mapping*. Each mapping item is added to the new
dictionary. Later values replace values already set by earlier
key/datum pairs and earlier dictionary unpackings.
New in version 3.5: Unpacking into dictionary displays, originally
proposed by **PEP 448**.
A dict comprehension, in contrast to list and set comprehensions,
needs two expressions separated with a colon followed by the usual
“for” and “if” clauses. When the comprehension is run, the resulting
key and value elements are inserted in the new dictionary in the order
they are produced.
Restrictions on the types of the key values are listed earlier in
section The standard type hierarchy. (To summarize, the key type
should be *hashable*, which excludes all mutable objects.) Clashes
between duplicate keys are not detected; the last datum (textually
rightmost in the display) stored for a given key value prevails.
Changed in version 3.8: Prior to Python 3.8, in dict comprehensions,
the evaluation order of key and value was not well-defined. In
CPython, the value was evaluated before the key. Starting with 3.8,
the key is evaluated before the value, as proposed by **PEP 572**.
a� Interaction with dynamic features
*********************************
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
aX The "if" statement
******************
The "if" statement is used for conditional execution:
if_stmt ::= "if" assignment_expression ":" suite
("elif" assignment_expression ":" suite)*
["else" ":" suite]
It selects exactly one of the suites by evaluating the expressions one
by one until one is found to be true (see section Boolean operations
for the definition of true and false); then that suite is executed
(and no other part of the "if" statement is executed or evaluated).
If all expressions are false, the suite of the "else" clause, if
present, is executed.
u� Exceptions
**********
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is *raised* at the point where the error is
detected; it may be *handled* by the surrounding code block or by any
code block that directly or indirectly invoked the code block where
the error occurred.
The Python interpreter raises an exception when it detects a run-time
error (such as division by zero). A Python program can also
explicitly raise an exception with the "raise" statement. Exception
handlers are specified with the "try" … "except" statement. The
"finally" clause of such a statement can be used to specify cleanup
code which does not handle the exception, but is executed whether an
exception occurred or not in the preceding code.
Python uses the “termination” model of error handling: an exception
handler can find out what happened and continue execution at an outer
level, but it cannot repair the cause of the error and retry the
failing operation (except by re-entering the offending piece of code
from the top).
When an exception is not handled at all, the interpreter terminates
execution of the program, or returns to its interactive main loop. In
either case, it prints a stack traceback, except when the exception is
"SystemExit".
Exceptions are identified by class instances. The "except" clause is
selected depending on the class of the instance: it must reference the
class of the instance or a base class thereof. The instance can be
received by the handler and can carry additional information about the
exceptional condition.
Note:
Exception messages are not part of the Python API. Their contents
may change from one version of Python to the next without warning
and should not be relied on by code which will run under multiple
versions of the interpreter.
See also the description of the "try" statement in section The try
statement and "raise" statement in section The raise statement.
-[ Footnotes ]-
[1] This limitation occurs because the code that is executed by these
operations is not available at the time the module is compiled.
u$ Execution model
***************
Structure of a program
======================
A Python program is constructed from code blocks. A *block* is a piece
of Python program text that is executed as a unit. The following are
blocks: a module, a function body, and a class definition. Each
command typed interactively is a block. A script file (a file given
as standard input to the interpreter or specified as a command line
argument to the interpreter) is a code block. A script command (a
command specified on the interpreter command line with the "-c"
option) is a code block. The string argument passed to the built-in
functions "eval()" and "exec()" is a code block.
A code block is executed in an *execution frame*. A frame contains
some administrative information (used for debugging) and determines
where and how execution continues after the code block’s execution has
completed.
Naming and binding
==================
Binding of names
----------------
*Names* refer to objects. Names are introduced by name binding
operations.
The following constructs bind names: formal parameters to functions,
"import" statements, class and function definitions (these bind the
class or function name in the defining block), and targets that are
identifiers if occurring in an assignment, "for" loop header, or after
"as" in a "with" statement or "except" clause. The "import" statement
of the form "from ... import *" binds all names defined in the
imported module, except those beginning with an underscore. This form
may only be used at the module level.
A target occurring in a "del" statement is also considered bound for
this purpose (though the actual semantics are to unbind the name).
Each assignment or import statement occurs within a block defined by a
class or function definition or at the module level (the top-level
code block).
If a name is bound in a block, it is a local variable of that block,
unless declared as "nonlocal" or "global". If a name is bound at the
module level, it is a global variable. (The variables of the module
code block are local and global.) If a variable is used in a code
block but not defined there, it is a *free variable*.
Each occurrence of a name in the program text refers to the *binding*
of that name established by the following name resolution rules.
Resolution of names
-------------------
A *scope* defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. If the
definition occurs in a function block, the scope extends to any blocks
contained within the defining one, unless a contained block introduces
a different binding for the name.
When a name is used in a code block, it is resolved using the nearest
enclosing scope. The set of all such scopes visible to a code block
is called the block’s *environment*.
When a name is not found at all, a "NameError" exception is raised. If
the current scope is a function scope, and the name refers to a local
variable that has not yet been bound to a value at the point where the
name is used, an "UnboundLocalError" exception is raised.
"UnboundLocalError" is a subclass of "NameError".
If a name binding operation occurs anywhere within a code block, all
uses of the name within the block are treated as references to the
current block. This can lead to errors when a name is used within a
block before it is bound. This rule is subtle. Python lacks
declarations and allows name binding operations to occur anywhere
within a code block. The local variables of a code block can be
determined by scanning the entire text of the block for name binding
operations.
If the "global" statement occurs within a block, all uses of the name
specified in the statement refer to the binding of that name in the
top-level namespace. Names are resolved in the top-level namespace by
searching the global namespace, i.e. the namespace of the module
containing the code block, and the builtins namespace, the namespace
of the module "builtins". The global namespace is searched first. If
the name is not found there, the builtins namespace is searched. The
"global" statement must precede all uses of the name.
The "global" statement has the same scope as a name binding operation
in the same block. If the nearest enclosing scope for a free variable
contains a global statement, the free variable is treated as a global.
The "nonlocal" statement causes corresponding names to refer to
previously bound variables in the nearest enclosing function scope.
"SyntaxError" is raised at compile time if the given name does not
exist in any enclosing function scope.
The namespace for a module is automatically created the first time a
module is imported. The main module for a script is always called
"__main__".
Class definition blocks and arguments to "exec()" and "eval()" are
special in the context of name resolution. A class definition is an
executable statement that may use and define names. These references
follow the normal rules for name resolution with an exception that
unbound local variables are looked up in the global namespace. The
namespace of the class definition becomes the attribute dictionary of
the class. The scope of names defined in a class block is limited to
the class block; it does not extend to the code blocks of methods –
this includes comprehensions and generator expressions since they are
implemented using a function scope. This means that the following
will fail:
class A:
a = 42
b = list(a + i for i in range(10))
Builtins and restricted execution
---------------------------------
**CPython implementation detail:** Users should not touch
"__builtins__"; it is strictly an implementation detail. Users
wanting to override values in the builtins namespace should "import"
the "builtins" module and modify its attributes appropriately.
The builtins namespace associated with the execution of a code block
is actually found by looking up the name "__builtins__" in its global
namespace; this should be a dictionary or a module (in the latter case
the module’s dictionary is used). By default, when in the "__main__"
module, "__builtins__" is the built-in module "builtins"; when in any
other module, "__builtins__" is an alias for the dictionary of the
"builtins" module itself.
Interaction with dynamic features
---------------------------------
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
Exceptions
==========
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is *raised* at the point where the error is
detected; it may be *handled* by the surrounding code block or by any
code block that directly or indirectly invoked the code block where
the error occurred.
The Python interpreter raises an exception when it detects a run-time
error (such as division by zero). A Python program can also
explicitly raise an exception with the "raise" statement. Exception
handlers are specified with the "try" … "except" statement. The
"finally" clause of such a statement can be used to specify cleanup
code which does not handle the exception, but is executed whether an
exception occurred or not in the preceding code.
Python uses the “termination” model of error handling: an exception
handler can find out what happened and continue execution at an outer
level, but it cannot repair the cause of the error and retry the
failing operation (except by re-entering the offending piece of code
from the top).
When an exception is not handled at all, the interpreter terminates
execution of the program, or returns to its interactive main loop. In
either case, it prints a stack traceback, except when the exception is
"SystemExit".
Exceptions are identified by class instances. The "except" clause is
selected depending on the class of the instance: it must reference the
class of the instance or a base class thereof. The instance can be
received by the handler and can carry additional information about the
exceptional condition.
Note:
Exception messages are not part of the Python API. Their contents
may change from one version of Python to the next without warning
and should not be relied on by code which will run under multiple
versions of the interpreter.
See also the description of the "try" statement in section The try
statement and "raise" statement in section The raise statement.
-[ Footnotes ]-
[1] This limitation occurs because the code that is executed by these
operations is not available at the time the module is compiled.
uz Expression lists
****************
expression_list ::= expression ("," expression)* [","]
starred_list ::= starred_item ("," starred_item)* [","]
starred_expression ::= expression | (starred_item ",")* [starred_item]
starred_item ::= assignment_expression | "*" or_expr
Except when part of a list or set display, an expression list
containing at least one comma yields a tuple. The length of the tuple
is the number of expressions in the list. The expressions are
evaluated from left to right.
An asterisk "*" denotes *iterable unpacking*. Its operand must be an
*iterable*. The iterable is expanded into a sequence of items, which
are included in the new tuple, list, or set, at the site of the
unpacking.
New in version 3.5: Iterable unpacking in expression lists, originally
proposed by **PEP 448**.
The trailing comma is required only to create a single tuple (a.k.a. a
*singleton*); it is optional in all other cases. A single expression
without a trailing comma doesn’t create a tuple, but rather yields the
value of that expression. (To create an empty tuple, use an empty pair
of parentheses: "()".)
a� Floating point literals
***********************
Floating point literals are described by the following lexical
definitions:
floatnumber ::= pointfloat | exponentfloat
pointfloat ::= [digitpart] fraction | digitpart "."
exponentfloat ::= (digitpart | pointfloat) exponent
digitpart ::= digit (["_"] digit)*
fraction ::= "." digitpart
exponent ::= ("e" | "E") ["+" | "-"] digitpart
Note that the integer and exponent parts are always interpreted using
radix 10. For example, "077e010" is legal, and denotes the same number
as "77e10". The allowed range of floating point literals is
implementation-dependent. As in integer literals, underscores are
supported for digit grouping.
Some examples of floating point literals:
3.14 10. .001 1e100 3.14e-10 0e0 3.14_15_93
Changed in version 3.6: Underscores are now allowed for grouping
purposes in literals.
u�
The "for" statement
*******************
The "for" statement is used to iterate over the elements of a sequence
(such as a string, tuple or list) or other iterable object:
for_stmt ::= "for" target_list "in" expression_list ":" suite
["else" ":" suite]
The expression list is evaluated once; it should yield an iterable
object. An iterator is created for the result of the
"expression_list". The suite is then executed once for each item
provided by the iterator, in the order returned by the iterator. Each
item in turn is assigned to the target list using the standard rules
for assignments (see Assignment statements), and then the suite is
executed. When the items are exhausted (which is immediately when the
sequence is empty or an iterator raises a "StopIteration" exception),
the suite in the "else" clause, if present, is executed, and the loop
terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and continues
with the next item, or with the "else" clause if there is no next
item.
The for-loop makes assignments to the variables in the target list.
This overwrites all previous assignments to those variables including
those made in the suite of the for-loop:
for i in range(10):
print(i)
i = 5 # this will not affect the for-loop
# because i will be overwritten with the next
# index in the range
Names in the target list are not deleted when the loop is finished,
but if the sequence is empty, they will not have been assigned to at
all by the loop. Hint: the built-in function "range()" returns an
iterator of integers suitable to emulate the effect of Pascal’s "for i
:= a to b do"; e.g., "list(range(3))" returns the list "[0, 1, 2]".
Note:
There is a subtlety when the sequence is being modified by the loop
(this can only occur for mutable sequences, e.g. lists). An
internal counter is used to keep track of which item is used next,
and this is incremented on each iteration. When this counter has
reached the length of the sequence the loop terminates. This means
that if the suite deletes the current (or a previous) item from the
sequence, the next item will be skipped (since it gets the index of
the current item which has already been treated). Likewise, if the
suite inserts an item in the sequence before the current item, the
current item will be treated again the next time through the loop.
This can lead to nasty bugs that can be avoided by making a
temporary copy using a slice of the whole sequence, e.g.,
for x in a[:]:
if x < 0: a.remove(x)
u�` Format String Syntax
********************
The "str.format()" method and the "Formatter" class share the same
syntax for format strings (although in the case of "Formatter",
subclasses can define their own format string syntax). The syntax is
related to that of formatted string literals, but it is less
sophisticated and, in particular, does not support arbitrary
expressions.
Format strings contain “replacement fields” surrounded by curly braces
"{}". Anything that is not contained in braces is considered literal
text, which is copied unchanged to the output. If you need to include
a brace character in the literal text, it can be escaped by doubling:
"{{" and "}}".
The grammar for a replacement field is as follows:
replacement_field ::= "{" [field_name] ["!" conversion] [":" format_spec] "}"
field_name ::= arg_name ("." attribute_name | "[" element_index "]")*
arg_name ::= [identifier | digit+]
attribute_name ::= identifier
element_index ::= digit+ | index_string
index_string ::= <any source character except "]"> +
conversion ::= "r" | "s" | "a"
format_spec ::= <described in the next section>
In less formal terms, the replacement field can start with a
*field_name* that specifies the object whose value is to be formatted
and inserted into the output instead of the replacement field. The
*field_name* is optionally followed by a *conversion* field, which is
preceded by an exclamation point "'!'", and a *format_spec*, which is
preceded by a colon "':'". These specify a non-default format for the
replacement value.
See also the Format Specification Mini-Language section.
The *field_name* itself begins with an *arg_name* that is either a
number or a keyword. If it’s a number, it refers to a positional
argument, and if it’s a keyword, it refers to a named keyword
argument. If the numerical arg_names in a format string are 0, 1, 2,
… in sequence, they can all be omitted (not just some) and the numbers
0, 1, 2, … will be automatically inserted in that order. Because
*arg_name* is not quote-delimited, it is not possible to specify
arbitrary dictionary keys (e.g., the strings "'10'" or "':-]'") within
a format string. The *arg_name* can be followed by any number of index
or attribute expressions. An expression of the form "'.name'" selects
the named attribute using "getattr()", while an expression of the form
"'[index]'" does an index lookup using "__getitem__()".
Changed in version 3.1: The positional argument specifiers can be
omitted for "str.format()", so "'{} {}'.format(a, b)" is equivalent to
"'{0} {1}'.format(a, b)".
Changed in version 3.4: The positional argument specifiers can be
omitted for "Formatter".
Some simple format string examples:
"First, thou shalt count to {0}" # References first positional argument
"Bring me a {}" # Implicitly references the first positional argument
"From {} to {}" # Same as "From {0} to {1}"
"My quest is {name}" # References keyword argument 'name'
"Weight in tons {0.weight}" # 'weight' attribute of first positional arg
"Units destroyed: {players[0]}" # First element of keyword argument 'players'.
The *conversion* field causes a type coercion before formatting.
Normally, the job of formatting a value is done by the "__format__()"
method of the value itself. However, in some cases it is desirable to
force a type to be formatted as a string, overriding its own
definition of formatting. By converting the value to a string before
calling "__format__()", the normal formatting logic is bypassed.
Three conversion flags are currently supported: "'!s'" which calls
"str()" on the value, "'!r'" which calls "repr()" and "'!a'" which
calls "ascii()".
Some examples:
"Harold's a clever {0!s}" # Calls str() on the argument first
"Bring out the holy {name!r}" # Calls repr() on the argument first
"More {!a}" # Calls ascii() on the argument first
The *format_spec* field contains a specification of how the value
should be presented, including such details as field width, alignment,
padding, decimal precision and so on. Each value type can define its
own “formatting mini-language” or interpretation of the *format_spec*.
Most built-in types support a common formatting mini-language, which
is described in the next section.
A *format_spec* field can also include nested replacement fields
within it. These nested replacement fields may contain a field name,
conversion flag and format specification, but deeper nesting is not
allowed. The replacement fields within the format_spec are
substituted before the *format_spec* string is interpreted. This
allows the formatting of a value to be dynamically specified.
See the Format examples section for some examples.
Format Specification Mini-Language
==================================
“Format specifications” are used within replacement fields contained
within a format string to define how individual values are presented
(see Format String Syntax and Formatted string literals). They can
also be passed directly to the built-in "format()" function. Each
formattable type may define how the format specification is to be
interpreted.
Most built-in types implement the following options for format
specifications, although some of the formatting options are only
supported by the numeric types.
A general convention is that an empty format specification produces
the same result as if you had called "str()" on the value. A non-empty
format specification typically modifies the result.
The general form of a *standard format specifier* is:
format_spec ::= [[fill]align][sign][#][0][width][grouping_option][.precision][type]
fill ::= <any character>
align ::= "<" | ">" | "=" | "^"
sign ::= "+" | "-" | " "
width ::= digit+
grouping_option ::= "_" | ","
precision ::= digit+
type ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%"
If a valid *align* value is specified, it can be preceded by a *fill*
character that can be any character and defaults to a space if
omitted. It is not possible to use a literal curly brace (”"{"” or
“"}"”) as the *fill* character in a formatted string literal or when
using the "str.format()" method. However, it is possible to insert a
curly brace with a nested replacement field. This limitation doesn’t
affect the "format()" function.
The meaning of the various alignment options is as follows:
+-----------+------------------------------------------------------------+
| Option | Meaning |
|===========|============================================================|
| "'<'" | Forces the field to be left-aligned within the available |
| | space (this is the default for most objects). |
+-----------+------------------------------------------------------------+
| "'>'" | Forces the field to be right-aligned within the available |
| | space (this is the default for numbers). |
+-----------+------------------------------------------------------------+
| "'='" | Forces the padding to be placed after the sign (if any) |
| | but before the digits. This is used for printing fields |
| | in the form ‘+000000120’. This alignment option is only |
| | valid for numeric types. It becomes the default when ‘0’ |
| | immediately precedes the field width. |
+-----------+------------------------------------------------------------+
| "'^'" | Forces the field to be centered within the available |
| | space. |
+-----------+------------------------------------------------------------+
Note that unless a minimum field width is defined, the field width
will always be the same size as the data to fill it, so that the
alignment option has no meaning in this case.
The *sign* option is only valid for number types, and can be one of
the following:
+-----------+------------------------------------------------------------+
| Option | Meaning |
|===========|============================================================|
| "'+'" | indicates that a sign should be used for both positive as |
| | well as negative numbers. |
+-----------+------------------------------------------------------------+
| "'-'" | indicates that a sign should be used only for negative |
| | numbers (this is the default behavior). |
+-----------+------------------------------------------------------------+
| space | indicates that a leading space should be used on positive |
| | numbers, and a minus sign on negative numbers. |
+-----------+------------------------------------------------------------+
The "'#'" option causes the “alternate form” to be used for the
conversion. The alternate form is defined differently for different
types. This option is only valid for integer, float and complex
types. For integers, when binary, octal, or hexadecimal output is
used, this option adds the prefix respective "'0b'", "'0o'", or "'0x'"
to the output value. For float and complex the alternate form causes
the result of the conversion to always contain a decimal-point
character, even if no digits follow it. Normally, a decimal-point
character appears in the result of these conversions only if a digit
follows it. In addition, for "'g'" and "'G'" conversions, trailing
zeros are not removed from the result.
The "','" option signals the use of a comma for a thousands separator.
For a locale aware separator, use the "'n'" integer presentation type
instead.
Changed in version 3.1: Added the "','" option (see also **PEP 378**).
The "'_'" option signals the use of an underscore for a thousands
separator for floating point presentation types and for integer
presentation type "'d'". For integer presentation types "'b'", "'o'",
"'x'", and "'X'", underscores will be inserted every 4 digits. For
other presentation types, specifying this option is an error.
Changed in version 3.6: Added the "'_'" option (see also **PEP 515**).
*width* is a decimal integer defining the minimum total field width,
including any prefixes, separators, and other formatting characters.
If not specified, then the field width will be determined by the
content.
When no explicit alignment is given, preceding the *width* field by a
zero ("'0'") character enables sign-aware zero-padding for numeric
types. This is equivalent to a *fill* character of "'0'" with an
*alignment* type of "'='".
The *precision* is a decimal number indicating how many digits should
be displayed after the decimal point for a floating point value
formatted with "'f'" and "'F'", or before and after the decimal point
for a floating point value formatted with "'g'" or "'G'". For non-
number types the field indicates the maximum field size - in other
words, how many characters will be used from the field content. The
*precision* is not allowed for integer values.
Finally, the *type* determines how the data should be presented.
The available string presentation types are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'s'" | String format. This is the default type for strings and |
| | may be omitted. |
+-----------+------------------------------------------------------------+
| None | The same as "'s'". |
+-----------+------------------------------------------------------------+
The available integer presentation types are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'b'" | Binary format. Outputs the number in base 2. |
+-----------+------------------------------------------------------------+
| "'c'" | Character. Converts the integer to the corresponding |
| | unicode character before printing. |
+-----------+------------------------------------------------------------+
| "'d'" | Decimal Integer. Outputs the number in base 10. |
+-----------+------------------------------------------------------------+
| "'o'" | Octal format. Outputs the number in base 8. |
+-----------+------------------------------------------------------------+
| "'x'" | Hex format. Outputs the number in base 16, using lower- |
| | case letters for the digits above 9. |
+-----------+------------------------------------------------------------+
| "'X'" | Hex format. Outputs the number in base 16, using upper- |
| | case letters for the digits above 9. |
+-----------+------------------------------------------------------------+
| "'n'" | Number. This is the same as "'d'", except that it uses the |
| | current locale setting to insert the appropriate number |
| | separator characters. |
+-----------+------------------------------------------------------------+
| None | The same as "'d'". |
+-----------+------------------------------------------------------------+
In addition to the above presentation types, integers can be formatted
with the floating point presentation types listed below (except "'n'"
and "None"). When doing so, "float()" is used to convert the integer
to a floating point number before formatting.
The available presentation types for "float" and "Decimal" values are:
+-----------+------------------------------------------------------------+
| Type | Meaning |
|===========|============================================================|
| "'e'" | Scientific notation. For a given precision "p", formats |
| | the number in scientific notation with the letter ‘e’ |
| | separating the coefficient from the exponent. The |
| | coefficient has one digit before and "p" digits after the |
| | decimal point, for a total of "p + 1" significant digits. |
| | With no precision given, uses a precision of "6" digits |
| | after the decimal point for "float", and shows all |
| | coefficient digits for "Decimal". If no digits follow the |
| | decimal point, the decimal point is also removed unless |
| | the "#" option is used. |
+-----------+------------------------------------------------------------+
| "'E'" | Scientific notation. Same as "'e'" except it uses an upper |
| | case ‘E’ as the separator character. |
+-----------+------------------------------------------------------------+
| "'f'" | Fixed-point notation. For a given precision "p", formats |
| | the number as a decimal number with exactly "p" digits |
| | following the decimal point. With no precision given, uses |
| | a precision of "6" digits after the decimal point for |
| | "float", and uses a precision large enough to show all |
| | coefficient digits for "Decimal". If no digits follow the |
| | decimal point, the decimal point is also removed unless |
| | the "#" option is used. |
+-----------+------------------------------------------------------------+
| "'F'" | Fixed-point notation. Same as "'f'", but converts "nan" to |
| | "NAN" and "inf" to "INF". |
+-----------+------------------------------------------------------------+
| "'g'" | General format. For a given precision "p >= 1", this |
| | rounds the number to "p" significant digits and then |
| | formats the result in either fixed-point format or in |
| | scientific notation, depending on its magnitude. A |
| | precision of "0" is treated as equivalent to a precision |
| | of "1". The precise rules are as follows: suppose that |
| | the result formatted with presentation type "'e'" and |
| | precision "p-1" would have exponent "exp". Then, if "m <= |
| | exp < p", where "m" is -4 for floats and -6 for |
| | "Decimals", the number is formatted with presentation type |
| | "'f'" and precision "p-1-exp". Otherwise, the number is |
| | formatted with presentation type "'e'" and precision |
| | "p-1". In both cases insignificant trailing zeros are |
| | removed from the significand, and the decimal point is |
| | also removed if there are no remaining digits following |
| | it, unless the "'#'" option is used. With no precision |
| | given, uses a precision of "6" significant digits for |
| | "float". For "Decimal", the coefficient of the result is |
| | formed from the coefficient digits of the value; |
| | scientific notation is used for values smaller than "1e-6" |
| | in absolute value and values where the place value of the |
| | least significant digit is larger than 1, and fixed-point |
| | notation is used otherwise. Positive and negative |
| | infinity, positive and negative zero, and nans, are |
| | formatted as "inf", "-inf", "0", "-0" and "nan" |
| | respectively, regardless of the precision. |
+-----------+------------------------------------------------------------+
| "'G'" | General format. Same as "'g'" except switches to "'E'" if |
| | the number gets too large. The representations of infinity |
| | and NaN are uppercased, too. |
+-----------+------------------------------------------------------------+
| "'n'" | Number. This is the same as "'g'", except that it uses the |
| | current locale setting to insert the appropriate number |
| | separator characters. |
+-----------+------------------------------------------------------------+
| "'%'" | Percentage. Multiplies the number by 100 and displays in |
| | fixed ("'f'") format, followed by a percent sign. |
+-----------+------------------------------------------------------------+
| None | For "float" this is the same as "'g'", except that when |
| | fixed-point notation is used to format the result, it |
| | always includes at least one digit past the decimal point. |
| | The precision used is as large as needed to represent the |
| | given value faithfully. For "Decimal", this is the same |
| | as either "'g'" or "'G'" depending on the value of |
| | "context.capitals" for the current decimal context. The |
| | overall effect is to match the output of "str()" as |
| | altered by the other format modifiers. |
+-----------+------------------------------------------------------------+
Format examples
===============
This section contains examples of the "str.format()" syntax and
comparison with the old "%"-formatting.
In most of the cases the syntax is similar to the old "%"-formatting,
with the addition of the "{}" and with ":" used instead of "%". For
example, "'%03.2f'" can be translated to "'{:03.2f}'".
The new format syntax also supports new and different options, shown
in the following examples.
Accessing arguments by position:
>>> '{0}, {1}, {2}'.format('a', 'b', 'c')
'a, b, c'
>>> '{}, {}, {}'.format('a', 'b', 'c') # 3.1+ only
'a, b, c'
>>> '{2}, {1}, {0}'.format('a', 'b', 'c')
'c, b, a'
>>> '{2}, {1}, {0}'.format(*'abc') # unpacking argument sequence
'c, b, a'
>>> '{0}{1}{0}'.format('abra', 'cad') # arguments' indices can be repeated
'abracadabra'
Accessing arguments by name:
>>> 'Coordinates: {latitude}, {longitude}'.format(latitude='37.24N', longitude='-115.81W')
'Coordinates: 37.24N, -115.81W'
>>> coord = {'latitude': '37.24N', 'longitude': '-115.81W'}
>>> 'Coordinates: {latitude}, {longitude}'.format(**coord)
'Coordinates: 37.24N, -115.81W'
Accessing arguments’ attributes:
>>> c = 3-5j
>>> ('The complex number {0} is formed from the real part {0.real} '
... 'and the imaginary part {0.imag}.').format(c)
'The complex number (3-5j) is formed from the real part 3.0 and the imaginary part -5.0.'
>>> class Point:
... def __init__(self, x, y):
... self.x, self.y = x, y
... def __str__(self):
... return 'Point({self.x}, {self.y})'.format(self=self)
...
>>> str(Point(4, 2))
'Point(4, 2)'
Accessing arguments’ items:
>>> coord = (3, 5)
>>> 'X: {0[0]}; Y: {0[1]}'.format(coord)
'X: 3; Y: 5'
Replacing "%s" and "%r":
>>> "repr() shows quotes: {!r}; str() doesn't: {!s}".format('test1', 'test2')
"repr() shows quotes: 'test1'; str() doesn't: test2"
Aligning the text and specifying a width:
>>> '{:<30}'.format('left aligned')
'left aligned '
>>> '{:>30}'.format('right aligned')
' right aligned'
>>> '{:^30}'.format('centered')
' centered '
>>> '{:*^30}'.format('centered') # use '*' as a fill char
'***********centered***********'
Replacing "%+f", "%-f", and "% f" and specifying a sign:
>>> '{:+f}; {:+f}'.format(3.14, -3.14) # show it always
'+3.140000; -3.140000'
>>> '{: f}; {: f}'.format(3.14, -3.14) # show a space for positive numbers
' 3.140000; -3.140000'
>>> '{:-f}; {:-f}'.format(3.14, -3.14) # show only the minus -- same as '{:f}; {:f}'
'3.140000; -3.140000'
Replacing "%x" and "%o" and converting the value to different bases:
>>> # format also supports binary numbers
>>> "int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}".format(42)
'int: 42; hex: 2a; oct: 52; bin: 101010'
>>> # with 0x, 0o, or 0b as prefix:
>>> "int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}".format(42)
'int: 42; hex: 0x2a; oct: 0o52; bin: 0b101010'
Using the comma as a thousands separator:
>>> '{:,}'.format(1234567890)
'1,234,567,890'
Expressing a percentage:
>>> points = 19
>>> total = 22
>>> 'Correct answers: {:.2%}'.format(points/total)
'Correct answers: 86.36%'
Using type-specific formatting:
>>> import datetime
>>> d = datetime.datetime(2010, 7, 4, 12, 15, 58)
>>> '{:%Y-%m-%d %H:%M:%S}'.format(d)
'2010-07-04 12:15:58'
Nesting arguments and more complex examples:
>>> for align, text in zip('<^>', ['left', 'center', 'right']):
... '{0:{fill}{align}16}'.format(text, fill=align, align=align)
...
'left<<<<<<<<<<<<'
'^^^^^center^^^^^'
'>>>>>>>>>>>right'
>>>
>>> octets = [192, 168, 0, 1]
>>> '{:02X}{:02X}{:02X}{:02X}'.format(*octets)
'C0A80001'
>>> int(_, 16)
3232235521
>>>
>>> width = 5
>>> for num in range(5,12):
... for base in 'dXob':
... print('{0:{width}{base}}'.format(num, base=base, width=width), end=' ')
... print()
...
5 5 5 101
6 6 6 110
7 7 7 111
8 8 10 1000
9 9 11 1001
10 A 12 1010
11 B 13 1011
u| Function definitions
********************
A function definition defines a user-defined function object (see
section The standard type hierarchy):
funcdef ::= [decorators] "def" funcname "(" [parameter_list] ")"
["->" expression] ":" suite
decorators ::= decorator+
decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name ::= identifier ("." identifier)*
parameter_list ::= defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]]
| parameter_list_no_posonly
parameter_list_no_posonly ::= defparameter ("," defparameter)* ["," [parameter_list_starargs]]
| parameter_list_starargs
parameter_list_starargs ::= "*" [parameter] ("," defparameter)* ["," ["**" parameter [","]]]
| "**" parameter [","]
parameter ::= identifier [":" expression]
defparameter ::= parameter ["=" expression]
funcname ::= identifier
A function definition is an executable statement. Its execution binds
the function name in the current local namespace to a function object
(a wrapper around the executable code for the function). This
function object contains a reference to the current global namespace
as the global namespace to be used when the function is called.
The function definition does not execute the function body; this gets
executed only when the function is called. [2]
A function definition may be wrapped by one or more *decorator*
expressions. Decorator expressions are evaluated when the function is
defined, in the scope that contains the function definition. The
result must be a callable, which is invoked with the function object
as the only argument. The returned value is bound to the function name
instead of the function object. Multiple decorators are applied in
nested fashion. For example, the following code
@f1(arg)
@f2
def func(): pass
is roughly equivalent to
def func(): pass
func = f1(arg)(f2(func))
except that the original function is not temporarily bound to the name
"func".
When one or more *parameters* have the form *parameter* "="
*expression*, the function is said to have “default parameter values.”
For a parameter with a default value, the corresponding *argument* may
be omitted from a call, in which case the parameter’s default value is
substituted. If a parameter has a default value, all following
parameters up until the “"*"” must also have a default value — this is
a syntactic restriction that is not expressed by the grammar.
**Default parameter values are evaluated from left to right when the
function definition is executed.** This means that the expression is
evaluated once, when the function is defined, and that the same “pre-
computed” value is used for each call. This is especially important
to understand when a default parameter is a mutable object, such as a
list or a dictionary: if the function modifies the object (e.g. by
appending an item to a list), the default value is in effect modified.
This is generally not what was intended. A way around this is to use
"None" as the default, and explicitly test for it in the body of the
function, e.g.:
def whats_on_the_telly(penguin=None):
if penguin is None:
penguin = []
penguin.append("property of the zoo")
return penguin
Function call semantics are described in more detail in section Calls.
A function call always assigns values to all parameters mentioned in
the parameter list, either from positional arguments, from keyword
arguments, or from default values. If the form “"*identifier"” is
present, it is initialized to a tuple receiving any excess positional
parameters, defaulting to the empty tuple. If the form
“"**identifier"” is present, it is initialized to a new ordered
mapping receiving any excess keyword arguments, defaulting to a new
empty mapping of the same type. Parameters after “"*"” or
“"*identifier"” are keyword-only parameters and may only be passed by
keyword arguments. Parameters before “"/"” are positional-only
parameters and may only be passed by positional arguments.
Changed in version 3.8: The "/" function parameter syntax may be used
to indicate positional-only parameters. See **PEP 570** for details.
Parameters may have an *annotation* of the form “": expression"”
following the parameter name. Any parameter may have an annotation,
even those of the form "*identifier" or "**identifier". Functions may
have “return” annotation of the form “"-> expression"” after the
parameter list. These annotations can be any valid Python expression.
The presence of annotations does not change the semantics of a
function. The annotation values are available as values of a
dictionary keyed by the parameters’ names in the "__annotations__"
attribute of the function object. If the "annotations" import from
"__future__" is used, annotations are preserved as strings at runtime
which enables postponed evaluation. Otherwise, they are evaluated
when the function definition is executed. In this case annotations
may be evaluated in a different order than they appear in the source
code.
It is also possible to create anonymous functions (functions not bound
to a name), for immediate use in expressions. This uses lambda
expressions, described in section Lambdas. Note that the lambda
expression is merely a shorthand for a simplified function definition;
a function defined in a “"def"” statement can be passed around or
assigned to another name just like a function defined by a lambda
expression. The “"def"” form is actually more powerful since it
allows the execution of multiple statements and annotations.
**Programmer’s note:** Functions are first-class objects. A “"def"”
statement executed inside a function definition defines a local
function that can be returned or passed around. Free variables used
in the nested function can access the local variables of the function
containing the def. See section Naming and binding for details.
See also:
**PEP 3107** - Function Annotations
The original specification for function annotations.
**PEP 484** - Type Hints
Definition of a standard meaning for annotations: type hints.
**PEP 526** - Syntax for Variable Annotations
Ability to type hint variable declarations, including class
variables and instance variables
**PEP 563** - Postponed Evaluation of Annotations
Support for forward references within annotations by preserving
annotations in a string form at runtime instead of eager
evaluation.
u� The "global" statement
**********************
global_stmt ::= "global" identifier ("," identifier)*
The "global" statement is a declaration which holds for the entire
current code block. It means that the listed identifiers are to be
interpreted as globals. It would be impossible to assign to a global
variable without "global", although free variables may refer to
globals without being declared global.
Names listed in a "global" statement must not be used in the same code
block textually preceding that "global" statement.
Names listed in a "global" statement must not be defined as formal
parameters or in a "for" loop control target, "class" definition,
function definition, "import" statement, or variable annotation.
**CPython implementation detail:** The current implementation does not
enforce some of these restrictions, but programs should not abuse this
freedom, as future implementations may enforce them or silently change
the meaning of the program.
**Programmer’s note:** "global" is a directive to the parser. It
applies only to code parsed at the same time as the "global"
statement. In particular, a "global" statement contained in a string
or code object supplied to the built-in "exec()" function does not
affect the code block *containing* the function call, and code
contained in such a string is unaffected by "global" statements in the
code containing the function call. The same applies to the "eval()"
and "compile()" functions.
u� Reserved classes of identifiers
*******************************
Certain classes of identifiers (besides keywords) have special
meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
"_*"
Not imported by "from module import *". The special identifier "_"
is used in the interactive interpreter to store the result of the
last evaluation; it is stored in the "builtins" module. When not
in interactive mode, "_" has no special meaning and is not defined.
See section The import statement.
Note:
The name "_" is often used in conjunction with
internationalization; refer to the documentation for the
"gettext" module for more information on this convention.
"__*__"
System-defined names, informally known as “dunder” names. These
names are defined by the interpreter and its implementation
(including the standard library). Current system names are
discussed in the Special method names section and elsewhere. More
will likely be defined in future versions of Python. *Any* use of
"__*__" names, in any context, that does not follow explicitly
documented use, is subject to breakage without warning.
"__*"
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled form
to help avoid name clashes between “private” attributes of base and
derived classes. See section Identifiers (Names).
um Identifiers and keywords
************************
Identifiers (also referred to as *names*) are described by the
following lexical definitions.
The syntax of identifiers in Python is based on the Unicode standard
annex UAX-31, with elaboration and changes as defined below; see also
**PEP 3131** for further details.
Within the ASCII range (U+0001..U+007F), the valid characters for
identifiers are the same as in Python 2.x: the uppercase and lowercase
letters "A" through "Z", the underscore "_" and, except for the first
character, the digits "0" through "9".
Python 3.0 introduces additional characters from outside the ASCII
range (see **PEP 3131**). For these characters, the classification
uses the version of the Unicode Character Database as included in the
"unicodedata" module.
Identifiers are unlimited in length. Case is significant.
identifier ::= xid_start xid_continue*
id_start ::= <all characters in general categories Lu, Ll, Lt, Lm, Lo, Nl, the underscore, and characters with the Other_ID_Start property>
id_continue ::= <all characters in id_start, plus characters in the categories Mn, Mc, Nd, Pc and others with the Other_ID_Continue property>
xid_start ::= <all characters in id_start whose NFKC normalization is in "id_start xid_continue*">
xid_continue ::= <all characters in id_continue whose NFKC normalization is in "id_continue*">
The Unicode category codes mentioned above stand for:
* *Lu* - uppercase letters
* *Ll* - lowercase letters
* *Lt* - titlecase letters
* *Lm* - modifier letters
* *Lo* - other letters
* *Nl* - letter numbers
* *Mn* - nonspacing marks
* *Mc* - spacing combining marks
* *Nd* - decimal numbers
* *Pc* - connector punctuations
* *Other_ID_Start* - explicit list of characters in PropList.txt to
support backwards compatibility
* *Other_ID_Continue* - likewise
All identifiers are converted into the normal form NFKC while parsing;
comparison of identifiers is based on NFKC.
A non-normative HTML file listing all valid identifier characters for
Unicode 4.1 can be found at
https://www.unicode.org/Public/13.0.0/ucd/DerivedCoreProperties.txt
Keywords
========
The following identifiers are used as reserved words, or *keywords* of
the language, and cannot be used as ordinary identifiers. They must
be spelled exactly as written here:
False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield
Reserved classes of identifiers
===============================
Certain classes of identifiers (besides keywords) have special
meanings. These classes are identified by the patterns of leading and
trailing underscore characters:
"_*"
Not imported by "from module import *". The special identifier "_"
is used in the interactive interpreter to store the result of the
last evaluation; it is stored in the "builtins" module. When not
in interactive mode, "_" has no special meaning and is not defined.
See section The import statement.
Note:
The name "_" is often used in conjunction with
internationalization; refer to the documentation for the
"gettext" module for more information on this convention.
"__*__"
System-defined names, informally known as “dunder” names. These
names are defined by the interpreter and its implementation
(including the standard library). Current system names are
discussed in the Special method names section and elsewhere. More
will likely be defined in future versions of Python. *Any* use of
"__*__" names, in any context, that does not follow explicitly
documented use, is subject to breakage without warning.
"__*"
Class-private names. Names in this category, when used within the
context of a class definition, are re-written to use a mangled form
to help avoid name clashes between “private” attributes of base and
derived classes. See section Identifiers (Names).
a5 Imaginary literals
******************
Imaginary literals are described by the following lexical definitions:
imagnumber ::= (floatnumber | digitpart) ("j" | "J")
An imaginary literal yields a complex number with a real part of 0.0.
Complex numbers are represented as a pair of floating point numbers
and have the same restrictions on their range. To create a complex
number with a nonzero real part, add a floating point number to it,
e.g., "(3+4j)". Some examples of imaginary literals:
3.14j 10.j 10j .001j 1e100j 3.14e-10j 3.14_15_93j
u8" The "import" statement
**********************
import_stmt ::= "import" module ["as" identifier] ("," module ["as" identifier])*
| "from" relative_module "import" identifier ["as" identifier]
("," identifier ["as" identifier])*
| "from" relative_module "import" "(" identifier ["as" identifier]
("," identifier ["as" identifier])* [","] ")"
| "from" module "import" "*"
module ::= (identifier ".")* identifier
relative_module ::= "."* module | "."+
The basic import statement (no "from" clause) is executed in two
steps:
1. find a module, loading and initializing it if necessary
2. define a name or names in the local namespace for the scope where
the "import" statement occurs.
When the statement contains multiple clauses (separated by commas) the
two steps are carried out separately for each clause, just as though
the clauses had been separated out into individual import statements.
The details of the first step, finding and loading modules are
described in greater detail in the section on the import system, which
also describes the various types of packages and modules that can be
imported, as well as all the hooks that can be used to customize the
import system. Note that failures in this step may indicate either
that the module could not be located, *or* that an error occurred
while initializing the module, which includes execution of the
module’s code.
If the requested module is retrieved successfully, it will be made
available in the local namespace in one of three ways:
* If the module name is followed by "as", then the name following "as"
is bound directly to the imported module.
* If no other name is specified, and the module being imported is a
top level module, the module’s name is bound in the local namespace
as a reference to the imported module
* If the module being imported is *not* a top level module, then the
name of the top level package that contains the module is bound in
the local namespace as a reference to the top level package. The
imported module must be accessed using its full qualified name
rather than directly
The "from" form uses a slightly more complex process:
1. find the module specified in the "from" clause, loading and
initializing it if necessary;
2. for each of the identifiers specified in the "import" clauses:
1. check if the imported module has an attribute by that name
2. if not, attempt to import a submodule with that name and then
check the imported module again for that attribute
3. if the attribute is not found, "ImportError" is raised.
4. otherwise, a reference to that value is stored in the local
namespace, using the name in the "as" clause if it is present,
otherwise using the attribute name
Examples:
import foo # foo imported and bound locally
import foo.bar.baz # foo.bar.baz imported, foo bound locally
import foo.bar.baz as fbb # foo.bar.baz imported and bound as fbb
from foo.bar import baz # foo.bar.baz imported and bound as baz
from foo import attr # foo imported and foo.attr bound as attr
If the list of identifiers is replaced by a star ("'*'"), all public
names defined in the module are bound in the local namespace for the
scope where the "import" statement occurs.
The *public names* defined by a module are determined by checking the
module’s namespace for a variable named "__all__"; if defined, it must
be a sequence of strings which are names defined or imported by that
module. The names given in "__all__" are all considered public and
are required to exist. If "__all__" is not defined, the set of public
names includes all names found in the module’s namespace which do not
begin with an underscore character ("'_'"). "__all__" should contain
the entire public API. It is intended to avoid accidentally exporting
items that are not part of the API (such as library modules which were
imported and used within the module).
The wild card form of import — "from module import *" — is only
allowed at the module level. Attempting to use it in class or
function definitions will raise a "SyntaxError".
When specifying what module to import you do not have to specify the
absolute name of the module. When a module or package is contained
within another package it is possible to make a relative import within
the same top package without having to mention the package name. By
using leading dots in the specified module or package after "from" you
can specify how high to traverse up the current package hierarchy
without specifying exact names. One leading dot means the current
package where the module making the import exists. Two dots means up
one package level. Three dots is up two levels, etc. So if you execute
"from . import mod" from a module in the "pkg" package then you will
end up importing "pkg.mod". If you execute "from ..subpkg2 import mod"
from within "pkg.subpkg1" you will import "pkg.subpkg2.mod". The
specification for relative imports is contained in the Package
Relative Imports section.
"importlib.import_module()" is provided to support applications that
determine dynamically the modules to be loaded.
Raises an auditing event "import" with arguments "module", "filename",
"sys.path", "sys.meta_path", "sys.path_hooks".
Future statements
=================
A *future statement* is a directive to the compiler that a particular
module should be compiled using syntax or semantics that will be
available in a specified future release of Python where the feature
becomes standard.
The future statement is intended to ease migration to future versions
of Python that introduce incompatible changes to the language. It
allows use of the new features on a per-module basis before the
release in which the feature becomes standard.
future_stmt ::= "from" "__future__" "import" feature ["as" identifier]
("," feature ["as" identifier])*
| "from" "__future__" "import" "(" feature ["as" identifier]
("," feature ["as" identifier])* [","] ")"
feature ::= identifier
A future statement must appear near the top of the module. The only
lines that can appear before a future statement are:
* the module docstring (if any),
* comments,
* blank lines, and
* other future statements.
The only feature that requires using the future statement is
"annotations" (see **PEP 563**).
All historical features enabled by the future statement are still
recognized by Python 3. The list includes "absolute_import",
"division", "generators", "generator_stop", "unicode_literals",
"print_function", "nested_scopes" and "with_statement". They are all
redundant because they are always enabled, and only kept for backwards
compatibility.
A future statement is recognized and treated specially at compile
time: Changes to the semantics of core constructs are often
implemented by generating different code. It may even be the case
that a new feature introduces new incompatible syntax (such as a new
reserved word), in which case the compiler may need to parse the
module differently. Such decisions cannot be pushed off until
runtime.
For any given release, the compiler knows which feature names have
been defined, and raises a compile-time error if a future statement
contains a feature not known to it.
The direct runtime semantics are the same as for any import statement:
there is a standard module "__future__", described later, and it will
be imported in the usual way at the time the future statement is
executed.
The interesting runtime semantics depend on the specific feature
enabled by the future statement.
Note that there is nothing special about the statement:
import __future__ [as name]
That is not a future statement; it’s an ordinary import statement with
no special semantics or syntax restrictions.
Code compiled by calls to the built-in functions "exec()" and
"compile()" that occur in a module "M" containing a future statement
will, by default, use the new syntax or semantics associated with the
future statement. This can be controlled by optional arguments to
"compile()" — see the documentation of that function for details.
A future statement typed at an interactive interpreter prompt will
take effect for the rest of the interpreter session. If an
interpreter is started with the "-i" option, is passed a script name
to execute, and the script includes a future statement, it will be in
effect in the interactive session started after the script is
executed.
See also:
**PEP 236** - Back to the __future__
The original proposal for the __future__ mechanism.
a Membership test operations
**************************
The operators "in" and "not in" test for membership. "x in s"
evaluates to "True" if *x* is a member of *s*, and "False" otherwise.
"x not in s" returns the negation of "x in s". All built-in sequences
and set types support this as well as dictionary, for which "in" tests
whether the dictionary has a given key. For container types such as
list, tuple, set, frozenset, dict, or collections.deque, the
expression "x in y" is equivalent to "any(x is e or x == e for e in
y)".
For the string and bytes types, "x in y" is "True" if and only if *x*
is a substring of *y*. An equivalent test is "y.find(x) != -1".
Empty strings are always considered to be a substring of any other
string, so """ in "abc"" will return "True".
For user-defined classes which define the "__contains__()" method, "x
in y" returns "True" if "y.__contains__(x)" returns a true value, and
"False" otherwise.
For user-defined classes which do not define "__contains__()" but do
define "__iter__()", "x in y" is "True" if some value "z", for which
the expression "x is z or x == z" is true, is produced while iterating
over "y". If an exception is raised during the iteration, it is as if
"in" raised that exception.
Lastly, the old-style iteration protocol is tried: if a class defines
"__getitem__()", "x in y" is "True" if and only if there is a non-
negative integer index *i* such that "x is y[i] or x == y[i]", and no
lower integer index raises the "IndexError" exception. (If any other
exception is raised, it is as if "in" raised that exception).
The operator "not in" is defined to have the inverse truth value of
"in".
aV Integer literals
****************
Integer literals are described by the following lexical definitions:
integer ::= decinteger | bininteger | octinteger | hexinteger
decinteger ::= nonzerodigit (["_"] digit)* | "0"+ (["_"] "0")*
bininteger ::= "0" ("b" | "B") (["_"] bindigit)+
octinteger ::= "0" ("o" | "O") (["_"] octdigit)+
hexinteger ::= "0" ("x" | "X") (["_"] hexdigit)+
nonzerodigit ::= "1"..."9"
digit ::= "0"..."9"
bindigit ::= "0" | "1"
octdigit ::= "0"..."7"
hexdigit ::= digit | "a"..."f" | "A"..."F"
There is no limit for the length of integer literals apart from what
can be stored in available memory.
Underscores are ignored for determining the numeric value of the
literal. They can be used to group digits for enhanced readability.
One underscore can occur between digits, and after base specifiers
like "0x".
Note that leading zeros in a non-zero decimal number are not allowed.
This is for disambiguation with C-style octal literals, which Python
used before version 3.0.
Some examples of integer literals:
7 2147483647 0o177 0b100110111
3 79228162514264337593543950336 0o377 0xdeadbeef
100_000_000_000 0b_1110_0101
Changed in version 3.6: Underscores are now allowed for grouping
purposes in literals.
a^ Lambdas
*******
lambda_expr ::= "lambda" [parameter_list] ":" expression
lambda_expr_nocond ::= "lambda" [parameter_list] ":" expression_nocond
Lambda expressions (sometimes called lambda forms) are used to create
anonymous functions. The expression "lambda parameters: expression"
yields a function object. The unnamed object behaves like a function
object defined with:
def <lambda>(parameters):
return expression
See section Function definitions for the syntax of parameter lists.
Note that functions created with lambda expressions cannot contain
statements or annotations.
a/ List displays
*************
A list display is a possibly empty series of expressions enclosed in
square brackets:
list_display ::= "[" [starred_list | comprehension] "]"
A list display yields a new list object, the contents being specified
by either a list of expressions or a comprehension. When a comma-
separated list of expressions is supplied, its elements are evaluated
from left to right and placed into the list object in that order.
When a comprehension is supplied, the list is constructed from the
elements resulting from the comprehension.
u� Naming and binding
******************
Binding of names
================
*Names* refer to objects. Names are introduced by name binding
operations.
The following constructs bind names: formal parameters to functions,
"import" statements, class and function definitions (these bind the
class or function name in the defining block), and targets that are
identifiers if occurring in an assignment, "for" loop header, or after
"as" in a "with" statement or "except" clause. The "import" statement
of the form "from ... import *" binds all names defined in the
imported module, except those beginning with an underscore. This form
may only be used at the module level.
A target occurring in a "del" statement is also considered bound for
this purpose (though the actual semantics are to unbind the name).
Each assignment or import statement occurs within a block defined by a
class or function definition or at the module level (the top-level
code block).
If a name is bound in a block, it is a local variable of that block,
unless declared as "nonlocal" or "global". If a name is bound at the
module level, it is a global variable. (The variables of the module
code block are local and global.) If a variable is used in a code
block but not defined there, it is a *free variable*.
Each occurrence of a name in the program text refers to the *binding*
of that name established by the following name resolution rules.
Resolution of names
===================
A *scope* defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. If the
definition occurs in a function block, the scope extends to any blocks
contained within the defining one, unless a contained block introduces
a different binding for the name.
When a name is used in a code block, it is resolved using the nearest
enclosing scope. The set of all such scopes visible to a code block
is called the block’s *environment*.
When a name is not found at all, a "NameError" exception is raised. If
the current scope is a function scope, and the name refers to a local
variable that has not yet been bound to a value at the point where the
name is used, an "UnboundLocalError" exception is raised.
"UnboundLocalError" is a subclass of "NameError".
If a name binding operation occurs anywhere within a code block, all
uses of the name within the block are treated as references to the
current block. This can lead to errors when a name is used within a
block before it is bound. This rule is subtle. Python lacks
declarations and allows name binding operations to occur anywhere
within a code block. The local variables of a code block can be
determined by scanning the entire text of the block for name binding
operations.
If the "global" statement occurs within a block, all uses of the name
specified in the statement refer to the binding of that name in the
top-level namespace. Names are resolved in the top-level namespace by
searching the global namespace, i.e. the namespace of the module
containing the code block, and the builtins namespace, the namespace
of the module "builtins". The global namespace is searched first. If
the name is not found there, the builtins namespace is searched. The
"global" statement must precede all uses of the name.
The "global" statement has the same scope as a name binding operation
in the same block. If the nearest enclosing scope for a free variable
contains a global statement, the free variable is treated as a global.
The "nonlocal" statement causes corresponding names to refer to
previously bound variables in the nearest enclosing function scope.
"SyntaxError" is raised at compile time if the given name does not
exist in any enclosing function scope.
The namespace for a module is automatically created the first time a
module is imported. The main module for a script is always called
"__main__".
Class definition blocks and arguments to "exec()" and "eval()" are
special in the context of name resolution. A class definition is an
executable statement that may use and define names. These references
follow the normal rules for name resolution with an exception that
unbound local variables are looked up in the global namespace. The
namespace of the class definition becomes the attribute dictionary of
the class. The scope of names defined in a class block is limited to
the class block; it does not extend to the code blocks of methods –
this includes comprehensions and generator expressions since they are
implemented using a function scope. This means that the following
will fail:
class A:
a = 42
b = list(a + i for i in range(10))
Builtins and restricted execution
=================================
**CPython implementation detail:** Users should not touch
"__builtins__"; it is strictly an implementation detail. Users
wanting to override values in the builtins namespace should "import"
the "builtins" module and modify its attributes appropriately.
The builtins namespace associated with the execution of a code block
is actually found by looking up the name "__builtins__" in its global
namespace; this should be a dictionary or a module (in the latter case
the module’s dictionary is used). By default, when in the "__main__"
module, "__builtins__" is the built-in module "builtins"; when in any
other module, "__builtins__" is an alias for the dictionary of the
"builtins" module itself.
Interaction with dynamic features
=================================
Name resolution of free variables occurs at runtime, not at compile
time. This means that the following code will print 42:
i = 10
def f():
print(i)
i = 42
f()
The "eval()" and "exec()" functions do not have access to the full
environment for resolving names. Names may be resolved in the local
and global namespaces of the caller. Free variables are not resolved
in the nearest enclosing namespace, but in the global namespace. [1]
The "exec()" and "eval()" functions have optional arguments to
override the global and local namespace. If only one namespace is
specified, it is used for both.
a� The "nonlocal" statement
************************
nonlocal_stmt ::= "nonlocal" identifier ("," identifier)*
The "nonlocal" statement causes the listed identifiers to refer to
previously bound variables in the nearest enclosing scope excluding
globals. This is important because the default behavior for binding is
to search the local namespace first. The statement allows
encapsulated code to rebind variables outside of the local scope
besides the global (module) scope.
Names listed in a "nonlocal" statement, unlike those listed in a
"global" statement, must refer to pre-existing bindings in an
enclosing scope (the scope in which a new binding should be created
cannot be determined unambiguously).
Names listed in a "nonlocal" statement must not collide with pre-
existing bindings in the local scope.
See also:
**PEP 3104** - Access to Names in Outer Scopes
The specification for the "nonlocal" statement.
u� Numeric literals
****************
There are three types of numeric literals: integers, floating point
numbers, and imaginary numbers. There are no complex literals
(complex numbers can be formed by adding a real number and an
imaginary number).
Note that numeric literals do not include a sign; a phrase like "-1"
is actually an expression composed of the unary operator ‘"-"’ and the
literal "1".
u Emulating numeric types
***********************
The following methods can be defined to emulate numeric objects.
Methods corresponding to operations that are not supported by the
particular kind of number implemented (e.g., bitwise operations for
non-integral numbers) should be left undefined.
object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__matmul__(self, other)
object.__truediv__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|"). For instance, to
evaluate the expression "x + y", where *x* is an instance of a
class that has an "__add__()" method, "x.__add__(y)" is called.
The "__divmod__()" method should be the equivalent to using
"__floordiv__()" and "__mod__()"; it should not be related to
"__truediv__()". Note that "__pow__()" should be defined to accept
an optional third argument if the ternary version of the built-in
"pow()" function is to be supported.
If one of those methods does not support the operation with the
supplied arguments, it should return "NotImplemented".
object.__radd__(self, other)
object.__rsub__(self, other)
object.__rmul__(self, other)
object.__rmatmul__(self, other)
object.__rtruediv__(self, other)
object.__rfloordiv__(self, other)
object.__rmod__(self, other)
object.__rdivmod__(self, other)
object.__rpow__(self, other[, modulo])
object.__rlshift__(self, other)
object.__rrshift__(self, other)
object.__rand__(self, other)
object.__rxor__(self, other)
object.__ror__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|") with reflected (swapped)
operands. These functions are only called if the left operand does
not support the corresponding operation [3] and the operands are of
different types. [4] For instance, to evaluate the expression "x -
y", where *y* is an instance of a class that has an "__rsub__()"
method, "y.__rsub__(x)" is called if "x.__sub__(y)" returns
*NotImplemented*.
Note that ternary "pow()" will not try calling "__rpow__()" (the
coercion rules would become too complicated).
Note:
If the right operand’s type is a subclass of the left operand’s
type and that subclass provides a different implementation of the
reflected method for the operation, this method will be called
before the left operand’s non-reflected method. This behavior
allows subclasses to override their ancestors’ operations.
object.__iadd__(self, other)
object.__isub__(self, other)
object.__imul__(self, other)
object.__imatmul__(self, other)
object.__itruediv__(self, other)
object.__ifloordiv__(self, other)
object.__imod__(self, other)
object.__ipow__(self, other[, modulo])
object.__ilshift__(self, other)
object.__irshift__(self, other)
object.__iand__(self, other)
object.__ixor__(self, other)
object.__ior__(self, other)
These methods are called to implement the augmented arithmetic
assignments ("+=", "-=", "*=", "@=", "/=", "//=", "%=", "**=",
"<<=", ">>=", "&=", "^=", "|="). These methods should attempt to
do the operation in-place (modifying *self*) and return the result
(which could be, but does not have to be, *self*). If a specific
method is not defined, the augmented assignment falls back to the
normal methods. For instance, if *x* is an instance of a class
with an "__iadd__()" method, "x += y" is equivalent to "x =
x.__iadd__(y)" . Otherwise, "x.__add__(y)" and "y.__radd__(x)" are
considered, as with the evaluation of "x + y". In certain
situations, augmented assignment can result in unexpected errors
(see Why does a_tuple[i] += [‘item’] raise an exception when the
addition works?), but this behavior is in fact part of the data
model.
Note:
Due to a bug in the dispatching mechanism for "**=", a class that
defines "__ipow__()" but returns "NotImplemented" would fail to
fall back to "x.__pow__(y)" and "y.__rpow__(x)". This bug is
fixed in Python 3.10.
object.__neg__(self)
object.__pos__(self)
object.__abs__(self)
object.__invert__(self)
Called to implement the unary arithmetic operations ("-", "+",
"abs()" and "~").
object.__complex__(self)
object.__int__(self)
object.__float__(self)
Called to implement the built-in functions "complex()", "int()" and
"float()". Should return a value of the appropriate type.
object.__index__(self)
Called to implement "operator.index()", and whenever Python needs
to losslessly convert the numeric object to an integer object (such
as in slicing, or in the built-in "bin()", "hex()" and "oct()"
functions). Presence of this method indicates that the numeric
object is an integer type. Must return an integer.
If "__int__()", "__float__()" and "__complex__()" are not defined
then corresponding built-in functions "int()", "float()" and
"complex()" fall back to "__index__()".
object.__round__(self[, ndigits])
object.__trunc__(self)
object.__floor__(self)
object.__ceil__(self)
Called to implement the built-in function "round()" and "math"
functions "trunc()", "floor()" and "ceil()". Unless *ndigits* is
passed to "__round__()" all these methods should return the value
of the object truncated to an "Integral" (typically an "int").
The built-in function "int()" falls back to "__trunc__()" if
neither "__int__()" nor "__index__()" is defined.
u Objects, values and types
*************************
*Objects* are Python’s abstraction for data. All data in a Python
program is represented by objects or by relations between objects. (In
a sense, and in conformance to Von Neumann’s model of a “stored
program computer”, code is also represented by objects.)
Every object has an identity, a type and a value. An object’s
*identity* never changes once it has been created; you may think of it
as the object’s address in memory. The ‘"is"’ operator compares the
identity of two objects; the "id()" function returns an integer
representing its identity.
**CPython implementation detail:** For CPython, "id(x)" is the memory
address where "x" is stored.
An object’s type determines the operations that the object supports
(e.g., “does it have a length?”) and also defines the possible values
for objects of that type. The "type()" function returns an object’s
type (which is an object itself). Like its identity, an object’s
*type* is also unchangeable. [1]
The *value* of some objects can change. Objects whose value can
change are said to be *mutable*; objects whose value is unchangeable
once they are created are called *immutable*. (The value of an
immutable container object that contains a reference to a mutable
object can change when the latter’s value is changed; however the
container is still considered immutable, because the collection of
objects it contains cannot be changed. So, immutability is not
strictly the same as having an unchangeable value, it is more subtle.)
An object’s mutability is determined by its type; for instance,
numbers, strings and tuples are immutable, while dictionaries and
lists are mutable.
Objects are never explicitly destroyed; however, when they become
unreachable they may be garbage-collected. An implementation is
allowed to postpone garbage collection or omit it altogether — it is a
matter of implementation quality how garbage collection is
implemented, as long as no objects are collected that are still
reachable.
**CPython implementation detail:** CPython currently uses a reference-
counting scheme with (optional) delayed detection of cyclically linked
garbage, which collects most objects as soon as they become
unreachable, but is not guaranteed to collect garbage containing
circular references. See the documentation of the "gc" module for
information on controlling the collection of cyclic garbage. Other
implementations act differently and CPython may change. Do not depend
on immediate finalization of objects when they become unreachable (so
you should always close files explicitly).
Note that the use of the implementation’s tracing or debugging
facilities may keep objects alive that would normally be collectable.
Also note that catching an exception with a ‘"try"…"except"’ statement
may keep objects alive.
Some objects contain references to “external” resources such as open
files or windows. It is understood that these resources are freed
when the object is garbage-collected, but since garbage collection is
not guaranteed to happen, such objects also provide an explicit way to
release the external resource, usually a "close()" method. Programs
are strongly recommended to explicitly close such objects. The
‘"try"…"finally"’ statement and the ‘"with"’ statement provide
convenient ways to do this.
Some objects contain references to other objects; these are called
*containers*. Examples of containers are tuples, lists and
dictionaries. The references are part of a container’s value. In
most cases, when we talk about the value of a container, we imply the
values, not the identities of the contained objects; however, when we
talk about the mutability of a container, only the identities of the
immediately contained objects are implied. So, if an immutable
container (like a tuple) contains a reference to a mutable object, its
value changes if that mutable object is changed.
Types affect almost all aspects of object behavior. Even the
importance of object identity is affected in some sense: for immutable
types, operations that compute new values may actually return a
reference to any existing object with the same type and value, while
for mutable objects this is not allowed. E.g., after "a = 1; b = 1",
"a" and "b" may or may not refer to the same object with the value
one, depending on the implementation, but after "c = []; d = []", "c"
and "d" are guaranteed to refer to two different, unique, newly
created empty lists. (Note that "c = d = []" assigns the same object
to both "c" and "d".)
u� Operator precedence
*******************
The following table summarizes the operator precedence in Python, from
lowest precedence (least binding) to highest precedence (most
binding). Operators in the same box have the same precedence. Unless
the syntax is explicitly given, operators are binary. Operators in
the same box group left to right (except for exponentiation, which
groups from right to left).
Note that comparisons, membership tests, and identity tests, all have
the same precedence and have a left-to-right chaining feature as
described in the Comparisons section.
+-------------------------------------------------+---------------------------------------+
| Operator | Description |
|=================================================|=======================================|
| ":=" | Assignment expression |
+-------------------------------------------------+---------------------------------------+
| "lambda" | Lambda expression |
+-------------------------------------------------+---------------------------------------+
| "if" – "else" | Conditional expression |
+-------------------------------------------------+---------------------------------------+
| "or" | Boolean OR |
+-------------------------------------------------+---------------------------------------+
| "and" | Boolean AND |
+-------------------------------------------------+---------------------------------------+
| "not" "x" | Boolean NOT |
+-------------------------------------------------+---------------------------------------+
| "in", "not in", "is", "is not", "<", "<=", ">", | Comparisons, including membership |
| ">=", "!=", "==" | tests and identity tests |
+-------------------------------------------------+---------------------------------------+
| "|" | Bitwise OR |
+-------------------------------------------------+---------------------------------------+
| "^" | Bitwise XOR |
+-------------------------------------------------+---------------------------------------+
| "&" | Bitwise AND |
+-------------------------------------------------+---------------------------------------+
| "<<", ">>" | Shifts |
+-------------------------------------------------+---------------------------------------+
| "+", "-" | Addition and subtraction |
+-------------------------------------------------+---------------------------------------+
| "*", "@", "/", "//", "%" | Multiplication, matrix |
| | multiplication, division, floor |
| | division, remainder [5] |
+-------------------------------------------------+---------------------------------------+
| "+x", "-x", "~x" | Positive, negative, bitwise NOT |
+-------------------------------------------------+---------------------------------------+
| "**" | Exponentiation [6] |
+-------------------------------------------------+---------------------------------------+
| "await" "x" | Await expression |
+-------------------------------------------------+---------------------------------------+
| "x[index]", "x[index:index]", | Subscription, slicing, call, |
| "x(arguments...)", "x.attribute" | attribute reference |
+-------------------------------------------------+---------------------------------------+
| "(expressions...)", "[expressions...]", "{key: | Binding or parenthesized expression, |
| value...}", "{expressions...}" | list display, dictionary display, set |
| | display |
+-------------------------------------------------+---------------------------------------+
-[ Footnotes ]-
[1] While "abs(x%y) < abs(y)" is true mathematically, for floats it
may not be true numerically due to roundoff. For example, and
assuming a platform on which a Python float is an IEEE 754 double-
precision number, in order that "-1e-100 % 1e100" have the same
sign as "1e100", the computed result is "-1e-100 + 1e100", which
is numerically exactly equal to "1e100". The function
"math.fmod()" returns a result whose sign matches the sign of the
first argument instead, and so returns "-1e-100" in this case.
Which approach is more appropriate depends on the application.
[2] If x is very close to an exact integer multiple of y, it’s
possible for "x//y" to be one larger than "(x-x%y)//y" due to
rounding. In such cases, Python returns the latter result, in
order to preserve that "divmod(x,y)[0] * y + x % y" be very close
to "x".
[3] The Unicode standard distinguishes between *code points* (e.g.
U+0041) and *abstract characters* (e.g. “LATIN CAPITAL LETTER A”).
While most abstract characters in Unicode are only represented
using one code point, there is a number of abstract characters
that can in addition be represented using a sequence of more than
one code point. For example, the abstract character “LATIN
CAPITAL LETTER C WITH CEDILLA” can be represented as a single
*precomposed character* at code position U+00C7, or as a sequence
of a *base character* at code position U+0043 (LATIN CAPITAL
LETTER C), followed by a *combining character* at code position
U+0327 (COMBINING CEDILLA).
The comparison operators on strings compare at the level of
Unicode code points. This may be counter-intuitive to humans. For
example, ""\u00C7" == "\u0043\u0327"" is "False", even though both
strings represent the same abstract character “LATIN CAPITAL
LETTER C WITH CEDILLA”.
To compare strings at the level of abstract characters (that is,
in a way intuitive to humans), use "unicodedata.normalize()".
[4] Due to automatic garbage-collection, free lists, and the dynamic
nature of descriptors, you may notice seemingly unusual behaviour
in certain uses of the "is" operator, like those involving
comparisons between instance methods, or constants. Check their
documentation for more info.
[5] The "%" operator is also used for string formatting; the same
precedence applies.
[6] The power operator "**" binds less tightly than an arithmetic or
bitwise unary operator on its right, that is, "2**-1" is "0.5".
uw The "pass" statement
********************
pass_stmt ::= "pass"
"pass" is a null operation — when it is executed, nothing happens. It
is useful as a placeholder when a statement is required syntactically,
but no code needs to be executed, for example:
def f(arg): pass # a function that does nothing (yet)
class C: pass # a class with no methods (yet)
a� The power operator
******************
The power operator binds more tightly than unary operators on its
left; it binds less tightly than unary operators on its right. The
syntax is:
power ::= (await_expr | primary) ["**" u_expr]
Thus, in an unparenthesized sequence of power and unary operators, the
operators are evaluated from right to left (this does not constrain
the evaluation order for the operands): "-1**2" results in "-1".
The power operator has the same semantics as the built-in "pow()"
function, when called with two arguments: it yields its left argument
raised to the power of its right argument. The numeric arguments are
first converted to a common type, and the result is of that type.
For int operands, the result has the same type as the operands unless
the second argument is negative; in that case, all arguments are
converted to float and a float result is delivered. For example,
"10**2" returns "100", but "10**-2" returns "0.01".
Raising "0.0" to a negative power results in a "ZeroDivisionError".
Raising a negative number to a fractional power results in a "complex"
number. (In earlier versions it raised a "ValueError".)
uJ
The "raise" statement
*********************
raise_stmt ::= "raise" [expression ["from" expression]]
If no expressions are present, "raise" re-raises the last exception
that was active in the current scope. If no exception is active in
the current scope, a "RuntimeError" exception is raised indicating
that this is an error.
Otherwise, "raise" evaluates the first expression as the exception
object. It must be either a subclass or an instance of
"BaseException". If it is a class, the exception instance will be
obtained when needed by instantiating the class with no arguments.
The *type* of the exception is the exception instance’s class, the
*value* is the instance itself.
A traceback object is normally created automatically when an exception
is raised and attached to it as the "__traceback__" attribute, which
is writable. You can create an exception and set your own traceback in
one step using the "with_traceback()" exception method (which returns
the same exception instance, with its traceback set to its argument),
like so:
raise Exception("foo occurred").with_traceback(tracebackobj)
The "from" clause is used for exception chaining: if given, the second
*expression* must be another exception class or instance. If the
second expression is an exception instance, it will be attached to the
raised exception as the "__cause__" attribute (which is writable). If
the expression is an exception class, the class will be instantiated
and the resulting exception instance will be attached to the raised
exception as the "__cause__" attribute. If the raised exception is not
handled, both exceptions will be printed:
>>> try:
... print(1 / 0)
... except Exception as exc:
... raise RuntimeError("Something bad happened") from exc
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
A similar mechanism works implicitly if an exception is raised inside
an exception handler or a "finally" clause: the previous exception is
then attached as the new exception’s "__context__" attribute:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something bad happened")
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
Exception chaining can be explicitly suppressed by specifying "None"
in the "from" clause:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something bad happened") from None
...
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
RuntimeError: Something bad happened
Additional information on exceptions can be found in section
Exceptions, and information about handling exceptions is in section
The try statement.
Changed in version 3.3: "None" is now permitted as "Y" in "raise X
from Y".
New in version 3.3: The "__suppress_context__" attribute to suppress
automatic display of the exception context.
a The "return" statement
**********************
return_stmt ::= "return" [expression_list]
"return" may only occur syntactically nested in a function definition,
not within a nested class definition.
If an expression list is present, it is evaluated, else "None" is
substituted.
"return" leaves the current function call with the expression list (or
"None") as return value.
When "return" passes control out of a "try" statement with a "finally"
clause, that "finally" clause is executed before really leaving the
function.
In a generator function, the "return" statement indicates that the
generator is done and will cause "StopIteration" to be raised. The
returned value (if any) is used as an argument to construct
"StopIteration" and becomes the "StopIteration.value" attribute.
In an asynchronous generator function, an empty "return" statement
indicates that the asynchronous generator is done and will cause
"StopAsyncIteration" to be raised. A non-empty "return" statement is
a syntax error in an asynchronous generator function.
u� Emulating container types
*************************
The following methods can be defined to implement container objects.
Containers usually are sequences (such as lists or tuples) or mappings
(like dictionaries), but can represent other containers as well. The
first set of methods is used either to emulate a sequence or to
emulate a mapping; the difference is that for a sequence, the
allowable keys should be the integers *k* for which "0 <= k < N" where
*N* is the length of the sequence, or slice objects, which define a
range of items. It is also recommended that mappings provide the
methods "keys()", "values()", "items()", "get()", "clear()",
"setdefault()", "pop()", "popitem()", "copy()", and "update()"
behaving similar to those for Python’s standard dictionary objects.
The "collections.abc" module provides a "MutableMapping" abstract base
class to help create those methods from a base set of "__getitem__()",
"__setitem__()", "__delitem__()", and "keys()". Mutable sequences
should provide methods "append()", "count()", "index()", "extend()",
"insert()", "pop()", "remove()", "reverse()" and "sort()", like Python
standard list objects. Finally, sequence types should implement
addition (meaning concatenation) and multiplication (meaning
repetition) by defining the methods "__add__()", "__radd__()",
"__iadd__()", "__mul__()", "__rmul__()" and "__imul__()" described
below; they should not define other numerical operators. It is
recommended that both mappings and sequences implement the
"__contains__()" method to allow efficient use of the "in" operator;
for mappings, "in" should search the mapping’s keys; for sequences, it
should search through the values. It is further recommended that both
mappings and sequences implement the "__iter__()" method to allow
efficient iteration through the container; for mappings, "__iter__()"
should iterate through the object’s keys; for sequences, it should
iterate through the values.
object.__len__(self)
Called to implement the built-in function "len()". Should return
the length of the object, an integer ">=" 0. Also, an object that
doesn’t define a "__bool__()" method and whose "__len__()" method
returns zero is considered to be false in a Boolean context.
**CPython implementation detail:** In CPython, the length is
required to be at most "sys.maxsize". If the length is larger than
"sys.maxsize" some features (such as "len()") may raise
"OverflowError". To prevent raising "OverflowError" by truth value
testing, an object must define a "__bool__()" method.
object.__length_hint__(self)
Called to implement "operator.length_hint()". Should return an
estimated length for the object (which may be greater or less than
the actual length). The length must be an integer ">=" 0. The
return value may also be "NotImplemented", which is treated the
same as if the "__length_hint__" method didn’t exist at all. This
method is purely an optimization and is never required for
correctness.
New in version 3.4.
Note:
Slicing is done exclusively with the following three methods. A
call like
a[1:2] = b
is translated to
a[slice(1, 2, None)] = b
and so forth. Missing slice items are always filled in with "None".
object.__getitem__(self, key)
Called to implement evaluation of "self[key]". For sequence types,
the accepted keys should be integers and slice objects. Note that
the special interpretation of negative indexes (if the class wishes
to emulate a sequence type) is up to the "__getitem__()" method. If
*key* is of an inappropriate type, "TypeError" may be raised; if of
a value outside the set of indexes for the sequence (after any
special interpretation of negative values), "IndexError" should be
raised. For mapping types, if *key* is missing (not in the
container), "KeyError" should be raised.
Note:
"for" loops expect that an "IndexError" will be raised for
illegal indexes to allow proper detection of the end of the
sequence.
object.__setitem__(self, key, value)
Called to implement assignment to "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support changes to the values for keys, or if new keys
can be added, or for sequences if elements can be replaced. The
same exceptions should be raised for improper *key* values as for
the "__getitem__()" method.
object.__delitem__(self, key)
Called to implement deletion of "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support removal of keys, or for sequences if elements
can be removed from the sequence. The same exceptions should be
raised for improper *key* values as for the "__getitem__()" method.
object.__missing__(self, key)
Called by "dict"."__getitem__()" to implement "self[key]" for dict
subclasses when key is not in the dictionary.
object.__iter__(self)
This method is called when an iterator is required for a container.
This method should return a new iterator object that can iterate
over all the objects in the container. For mappings, it should
iterate over the keys of the container.
Iterator objects also need to implement this method; they are
required to return themselves. For more information on iterator
objects, see Iterator Types.
object.__reversed__(self)
Called (if present) by the "reversed()" built-in to implement
reverse iteration. It should return a new iterator object that
iterates over all the objects in the container in reverse order.
If the "__reversed__()" method is not provided, the "reversed()"
built-in will fall back to using the sequence protocol ("__len__()"
and "__getitem__()"). Objects that support the sequence protocol
should only provide "__reversed__()" if they can provide an
implementation that is more efficient than the one provided by
"reversed()".
The membership test operators ("in" and "not in") are normally
implemented as an iteration through a container. However, container
objects can supply the following special method with a more efficient
implementation, which also does not require the object be iterable.
object.__contains__(self, item)
Called to implement membership test operators. Should return true
if *item* is in *self*, false otherwise. For mapping objects, this
should consider the keys of the mapping rather than the values or
the key-item pairs.
For objects that don’t define "__contains__()", the membership test
first tries iteration via "__iter__()", then the old sequence
iteration protocol via "__getitem__()", see this section in the
language reference.
a� Shifting operations
*******************
The shifting operations have lower priority than the arithmetic
operations:
shift_expr ::= a_expr | shift_expr ("<<" | ">>") a_expr
These operators accept integers as arguments. They shift the first
argument to the left or right by the number of bits given by the
second argument.
A right shift by *n* bits is defined as floor division by "pow(2,n)".
A left shift by *n* bits is defined as multiplication with "pow(2,n)".
a� Slicings
********
A slicing selects a range of items in a sequence object (e.g., a
string, tuple or list). Slicings may be used as expressions or as
targets in assignment or "del" statements. The syntax for a slicing:
slicing ::= primary "[" slice_list "]"
slice_list ::= slice_item ("," slice_item)* [","]
slice_item ::= expression | proper_slice
proper_slice ::= [lower_bound] ":" [upper_bound] [ ":" [stride] ]
lower_bound ::= expression
upper_bound ::= expression
stride ::= expression
There is ambiguity in the formal syntax here: anything that looks like
an expression list also looks like a slice list, so any subscription
can be interpreted as a slicing. Rather than further complicating the
syntax, this is disambiguated by defining that in this case the
interpretation as a subscription takes priority over the
interpretation as a slicing (this is the case if the slice list
contains no proper slice).
The semantics for a slicing are as follows. The primary is indexed
(using the same "__getitem__()" method as normal subscription) with a
key that is constructed from the slice list, as follows. If the slice
list contains at least one comma, the key is a tuple containing the
conversion of the slice items; otherwise, the conversion of the lone
slice item is the key. The conversion of a slice item that is an
expression is that expression. The conversion of a proper slice is a
slice object (see section The standard type hierarchy) whose "start",
"stop" and "step" attributes are the values of the expressions given
as lower bound, upper bound and stride, respectively, substituting
"None" for missing expressions.
u Special Attributes
******************
The implementation adds a few special read-only attributes to several
object types, where they are relevant. Some of these are not reported
by the "dir()" built-in function.
object.__dict__
A dictionary or other mapping object used to store an object’s
(writable) attributes.
instance.__class__
The class to which a class instance belongs.
class.__bases__
The tuple of base classes of a class object.
definition.__name__
The name of the class, function, method, descriptor, or generator
instance.
definition.__qualname__
The *qualified name* of the class, function, method, descriptor, or
generator instance.
New in version 3.3.
class.__mro__
This attribute is a tuple of classes that are considered when
looking for base classes during method resolution.
class.mro()
This method can be overridden by a metaclass to customize the
method resolution order for its instances. It is called at class
instantiation, and its result is stored in "__mro__".
class.__subclasses__()
Each class keeps a list of weak references to its immediate
subclasses. This method returns a list of all those references
still alive. Example:
>>> int.__subclasses__()
[<class 'bool'>]
u�� Special method names
********************
A class can implement certain operations that are invoked by special
syntax (such as arithmetic operations or subscripting and slicing) by
defining methods with special names. This is Python’s approach to
*operator overloading*, allowing classes to define their own behavior
with respect to language operators. For instance, if a class defines
a method named "__getitem__()", and "x" is an instance of this class,
then "x[i]" is roughly equivalent to "type(x).__getitem__(x, i)".
Except where mentioned, attempts to execute an operation raise an
exception when no appropriate method is defined (typically
"AttributeError" or "TypeError").
Setting a special method to "None" indicates that the corresponding
operation is not available. For example, if a class sets "__iter__()"
to "None", the class is not iterable, so calling "iter()" on its
instances will raise a "TypeError" (without falling back to
"__getitem__()"). [2]
When implementing a class that emulates any built-in type, it is
important that the emulation only be implemented to the degree that it
makes sense for the object being modelled. For example, some
sequences may work well with retrieval of individual elements, but
extracting a slice may not make sense. (One example of this is the
"NodeList" interface in the W3C’s Document Object Model.)
Basic customization
===================
object.__new__(cls[, ...])
Called to create a new instance of class *cls*. "__new__()" is a
static method (special-cased so you need not declare it as such)
that takes the class of which an instance was requested as its
first argument. The remaining arguments are those passed to the
object constructor expression (the call to the class). The return
value of "__new__()" should be the new object instance (usually an
instance of *cls*).
Typical implementations create a new instance of the class by
invoking the superclass’s "__new__()" method using
"super().__new__(cls[, ...])" with appropriate arguments and then
modifying the newly-created instance as necessary before returning
it.
If "__new__()" is invoked during object construction and it returns
an instance of *cls*, then the new instance’s "__init__()" method
will be invoked like "__init__(self[, ...])", where *self* is the
new instance and the remaining arguments are the same as were
passed to the object constructor.
If "__new__()" does not return an instance of *cls*, then the new
instance’s "__init__()" method will not be invoked.
"__new__()" is intended mainly to allow subclasses of immutable
types (like int, str, or tuple) to customize instance creation. It
is also commonly overridden in custom metaclasses in order to
customize class creation.
object.__init__(self[, ...])
Called after the instance has been created (by "__new__()"), but
before it is returned to the caller. The arguments are those
passed to the class constructor expression. If a base class has an
"__init__()" method, the derived class’s "__init__()" method, if
any, must explicitly call it to ensure proper initialization of the
base class part of the instance; for example:
"super().__init__([args...])".
Because "__new__()" and "__init__()" work together in constructing
objects ("__new__()" to create it, and "__init__()" to customize
it), no non-"None" value may be returned by "__init__()"; doing so
will cause a "TypeError" to be raised at runtime.
object.__del__(self)
Called when the instance is about to be destroyed. This is also
called a finalizer or (improperly) a destructor. If a base class
has a "__del__()" method, the derived class’s "__del__()" method,
if any, must explicitly call it to ensure proper deletion of the
base class part of the instance.
It is possible (though not recommended!) for the "__del__()" method
to postpone destruction of the instance by creating a new reference
to it. This is called object *resurrection*. It is
implementation-dependent whether "__del__()" is called a second
time when a resurrected object is about to be destroyed; the
current *CPython* implementation only calls it once.
It is not guaranteed that "__del__()" methods are called for
objects that still exist when the interpreter exits.
Note:
"del x" doesn’t directly call "x.__del__()" — the former
decrements the reference count for "x" by one, and the latter is
only called when "x"’s reference count reaches zero.
**CPython implementation detail:** It is possible for a reference
cycle to prevent the reference count of an object from going to
zero. In this case, the cycle will be later detected and deleted
by the *cyclic garbage collector*. A common cause of reference
cycles is when an exception has been caught in a local variable.
The frame’s locals then reference the exception, which references
its own traceback, which references the locals of all frames caught
in the traceback.
See also: Documentation for the "gc" module.
Warning:
Due to the precarious circumstances under which "__del__()"
methods are invoked, exceptions that occur during their execution
are ignored, and a warning is printed to "sys.stderr" instead.
In particular:
* "__del__()" can be invoked when arbitrary code is being
executed, including from any arbitrary thread. If "__del__()"
needs to take a lock or invoke any other blocking resource, it
may deadlock as the resource may already be taken by the code
that gets interrupted to execute "__del__()".
* "__del__()" can be executed during interpreter shutdown. As a
consequence, the global variables it needs to access (including
other modules) may already have been deleted or set to "None".
Python guarantees that globals whose name begins with a single
underscore are deleted from their module before other globals
are deleted; if no other references to such globals exist, this
may help in assuring that imported modules are still available
at the time when the "__del__()" method is called.
object.__repr__(self)
Called by the "repr()" built-in function to compute the “official”
string representation of an object. If at all possible, this
should look like a valid Python expression that could be used to
recreate an object with the same value (given an appropriate
environment). If this is not possible, a string of the form
"<...some useful description...>" should be returned. The return
value must be a string object. If a class defines "__repr__()" but
not "__str__()", then "__repr__()" is also used when an “informal”
string representation of instances of that class is required.
This is typically used for debugging, so it is important that the
representation is information-rich and unambiguous.
object.__str__(self)
Called by "str(object)" and the built-in functions "format()" and
"print()" to compute the “informal” or nicely printable string
representation of an object. The return value must be a string
object.
This method differs from "object.__repr__()" in that there is no
expectation that "__str__()" return a valid Python expression: a
more convenient or concise representation can be used.
The default implementation defined by the built-in type "object"
calls "object.__repr__()".
object.__bytes__(self)
Called by bytes to compute a byte-string representation of an
object. This should return a "bytes" object.
object.__format__(self, format_spec)
Called by the "format()" built-in function, and by extension,
evaluation of formatted string literals and the "str.format()"
method, to produce a “formatted” string representation of an
object. The *format_spec* argument is a string that contains a
description of the formatting options desired. The interpretation
of the *format_spec* argument is up to the type implementing
"__format__()", however most classes will either delegate
formatting to one of the built-in types, or use a similar
formatting option syntax.
See Format Specification Mini-Language for a description of the
standard formatting syntax.
The return value must be a string object.
Changed in version 3.4: The __format__ method of "object" itself
raises a "TypeError" if passed any non-empty string.
Changed in version 3.7: "object.__format__(x, '')" is now
equivalent to "str(x)" rather than "format(str(self), '')".
object.__lt__(self, other)
object.__le__(self, other)
object.__eq__(self, other)
object.__ne__(self, other)
object.__gt__(self, other)
object.__ge__(self, other)
These are the so-called “rich comparison” methods. The
correspondence between operator symbols and method names is as
follows: "x<y" calls "x.__lt__(y)", "x<=y" calls "x.__le__(y)",
"x==y" calls "x.__eq__(y)", "x!=y" calls "x.__ne__(y)", "x>y" calls
"x.__gt__(y)", and "x>=y" calls "x.__ge__(y)".
A rich comparison method may return the singleton "NotImplemented"
if it does not implement the operation for a given pair of
arguments. By convention, "False" and "True" are returned for a
successful comparison. However, these methods can return any value,
so if the comparison operator is used in a Boolean context (e.g.,
in the condition of an "if" statement), Python will call "bool()"
on the value to determine if the result is true or false.
By default, "object" implements "__eq__()" by using "is", returning
"NotImplemented" in the case of a false comparison: "True if x is y
else NotImplemented". For "__ne__()", by default it delegates to
"__eq__()" and inverts the result unless it is "NotImplemented".
There are no other implied relationships among the comparison
operators or default implementations; for example, the truth of
"(x<y or x==y)" does not imply "x<=y". To automatically generate
ordering operations from a single root operation, see
"functools.total_ordering()".
See the paragraph on "__hash__()" for some important notes on
creating *hashable* objects which support custom comparison
operations and are usable as dictionary keys.
There are no swapped-argument versions of these methods (to be used
when the left argument does not support the operation but the right
argument does); rather, "__lt__()" and "__gt__()" are each other’s
reflection, "__le__()" and "__ge__()" are each other’s reflection,
and "__eq__()" and "__ne__()" are their own reflection. If the
operands are of different types, and right operand’s type is a
direct or indirect subclass of the left operand’s type, the
reflected method of the right operand has priority, otherwise the
left operand’s method has priority. Virtual subclassing is not
considered.
object.__hash__(self)
Called by built-in function "hash()" and for operations on members
of hashed collections including "set", "frozenset", and "dict".
"__hash__()" should return an integer. The only required property
is that objects which compare equal have the same hash value; it is
advised to mix together the hash values of the components of the
object that also play a part in comparison of objects by packing
them into a tuple and hashing the tuple. Example:
def __hash__(self):
return hash((self.name, self.nick, self.color))
Note:
"hash()" truncates the value returned from an object’s custom
"__hash__()" method to the size of a "Py_ssize_t". This is
typically 8 bytes on 64-bit builds and 4 bytes on 32-bit builds.
If an object’s "__hash__()" must interoperate on builds of
different bit sizes, be sure to check the width on all supported
builds. An easy way to do this is with "python -c "import sys;
print(sys.hash_info.width)"".
If a class does not define an "__eq__()" method it should not
define a "__hash__()" operation either; if it defines "__eq__()"
but not "__hash__()", its instances will not be usable as items in
hashable collections. If a class defines mutable objects and
implements an "__eq__()" method, it should not implement
"__hash__()", since the implementation of hashable collections
requires that a key’s hash value is immutable (if the object’s hash
value changes, it will be in the wrong hash bucket).
User-defined classes have "__eq__()" and "__hash__()" methods by
default; with them, all objects compare unequal (except with
themselves) and "x.__hash__()" returns an appropriate value such
that "x == y" implies both that "x is y" and "hash(x) == hash(y)".
A class that overrides "__eq__()" and does not define "__hash__()"
will have its "__hash__()" implicitly set to "None". When the
"__hash__()" method of a class is "None", instances of the class
will raise an appropriate "TypeError" when a program attempts to
retrieve their hash value, and will also be correctly identified as
unhashable when checking "isinstance(obj,
collections.abc.Hashable)".
If a class that overrides "__eq__()" needs to retain the
implementation of "__hash__()" from a parent class, the interpreter
must be told this explicitly by setting "__hash__ =
<ParentClass>.__hash__".
If a class that does not override "__eq__()" wishes to suppress
hash support, it should include "__hash__ = None" in the class
definition. A class which defines its own "__hash__()" that
explicitly raises a "TypeError" would be incorrectly identified as
hashable by an "isinstance(obj, collections.abc.Hashable)" call.
Note:
By default, the "__hash__()" values of str and bytes objects are
“salted” with an unpredictable random value. Although they
remain constant within an individual Python process, they are not
predictable between repeated invocations of Python.This is
intended to provide protection against a denial-of-service caused
by carefully-chosen inputs that exploit the worst case
performance of a dict insertion, O(n^2) complexity. See
http://www.ocert.org/advisories/ocert-2011-003.html for
details.Changing hash values affects the iteration order of sets.
Python has never made guarantees about this ordering (and it
typically varies between 32-bit and 64-bit builds).See also
"PYTHONHASHSEED".
Changed in version 3.3: Hash randomization is enabled by default.
object.__bool__(self)
Called to implement truth value testing and the built-in operation
"bool()"; should return "False" or "True". When this method is not
defined, "__len__()" is called, if it is defined, and the object is
considered true if its result is nonzero. If a class defines
neither "__len__()" nor "__bool__()", all its instances are
considered true.
Customizing attribute access
============================
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of "x.name") for
class instances.
object.__getattr__(self, name)
Called when the default attribute access fails with an
"AttributeError" (either "__getattribute__()" raises an
"AttributeError" because *name* is not an instance attribute or an
attribute in the class tree for "self"; or "__get__()" of a *name*
property raises "AttributeError"). This method should either
return the (computed) attribute value or raise an "AttributeError"
exception.
Note that if the attribute is found through the normal mechanism,
"__getattr__()" is not called. (This is an intentional asymmetry
between "__getattr__()" and "__setattr__()".) This is done both for
efficiency reasons and because otherwise "__getattr__()" would have
no way to access other attributes of the instance. Note that at
least for instance variables, you can fake total control by not
inserting any values in the instance attribute dictionary (but
instead inserting them in another object). See the
"__getattribute__()" method below for a way to actually get total
control over attribute access.
object.__getattribute__(self, name)
Called unconditionally to implement attribute accesses for
instances of the class. If the class also defines "__getattr__()",
the latter will not be called unless "__getattribute__()" either
calls it explicitly or raises an "AttributeError". This method
should return the (computed) attribute value or raise an
"AttributeError" exception. In order to avoid infinite recursion in
this method, its implementation should always call the base class
method with the same name to access any attributes it needs, for
example, "object.__getattribute__(self, name)".
Note:
This method may still be bypassed when looking up special methods
as the result of implicit invocation via language syntax or
built-in functions. See Special method lookup.
For certain sensitive attribute accesses, raises an auditing event
"object.__getattr__" with arguments "obj" and "name".
object.__setattr__(self, name, value)
Called when an attribute assignment is attempted. This is called
instead of the normal mechanism (i.e. store the value in the
instance dictionary). *name* is the attribute name, *value* is the
value to be assigned to it.
If "__setattr__()" wants to assign to an instance attribute, it
should call the base class method with the same name, for example,
"object.__setattr__(self, name, value)".
For certain sensitive attribute assignments, raises an auditing
event "object.__setattr__" with arguments "obj", "name", "value".
object.__delattr__(self, name)
Like "__setattr__()" but for attribute deletion instead of
assignment. This should only be implemented if "del obj.name" is
meaningful for the object.
For certain sensitive attribute deletions, raises an auditing event
"object.__delattr__" with arguments "obj" and "name".
object.__dir__(self)
Called when "dir()" is called on the object. A sequence must be
returned. "dir()" converts the returned sequence to a list and
sorts it.
Customizing module attribute access
-----------------------------------
Special names "__getattr__" and "__dir__" can be also used to
customize access to module attributes. The "__getattr__" function at
the module level should accept one argument which is the name of an
attribute and return the computed value or raise an "AttributeError".
If an attribute is not found on a module object through the normal
lookup, i.e. "object.__getattribute__()", then "__getattr__" is
searched in the module "__dict__" before raising an "AttributeError".
If found, it is called with the attribute name and the result is
returned.
The "__dir__" function should accept no arguments, and return a
sequence of strings that represents the names accessible on module. If
present, this function overrides the standard "dir()" search on a
module.
For a more fine grained customization of the module behavior (setting
attributes, properties, etc.), one can set the "__class__" attribute
of a module object to a subclass of "types.ModuleType". For example:
import sys
from types import ModuleType
class VerboseModule(ModuleType):
def __repr__(self):
return f'Verbose {self.__name__}'
def __setattr__(self, attr, value):
print(f'Setting {attr}...')
super().__setattr__(attr, value)
sys.modules[__name__].__class__ = VerboseModule
Note:
Defining module "__getattr__" and setting module "__class__" only
affect lookups made using the attribute access syntax – directly
accessing the module globals (whether by code within the module, or
via a reference to the module’s globals dictionary) is unaffected.
Changed in version 3.5: "__class__" module attribute is now writable.
New in version 3.7: "__getattr__" and "__dir__" module attributes.
See also:
**PEP 562** - Module __getattr__ and __dir__
Describes the "__getattr__" and "__dir__" functions on modules.
Implementing Descriptors
------------------------
The following methods only apply when an instance of the class
containing the method (a so-called *descriptor* class) appears in an
*owner* class (the descriptor must be in either the owner’s class
dictionary or in the class dictionary for one of its parents). In the
examples below, “the attribute” refers to the attribute whose name is
the key of the property in the owner class’ "__dict__".
object.__get__(self, instance, owner=None)
Called to get the attribute of the owner class (class attribute
access) or of an instance of that class (instance attribute
access). The optional *owner* argument is the owner class, while
*instance* is the instance that the attribute was accessed through,
or "None" when the attribute is accessed through the *owner*.
This method should return the computed attribute value or raise an
"AttributeError" exception.
**PEP 252** specifies that "__get__()" is callable with one or two
arguments. Python’s own built-in descriptors support this
specification; however, it is likely that some third-party tools
have descriptors that require both arguments. Python’s own
"__getattribute__()" implementation always passes in both arguments
whether they are required or not.
object.__set__(self, instance, value)
Called to set the attribute on an instance *instance* of the owner
class to a new value, *value*.
Note, adding "__set__()" or "__delete__()" changes the kind of
descriptor to a “data descriptor”. See Invoking Descriptors for
more details.
object.__delete__(self, instance)
Called to delete the attribute on an instance *instance* of the
owner class.
object.__set_name__(self, owner, name)
Called at the time the owning class *owner* is created. The
descriptor has been assigned to *name*.
Note:
"__set_name__()" is only called implicitly as part of the "type"
constructor, so it will need to be called explicitly with the
appropriate parameters when a descriptor is added to a class
after initial creation:
class A:
pass
descr = custom_descriptor()
A.attr = descr
descr.__set_name__(A, 'attr')
See Creating the class object for more details.
New in version 3.6.
The attribute "__objclass__" is interpreted by the "inspect" module as
specifying the class where this object was defined (setting this
appropriately can assist in runtime introspection of dynamic class
attributes). For callables, it may indicate that an instance of the
given type (or a subclass) is expected or required as the first
positional argument (for example, CPython sets this attribute for
unbound methods that are implemented in C).
Invoking Descriptors
--------------------
In general, a descriptor is an object attribute with “binding
behavior”, one whose attribute access has been overridden by methods
in the descriptor protocol: "__get__()", "__set__()", and
"__delete__()". If any of those methods are defined for an object, it
is said to be a descriptor.
The default behavior for attribute access is to get, set, or delete
the attribute from an object’s dictionary. For instance, "a.x" has a
lookup chain starting with "a.__dict__['x']", then
"type(a).__dict__['x']", and continuing through the base classes of
"type(a)" excluding metaclasses.
However, if the looked-up value is an object defining one of the
descriptor methods, then Python may override the default behavior and
invoke the descriptor method instead. Where this occurs in the
precedence chain depends on which descriptor methods were defined and
how they were called.
The starting point for descriptor invocation is a binding, "a.x". How
the arguments are assembled depends on "a":
Direct Call
The simplest and least common call is when user code directly
invokes a descriptor method: "x.__get__(a)".
Instance Binding
If binding to an object instance, "a.x" is transformed into the
call: "type(a).__dict__['x'].__get__(a, type(a))".
Class Binding
If binding to a class, "A.x" is transformed into the call:
"A.__dict__['x'].__get__(None, A)".
Super Binding
If "a" is an instance of "super", then the binding "super(B,
obj).m()" searches "obj.__class__.__mro__" for the base class "A"
immediately preceding "B" and then invokes the descriptor with the
call: "A.__dict__['m'].__get__(obj, obj.__class__)".
For instance bindings, the precedence of descriptor invocation depends
on which descriptor methods are defined. A descriptor can define any
combination of "__get__()", "__set__()" and "__delete__()". If it
does not define "__get__()", then accessing the attribute will return
the descriptor object itself unless there is a value in the object’s
instance dictionary. If the descriptor defines "__set__()" and/or
"__delete__()", it is a data descriptor; if it defines neither, it is
a non-data descriptor. Normally, data descriptors define both
"__get__()" and "__set__()", while non-data descriptors have just the
"__get__()" method. Data descriptors with "__set__()" and "__get__()"
defined always override a redefinition in an instance dictionary. In
contrast, non-data descriptors can be overridden by instances.
Python methods (including "staticmethod()" and "classmethod()") are
implemented as non-data descriptors. Accordingly, instances can
redefine and override methods. This allows individual instances to
acquire behaviors that differ from other instances of the same class.
The "property()" function is implemented as a data descriptor.
Accordingly, instances cannot override the behavior of a property.
__slots__
---------
*__slots__* allow us to explicitly declare data members (like
properties) and deny the creation of *__dict__* and *__weakref__*
(unless explicitly declared in *__slots__* or available in a parent.)
The space saved over using *__dict__* can be significant. Attribute
lookup speed can be significantly improved as well.
object.__slots__
This class variable can be assigned a string, iterable, or sequence
of strings with variable names used by instances. *__slots__*
reserves space for the declared variables and prevents the
automatic creation of *__dict__* and *__weakref__* for each
instance.
Notes on using *__slots__*
~~~~~~~~~~~~~~~~~~~~~~~~~~
* When inheriting from a class without *__slots__*, the *__dict__* and
*__weakref__* attribute of the instances will always be accessible.
* Without a *__dict__* variable, instances cannot be assigned new
variables not listed in the *__slots__* definition. Attempts to
assign to an unlisted variable name raises "AttributeError". If
dynamic assignment of new variables is desired, then add
"'__dict__'" to the sequence of strings in the *__slots__*
declaration.
* Without a *__weakref__* variable for each instance, classes defining
*__slots__* do not support weak references to its instances. If weak
reference support is needed, then add "'__weakref__'" to the
sequence of strings in the *__slots__* declaration.
* *__slots__* are implemented at the class level by creating
descriptors (Implementing Descriptors) for each variable name. As a
result, class attributes cannot be used to set default values for
instance variables defined by *__slots__*; otherwise, the class
attribute would overwrite the descriptor assignment.
* The action of a *__slots__* declaration is not limited to the class
where it is defined. *__slots__* declared in parents are available
in child classes. However, child subclasses will get a *__dict__*
and *__weakref__* unless they also define *__slots__* (which should
only contain names of any *additional* slots).
* If a class defines a slot also defined in a base class, the instance
variable defined by the base class slot is inaccessible (except by
retrieving its descriptor directly from the base class). This
renders the meaning of the program undefined. In the future, a
check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from
“variable-length” built-in types such as "int", "bytes" and "tuple".
* Any non-string iterable may be assigned to *__slots__*. Mappings may
also be used; however, in the future, special meaning may be
assigned to the values corresponding to each key.
* *__class__* assignment works only if both classes have the same
*__slots__*.
* Multiple inheritance with multiple slotted parent classes can be
used, but only one parent is allowed to have attributes created by
slots (the other bases must have empty slot layouts) - violations
raise "TypeError".
* If an iterator is used for *__slots__* then a descriptor is created
for each of the iterator’s values. However, the *__slots__*
attribute will be an empty iterator.
Customizing class creation
==========================
Whenever a class inherits from another class, *__init_subclass__* is
called on that class. This way, it is possible to write classes which
change the behavior of subclasses. This is closely related to class
decorators, but where class decorators only affect the specific class
they’re applied to, "__init_subclass__" solely applies to future
subclasses of the class defining the method.
classmethod object.__init_subclass__(cls)
This method is called whenever the containing class is subclassed.
*cls* is then the new subclass. If defined as a normal instance
method, this method is implicitly converted to a class method.
Keyword arguments which are given to a new class are passed to the
parent’s class "__init_subclass__". For compatibility with other
classes using "__init_subclass__", one should take out the needed
keyword arguments and pass the others over to the base class, as
in:
class Philosopher:
def __init_subclass__(cls, /, default_name, **kwargs):
super().__init_subclass__(**kwargs)
cls.default_name = default_name
class AustralianPhilosopher(Philosopher, default_name="Bruce"):
pass
The default implementation "object.__init_subclass__" does nothing,
but raises an error if it is called with any arguments.
Note:
The metaclass hint "metaclass" is consumed by the rest of the
type machinery, and is never passed to "__init_subclass__"
implementations. The actual metaclass (rather than the explicit
hint) can be accessed as "type(cls)".
New in version 3.6.
Metaclasses
-----------
By default, classes are constructed using "type()". The class body is
executed in a new namespace and the class name is bound locally to the
result of "type(name, bases, namespace)".
The class creation process can be customized by passing the
"metaclass" keyword argument in the class definition line, or by
inheriting from an existing class that included such an argument. In
the following example, both "MyClass" and "MySubclass" are instances
of "Meta":
class Meta(type):
pass
class MyClass(metaclass=Meta):
pass
class MySubclass(MyClass):
pass
Any other keyword arguments that are specified in the class definition
are passed through to all metaclass operations described below.
When a class definition is executed, the following steps occur:
* MRO entries are resolved;
* the appropriate metaclass is determined;
* the class namespace is prepared;
* the class body is executed;
* the class object is created.
Resolving MRO entries
---------------------
If a base that appears in class definition is not an instance of
"type", then an "__mro_entries__" method is searched on it. If found,
it is called with the original bases tuple. This method must return a
tuple of classes that will be used instead of this base. The tuple may
be empty, in such case the original base is ignored.
See also:
**PEP 560** - Core support for typing module and generic types
Determining the appropriate metaclass
-------------------------------------
The appropriate metaclass for a class definition is determined as
follows:
* if no bases and no explicit metaclass are given, then "type()" is
used;
* if an explicit metaclass is given and it is *not* an instance of
"type()", then it is used directly as the metaclass;
* if an instance of "type()" is given as the explicit metaclass, or
bases are defined, then the most derived metaclass is used.
The most derived metaclass is selected from the explicitly specified
metaclass (if any) and the metaclasses (i.e. "type(cls)") of all
specified base classes. The most derived metaclass is one which is a
subtype of *all* of these candidate metaclasses. If none of the
candidate metaclasses meets that criterion, then the class definition
will fail with "TypeError".
Preparing the class namespace
-----------------------------
Once the appropriate metaclass has been identified, then the class
namespace is prepared. If the metaclass has a "__prepare__" attribute,
it is called as "namespace = metaclass.__prepare__(name, bases,
**kwds)" (where the additional keyword arguments, if any, come from
the class definition). The "__prepare__" method should be implemented
as a "classmethod()". The namespace returned by "__prepare__" is
passed in to "__new__", but when the final class object is created the
namespace is copied into a new "dict".
If the metaclass has no "__prepare__" attribute, then the class
namespace is initialised as an empty ordered mapping.
See also:
**PEP 3115** - Metaclasses in Python 3000
Introduced the "__prepare__" namespace hook
Executing the class body
------------------------
The class body is executed (approximately) as "exec(body, globals(),
namespace)". The key difference from a normal call to "exec()" is that
lexical scoping allows the class body (including any methods) to
reference names from the current and outer scopes when the class
definition occurs inside a function.
However, even when the class definition occurs inside the function,
methods defined inside the class still cannot see names defined at the
class scope. Class variables must be accessed through the first
parameter of instance or class methods, or through the implicit
lexically scoped "__class__" reference described in the next section.
Creating the class object
-------------------------
Once the class namespace has been populated by executing the class
body, the class object is created by calling "metaclass(name, bases,
namespace, **kwds)" (the additional keywords passed here are the same
as those passed to "__prepare__").
This class object is the one that will be referenced by the zero-
argument form of "super()". "__class__" is an implicit closure
reference created by the compiler if any methods in a class body refer
to either "__class__" or "super". This allows the zero argument form
of "super()" to correctly identify the class being defined based on
lexical scoping, while the class or instance that was used to make the
current call is identified based on the first argument passed to the
method.
**CPython implementation detail:** In CPython 3.6 and later, the
"__class__" cell is passed to the metaclass as a "__classcell__" entry
in the class namespace. If present, this must be propagated up to the
"type.__new__" call in order for the class to be initialised
correctly. Failing to do so will result in a "RuntimeError" in Python
3.8.
When using the default metaclass "type", or any metaclass that
ultimately calls "type.__new__", the following additional
customisation steps are invoked after creating the class object:
* first, "type.__new__" collects all of the descriptors in the class
namespace that define a "__set_name__()" method;
* second, all of these "__set_name__" methods are called with the
class being defined and the assigned name of that particular
descriptor;
* finally, the "__init_subclass__()" hook is called on the immediate
parent of the new class in its method resolution order.
After the class object is created, it is passed to the class
decorators included in the class definition (if any) and the resulting
object is bound in the local namespace as the defined class.
When a new class is created by "type.__new__", the object provided as
the namespace parameter is copied to a new ordered mapping and the
original object is discarded. The new copy is wrapped in a read-only
proxy, which becomes the "__dict__" attribute of the class object.
See also:
**PEP 3135** - New super
Describes the implicit "__class__" closure reference
Uses for metaclasses
--------------------
The potential uses for metaclasses are boundless. Some ideas that have
been explored include enum, logging, interface checking, automatic
delegation, automatic property creation, proxies, frameworks, and
automatic resource locking/synchronization.
Customizing instance and subclass checks
========================================
The following methods are used to override the default behavior of the
"isinstance()" and "issubclass()" built-in functions.
In particular, the metaclass "abc.ABCMeta" implements these methods in
order to allow the addition of Abstract Base Classes (ABCs) as
“virtual base classes” to any class or type (including built-in
types), including other ABCs.
class.__instancecheck__(self, instance)
Return true if *instance* should be considered a (direct or
indirect) instance of *class*. If defined, called to implement
"isinstance(instance, class)".
class.__subclasscheck__(self, subclass)
Return true if *subclass* should be considered a (direct or
indirect) subclass of *class*. If defined, called to implement
"issubclass(subclass, class)".
Note that these methods are looked up on the type (metaclass) of a
class. They cannot be defined as class methods in the actual class.
This is consistent with the lookup of special methods that are called
on instances, only in this case the instance is itself a class.
See also:
**PEP 3119** - Introducing Abstract Base Classes
Includes the specification for customizing "isinstance()" and
"issubclass()" behavior through "__instancecheck__()" and
"__subclasscheck__()", with motivation for this functionality in
the context of adding Abstract Base Classes (see the "abc"
module) to the language.
Emulating generic types
=======================
One can implement the generic class syntax as specified by **PEP 484**
(for example "List[int]") by defining a special method:
classmethod object.__class_getitem__(cls, key)
Return an object representing the specialization of a generic class
by type arguments found in *key*.
This method is looked up on the class object itself, and when defined
in the class body, this method is implicitly a class method. Note,
this mechanism is primarily reserved for use with static type hints,
other usage is discouraged.
See also:
**PEP 560** - Core support for typing module and generic types
Emulating callable objects
==========================
object.__call__(self[, args...])
Called when the instance is “called” as a function; if this method
is defined, "x(arg1, arg2, ...)" roughly translates to
"type(x).__call__(x, arg1, ...)".
Emulating container types
=========================
The following methods can be defined to implement container objects.
Containers usually are sequences (such as lists or tuples) or mappings
(like dictionaries), but can represent other containers as well. The
first set of methods is used either to emulate a sequence or to
emulate a mapping; the difference is that for a sequence, the
allowable keys should be the integers *k* for which "0 <= k < N" where
*N* is the length of the sequence, or slice objects, which define a
range of items. It is also recommended that mappings provide the
methods "keys()", "values()", "items()", "get()", "clear()",
"setdefault()", "pop()", "popitem()", "copy()", and "update()"
behaving similar to those for Python’s standard dictionary objects.
The "collections.abc" module provides a "MutableMapping" abstract base
class to help create those methods from a base set of "__getitem__()",
"__setitem__()", "__delitem__()", and "keys()". Mutable sequences
should provide methods "append()", "count()", "index()", "extend()",
"insert()", "pop()", "remove()", "reverse()" and "sort()", like Python
standard list objects. Finally, sequence types should implement
addition (meaning concatenation) and multiplication (meaning
repetition) by defining the methods "__add__()", "__radd__()",
"__iadd__()", "__mul__()", "__rmul__()" and "__imul__()" described
below; they should not define other numerical operators. It is
recommended that both mappings and sequences implement the
"__contains__()" method to allow efficient use of the "in" operator;
for mappings, "in" should search the mapping’s keys; for sequences, it
should search through the values. It is further recommended that both
mappings and sequences implement the "__iter__()" method to allow
efficient iteration through the container; for mappings, "__iter__()"
should iterate through the object’s keys; for sequences, it should
iterate through the values.
object.__len__(self)
Called to implement the built-in function "len()". Should return
the length of the object, an integer ">=" 0. Also, an object that
doesn’t define a "__bool__()" method and whose "__len__()" method
returns zero is considered to be false in a Boolean context.
**CPython implementation detail:** In CPython, the length is
required to be at most "sys.maxsize". If the length is larger than
"sys.maxsize" some features (such as "len()") may raise
"OverflowError". To prevent raising "OverflowError" by truth value
testing, an object must define a "__bool__()" method.
object.__length_hint__(self)
Called to implement "operator.length_hint()". Should return an
estimated length for the object (which may be greater or less than
the actual length). The length must be an integer ">=" 0. The
return value may also be "NotImplemented", which is treated the
same as if the "__length_hint__" method didn’t exist at all. This
method is purely an optimization and is never required for
correctness.
New in version 3.4.
Note:
Slicing is done exclusively with the following three methods. A
call like
a[1:2] = b
is translated to
a[slice(1, 2, None)] = b
and so forth. Missing slice items are always filled in with "None".
object.__getitem__(self, key)
Called to implement evaluation of "self[key]". For sequence types,
the accepted keys should be integers and slice objects. Note that
the special interpretation of negative indexes (if the class wishes
to emulate a sequence type) is up to the "__getitem__()" method. If
*key* is of an inappropriate type, "TypeError" may be raised; if of
a value outside the set of indexes for the sequence (after any
special interpretation of negative values), "IndexError" should be
raised. For mapping types, if *key* is missing (not in the
container), "KeyError" should be raised.
Note:
"for" loops expect that an "IndexError" will be raised for
illegal indexes to allow proper detection of the end of the
sequence.
object.__setitem__(self, key, value)
Called to implement assignment to "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support changes to the values for keys, or if new keys
can be added, or for sequences if elements can be replaced. The
same exceptions should be raised for improper *key* values as for
the "__getitem__()" method.
object.__delitem__(self, key)
Called to implement deletion of "self[key]". Same note as for
"__getitem__()". This should only be implemented for mappings if
the objects support removal of keys, or for sequences if elements
can be removed from the sequence. The same exceptions should be
raised for improper *key* values as for the "__getitem__()" method.
object.__missing__(self, key)
Called by "dict"."__getitem__()" to implement "self[key]" for dict
subclasses when key is not in the dictionary.
object.__iter__(self)
This method is called when an iterator is required for a container.
This method should return a new iterator object that can iterate
over all the objects in the container. For mappings, it should
iterate over the keys of the container.
Iterator objects also need to implement this method; they are
required to return themselves. For more information on iterator
objects, see Iterator Types.
object.__reversed__(self)
Called (if present) by the "reversed()" built-in to implement
reverse iteration. It should return a new iterator object that
iterates over all the objects in the container in reverse order.
If the "__reversed__()" method is not provided, the "reversed()"
built-in will fall back to using the sequence protocol ("__len__()"
and "__getitem__()"). Objects that support the sequence protocol
should only provide "__reversed__()" if they can provide an
implementation that is more efficient than the one provided by
"reversed()".
The membership test operators ("in" and "not in") are normally
implemented as an iteration through a container. However, container
objects can supply the following special method with a more efficient
implementation, which also does not require the object be iterable.
object.__contains__(self, item)
Called to implement membership test operators. Should return true
if *item* is in *self*, false otherwise. For mapping objects, this
should consider the keys of the mapping rather than the values or
the key-item pairs.
For objects that don’t define "__contains__()", the membership test
first tries iteration via "__iter__()", then the old sequence
iteration protocol via "__getitem__()", see this section in the
language reference.
Emulating numeric types
=======================
The following methods can be defined to emulate numeric objects.
Methods corresponding to operations that are not supported by the
particular kind of number implemented (e.g., bitwise operations for
non-integral numbers) should be left undefined.
object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__matmul__(self, other)
object.__truediv__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|"). For instance, to
evaluate the expression "x + y", where *x* is an instance of a
class that has an "__add__()" method, "x.__add__(y)" is called.
The "__divmod__()" method should be the equivalent to using
"__floordiv__()" and "__mod__()"; it should not be related to
"__truediv__()". Note that "__pow__()" should be defined to accept
an optional third argument if the ternary version of the built-in
"pow()" function is to be supported.
If one of those methods does not support the operation with the
supplied arguments, it should return "NotImplemented".
object.__radd__(self, other)
object.__rsub__(self, other)
object.__rmul__(self, other)
object.__rmatmul__(self, other)
object.__rtruediv__(self, other)
object.__rfloordiv__(self, other)
object.__rmod__(self, other)
object.__rdivmod__(self, other)
object.__rpow__(self, other[, modulo])
object.__rlshift__(self, other)
object.__rrshift__(self, other)
object.__rand__(self, other)
object.__rxor__(self, other)
object.__ror__(self, other)
These methods are called to implement the binary arithmetic
operations ("+", "-", "*", "@", "/", "//", "%", "divmod()",
"pow()", "**", "<<", ">>", "&", "^", "|") with reflected (swapped)
operands. These functions are only called if the left operand does
not support the corresponding operation [3] and the operands are of
different types. [4] For instance, to evaluate the expression "x -
y", where *y* is an instance of a class that has an "__rsub__()"
method, "y.__rsub__(x)" is called if "x.__sub__(y)" returns
*NotImplemented*.
Note that ternary "pow()" will not try calling "__rpow__()" (the
coercion rules would become too complicated).
Note:
If the right operand’s type is a subclass of the left operand’s
type and that subclass provides a different implementation of the
reflected method for the operation, this method will be called
before the left operand’s non-reflected method. This behavior
allows subclasses to override their ancestors’ operations.
object.__iadd__(self, other)
object.__isub__(self, other)
object.__imul__(self, other)
object.__imatmul__(self, other)
object.__itruediv__(self, other)
object.__ifloordiv__(self, other)
object.__imod__(self, other)
object.__ipow__(self, other[, modulo])
object.__ilshift__(self, other)
object.__irshift__(self, other)
object.__iand__(self, other)
object.__ixor__(self, other)
object.__ior__(self, other)
These methods are called to implement the augmented arithmetic
assignments ("+=", "-=", "*=", "@=", "/=", "//=", "%=", "**=",
"<<=", ">>=", "&=", "^=", "|="). These methods should attempt to
do the operation in-place (modifying *self*) and return the result
(which could be, but does not have to be, *self*). If a specific
method is not defined, the augmented assignment falls back to the
normal methods. For instance, if *x* is an instance of a class
with an "__iadd__()" method, "x += y" is equivalent to "x =
x.__iadd__(y)" . Otherwise, "x.__add__(y)" and "y.__radd__(x)" are
considered, as with the evaluation of "x + y". In certain
situations, augmented assignment can result in unexpected errors
(see Why does a_tuple[i] += [‘item’] raise an exception when the
addition works?), but this behavior is in fact part of the data
model.
Note:
Due to a bug in the dispatching mechanism for "**=", a class that
defines "__ipow__()" but returns "NotImplemented" would fail to
fall back to "x.__pow__(y)" and "y.__rpow__(x)". This bug is
fixed in Python 3.10.
object.__neg__(self)
object.__pos__(self)
object.__abs__(self)
object.__invert__(self)
Called to implement the unary arithmetic operations ("-", "+",
"abs()" and "~").
object.__complex__(self)
object.__int__(self)
object.__float__(self)
Called to implement the built-in functions "complex()", "int()" and
"float()". Should return a value of the appropriate type.
object.__index__(self)
Called to implement "operator.index()", and whenever Python needs
to losslessly convert the numeric object to an integer object (such
as in slicing, or in the built-in "bin()", "hex()" and "oct()"
functions). Presence of this method indicates that the numeric
object is an integer type. Must return an integer.
If "__int__()", "__float__()" and "__complex__()" are not defined
then corresponding built-in functions "int()", "float()" and
"complex()" fall back to "__index__()".
object.__round__(self[, ndigits])
object.__trunc__(self)
object.__floor__(self)
object.__ceil__(self)
Called to implement the built-in function "round()" and "math"
functions "trunc()", "floor()" and "ceil()". Unless *ndigits* is
passed to "__round__()" all these methods should return the value
of the object truncated to an "Integral" (typically an "int").
The built-in function "int()" falls back to "__trunc__()" if
neither "__int__()" nor "__index__()" is defined.
With Statement Context Managers
===============================
A *context manager* is an object that defines the runtime context to
be established when executing a "with" statement. The context manager
handles the entry into, and the exit from, the desired runtime context
for the execution of the block of code. Context managers are normally
invoked using the "with" statement (described in section The with
statement), but can also be used by directly invoking their methods.
Typical uses of context managers include saving and restoring various
kinds of global state, locking and unlocking resources, closing opened
files, etc.
For more information on context managers, see Context Manager Types.
object.__enter__(self)
Enter the runtime context related to this object. The "with"
statement will bind this method’s return value to the target(s)
specified in the "as" clause of the statement, if any.
object.__exit__(self, exc_type, exc_value, traceback)
Exit the runtime context related to this object. The parameters
describe the exception that caused the context to be exited. If the
context was exited without an exception, all three arguments will
be "None".
If an exception is supplied, and the method wishes to suppress the
exception (i.e., prevent it from being propagated), it should
return a true value. Otherwise, the exception will be processed
normally upon exit from this method.
Note that "__exit__()" methods should not reraise the passed-in
exception; this is the caller’s responsibility.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
Special method lookup
=====================
For custom classes, implicit invocations of special methods are only
guaranteed to work correctly if defined on an object’s type, not in
the object’s instance dictionary. That behaviour is the reason why
the following code raises an exception:
>>> class C:
... pass
...
>>> c = C()
>>> c.__len__ = lambda: 5
>>> len(c)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: object of type 'C' has no len()
The rationale behind this behaviour lies with a number of special
methods such as "__hash__()" and "__repr__()" that are implemented by
all objects, including type objects. If the implicit lookup of these
methods used the conventional lookup process, they would fail when
invoked on the type object itself:
>>> 1 .__hash__() == hash(1)
True
>>> int.__hash__() == hash(int)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: descriptor '__hash__' of 'int' object needs an argument
Incorrectly attempting to invoke an unbound method of a class in this
way is sometimes referred to as ‘metaclass confusion’, and is avoided
by bypassing the instance when looking up special methods:
>>> type(1).__hash__(1) == hash(1)
True
>>> type(int).__hash__(int) == hash(int)
True
In addition to bypassing any instance attributes in the interest of
correctness, implicit special method lookup generally also bypasses
the "__getattribute__()" method even of the object’s metaclass:
>>> class Meta(type):
... def __getattribute__(*args):
... print("Metaclass getattribute invoked")
... return type.__getattribute__(*args)
...
>>> class C(object, metaclass=Meta):
... def __len__(self):
... return 10
... def __getattribute__(*args):
... print("Class getattribute invoked")
... return object.__getattribute__(*args)
...
>>> c = C()
>>> c.__len__() # Explicit lookup via instance
Class getattribute invoked
10
>>> type(c).__len__(c) # Explicit lookup via type
Metaclass getattribute invoked
10
>>> len(c) # Implicit lookup
10
Bypassing the "__getattribute__()" machinery in this fashion provides
significant scope for speed optimisations within the interpreter, at
the cost of some flexibility in the handling of special methods (the
special method *must* be set on the class object itself in order to be
consistently invoked by the interpreter).
u�Y String Methods
**************
Strings implement all of the common sequence operations, along with
the additional methods described below.
Strings also support two styles of string formatting, one providing a
large degree of flexibility and customization (see "str.format()",
Format String Syntax and Custom String Formatting) and the other based
on C "printf" style formatting that handles a narrower range of types
and is slightly harder to use correctly, but is often faster for the
cases it can handle (printf-style String Formatting).
The Text Processing Services section of the standard library covers a
number of other modules that provide various text related utilities
(including regular expression support in the "re" module).
str.capitalize()
Return a copy of the string with its first character capitalized
and the rest lowercased.
Changed in version 3.8: The first character is now put into
titlecase rather than uppercase. This means that characters like
digraphs will only have their first letter capitalized, instead of
the full character.
str.casefold()
Return a casefolded copy of the string. Casefolded strings may be
used for caseless matching.
Casefolding is similar to lowercasing but more aggressive because
it is intended to remove all case distinctions in a string. For
example, the German lowercase letter "'ß'" is equivalent to ""ss"".
Since it is already lowercase, "lower()" would do nothing to "'ß'";
"casefold()" converts it to ""ss"".
The casefolding algorithm is described in section 3.13 of the
Unicode Standard.
New in version 3.3.
str.center(width[, fillchar])
Return centered in a string of length *width*. Padding is done
using the specified *fillchar* (default is an ASCII space). The
original string is returned if *width* is less than or equal to
"len(s)".
str.count(sub[, start[, end]])
Return the number of non-overlapping occurrences of substring *sub*
in the range [*start*, *end*]. Optional arguments *start* and
*end* are interpreted as in slice notation.
str.encode(encoding="utf-8", errors="strict")
Return an encoded version of the string as a bytes object. Default
encoding is "'utf-8'". *errors* may be given to set a different
error handling scheme. The default for *errors* is "'strict'",
meaning that encoding errors raise a "UnicodeError". Other possible
values are "'ignore'", "'replace'", "'xmlcharrefreplace'",
"'backslashreplace'" and any other name registered via
"codecs.register_error()", see section Error Handlers. For a list
of possible encodings, see section Standard Encodings.
Changed in version 3.1: Support for keyword arguments added.
str.endswith(suffix[, start[, end]])
Return "True" if the string ends with the specified *suffix*,
otherwise return "False". *suffix* can also be a tuple of suffixes
to look for. With optional *start*, test beginning at that
position. With optional *end*, stop comparing at that position.
str.expandtabs(tabsize=8)
Return a copy of the string where all tab characters are replaced
by one or more spaces, depending on the current column and the
given tab size. Tab positions occur every *tabsize* characters
(default is 8, giving tab positions at columns 0, 8, 16 and so on).
To expand the string, the current column is set to zero and the
string is examined character by character. If the character is a
tab ("\t"), one or more space characters are inserted in the result
until the current column is equal to the next tab position. (The
tab character itself is not copied.) If the character is a newline
("\n") or return ("\r"), it is copied and the current column is
reset to zero. Any other character is copied unchanged and the
current column is incremented by one regardless of how the
character is represented when printed.
>>> '01\t012\t0123\t01234'.expandtabs()
'01 012 0123 01234'
>>> '01\t012\t0123\t01234'.expandtabs(4)
'01 012 0123 01234'
str.find(sub[, start[, end]])
Return the lowest index in the string where substring *sub* is
found within the slice "s[start:end]". Optional arguments *start*
and *end* are interpreted as in slice notation. Return "-1" if
*sub* is not found.
Note:
The "find()" method should be used only if you need to know the
position of *sub*. To check if *sub* is a substring or not, use
the "in" operator:
>>> 'Py' in 'Python'
True
str.format(*args, **kwargs)
Perform a string formatting operation. The string on which this
method is called can contain literal text or replacement fields
delimited by braces "{}". Each replacement field contains either
the numeric index of a positional argument, or the name of a
keyword argument. Returns a copy of the string where each
replacement field is replaced with the string value of the
corresponding argument.
>>> "The sum of 1 + 2 is {0}".format(1+2)
'The sum of 1 + 2 is 3'
See Format String Syntax for a description of the various
formatting options that can be specified in format strings.
Note:
When formatting a number ("int", "float", "complex",
"decimal.Decimal" and subclasses) with the "n" type (ex:
"'{:n}'.format(1234)"), the function temporarily sets the
"LC_CTYPE" locale to the "LC_NUMERIC" locale to decode
"decimal_point" and "thousands_sep" fields of "localeconv()" if
they are non-ASCII or longer than 1 byte, and the "LC_NUMERIC"
locale is different than the "LC_CTYPE" locale. This temporary
change affects other threads.
Changed in version 3.7: When formatting a number with the "n" type,
the function sets temporarily the "LC_CTYPE" locale to the
"LC_NUMERIC" locale in some cases.
str.format_map(mapping)
Similar to "str.format(**mapping)", except that "mapping" is used
directly and not copied to a "dict". This is useful if for example
"mapping" is a dict subclass:
>>> class Default(dict):
... def __missing__(self, key):
... return key
...
>>> '{name} was born in {country}'.format_map(Default(name='Guido'))
'Guido was born in country'
New in version 3.2.
str.index(sub[, start[, end]])
Like "find()", but raise "ValueError" when the substring is not
found.
str.isalnum()
Return "True" if all characters in the string are alphanumeric and
there is at least one character, "False" otherwise. A character
"c" is alphanumeric if one of the following returns "True":
"c.isalpha()", "c.isdecimal()", "c.isdigit()", or "c.isnumeric()".
str.isalpha()
Return "True" if all characters in the string are alphabetic and
there is at least one character, "False" otherwise. Alphabetic
characters are those characters defined in the Unicode character
database as “Letter”, i.e., those with general category property
being one of “Lm”, “Lt”, “Lu”, “Ll”, or “Lo”. Note that this is
different from the “Alphabetic” property defined in the Unicode
Standard.
str.isascii()
Return "True" if the string is empty or all characters in the
string are ASCII, "False" otherwise. ASCII characters have code
points in the range U+0000-U+007F.
New in version 3.7.
str.isdecimal()
Return "True" if all characters in the string are decimal
characters and there is at least one character, "False" otherwise.
Decimal characters are those that can be used to form numbers in
base 10, e.g. U+0660, ARABIC-INDIC DIGIT ZERO. Formally a decimal
character is a character in the Unicode General Category “Nd”.
str.isdigit()
Return "True" if all characters in the string are digits and there
is at least one character, "False" otherwise. Digits include
decimal characters and digits that need special handling, such as
the compatibility superscript digits. This covers digits which
cannot be used to form numbers in base 10, like the Kharosthi
numbers. Formally, a digit is a character that has the property
value Numeric_Type=Digit or Numeric_Type=Decimal.
str.isidentifier()
Return "True" if the string is a valid identifier according to the
language definition, section Identifiers and keywords.
Call "keyword.iskeyword()" to test whether string "s" is a reserved
identifier, such as "def" and "class".
Example:
>>> from keyword import iskeyword
>>> 'hello'.isidentifier(), iskeyword('hello')
True, False
>>> 'def'.isidentifier(), iskeyword('def')
True, True
str.islower()
Return "True" if all cased characters [4] in the string are
lowercase and there is at least one cased character, "False"
otherwise.
str.isnumeric()
Return "True" if all characters in the string are numeric
characters, and there is at least one character, "False" otherwise.
Numeric characters include digit characters, and all characters
that have the Unicode numeric value property, e.g. U+2155, VULGAR
FRACTION ONE FIFTH. Formally, numeric characters are those with
the property value Numeric_Type=Digit, Numeric_Type=Decimal or
Numeric_Type=Numeric.
str.isprintable()
Return "True" if all characters in the string are printable or the
string is empty, "False" otherwise. Nonprintable characters are
those characters defined in the Unicode character database as
“Other” or “Separator”, excepting the ASCII space (0x20) which is
considered printable. (Note that printable characters in this
context are those which should not be escaped when "repr()" is
invoked on a string. It has no bearing on the handling of strings
written to "sys.stdout" or "sys.stderr".)
str.isspace()
Return "True" if there are only whitespace characters in the string
and there is at least one character, "False" otherwise.
A character is *whitespace* if in the Unicode character database
(see "unicodedata"), either its general category is "Zs"
(“Separator, space”), or its bidirectional class is one of "WS",
"B", or "S".
str.istitle()
Return "True" if the string is a titlecased string and there is at
least one character, for example uppercase characters may only
follow uncased characters and lowercase characters only cased ones.
Return "False" otherwise.
str.isupper()
Return "True" if all cased characters [4] in the string are
uppercase and there is at least one cased character, "False"
otherwise.
str.join(iterable)
Return a string which is the concatenation of the strings in
*iterable*. A "TypeError" will be raised if there are any non-
string values in *iterable*, including "bytes" objects. The
separator between elements is the string providing this method.
str.ljust(width[, fillchar])
Return the string left justified in a string of length *width*.
Padding is done using the specified *fillchar* (default is an ASCII
space). The original string is returned if *width* is less than or
equal to "len(s)".
str.lower()
Return a copy of the string with all the cased characters [4]
converted to lowercase.
The lowercasing algorithm used is described in section 3.13 of the
Unicode Standard.
str.lstrip([chars])
Return a copy of the string with leading characters removed. The
*chars* argument is a string specifying the set of characters to be
removed. If omitted or "None", the *chars* argument defaults to
removing whitespace. The *chars* argument is not a prefix; rather,
all combinations of its values are stripped:
>>> ' spacious '.lstrip()
'spacious '
>>> 'www.example.com'.lstrip('cmowz.')
'example.com'
static str.maketrans(x[, y[, z]])
This static method returns a translation table usable for
"str.translate()".
If there is only one argument, it must be a dictionary mapping
Unicode ordinals (integers) or characters (strings of length 1) to
Unicode ordinals, strings (of arbitrary lengths) or "None".
Character keys will then be converted to ordinals.
If there are two arguments, they must be strings of equal length,
and in the resulting dictionary, each character in x will be mapped
to the character at the same position in y. If there is a third
argument, it must be a string, whose characters will be mapped to
"None" in the result.
str.partition(sep)
Split the string at the first occurrence of *sep*, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator. If the separator is not
found, return a 3-tuple containing the string itself, followed by
two empty strings.
str.replace(old, new[, count])
Return a copy of the string with all occurrences of substring *old*
replaced by *new*. If the optional argument *count* is given, only
the first *count* occurrences are replaced.
str.rfind(sub[, start[, end]])
Return the highest index in the string where substring *sub* is
found, such that *sub* is contained within "s[start:end]".
Optional arguments *start* and *end* are interpreted as in slice
notation. Return "-1" on failure.
str.rindex(sub[, start[, end]])
Like "rfind()" but raises "ValueError" when the substring *sub* is
not found.
str.rjust(width[, fillchar])
Return the string right justified in a string of length *width*.
Padding is done using the specified *fillchar* (default is an ASCII
space). The original string is returned if *width* is less than or
equal to "len(s)".
str.rpartition(sep)
Split the string at the last occurrence of *sep*, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator. If the separator is not
found, return a 3-tuple containing two empty strings, followed by
the string itself.
str.rsplit(sep=None, maxsplit=-1)
Return a list of the words in the string, using *sep* as the
delimiter string. If *maxsplit* is given, at most *maxsplit* splits
are done, the *rightmost* ones. If *sep* is not specified or
"None", any whitespace string is a separator. Except for splitting
from the right, "rsplit()" behaves like "split()" which is
described in detail below.
str.rstrip([chars])
Return a copy of the string with trailing characters removed. The
*chars* argument is a string specifying the set of characters to be
removed. If omitted or "None", the *chars* argument defaults to
removing whitespace. The *chars* argument is not a suffix; rather,
all combinations of its values are stripped:
>>> ' spacious '.rstrip()
' spacious'
>>> 'mississippi'.rstrip('ipz')
'mississ'
str.split(sep=None, maxsplit=-1)
Return a list of the words in the string, using *sep* as the
delimiter string. If *maxsplit* is given, at most *maxsplit*
splits are done (thus, the list will have at most "maxsplit+1"
elements). If *maxsplit* is not specified or "-1", then there is
no limit on the number of splits (all possible splits are made).
If *sep* is given, consecutive delimiters are not grouped together
and are deemed to delimit empty strings (for example,
"'1,,2'.split(',')" returns "['1', '', '2']"). The *sep* argument
may consist of multiple characters (for example,
"'1<>2<>3'.split('<>')" returns "['1', '2', '3']"). Splitting an
empty string with a specified separator returns "['']".
For example:
>>> '1,2,3'.split(',')
['1', '2', '3']
>>> '1,2,3'.split(',', maxsplit=1)
['1', '2,3']
>>> '1,2,,3,'.split(',')
['1', '2', '', '3', '']
If *sep* is not specified or is "None", a different splitting
algorithm is applied: runs of consecutive whitespace are regarded
as a single separator, and the result will contain no empty strings
at the start or end if the string has leading or trailing
whitespace. Consequently, splitting an empty string or a string
consisting of just whitespace with a "None" separator returns "[]".
For example:
>>> '1 2 3'.split()
['1', '2', '3']
>>> '1 2 3'.split(maxsplit=1)
['1', '2 3']
>>> ' 1 2 3 '.split()
['1', '2', '3']
str.splitlines([keepends])
Return a list of the lines in the string, breaking at line
boundaries. Line breaks are not included in the resulting list
unless *keepends* is given and true.
This method splits on the following line boundaries. In
particular, the boundaries are a superset of *universal newlines*.
+-------------------------+-------------------------------+
| Representation | Description |
|=========================|===============================|
| "\n" | Line Feed |
+-------------------------+-------------------------------+
| "\r" | Carriage Return |
+-------------------------+-------------------------------+
| "\r\n" | Carriage Return + Line Feed |
+-------------------------+-------------------------------+
| "\v" or "\x0b" | Line Tabulation |
+-------------------------+-------------------------------+
| "\f" or "\x0c" | Form Feed |
+-------------------------+-------------------------------+
| "\x1c" | File Separator |
+-------------------------+-------------------------------+
| "\x1d" | Group Separator |
+-------------------------+-------------------------------+
| "\x1e" | Record Separator |
+-------------------------+-------------------------------+
| "\x85" | Next Line (C1 Control Code) |
+-------------------------+-------------------------------+
| "\u2028" | Line Separator |
+-------------------------+-------------------------------+
| "\u2029" | Paragraph Separator |
+-------------------------+-------------------------------+
Changed in version 3.2: "\v" and "\f" added to list of line
boundaries.
For example:
>>> 'ab c\n\nde fg\rkl\r\n'.splitlines()
['ab c', '', 'de fg', 'kl']
>>> 'ab c\n\nde fg\rkl\r\n'.splitlines(keepends=True)
['ab c\n', '\n', 'de fg\r', 'kl\r\n']
Unlike "split()" when a delimiter string *sep* is given, this
method returns an empty list for the empty string, and a terminal
line break does not result in an extra line:
>>> "".splitlines()
[]
>>> "One line\n".splitlines()
['One line']
For comparison, "split('\n')" gives:
>>> ''.split('\n')
['']
>>> 'Two lines\n'.split('\n')
['Two lines', '']
str.startswith(prefix[, start[, end]])
Return "True" if string starts with the *prefix*, otherwise return
"False". *prefix* can also be a tuple of prefixes to look for.
With optional *start*, test string beginning at that position.
With optional *end*, stop comparing string at that position.
str.strip([chars])
Return a copy of the string with the leading and trailing
characters removed. The *chars* argument is a string specifying the
set of characters to be removed. If omitted or "None", the *chars*
argument defaults to removing whitespace. The *chars* argument is
not a prefix or suffix; rather, all combinations of its values are
stripped:
>>> ' spacious '.strip()
'spacious'
>>> 'www.example.com'.strip('cmowz.')
'example'
The outermost leading and trailing *chars* argument values are
stripped from the string. Characters are removed from the leading
end until reaching a string character that is not contained in the
set of characters in *chars*. A similar action takes place on the
trailing end. For example:
>>> comment_string = '#....... Section 3.2.1 Issue #32 .......'
>>> comment_string.strip('.#! ')
'Section 3.2.1 Issue #32'
str.swapcase()
Return a copy of the string with uppercase characters converted to
lowercase and vice versa. Note that it is not necessarily true that
"s.swapcase().swapcase() == s".
str.title()
Return a titlecased version of the string where words start with an
uppercase character and the remaining characters are lowercase.
For example:
>>> 'Hello world'.title()
'Hello World'
The algorithm uses a simple language-independent definition of a
word as groups of consecutive letters. The definition works in
many contexts but it means that apostrophes in contractions and
possessives form word boundaries, which may not be the desired
result:
>>> "they're bill's friends from the UK".title()
"They'Re Bill'S Friends From The Uk"
A workaround for apostrophes can be constructed using regular
expressions:
>>> import re
>>> def titlecase(s):
... return re.sub(r"[A-Za-z]+('[A-Za-z]+)?",
... lambda mo: mo.group(0).capitalize(),
... s)
...
>>> titlecase("they're bill's friends.")
"They're Bill's Friends."
str.translate(table)
Return a copy of the string in which each character has been mapped
through the given translation table. The table must be an object
that implements indexing via "__getitem__()", typically a *mapping*
or *sequence*. When indexed by a Unicode ordinal (an integer), the
table object can do any of the following: return a Unicode ordinal
or a string, to map the character to one or more other characters;
return "None", to delete the character from the return string; or
raise a "LookupError" exception, to map the character to itself.
You can use "str.maketrans()" to create a translation map from
character-to-character mappings in different formats.
See also the "codecs" module for a more flexible approach to custom
character mappings.
str.upper()
Return a copy of the string with all the cased characters [4]
converted to uppercase. Note that "s.upper().isupper()" might be
"False" if "s" contains uncased characters or if the Unicode
category of the resulting character(s) is not “Lu” (Letter,
uppercase), but e.g. “Lt” (Letter, titlecase).
The uppercasing algorithm used is described in section 3.13 of the
Unicode Standard.
str.zfill(width)
Return a copy of the string left filled with ASCII "'0'" digits to
make a string of length *width*. A leading sign prefix
("'+'"/"'-'") is handled by inserting the padding *after* the sign
character rather than before. The original string is returned if
*width* is less than or equal to "len(s)".
For example:
>>> "42".zfill(5)
'00042'
>>> "-42".zfill(5)
'-0042'
u� String and Bytes literals
*************************
String literals are described by the following lexical definitions:
stringliteral ::= [stringprefix](shortstring | longstring)
stringprefix ::= "r" | "u" | "R" | "U" | "f" | "F"
| "fr" | "Fr" | "fR" | "FR" | "rf" | "rF" | "Rf" | "RF"
shortstring ::= "'" shortstringitem* "'" | '"' shortstringitem* '"'
longstring ::= "'''" longstringitem* "'''" | '"""' longstringitem* '"""'
shortstringitem ::= shortstringchar | stringescapeseq
longstringitem ::= longstringchar | stringescapeseq
shortstringchar ::= <any source character except "\" or newline or the quote>
longstringchar ::= <any source character except "\">
stringescapeseq ::= "\" <any source character>
bytesliteral ::= bytesprefix(shortbytes | longbytes)
bytesprefix ::= "b" | "B" | "br" | "Br" | "bR" | "BR" | "rb" | "rB" | "Rb" | "RB"
shortbytes ::= "'" shortbytesitem* "'" | '"' shortbytesitem* '"'
longbytes ::= "'''" longbytesitem* "'''" | '"""' longbytesitem* '"""'
shortbytesitem ::= shortbyteschar | bytesescapeseq
longbytesitem ::= longbyteschar | bytesescapeseq
shortbyteschar ::= <any ASCII character except "\" or newline or the quote>
longbyteschar ::= <any ASCII character except "\">
bytesescapeseq ::= "\" <any ASCII character>
One syntactic restriction not indicated by these productions is that
whitespace is not allowed between the "stringprefix" or "bytesprefix"
and the rest of the literal. The source character set is defined by
the encoding declaration; it is UTF-8 if no encoding declaration is
given in the source file; see section Encoding declarations.
In plain English: Both types of literals can be enclosed in matching
single quotes ("'") or double quotes ("""). They can also be enclosed
in matching groups of three single or double quotes (these are
generally referred to as *triple-quoted strings*). The backslash
("\") character is used to escape characters that otherwise have a
special meaning, such as newline, backslash itself, or the quote
character.
Bytes literals are always prefixed with "'b'" or "'B'"; they produce
an instance of the "bytes" type instead of the "str" type. They may
only contain ASCII characters; bytes with a numeric value of 128 or
greater must be expressed with escapes.
Both string and bytes literals may optionally be prefixed with a
letter "'r'" or "'R'"; such strings are called *raw strings* and treat
backslashes as literal characters. As a result, in string literals,
"'\U'" and "'\u'" escapes in raw strings are not treated specially.
Given that Python 2.x’s raw unicode literals behave differently than
Python 3.x’s the "'ur'" syntax is not supported.
New in version 3.3: The "'rb'" prefix of raw bytes literals has been
added as a synonym of "'br'".
New in version 3.3: Support for the unicode legacy literal
("u'value'") was reintroduced to simplify the maintenance of dual
Python 2.x and 3.x codebases. See **PEP 414** for more information.
A string literal with "'f'" or "'F'" in its prefix is a *formatted
string literal*; see Formatted string literals. The "'f'" may be
combined with "'r'", but not with "'b'" or "'u'", therefore raw
formatted strings are possible, but formatted bytes literals are not.
In triple-quoted literals, unescaped newlines and quotes are allowed
(and are retained), except that three unescaped quotes in a row
terminate the literal. (A “quote” is the character used to open the
literal, i.e. either "'" or """.)
Unless an "'r'" or "'R'" prefix is present, escape sequences in string
and bytes literals are interpreted according to rules similar to those
used by Standard C. The recognized escape sequences are:
+-------------------+-----------------------------------+---------+
| Escape Sequence | Meaning | Notes |
|===================|===================================|=========|
| "\newline" | Backslash and newline ignored | |
+-------------------+-----------------------------------+---------+
| "\\" | Backslash ("\") | |
+-------------------+-----------------------------------+---------+
| "\'" | Single quote ("'") | |
+-------------------+-----------------------------------+---------+
| "\"" | Double quote (""") | |
+-------------------+-----------------------------------+---------+
| "\a" | ASCII Bell (BEL) | |
+-------------------+-----------------------------------+---------+
| "\b" | ASCII Backspace (BS) | |
+-------------------+-----------------------------------+---------+
| "\f" | ASCII Formfeed (FF) | |
+-------------------+-----------------------------------+---------+
| "\n" | ASCII Linefeed (LF) | |
+-------------------+-----------------------------------+---------+
| "\r" | ASCII Carriage Return (CR) | |
+-------------------+-----------------------------------+---------+
| "\t" | ASCII Horizontal Tab (TAB) | |
+-------------------+-----------------------------------+---------+
| "\v" | ASCII Vertical Tab (VT) | |
+-------------------+-----------------------------------+---------+
| "\ooo" | Character with octal value *ooo* | (1,3) |
+-------------------+-----------------------------------+---------+
| "\xhh" | Character with hex value *hh* | (2,3) |
+-------------------+-----------------------------------+---------+
Escape sequences only recognized in string literals are:
+-------------------+-----------------------------------+---------+
| Escape Sequence | Meaning | Notes |
|===================|===================================|=========|
| "\N{name}" | Character named *name* in the | (4) |
| | Unicode database | |
+-------------------+-----------------------------------+---------+
| "\uxxxx" | Character with 16-bit hex value | (5) |
| | *xxxx* | |
+-------------------+-----------------------------------+---------+
| "\Uxxxxxxxx" | Character with 32-bit hex value | (6) |
| | *xxxxxxxx* | |
+-------------------+-----------------------------------+---------+
Notes:
1. As in Standard C, up to three octal digits are accepted.
2. Unlike in Standard C, exactly two hex digits are required.
3. In a bytes literal, hexadecimal and octal escapes denote the byte
with the given value. In a string literal, these escapes denote a
Unicode character with the given value.
4. Changed in version 3.3: Support for name aliases [1] has been
added.
5. Exactly four hex digits are required.
6. Any Unicode character can be encoded this way. Exactly eight hex
digits are required.
Unlike Standard C, all unrecognized escape sequences are left in the
string unchanged, i.e., *the backslash is left in the result*. (This
behavior is useful when debugging: if an escape sequence is mistyped,
the resulting output is more easily recognized as broken.) It is also
important to note that the escape sequences only recognized in string
literals fall into the category of unrecognized escapes for bytes
literals.
Changed in version 3.6: Unrecognized escape sequences produce a
"DeprecationWarning". In a future Python version they will be a
"SyntaxWarning" and eventually a "SyntaxError".
Even in a raw literal, quotes can be escaped with a backslash, but the
backslash remains in the result; for example, "r"\""" is a valid
string literal consisting of two characters: a backslash and a double
quote; "r"\"" is not a valid string literal (even a raw string cannot
end in an odd number of backslashes). Specifically, *a raw literal
cannot end in a single backslash* (since the backslash would escape
the following quote character). Note also that a single backslash
followed by a newline is interpreted as those two characters as part
of the literal, *not* as a line continuation.
uM Subscriptions
*************
A subscription selects an item of a sequence (string, tuple or list)
or mapping (dictionary) object:
subscription ::= primary "[" expression_list "]"
The primary must evaluate to an object that supports subscription
(lists or dictionaries for example). User-defined objects can support
subscription by defining a "__getitem__()" method.
For built-in objects, there are two types of objects that support
subscription:
If the primary is a mapping, the expression list must evaluate to an
object whose value is one of the keys of the mapping, and the
subscription selects the value in the mapping that corresponds to that
key. (The expression list is a tuple except if it has exactly one
item.)
If the primary is a sequence, the expression list must evaluate to an
integer or a slice (as discussed in the following section).
The formal syntax makes no special provision for negative indices in
sequences; however, built-in sequences all provide a "__getitem__()"
method that interprets negative indices by adding the length of the
sequence to the index (so that "x[-1]" selects the last item of "x").
The resulting value must be a nonnegative integer less than the number
of items in the sequence, and the subscription selects the item whose
index is that value (counting from zero). Since the support for
negative indices and slicing occurs in the object’s "__getitem__()"
method, subclasses overriding this method will need to explicitly add
that support.
A string’s items are characters. A character is not a separate data
type but a string of exactly one character.
ax Truth Value Testing
*******************
Any object can be tested for truth value, for use in an "if" or
"while" condition or as operand of the Boolean operations below.
By default, an object is considered true unless its class defines
either a "__bool__()" method that returns "False" or a "__len__()"
method that returns zero, when called with the object. [1] Here are
most of the built-in objects considered false:
* constants defined to be false: "None" and "False".
* zero of any numeric type: "0", "0.0", "0j", "Decimal(0)",
"Fraction(0, 1)"
* empty sequences and collections: "''", "()", "[]", "{}", "set()",
"range(0)"
Operations and built-in functions that have a Boolean result always
return "0" or "False" for false and "1" or "True" for true, unless
otherwise stated. (Important exception: the Boolean operations "or"
and "and" always return one of their operands.)
uR The "try" statement
*******************
The "try" statement specifies exception handlers and/or cleanup code
for a group of statements:
try_stmt ::= try1_stmt | try2_stmt
try1_stmt ::= "try" ":" suite
("except" [expression ["as" identifier]] ":" suite)+
["else" ":" suite]
["finally" ":" suite]
try2_stmt ::= "try" ":" suite
"finally" ":" suite
The "except" clause(s) specify one or more exception handlers. When no
exception occurs in the "try" clause, no exception handler is
executed. When an exception occurs in the "try" suite, a search for an
exception handler is started. This search inspects the except clauses
in turn until one is found that matches the exception. An expression-
less except clause, if present, must be last; it matches any
exception. For an except clause with an expression, that expression
is evaluated, and the clause matches the exception if the resulting
object is “compatible” with the exception. An object is compatible
with an exception if it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base
class of the exception object.
If no except clause matches the exception, the search for an exception
handler continues in the surrounding code and on the invocation stack.
[1]
If the evaluation of an expression in the header of an except clause
raises an exception, the original search for a handler is canceled and
a search starts for the new exception in the surrounding code and on
the call stack (it is treated as if the entire "try" statement raised
the exception).
When a matching except clause is found, the exception is assigned to
the target specified after the "as" keyword in that except clause, if
present, and the except clause’s suite is executed. All except
clauses must have an executable block. When the end of this block is
reached, execution continues normally after the entire try statement.
(This means that if two nested handlers exist for the same exception,
and the exception occurs in the try clause of the inner handler, the
outer handler will not handle the exception.)
When an exception has been assigned using "as target", it is cleared
at the end of the except clause. This is as if
except E as N:
foo
was translated to
except E as N:
try:
foo
finally:
del N
This means the exception must be assigned to a different name to be
able to refer to it after the except clause. Exceptions are cleared
because with the traceback attached to them, they form a reference
cycle with the stack frame, keeping all locals in that frame alive
until the next garbage collection occurs.
Before an except clause’s suite is executed, details about the
exception are stored in the "sys" module and can be accessed via
"sys.exc_info()". "sys.exc_info()" returns a 3-tuple consisting of the
exception class, the exception instance and a traceback object (see
section The standard type hierarchy) identifying the point in the
program where the exception occurred. "sys.exc_info()" values are
restored to their previous values (before the call) when returning
from a function that handled an exception.
The optional "else" clause is executed if the control flow leaves the
"try" suite, no exception was raised, and no "return", "continue", or
"break" statement was executed. Exceptions in the "else" clause are
not handled by the preceding "except" clauses.
If "finally" is present, it specifies a ‘cleanup’ handler. The "try"
clause is executed, including any "except" and "else" clauses. If an
exception occurs in any of the clauses and is not handled, the
exception is temporarily saved. The "finally" clause is executed. If
there is a saved exception it is re-raised at the end of the "finally"
clause. If the "finally" clause raises another exception, the saved
exception is set as the context of the new exception. If the "finally"
clause executes a "return", "break" or "continue" statement, the saved
exception is discarded:
>>> def f():
... try:
... 1/0
... finally:
... return 42
...
>>> f()
42
The exception information is not available to the program during
execution of the "finally" clause.
When a "return", "break" or "continue" statement is executed in the
"try" suite of a "try"…"finally" statement, the "finally" clause is
also executed ‘on the way out.’
The return value of a function is determined by the last "return"
statement executed. Since the "finally" clause always executes, a
"return" statement executed in the "finally" clause will always be the
last one executed:
>>> def foo():
... try:
... return 'try'
... finally:
... return 'finally'
...
>>> foo()
'finally'
Additional information on exceptions can be found in section
Exceptions, and information on using the "raise" statement to generate
exceptions may be found in section The raise statement.
Changed in version 3.8: Prior to Python 3.8, a "continue" statement
was illegal in the "finally" clause due to a problem with the
implementation.
ux� The standard type hierarchy
***************************
Below is a list of the types that are built into Python. Extension
modules (written in C, Java, or other languages, depending on the
implementation) can define additional types. Future versions of
Python may add types to the type hierarchy (e.g., rational numbers,
efficiently stored arrays of integers, etc.), although such additions
will often be provided via the standard library instead.
Some of the type descriptions below contain a paragraph listing
‘special attributes.’ These are attributes that provide access to the
implementation and are not intended for general use. Their definition
may change in the future.
None
This type has a single value. There is a single object with this
value. This object is accessed through the built-in name "None". It
is used to signify the absence of a value in many situations, e.g.,
it is returned from functions that don’t explicitly return
anything. Its truth value is false.
NotImplemented
This type has a single value. There is a single object with this
value. This object is accessed through the built-in name
"NotImplemented". Numeric methods and rich comparison methods
should return this value if they do not implement the operation for
the operands provided. (The interpreter will then try the
reflected operation, or some other fallback, depending on the
operator.) Its truth value is true.
See Implementing the arithmetic operations for more details.
Ellipsis
This type has a single value. There is a single object with this
value. This object is accessed through the literal "..." or the
built-in name "Ellipsis". Its truth value is true.
"numbers.Number"
These are created by numeric literals and returned as results by
arithmetic operators and arithmetic built-in functions. Numeric
objects are immutable; once created their value never changes.
Python numbers are of course strongly related to mathematical
numbers, but subject to the limitations of numerical representation
in computers.
The string representations of the numeric classes, computed by
"__repr__()" and "__str__()", have the following properties:
* They are valid numeric literals which, when passed to their class
constructor, produce an object having the value of the original
numeric.
* The representation is in base 10, when possible.
* Leading zeros, possibly excepting a single zero before a decimal
point, are not shown.
* Trailing zeros, possibly excepting a single zero after a decimal
point, are not shown.
* A sign is shown only when the number is negative.
Python distinguishes between integers, floating point numbers, and
complex numbers:
"numbers.Integral"
These represent elements from the mathematical set of integers
(positive and negative).
There are two types of integers:
Integers ("int")
These represent numbers in an unlimited range, subject to
available (virtual) memory only. For the purpose of shift
and mask operations, a binary representation is assumed, and
negative numbers are represented in a variant of 2’s
complement which gives the illusion of an infinite string of
sign bits extending to the left.
Booleans ("bool")
These represent the truth values False and True. The two
objects representing the values "False" and "True" are the
only Boolean objects. The Boolean type is a subtype of the
integer type, and Boolean values behave like the values 0 and
1, respectively, in almost all contexts, the exception being
that when converted to a string, the strings ""False"" or
""True"" are returned, respectively.
The rules for integer representation are intended to give the
most meaningful interpretation of shift and mask operations
involving negative integers.
"numbers.Real" ("float")
These represent machine-level double precision floating point
numbers. You are at the mercy of the underlying machine
architecture (and C or Java implementation) for the accepted
range and handling of overflow. Python does not support single-
precision floating point numbers; the savings in processor and
memory usage that are usually the reason for using these are
dwarfed by the overhead of using objects in Python, so there is
no reason to complicate the language with two kinds of floating
point numbers.
"numbers.Complex" ("complex")
These represent complex numbers as a pair of machine-level
double precision floating point numbers. The same caveats apply
as for floating point numbers. The real and imaginary parts of a
complex number "z" can be retrieved through the read-only
attributes "z.real" and "z.imag".
Sequences
These represent finite ordered sets indexed by non-negative
numbers. The built-in function "len()" returns the number of items
of a sequence. When the length of a sequence is *n*, the index set
contains the numbers 0, 1, …, *n*-1. Item *i* of sequence *a* is
selected by "a[i]".
Sequences also support slicing: "a[i:j]" selects all items with
index *k* such that *i* "<=" *k* "<" *j*. When used as an
expression, a slice is a sequence of the same type. This implies
that the index set is renumbered so that it starts at 0.
Some sequences also support “extended slicing” with a third “step”
parameter: "a[i:j:k]" selects all items of *a* with index *x* where
"x = i + n*k", *n* ">=" "0" and *i* "<=" *x* "<" *j*.
Sequences are distinguished according to their mutability:
Immutable sequences
An object of an immutable sequence type cannot change once it is
created. (If the object contains references to other objects,
these other objects may be mutable and may be changed; however,
the collection of objects directly referenced by an immutable
object cannot change.)
The following types are immutable sequences:
Strings
A string is a sequence of values that represent Unicode code
points. All the code points in the range "U+0000 - U+10FFFF"
can be represented in a string. Python doesn’t have a "char"
type; instead, every code point in the string is represented
as a string object with length "1". The built-in function
"ord()" converts a code point from its string form to an
integer in the range "0 - 10FFFF"; "chr()" converts an
integer in the range "0 - 10FFFF" to the corresponding length
"1" string object. "str.encode()" can be used to convert a
"str" to "bytes" using the given text encoding, and
"bytes.decode()" can be used to achieve the opposite.
Tuples
The items of a tuple are arbitrary Python objects. Tuples of
two or more items are formed by comma-separated lists of
expressions. A tuple of one item (a ‘singleton’) can be
formed by affixing a comma to an expression (an expression by
itself does not create a tuple, since parentheses must be
usable for grouping of expressions). An empty tuple can be
formed by an empty pair of parentheses.
Bytes
A bytes object is an immutable array. The items are 8-bit
bytes, represented by integers in the range 0 <= x < 256.
Bytes literals (like "b'abc'") and the built-in "bytes()"
constructor can be used to create bytes objects. Also, bytes
objects can be decoded to strings via the "decode()" method.
Mutable sequences
Mutable sequences can be changed after they are created. The
subscription and slicing notations can be used as the target of
assignment and "del" (delete) statements.
There are currently two intrinsic mutable sequence types:
Lists
The items of a list are arbitrary Python objects. Lists are
formed by placing a comma-separated list of expressions in
square brackets. (Note that there are no special cases needed
to form lists of length 0 or 1.)
Byte Arrays
A bytearray object is a mutable array. They are created by
the built-in "bytearray()" constructor. Aside from being
mutable (and hence unhashable), byte arrays otherwise provide
the same interface and functionality as immutable "bytes"
objects.
The extension module "array" provides an additional example of a
mutable sequence type, as does the "collections" module.
Set types
These represent unordered, finite sets of unique, immutable
objects. As such, they cannot be indexed by any subscript. However,
they can be iterated over, and the built-in function "len()"
returns the number of items in a set. Common uses for sets are fast
membership testing, removing duplicates from a sequence, and
computing mathematical operations such as intersection, union,
difference, and symmetric difference.
For set elements, the same immutability rules apply as for
dictionary keys. Note that numeric types obey the normal rules for
numeric comparison: if two numbers compare equal (e.g., "1" and
"1.0"), only one of them can be contained in a set.
There are currently two intrinsic set types:
Sets
These represent a mutable set. They are created by the built-in
"set()" constructor and can be modified afterwards by several
methods, such as "add()".
Frozen sets
These represent an immutable set. They are created by the
built-in "frozenset()" constructor. As a frozenset is immutable
and *hashable*, it can be used again as an element of another
set, or as a dictionary key.
Mappings
These represent finite sets of objects indexed by arbitrary index
sets. The subscript notation "a[k]" selects the item indexed by "k"
from the mapping "a"; this can be used in expressions and as the
target of assignments or "del" statements. The built-in function
"len()" returns the number of items in a mapping.
There is currently a single intrinsic mapping type:
Dictionaries
These represent finite sets of objects indexed by nearly
arbitrary values. The only types of values not acceptable as
keys are values containing lists or dictionaries or other
mutable types that are compared by value rather than by object
identity, the reason being that the efficient implementation of
dictionaries requires a key’s hash value to remain constant.
Numeric types used for keys obey the normal rules for numeric
comparison: if two numbers compare equal (e.g., "1" and "1.0")
then they can be used interchangeably to index the same
dictionary entry.
Dictionaries preserve insertion order, meaning that keys will be
produced in the same order they were added sequentially over the
dictionary. Replacing an existing key does not change the order,
however removing a key and re-inserting it will add it to the
end instead of keeping its old place.
Dictionaries are mutable; they can be created by the "{...}"
notation (see section Dictionary displays).
The extension modules "dbm.ndbm" and "dbm.gnu" provide
additional examples of mapping types, as does the "collections"
module.
Changed in version 3.7: Dictionaries did not preserve insertion
order in versions of Python before 3.6. In CPython 3.6,
insertion order was preserved, but it was considered an
implementation detail at that time rather than a language
guarantee.
Callable types
These are the types to which the function call operation (see
section Calls) can be applied:
User-defined functions
A user-defined function object is created by a function
definition (see section Function definitions). It should be
called with an argument list containing the same number of items
as the function’s formal parameter list.
Special attributes:
+---------------------------+---------------------------------+-------------+
| Attribute | Meaning | |
|===========================|=================================|=============|
| "__doc__" | The function’s documentation | Writable |
| | string, or "None" if | |
| | unavailable; not inherited by | |
| | subclasses. | |
+---------------------------+---------------------------------+-------------+
| "__name__" | The function’s name. | Writable |
+---------------------------+---------------------------------+-------------+
| "__qualname__" | The function’s *qualified | Writable |
| | name*. New in version 3.3. | |
+---------------------------+---------------------------------+-------------+
| "__module__" | The name of the module the | Writable |
| | function was defined in, or | |
| | "None" if unavailable. | |
+---------------------------+---------------------------------+-------------+
| "__defaults__" | A tuple containing default | Writable |
| | argument values for those | |
| | arguments that have defaults, | |
| | or "None" if no arguments have | |
| | a default value. | |
+---------------------------+---------------------------------+-------------+
| "__code__" | The code object representing | Writable |
| | the compiled function body. | |
+---------------------------+---------------------------------+-------------+
| "__globals__" | A reference to the dictionary | Read-only |
| | that holds the function’s | |
| | global variables — the global | |
| | namespace of the module in | |
| | which the function was defined. | |
+---------------------------+---------------------------------+-------------+
| "__dict__" | The namespace supporting | Writable |
| | arbitrary function attributes. | |
+---------------------------+---------------------------------+-------------+
| "__closure__" | "None" or a tuple of cells that | Read-only |
| | contain bindings for the | |
| | function’s free variables. See | |
| | below for information on the | |
| | "cell_contents" attribute. | |
+---------------------------+---------------------------------+-------------+
| "__annotations__" | A dict containing annotations | Writable |
| | of parameters. The keys of the | |
| | dict are the parameter names, | |
| | and "'return'" for the return | |
| | annotation, if provided. | |
+---------------------------+---------------------------------+-------------+
| "__kwdefaults__" | A dict containing defaults for | Writable |
| | keyword-only parameters. | |
+---------------------------+---------------------------------+-------------+
Most of the attributes labelled “Writable” check the type of the
assigned value.
Function objects also support getting and setting arbitrary
attributes, which can be used, for example, to attach metadata
to functions. Regular attribute dot-notation is used to get and
set such attributes. *Note that the current implementation only
supports function attributes on user-defined functions. Function
attributes on built-in functions may be supported in the
future.*
A cell object has the attribute "cell_contents". This can be
used to get the value of the cell, as well as set the value.
Additional information about a function’s definition can be
retrieved from its code object; see the description of internal
types below. The "cell" type can be accessed in the "types"
module.
Instance methods
An instance method object combines a class, a class instance and
any callable object (normally a user-defined function).
Special read-only attributes: "__self__" is the class instance
object, "__func__" is the function object; "__doc__" is the
method’s documentation (same as "__func__.__doc__"); "__name__"
is the method name (same as "__func__.__name__"); "__module__"
is the name of the module the method was defined in, or "None"
if unavailable.
Methods also support accessing (but not setting) the arbitrary
function attributes on the underlying function object.
User-defined method objects may be created when getting an
attribute of a class (perhaps via an instance of that class), if
that attribute is a user-defined function object or a class
method object.
When an instance method object is created by retrieving a user-
defined function object from a class via one of its instances,
its "__self__" attribute is the instance, and the method object
is said to be bound. The new method’s "__func__" attribute is
the original function object.
When an instance method object is created by retrieving a class
method object from a class or instance, its "__self__" attribute
is the class itself, and its "__func__" attribute is the
function object underlying the class method.
When an instance method object is called, the underlying
function ("__func__") is called, inserting the class instance
("__self__") in front of the argument list. For instance, when
"C" is a class which contains a definition for a function "f()",
and "x" is an instance of "C", calling "x.f(1)" is equivalent to
calling "C.f(x, 1)".
When an instance method object is derived from a class method
object, the “class instance” stored in "__self__" will actually
be the class itself, so that calling either "x.f(1)" or "C.f(1)"
is equivalent to calling "f(C,1)" where "f" is the underlying
function.
Note that the transformation from function object to instance
method object happens each time the attribute is retrieved from
the instance. In some cases, a fruitful optimization is to
assign the attribute to a local variable and call that local
variable. Also notice that this transformation only happens for
user-defined functions; other callable objects (and all non-
callable objects) are retrieved without transformation. It is
also important to note that user-defined functions which are
attributes of a class instance are not converted to bound
methods; this *only* happens when the function is an attribute
of the class.
Generator functions
A function or method which uses the "yield" statement (see
section The yield statement) is called a *generator function*.
Such a function, when called, always returns an iterator object
which can be used to execute the body of the function: calling
the iterator’s "iterator.__next__()" method will cause the
function to execute until it provides a value using the "yield"
statement. When the function executes a "return" statement or
falls off the end, a "StopIteration" exception is raised and the
iterator will have reached the end of the set of values to be
returned.
Coroutine functions
A function or method which is defined using "async def" is
called a *coroutine function*. Such a function, when called,
returns a *coroutine* object. It may contain "await"
expressions, as well as "async with" and "async for" statements.
See also the Coroutine Objects section.
Asynchronous generator functions
A function or method which is defined using "async def" and
which uses the "yield" statement is called a *asynchronous
generator function*. Such a function, when called, returns an
asynchronous iterator object which can be used in an "async for"
statement to execute the body of the function.
Calling the asynchronous iterator’s "aiterator.__anext__()"
method will return an *awaitable* which when awaited will
execute until it provides a value using the "yield" expression.
When the function executes an empty "return" statement or falls
off the end, a "StopAsyncIteration" exception is raised and the
asynchronous iterator will have reached the end of the set of
values to be yielded.
Built-in functions
A built-in function object is a wrapper around a C function.
Examples of built-in functions are "len()" and "math.sin()"
("math" is a standard built-in module). The number and type of
the arguments are determined by the C function. Special read-
only attributes: "__doc__" is the function’s documentation
string, or "None" if unavailable; "__name__" is the function’s
name; "__self__" is set to "None" (but see the next item);
"__module__" is the name of the module the function was defined
in or "None" if unavailable.
Built-in methods
This is really a different disguise of a built-in function, this
time containing an object passed to the C function as an
implicit extra argument. An example of a built-in method is
"alist.append()", assuming *alist* is a list object. In this
case, the special read-only attribute "__self__" is set to the
object denoted by *alist*.
Classes
Classes are callable. These objects normally act as factories
for new instances of themselves, but variations are possible for
class types that override "__new__()". The arguments of the
call are passed to "__new__()" and, in the typical case, to
"__init__()" to initialize the new instance.
Class Instances
Instances of arbitrary classes can be made callable by defining
a "__call__()" method in their class.
Modules
Modules are a basic organizational unit of Python code, and are
created by the import system as invoked either by the "import"
statement, or by calling functions such as
"importlib.import_module()" and built-in "__import__()". A module
object has a namespace implemented by a dictionary object (this is
the dictionary referenced by the "__globals__" attribute of
functions defined in the module). Attribute references are
translated to lookups in this dictionary, e.g., "m.x" is equivalent
to "m.__dict__["x"]". A module object does not contain the code
object used to initialize the module (since it isn’t needed once
the initialization is done).
Attribute assignment updates the module’s namespace dictionary,
e.g., "m.x = 1" is equivalent to "m.__dict__["x"] = 1".
Predefined (writable) attributes: "__name__" is the module’s name;
"__doc__" is the module’s documentation string, or "None" if
unavailable; "__annotations__" (optional) is a dictionary
containing *variable annotations* collected during module body
execution; "__file__" is the pathname of the file from which the
module was loaded, if it was loaded from a file. The "__file__"
attribute may be missing for certain types of modules, such as C
modules that are statically linked into the interpreter; for
extension modules loaded dynamically from a shared library, it is
the pathname of the shared library file.
Special read-only attribute: "__dict__" is the module’s namespace
as a dictionary object.
**CPython implementation detail:** Because of the way CPython
clears module dictionaries, the module dictionary will be cleared
when the module falls out of scope even if the dictionary still has
live references. To avoid this, copy the dictionary or keep the
module around while using its dictionary directly.
Custom classes
Custom class types are typically created by class definitions (see
section Class definitions). A class has a namespace implemented by
a dictionary object. Class attribute references are translated to
lookups in this dictionary, e.g., "C.x" is translated to
"C.__dict__["x"]" (although there are a number of hooks which allow
for other means of locating attributes). When the attribute name is
not found there, the attribute search continues in the base
classes. This search of the base classes uses the C3 method
resolution order which behaves correctly even in the presence of
‘diamond’ inheritance structures where there are multiple
inheritance paths leading back to a common ancestor. Additional
details on the C3 MRO used by Python can be found in the
documentation accompanying the 2.3 release at
https://www.python.org/download/releases/2.3/mro/.
When a class attribute reference (for class "C", say) would yield a
class method object, it is transformed into an instance method
object whose "__self__" attribute is "C". When it would yield a
static method object, it is transformed into the object wrapped by
the static method object. See section Implementing Descriptors for
another way in which attributes retrieved from a class may differ
from those actually contained in its "__dict__".
Class attribute assignments update the class’s dictionary, never
the dictionary of a base class.
A class object can be called (see above) to yield a class instance
(see below).
Special attributes: "__name__" is the class name; "__module__" is
the module name in which the class was defined; "__dict__" is the
dictionary containing the class’s namespace; "__bases__" is a tuple
containing the base classes, in the order of their occurrence in
the base class list; "__doc__" is the class’s documentation string,
or "None" if undefined; "__annotations__" (optional) is a
dictionary containing *variable annotations* collected during class
body execution.
Class instances
A class instance is created by calling a class object (see above).
A class instance has a namespace implemented as a dictionary which
is the first place in which attribute references are searched.
When an attribute is not found there, and the instance’s class has
an attribute by that name, the search continues with the class
attributes. If a class attribute is found that is a user-defined
function object, it is transformed into an instance method object
whose "__self__" attribute is the instance. Static method and
class method objects are also transformed; see above under
“Classes”. See section Implementing Descriptors for another way in
which attributes of a class retrieved via its instances may differ
from the objects actually stored in the class’s "__dict__". If no
class attribute is found, and the object’s class has a
"__getattr__()" method, that is called to satisfy the lookup.
Attribute assignments and deletions update the instance’s
dictionary, never a class’s dictionary. If the class has a
"__setattr__()" or "__delattr__()" method, this is called instead
of updating the instance dictionary directly.
Class instances can pretend to be numbers, sequences, or mappings
if they have methods with certain special names. See section
Special method names.
Special attributes: "__dict__" is the attribute dictionary;
"__class__" is the instance’s class.
I/O objects (also known as file objects)
A *file object* represents an open file. Various shortcuts are
available to create file objects: the "open()" built-in function,
and also "os.popen()", "os.fdopen()", and the "makefile()" method
of socket objects (and perhaps by other functions or methods
provided by extension modules).
The objects "sys.stdin", "sys.stdout" and "sys.stderr" are
initialized to file objects corresponding to the interpreter’s
standard input, output and error streams; they are all open in text
mode and therefore follow the interface defined by the
"io.TextIOBase" abstract class.
Internal types
A few types used internally by the interpreter are exposed to the
user. Their definitions may change with future versions of the
interpreter, but they are mentioned here for completeness.
Code objects
Code objects represent *byte-compiled* executable Python code,
or *bytecode*. The difference between a code object and a
function object is that the function object contains an explicit
reference to the function’s globals (the module in which it was
defined), while a code object contains no context; also the
default argument values are stored in the function object, not
in the code object (because they represent values calculated at
run-time). Unlike function objects, code objects are immutable
and contain no references (directly or indirectly) to mutable
objects.
Special read-only attributes: "co_name" gives the function name;
"co_argcount" is the total number of positional arguments
(including positional-only arguments and arguments with default
values); "co_posonlyargcount" is the number of positional-only
arguments (including arguments with default values);
"co_kwonlyargcount" is the number of keyword-only arguments
(including arguments with default values); "co_nlocals" is the
number of local variables used by the function (including
arguments); "co_varnames" is a tuple containing the names of the
local variables (starting with the argument names);
"co_cellvars" is a tuple containing the names of local variables
that are referenced by nested functions; "co_freevars" is a
tuple containing the names of free variables; "co_code" is a
string representing the sequence of bytecode instructions;
"co_consts" is a tuple containing the literals used by the
bytecode; "co_names" is a tuple containing the names used by the
bytecode; "co_filename" is the filename from which the code was
compiled; "co_firstlineno" is the first line number of the
function; "co_lnotab" is a string encoding the mapping from
bytecode offsets to line numbers (for details see the source
code of the interpreter); "co_stacksize" is the required stack
size; "co_flags" is an integer encoding a number of flags for
the interpreter.
The following flag bits are defined for "co_flags": bit "0x04"
is set if the function uses the "*arguments" syntax to accept an
arbitrary number of positional arguments; bit "0x08" is set if
the function uses the "**keywords" syntax to accept arbitrary
keyword arguments; bit "0x20" is set if the function is a
generator.
Future feature declarations ("from __future__ import division")
also use bits in "co_flags" to indicate whether a code object
was compiled with a particular feature enabled: bit "0x2000" is
set if the function was compiled with future division enabled;
bits "0x10" and "0x1000" were used in earlier versions of
Python.
Other bits in "co_flags" are reserved for internal use.
If a code object represents a function, the first item in
"co_consts" is the documentation string of the function, or
"None" if undefined.
Frame objects
Frame objects represent execution frames. They may occur in
traceback objects (see below), and are also passed to registered
trace functions.
Special read-only attributes: "f_back" is to the previous stack
frame (towards the caller), or "None" if this is the bottom
stack frame; "f_code" is the code object being executed in this
frame; "f_locals" is the dictionary used to look up local
variables; "f_globals" is used for global variables;
"f_builtins" is used for built-in (intrinsic) names; "f_lasti"
gives the precise instruction (this is an index into the
bytecode string of the code object).
Accessing "f_code" raises an auditing event "object.__getattr__"
with arguments "obj" and ""f_code"".
Special writable attributes: "f_trace", if not "None", is a
function called for various events during code execution (this
is used by the debugger). Normally an event is triggered for
each new source line - this can be disabled by setting
"f_trace_lines" to "False".
Implementations *may* allow per-opcode events to be requested by
setting "f_trace_opcodes" to "True". Note that this may lead to
undefined interpreter behaviour if exceptions raised by the
trace function escape to the function being traced.
"f_lineno" is the current line number of the frame — writing to
this from within a trace function jumps to the given line (only
for the bottom-most frame). A debugger can implement a Jump
command (aka Set Next Statement) by writing to f_lineno.
Frame objects support one method:
frame.clear()
This method clears all references to local variables held by
the frame. Also, if the frame belonged to a generator, the
generator is finalized. This helps break reference cycles
involving frame objects (for example when catching an
exception and storing its traceback for later use).
"RuntimeError" is raised if the frame is currently executing.
New in version 3.4.
Traceback objects
Traceback objects represent a stack trace of an exception. A
traceback object is implicitly created when an exception occurs,
and may also be explicitly created by calling
"types.TracebackType".
For implicitly created tracebacks, when the search for an
exception handler unwinds the execution stack, at each unwound
level a traceback object is inserted in front of the current
traceback. When an exception handler is entered, the stack
trace is made available to the program. (See section The try
statement.) It is accessible as the third item of the tuple
returned by "sys.exc_info()", and as the "__traceback__"
attribute of the caught exception.
When the program contains no suitable handler, the stack trace
is written (nicely formatted) to the standard error stream; if
the interpreter is interactive, it is also made available to the
user as "sys.last_traceback".
For explicitly created tracebacks, it is up to the creator of
the traceback to determine how the "tb_next" attributes should
be linked to form a full stack trace.
Special read-only attributes: "tb_frame" points to the execution
frame of the current level; "tb_lineno" gives the line number
where the exception occurred; "tb_lasti" indicates the precise
instruction. The line number and last instruction in the
traceback may differ from the line number of its frame object if
the exception occurred in a "try" statement with no matching
except clause or with a finally clause.
Accessing "tb_frame" raises an auditing event
"object.__getattr__" with arguments "obj" and ""tb_frame"".
Special writable attribute: "tb_next" is the next level in the
stack trace (towards the frame where the exception occurred), or
"None" if there is no next level.
Changed in version 3.7: Traceback objects can now be explicitly
instantiated from Python code, and the "tb_next" attribute of
existing instances can be updated.
Slice objects
Slice objects are used to represent slices for "__getitem__()"
methods. They are also created by the built-in "slice()"
function.
Special read-only attributes: "start" is the lower bound; "stop"
is the upper bound; "step" is the step value; each is "None" if
omitted. These attributes can have any type.
Slice objects support one method:
slice.indices(self, length)
This method takes a single integer argument *length* and
computes information about the slice that the slice object
would describe if applied to a sequence of *length* items.
It returns a tuple of three integers; respectively these are
the *start* and *stop* indices and the *step* or stride
length of the slice. Missing or out-of-bounds indices are
handled in a manner consistent with regular slices.
Static method objects
Static method objects provide a way of defeating the
transformation of function objects to method objects described
above. A static method object is a wrapper around any other
object, usually a user-defined method object. When a static
method object is retrieved from a class or a class instance, the
object actually returned is the wrapped object, which is not
subject to any further transformation. Static method objects are
not themselves callable, although the objects they wrap usually
are. Static method objects are created by the built-in
"staticmethod()" constructor.
Class method objects
A class method object, like a static method object, is a wrapper
around another object that alters the way in which that object
is retrieved from classes and class instances. The behaviour of
class method objects upon such retrieval is described above,
under “User-defined methods”. Class method objects are created
by the built-in "classmethod()" constructor.
a� Functions
*********
Function objects are created by function definitions. The only
operation on a function object is to call it: "func(argument-list)".
There are really two flavors of function objects: built-in functions
and user-defined functions. Both support the same operation (to call
the function), but the implementation is different, hence the
different object types.
See Function definitions for more information.
u(. Mapping Types — "dict"
**********************
A *mapping* object maps *hashable* values to arbitrary objects.
Mappings are mutable objects. There is currently only one standard
mapping type, the *dictionary*. (For other containers see the built-
in "list", "set", and "tuple" classes, and the "collections" module.)
A dictionary’s keys are *almost* arbitrary values. Values that are
not *hashable*, that is, values containing lists, dictionaries or
other mutable types (that are compared by value rather than by object
identity) may not be used as keys. Numeric types used for keys obey
the normal rules for numeric comparison: if two numbers compare equal
(such as "1" and "1.0") then they can be used interchangeably to index
the same dictionary entry. (Note however, that since computers store
floating-point numbers as approximations it is usually unwise to use
them as dictionary keys.)
Dictionaries can be created by placing a comma-separated list of "key:
value" pairs within braces, for example: "{'jack': 4098, 'sjoerd':
4127}" or "{4098: 'jack', 4127: 'sjoerd'}", or by the "dict"
constructor.
class dict(**kwarg)
class dict(mapping, **kwarg)
class dict(iterable, **kwarg)
Return a new dictionary initialized from an optional positional
argument and a possibly empty set of keyword arguments.
Dictionaries can be created by several means:
* Use a comma-separated list of "key: value" pairs within braces:
"{'jack': 4098, 'sjoerd': 4127}" or "{4098: 'jack', 4127:
'sjoerd'}"
* Use a dict comprehension: "{}", "{x: x ** 2 for x in range(10)}"
* Use the type constructor: "dict()", "dict([('foo', 100), ('bar',
200)])", "dict(foo=100, bar=200)"
If no positional argument is given, an empty dictionary is created.
If a positional argument is given and it is a mapping object, a
dictionary is created with the same key-value pairs as the mapping
object. Otherwise, the positional argument must be an *iterable*
object. Each item in the iterable must itself be an iterable with
exactly two objects. The first object of each item becomes a key
in the new dictionary, and the second object the corresponding
value. If a key occurs more than once, the last value for that key
becomes the corresponding value in the new dictionary.
If keyword arguments are given, the keyword arguments and their
values are added to the dictionary created from the positional
argument. If a key being added is already present, the value from
the keyword argument replaces the value from the positional
argument.
To illustrate, the following examples all return a dictionary equal
to "{"one": 1, "two": 2, "three": 3}":
>>> a = dict(one=1, two=2, three=3)
>>> b = {'one': 1, 'two': 2, 'three': 3}
>>> c = dict(zip(['one', 'two', 'three'], [1, 2, 3]))
>>> d = dict([('two', 2), ('one', 1), ('three', 3)])
>>> e = dict({'three': 3, 'one': 1, 'two': 2})
>>> a == b == c == d == e
True
Providing keyword arguments as in the first example only works for
keys that are valid Python identifiers. Otherwise, any valid keys
can be used.
These are the operations that dictionaries support (and therefore,
custom mapping types should support too):
list(d)
Return a list of all the keys used in the dictionary *d*.
len(d)
Return the number of items in the dictionary *d*.
d[key]
Return the item of *d* with key *key*. Raises a "KeyError" if
*key* is not in the map.
If a subclass of dict defines a method "__missing__()" and *key*
is not present, the "d[key]" operation calls that method with
the key *key* as argument. The "d[key]" operation then returns
or raises whatever is returned or raised by the
"__missing__(key)" call. No other operations or methods invoke
"__missing__()". If "__missing__()" is not defined, "KeyError"
is raised. "__missing__()" must be a method; it cannot be an
instance variable:
>>> class Counter(dict):
... def __missing__(self, key):
... return 0
>>> c = Counter()
>>> c['red']
0
>>> c['red'] += 1
>>> c['red']
1
The example above shows part of the implementation of
"collections.Counter". A different "__missing__" method is used
by "collections.defaultdict".
d[key] = value
Set "d[key]" to *value*.
del d[key]
Remove "d[key]" from *d*. Raises a "KeyError" if *key* is not
in the map.
key in d
Return "True" if *d* has a key *key*, else "False".
key not in d
Equivalent to "not key in d".
iter(d)
Return an iterator over the keys of the dictionary. This is a
shortcut for "iter(d.keys())".
clear()
Remove all items from the dictionary.
copy()
Return a shallow copy of the dictionary.
classmethod fromkeys(iterable[, value])
Create a new dictionary with keys from *iterable* and values set
to *value*.
"fromkeys()" is a class method that returns a new dictionary.
*value* defaults to "None". All of the values refer to just a
single instance, so it generally doesn’t make sense for *value*
to be a mutable object such as an empty list. To get distinct
values, use a dict comprehension instead.
get(key[, default])
Return the value for *key* if *key* is in the dictionary, else
*default*. If *default* is not given, it defaults to "None", so
that this method never raises a "KeyError".
items()
Return a new view of the dictionary’s items ("(key, value)"
pairs). See the documentation of view objects.
keys()
Return a new view of the dictionary’s keys. See the
documentation of view objects.
pop(key[, default])
If *key* is in the dictionary, remove it and return its value,
else return *default*. If *default* is not given and *key* is
not in the dictionary, a "KeyError" is raised.
popitem()
Remove and return a "(key, value)" pair from the dictionary.
Pairs are returned in LIFO (last-in, first-out) order.
"popitem()" is useful to destructively iterate over a
dictionary, as often used in set algorithms. If the dictionary
is empty, calling "popitem()" raises a "KeyError".
Changed in version 3.7: LIFO order is now guaranteed. In prior
versions, "popitem()" would return an arbitrary key/value pair.
reversed(d)
Return a reverse iterator over the keys of the dictionary. This
is a shortcut for "reversed(d.keys())".
New in version 3.8.
setdefault(key[, default])
If *key* is in the dictionary, return its value. If not, insert
*key* with a value of *default* and return *default*. *default*
defaults to "None".
update([other])
Update the dictionary with the key/value pairs from *other*,
overwriting existing keys. Return "None".
"update()" accepts either another dictionary object or an
iterable of key/value pairs (as tuples or other iterables of
length two). If keyword arguments are specified, the dictionary
is then updated with those key/value pairs: "d.update(red=1,
blue=2)".
values()
Return a new view of the dictionary’s values. See the
documentation of view objects.
An equality comparison between one "dict.values()" view and
another will always return "False". This also applies when
comparing "dict.values()" to itself:
>>> d = {'a': 1}
>>> d.values() == d.values()
False
Dictionaries compare equal if and only if they have the same "(key,
value)" pairs (regardless of ordering). Order comparisons (‘<’,
‘<=’, ‘>=’, ‘>’) raise "TypeError".
Dictionaries preserve insertion order. Note that updating a key
does not affect the order. Keys added after deletion are inserted
at the end.
>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> d
{'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> list(d)
['one', 'two', 'three', 'four']
>>> list(d.values())
[1, 2, 3, 4]
>>> d["one"] = 42
>>> d
{'one': 42, 'two': 2, 'three': 3, 'four': 4}
>>> del d["two"]
>>> d["two"] = None
>>> d
{'one': 42, 'three': 3, 'four': 4, 'two': None}
Changed in version 3.7: Dictionary order is guaranteed to be
insertion order. This behavior was an implementation detail of
CPython from 3.6.
Dictionaries and dictionary views are reversible.
>>> d = {"one": 1, "two": 2, "three": 3, "four": 4}
>>> d
{'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> list(reversed(d))
['four', 'three', 'two', 'one']
>>> list(reversed(d.values()))
[4, 3, 2, 1]
>>> list(reversed(d.items()))
[('four', 4), ('three', 3), ('two', 2), ('one', 1)]
Changed in version 3.8: Dictionaries are now reversible.
See also:
"types.MappingProxyType" can be used to create a read-only view of a
"dict".
Dictionary view objects
=======================
The objects returned by "dict.keys()", "dict.values()" and
"dict.items()" are *view objects*. They provide a dynamic view on the
dictionary’s entries, which means that when the dictionary changes,
the view reflects these changes.
Dictionary views can be iterated over to yield their respective data,
and support membership tests:
len(dictview)
Return the number of entries in the dictionary.
iter(dictview)
Return an iterator over the keys, values or items (represented as
tuples of "(key, value)") in the dictionary.
Keys and values are iterated over in insertion order. This allows
the creation of "(value, key)" pairs using "zip()": "pairs =
zip(d.values(), d.keys())". Another way to create the same list is
"pairs = [(v, k) for (k, v) in d.items()]".
Iterating views while adding or deleting entries in the dictionary
may raise a "RuntimeError" or fail to iterate over all entries.
Changed in version 3.7: Dictionary order is guaranteed to be
insertion order.
x in dictview
Return "True" if *x* is in the underlying dictionary’s keys, values
or items (in the latter case, *x* should be a "(key, value)"
tuple).
reversed(dictview)
Return a reverse iterator over the keys, values or items of the
dictionary. The view will be iterated in reverse order of the
insertion.
Changed in version 3.8: Dictionary views are now reversible.
Keys views are set-like since their entries are unique and hashable.
If all values are hashable, so that "(key, value)" pairs are unique
and hashable, then the items view is also set-like. (Values views are
not treated as set-like since the entries are generally not unique.)
For set-like views, all of the operations defined for the abstract
base class "collections.abc.Set" are available (for example, "==",
"<", or "^").
An example of dictionary view usage:
>>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500}
>>> keys = dishes.keys()
>>> values = dishes.values()
>>> # iteration
>>> n = 0
>>> for val in values:
... n += val
>>> print(n)
504
>>> # keys and values are iterated over in the same order (insertion order)
>>> list(keys)
['eggs', 'sausage', 'bacon', 'spam']
>>> list(values)
[2, 1, 1, 500]
>>> # view objects are dynamic and reflect dict changes
>>> del dishes['eggs']
>>> del dishes['sausage']
>>> list(keys)
['bacon', 'spam']
>>> # set operations
>>> keys & {'eggs', 'bacon', 'salad'}
{'bacon'}
>>> keys ^ {'sausage', 'juice'}
{'juice', 'sausage', 'bacon', 'spam'}
a� Methods
*******
Methods are functions that are called using the attribute notation.
There are two flavors: built-in methods (such as "append()" on lists)
and class instance methods. Built-in methods are described with the
types that support them.
If you access a method (a function defined in a class namespace)
through an instance, you get a special object: a *bound method* (also
called *instance method*) object. When called, it will add the "self"
argument to the argument list. Bound methods have two special read-
only attributes: "m.__self__" is the object on which the method
operates, and "m.__func__" is the function implementing the method.
Calling "m(arg-1, arg-2, ..., arg-n)" is completely equivalent to
calling "m.__func__(m.__self__, arg-1, arg-2, ..., arg-n)".
Like function objects, bound method objects support getting arbitrary
attributes. However, since method attributes are actually stored on
the underlying function object ("meth.__func__"), setting method
attributes on bound methods is disallowed. Attempting to set an
attribute on a method results in an "AttributeError" being raised. In
order to set a method attribute, you need to explicitly set it on the
underlying function object:
>>> class C:
... def method(self):
... pass
...
>>> c = C()
>>> c.method.whoami = 'my name is method' # can't set on the method
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'method' object has no attribute 'whoami'
>>> c.method.__func__.whoami = 'my name is method'
>>> c.method.whoami
'my name is method'
See The standard type hierarchy for more information.
u$ Modules
*******
The only special operation on a module is attribute access: "m.name",
where *m* is a module and *name* accesses a name defined in *m*’s
symbol table. Module attributes can be assigned to. (Note that the
"import" statement is not, strictly speaking, an operation on a module
object; "import foo" does not require a module object named *foo* to
exist, rather it requires an (external) *definition* for a module
named *foo* somewhere.)
A special attribute of every module is "__dict__". This is the
dictionary containing the module’s symbol table. Modifying this
dictionary will actually change the module’s symbol table, but direct
assignment to the "__dict__" attribute is not possible (you can write
"m.__dict__['a'] = 1", which defines "m.a" to be "1", but you can’t
write "m.__dict__ = {}"). Modifying "__dict__" directly is not
recommended.
Modules built into the interpreter are written like this: "<module
'sys' (built-in)>". If loaded from a file, they are written as
"<module 'os' from '/usr/local/lib/pythonX.Y/os.pyc'>".
u�Z Sequence Types — "list", "tuple", "range"
*****************************************
There are three basic sequence types: lists, tuples, and range
objects. Additional sequence types tailored for processing of binary
data and text strings are described in dedicated sections.
Common Sequence Operations
==========================
The operations in the following table are supported by most sequence
types, both mutable and immutable. The "collections.abc.Sequence" ABC
is provided to make it easier to correctly implement these operations
on custom sequence types.
This table lists the sequence operations sorted in ascending priority.
In the table, *s* and *t* are sequences of the same type, *n*, *i*,
*j* and *k* are integers and *x* is an arbitrary object that meets any
type and value restrictions imposed by *s*.
The "in" and "not in" operations have the same priorities as the
comparison operations. The "+" (concatenation) and "*" (repetition)
operations have the same priority as the corresponding numeric
operations. [3]
+----------------------------+----------------------------------+------------+
| Operation | Result | Notes |
|============================|==================================|============|
| "x in s" | "True" if an item of *s* is | (1) |
| | equal to *x*, else "False" | |
+----------------------------+----------------------------------+------------+
| "x not in s" | "False" if an item of *s* is | (1) |
| | equal to *x*, else "True" | |
+----------------------------+----------------------------------+------------+
| "s + t" | the concatenation of *s* and *t* | (6)(7) |
+----------------------------+----------------------------------+------------+
| "s * n" or "n * s" | equivalent to adding *s* to | (2)(7) |
| | itself *n* times | |
+----------------------------+----------------------------------+------------+
| "s[i]" | *i*th item of *s*, origin 0 | (3) |
+----------------------------+----------------------------------+------------+
| "s[i:j]" | slice of *s* from *i* to *j* | (3)(4) |
+----------------------------+----------------------------------+------------+
| "s[i:j:k]" | slice of *s* from *i* to *j* | (3)(5) |
| | with step *k* | |
+----------------------------+----------------------------------+------------+
| "len(s)" | length of *s* | |
+----------------------------+----------------------------------+------------+
| "min(s)" | smallest item of *s* | |
+----------------------------+----------------------------------+------------+
| "max(s)" | largest item of *s* | |
+----------------------------+----------------------------------+------------+
| "s.index(x[, i[, j]])" | index of the first occurrence of | (8) |
| | *x* in *s* (at or after index | |
| | *i* and before index *j*) | |
+----------------------------+----------------------------------+------------+
| "s.count(x)" | total number of occurrences of | |
| | *x* in *s* | |
+----------------------------+----------------------------------+------------+
Sequences of the same type also support comparisons. In particular,
tuples and lists are compared lexicographically by comparing
corresponding elements. This means that to compare equal, every
element must compare equal and the two sequences must be of the same
type and have the same length. (For full details see Comparisons in
the language reference.)
Notes:
1. While the "in" and "not in" operations are used only for simple
containment testing in the general case, some specialised sequences
(such as "str", "bytes" and "bytearray") also use them for
subsequence testing:
>>> "gg" in "eggs"
True
2. Values of *n* less than "0" are treated as "0" (which yields an
empty sequence of the same type as *s*). Note that items in the
sequence *s* are not copied; they are referenced multiple times.
This often haunts new Python programmers; consider:
>>> lists = [[]] * 3
>>> lists
[[], [], []]
>>> lists[0].append(3)
>>> lists
[[3], [3], [3]]
What has happened is that "[[]]" is a one-element list containing
an empty list, so all three elements of "[[]] * 3" are references
to this single empty list. Modifying any of the elements of
"lists" modifies this single list. You can create a list of
different lists this way:
>>> lists = [[] for i in range(3)]
>>> lists[0].append(3)
>>> lists[1].append(5)
>>> lists[2].append(7)
>>> lists
[[3], [5], [7]]
Further explanation is available in the FAQ entry How do I create a
multidimensional list?.
3. If *i* or *j* is negative, the index is relative to the end of
sequence *s*: "len(s) + i" or "len(s) + j" is substituted. But
note that "-0" is still "0".
4. The slice of *s* from *i* to *j* is defined as the sequence of
items with index *k* such that "i <= k < j". If *i* or *j* is
greater than "len(s)", use "len(s)". If *i* is omitted or "None",
use "0". If *j* is omitted or "None", use "len(s)". If *i* is
greater than or equal to *j*, the slice is empty.
5. The slice of *s* from *i* to *j* with step *k* is defined as the
sequence of items with index "x = i + n*k" such that "0 <= n <
(j-i)/k". In other words, the indices are "i", "i+k", "i+2*k",
"i+3*k" and so on, stopping when *j* is reached (but never
including *j*). When *k* is positive, *i* and *j* are reduced to
"len(s)" if they are greater. When *k* is negative, *i* and *j* are
reduced to "len(s) - 1" if they are greater. If *i* or *j* are
omitted or "None", they become “end” values (which end depends on
the sign of *k*). Note, *k* cannot be zero. If *k* is "None", it
is treated like "1".
6. Concatenating immutable sequences always results in a new object.
This means that building up a sequence by repeated concatenation
will have a quadratic runtime cost in the total sequence length.
To get a linear runtime cost, you must switch to one of the
alternatives below:
* if concatenating "str" objects, you can build a list and use
"str.join()" at the end or else write to an "io.StringIO"
instance and retrieve its value when complete
* if concatenating "bytes" objects, you can similarly use
"bytes.join()" or "io.BytesIO", or you can do in-place
concatenation with a "bytearray" object. "bytearray" objects are
mutable and have an efficient overallocation mechanism
* if concatenating "tuple" objects, extend a "list" instead
* for other types, investigate the relevant class documentation
7. Some sequence types (such as "range") only support item sequences
that follow specific patterns, and hence don’t support sequence
concatenation or repetition.
8. "index" raises "ValueError" when *x* is not found in *s*. Not all
implementations support passing the additional arguments *i* and
*j*. These arguments allow efficient searching of subsections of
the sequence. Passing the extra arguments is roughly equivalent to
using "s[i:j].index(x)", only without copying any data and with the
returned index being relative to the start of the sequence rather
than the start of the slice.
Immutable Sequence Types
========================
The only operation that immutable sequence types generally implement
that is not also implemented by mutable sequence types is support for
the "hash()" built-in.
This support allows immutable sequences, such as "tuple" instances, to
be used as "dict" keys and stored in "set" and "frozenset" instances.
Attempting to hash an immutable sequence that contains unhashable
values will result in "TypeError".
Mutable Sequence Types
======================
The operations in the following table are defined on mutable sequence
types. The "collections.abc.MutableSequence" ABC is provided to make
it easier to correctly implement these operations on custom sequence
types.
In the table *s* is an instance of a mutable sequence type, *t* is any
iterable object and *x* is an arbitrary object that meets any type and
value restrictions imposed by *s* (for example, "bytearray" only
accepts integers that meet the value restriction "0 <= x <= 255").
+--------------------------------+----------------------------------+-----------------------+
| Operation | Result | Notes |
|================================|==================================|=======================|
| "s[i] = x" | item *i* of *s* is replaced by | |
| | *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j] = t" | slice of *s* from *i* to *j* is | |
| | replaced by the contents of the | |
| | iterable *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j]" | same as "s[i:j] = []" | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j:k] = t" | the elements of "s[i:j:k]" are | (1) |
| | replaced by those of *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j:k]" | removes the elements of | |
| | "s[i:j:k]" from the list | |
+--------------------------------+----------------------------------+-----------------------+
| "s.append(x)" | appends *x* to the end of the | |
| | sequence (same as | |
| | "s[len(s):len(s)] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.clear()" | removes all items from *s* (same | (5) |
| | as "del s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.copy()" | creates a shallow copy of *s* | (5) |
| | (same as "s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.extend(t)" or "s += t" | extends *s* with the contents of | |
| | *t* (for the most part the same | |
| | as "s[len(s):len(s)] = t") | |
+--------------------------------+----------------------------------+-----------------------+
| "s *= n" | updates *s* with its contents | (6) |
| | repeated *n* times | |
+--------------------------------+----------------------------------+-----------------------+
| "s.insert(i, x)" | inserts *x* into *s* at the | |
| | index given by *i* (same as | |
| | "s[i:i] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.pop()" or "s.pop(i)" | retrieves the item at *i* and | (2) |
| | also removes it from *s* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.remove(x)" | remove the first item from *s* | (3) |
| | where "s[i]" is equal to *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.reverse()" | reverses the items of *s* in | (4) |
| | place | |
+--------------------------------+----------------------------------+-----------------------+
Notes:
1. *t* must have the same length as the slice it is replacing.
2. The optional argument *i* defaults to "-1", so that by default the
last item is removed and returned.
3. "remove()" raises "ValueError" when *x* is not found in *s*.
4. The "reverse()" method modifies the sequence in place for economy
of space when reversing a large sequence. To remind users that it
operates by side effect, it does not return the reversed sequence.
5. "clear()" and "copy()" are included for consistency with the
interfaces of mutable containers that don’t support slicing
operations (such as "dict" and "set"). "copy()" is not part of the
"collections.abc.MutableSequence" ABC, but most concrete mutable
sequence classes provide it.
New in version 3.3: "clear()" and "copy()" methods.
6. The value *n* is an integer, or an object implementing
"__index__()". Zero and negative values of *n* clear the sequence.
Items in the sequence are not copied; they are referenced multiple
times, as explained for "s * n" under Common Sequence Operations.
Lists
=====
Lists are mutable sequences, typically used to store collections of
homogeneous items (where the precise degree of similarity will vary by
application).
class list([iterable])
Lists may be constructed in several ways:
* Using a pair of square brackets to denote the empty list: "[]"
* Using square brackets, separating items with commas: "[a]", "[a,
b, c]"
* Using a list comprehension: "[x for x in iterable]"
* Using the type constructor: "list()" or "list(iterable)"
The constructor builds a list whose items are the same and in the
same order as *iterable*’s items. *iterable* may be either a
sequence, a container that supports iteration, or an iterator
object. If *iterable* is already a list, a copy is made and
returned, similar to "iterable[:]". For example, "list('abc')"
returns "['a', 'b', 'c']" and "list( (1, 2, 3) )" returns "[1, 2,
3]". If no argument is given, the constructor creates a new empty
list, "[]".
Many other operations also produce lists, including the "sorted()"
built-in.
Lists implement all of the common and mutable sequence operations.
Lists also provide the following additional method:
sort(*, key=None, reverse=False)
This method sorts the list in place, using only "<" comparisons
between items. Exceptions are not suppressed - if any comparison
operations fail, the entire sort operation will fail (and the
list will likely be left in a partially modified state).
"sort()" accepts two arguments that can only be passed by
keyword (keyword-only arguments):
*key* specifies a function of one argument that is used to
extract a comparison key from each list element (for example,
"key=str.lower"). The key corresponding to each item in the list
is calculated once and then used for the entire sorting process.
The default value of "None" means that list items are sorted
directly without calculating a separate key value.
The "functools.cmp_to_key()" utility is available to convert a
2.x style *cmp* function to a *key* function.
*reverse* is a boolean value. If set to "True", then the list
elements are sorted as if each comparison were reversed.
This method modifies the sequence in place for economy of space
when sorting a large sequence. To remind users that it operates
by side effect, it does not return the sorted sequence (use
"sorted()" to explicitly request a new sorted list instance).
The "sort()" method is guaranteed to be stable. A sort is
stable if it guarantees not to change the relative order of
elements that compare equal — this is helpful for sorting in
multiple passes (for example, sort by department, then by salary
grade).
For sorting examples and a brief sorting tutorial, see Sorting
HOW TO.
**CPython implementation detail:** While a list is being sorted,
the effect of attempting to mutate, or even inspect, the list is
undefined. The C implementation of Python makes the list appear
empty for the duration, and raises "ValueError" if it can detect
that the list has been mutated during a sort.
Tuples
======
Tuples are immutable sequences, typically used to store collections of
heterogeneous data (such as the 2-tuples produced by the "enumerate()"
built-in). Tuples are also used for cases where an immutable sequence
of homogeneous data is needed (such as allowing storage in a "set" or
"dict" instance).
class tuple([iterable])
Tuples may be constructed in a number of ways:
* Using a pair of parentheses to denote the empty tuple: "()"
* Using a trailing comma for a singleton tuple: "a," or "(a,)"
* Separating items with commas: "a, b, c" or "(a, b, c)"
* Using the "tuple()" built-in: "tuple()" or "tuple(iterable)"
The constructor builds a tuple whose items are the same and in the
same order as *iterable*’s items. *iterable* may be either a
sequence, a container that supports iteration, or an iterator
object. If *iterable* is already a tuple, it is returned
unchanged. For example, "tuple('abc')" returns "('a', 'b', 'c')"
and "tuple( [1, 2, 3] )" returns "(1, 2, 3)". If no argument is
given, the constructor creates a new empty tuple, "()".
Note that it is actually the comma which makes a tuple, not the
parentheses. The parentheses are optional, except in the empty
tuple case, or when they are needed to avoid syntactic ambiguity.
For example, "f(a, b, c)" is a function call with three arguments,
while "f((a, b, c))" is a function call with a 3-tuple as the sole
argument.
Tuples implement all of the common sequence operations.
For heterogeneous collections of data where access by name is clearer
than access by index, "collections.namedtuple()" may be a more
appropriate choice than a simple tuple object.
Ranges
======
The "range" type represents an immutable sequence of numbers and is
commonly used for looping a specific number of times in "for" loops.
class range(stop)
class range(start, stop[, step])
The arguments to the range constructor must be integers (either
built-in "int" or any object that implements the "__index__"
special method). If the *step* argument is omitted, it defaults to
"1". If the *start* argument is omitted, it defaults to "0". If
*step* is zero, "ValueError" is raised.
For a positive *step*, the contents of a range "r" are determined
by the formula "r[i] = start + step*i" where "i >= 0" and "r[i] <
stop".
For a negative *step*, the contents of the range are still
determined by the formula "r[i] = start + step*i", but the
constraints are "i >= 0" and "r[i] > stop".
A range object will be empty if "r[0]" does not meet the value
constraint. Ranges do support negative indices, but these are
interpreted as indexing from the end of the sequence determined by
the positive indices.
Ranges containing absolute values larger than "sys.maxsize" are
permitted but some features (such as "len()") may raise
"OverflowError".
Range examples:
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> list(range(1, 11))
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> list(range(0, 30, 5))
[0, 5, 10, 15, 20, 25]
>>> list(range(0, 10, 3))
[0, 3, 6, 9]
>>> list(range(0, -10, -1))
[0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
>>> list(range(0))
[]
>>> list(range(1, 0))
[]
Ranges implement all of the common sequence operations except
concatenation and repetition (due to the fact that range objects
can only represent sequences that follow a strict pattern and
repetition and concatenation will usually violate that pattern).
start
The value of the *start* parameter (or "0" if the parameter was
not supplied)
stop
The value of the *stop* parameter
step
The value of the *step* parameter (or "1" if the parameter was
not supplied)
The advantage of the "range" type over a regular "list" or "tuple" is
that a "range" object will always take the same (small) amount of
memory, no matter the size of the range it represents (as it only
stores the "start", "stop" and "step" values, calculating individual
items and subranges as needed).
Range objects implement the "collections.abc.Sequence" ABC, and
provide features such as containment tests, element index lookup,
slicing and support for negative indices (see Sequence Types — list,
tuple, range):
>>> r = range(0, 20, 2)
>>> r
range(0, 20, 2)
>>> 11 in r
False
>>> 10 in r
True
>>> r.index(10)
5
>>> r[5]
10
>>> r[:5]
range(0, 10, 2)
>>> r[-1]
18
Testing range objects for equality with "==" and "!=" compares them as
sequences. That is, two range objects are considered equal if they
represent the same sequence of values. (Note that two range objects
that compare equal might have different "start", "stop" and "step"
attributes, for example "range(0) == range(2, 1, 3)" or "range(0, 3,
2) == range(0, 4, 2)".)
Changed in version 3.2: Implement the Sequence ABC. Support slicing
and negative indices. Test "int" objects for membership in constant
time instead of iterating through all items.
Changed in version 3.3: Define ‘==’ and ‘!=’ to compare range objects
based on the sequence of values they define (instead of comparing
based on object identity).
New in version 3.3: The "start", "stop" and "step" attributes.
See also:
* The linspace recipe shows how to implement a lazy version of range
suitable for floating point applications.
u� Mutable Sequence Types
**********************
The operations in the following table are defined on mutable sequence
types. The "collections.abc.MutableSequence" ABC is provided to make
it easier to correctly implement these operations on custom sequence
types.
In the table *s* is an instance of a mutable sequence type, *t* is any
iterable object and *x* is an arbitrary object that meets any type and
value restrictions imposed by *s* (for example, "bytearray" only
accepts integers that meet the value restriction "0 <= x <= 255").
+--------------------------------+----------------------------------+-----------------------+
| Operation | Result | Notes |
|================================|==================================|=======================|
| "s[i] = x" | item *i* of *s* is replaced by | |
| | *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j] = t" | slice of *s* from *i* to *j* is | |
| | replaced by the contents of the | |
| | iterable *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j]" | same as "s[i:j] = []" | |
+--------------------------------+----------------------------------+-----------------------+
| "s[i:j:k] = t" | the elements of "s[i:j:k]" are | (1) |
| | replaced by those of *t* | |
+--------------------------------+----------------------------------+-----------------------+
| "del s[i:j:k]" | removes the elements of | |
| | "s[i:j:k]" from the list | |
+--------------------------------+----------------------------------+-----------------------+
| "s.append(x)" | appends *x* to the end of the | |
| | sequence (same as | |
| | "s[len(s):len(s)] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.clear()" | removes all items from *s* (same | (5) |
| | as "del s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.copy()" | creates a shallow copy of *s* | (5) |
| | (same as "s[:]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.extend(t)" or "s += t" | extends *s* with the contents of | |
| | *t* (for the most part the same | |
| | as "s[len(s):len(s)] = t") | |
+--------------------------------+----------------------------------+-----------------------+
| "s *= n" | updates *s* with its contents | (6) |
| | repeated *n* times | |
+--------------------------------+----------------------------------+-----------------------+
| "s.insert(i, x)" | inserts *x* into *s* at the | |
| | index given by *i* (same as | |
| | "s[i:i] = [x]") | |
+--------------------------------+----------------------------------+-----------------------+
| "s.pop()" or "s.pop(i)" | retrieves the item at *i* and | (2) |
| | also removes it from *s* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.remove(x)" | remove the first item from *s* | (3) |
| | where "s[i]" is equal to *x* | |
+--------------------------------+----------------------------------+-----------------------+
| "s.reverse()" | reverses the items of *s* in | (4) |
| | place | |
+--------------------------------+----------------------------------+-----------------------+
Notes:
1. *t* must have the same length as the slice it is replacing.
2. The optional argument *i* defaults to "-1", so that by default the
last item is removed and returned.
3. "remove()" raises "ValueError" when *x* is not found in *s*.
4. The "reverse()" method modifies the sequence in place for economy
of space when reversing a large sequence. To remind users that it
operates by side effect, it does not return the reversed sequence.
5. "clear()" and "copy()" are included for consistency with the
interfaces of mutable containers that don’t support slicing
operations (such as "dict" and "set"). "copy()" is not part of the
"collections.abc.MutableSequence" ABC, but most concrete mutable
sequence classes provide it.
New in version 3.3: "clear()" and "copy()" methods.
6. The value *n* is an integer, or an object implementing
"__index__()". Zero and negative values of *n* clear the sequence.
Items in the sequence are not copied; they are referenced multiple
times, as explained for "s * n" under Common Sequence Operations.
a~ Unary arithmetic and bitwise operations
***************************************
All unary arithmetic and bitwise operations have the same priority:
u_expr ::= power | "-" u_expr | "+" u_expr | "~" u_expr
The unary "-" (minus) operator yields the negation of its numeric
argument.
The unary "+" (plus) operator yields its numeric argument unchanged.
The unary "~" (invert) operator yields the bitwise inversion of its
integer argument. The bitwise inversion of "x" is defined as
"-(x+1)". It only applies to integral numbers.
In all three cases, if the argument does not have the proper type, a
"TypeError" exception is raised.
u� The "while" statement
*********************
The "while" statement is used for repeated execution as long as an
expression is true:
while_stmt ::= "while" assignment_expression ":" suite
["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the
first suite; if the expression is false (which may be the first time
it is tested) the suite of the "else" clause, if present, is executed
and the loop terminates.
A "break" statement executed in the first suite terminates the loop
without executing the "else" clause’s suite. A "continue" statement
executed in the first suite skips the rest of the suite and goes back
to testing the expression.
uM The "with" statement
********************
The "with" statement is used to wrap the execution of a block with
methods defined by a context manager (see section With Statement
Context Managers). This allows common "try"…"except"…"finally" usage
patterns to be encapsulated for convenient reuse.
with_stmt ::= "with" with_item ("," with_item)* ":" suite
with_item ::= expression ["as" target]
The execution of the "with" statement with one “item” proceeds as
follows:
1. The context expression (the expression given in the "with_item") is
evaluated to obtain a context manager.
2. The context manager’s "__enter__()" is loaded for later use.
3. The context manager’s "__exit__()" is loaded for later use.
4. The context manager’s "__enter__()" method is invoked.
5. If a target was included in the "with" statement, the return value
from "__enter__()" is assigned to it.
Note:
The "with" statement guarantees that if the "__enter__()" method
returns without an error, then "__exit__()" will always be
called. Thus, if an error occurs during the assignment to the
target list, it will be treated the same as an error occurring
within the suite would be. See step 6 below.
6. The suite is executed.
7. The context manager’s "__exit__()" method is invoked. If an
exception caused the suite to be exited, its type, value, and
traceback are passed as arguments to "__exit__()". Otherwise, three
"None" arguments are supplied.
If the suite was exited due to an exception, and the return value
from the "__exit__()" method was false, the exception is reraised.
If the return value was true, the exception is suppressed, and
execution continues with the statement following the "with"
statement.
If the suite was exited for any reason other than an exception, the
return value from "__exit__()" is ignored, and execution proceeds
at the normal location for the kind of exit that was taken.
The following code:
with EXPRESSION as TARGET:
SUITE
is semantically equivalent to:
manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
hit_except = False
try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
With more than one item, the context managers are processed as if
multiple "with" statements were nested:
with A() as a, B() as b:
SUITE
is semantically equivalent to:
with A() as a:
with B() as b:
SUITE
Changed in version 3.1: Support for multiple context expressions.
See also:
**PEP 343** - The “with” statement
The specification, background, and examples for the Python "with"
statement.
a, The "yield" statement
*********************
yield_stmt ::= yield_expression
A "yield" statement is semantically equivalent to a yield expression.
The yield statement can be used to omit the parentheses that would
otherwise be required in the equivalent yield expression statement.
For example, the yield statements
yield <expr>
yield from <expr>
are equivalent to the yield expression statements
(yield <expr>)
(yield from <expr>)
Yield expressions and statements are only used when defining a
*generator* function, and are only used in the body of the generator
function. Using yield in a function definition is sufficient to cause
that definition to create a generator function instead of a normal
function.
For full details of "yield" semantics, refer to the Yield expressions
section.
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HTTPHandler performs HTTP GET and POST requests and deals with
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HTTP 301, 302, 303 and 307 redirect errors, and the HTTPDigestAuthHandler
deals with digest authentication.
urlopen(url, data=None) -- Basic usage is the same as original
urllib. pass the url and optionally data to post to an HTTP URL, and
get a file-like object back. One difference is that you can also pass
a Request instance instead of URL. Raises a URLError (subclass of
OSError); for HTTP errors, raises an HTTPError, which can also be
treated as a valid response.
build_opener -- Function that creates a new OpenerDirector instance.
Will install the default handlers. Accepts one or more Handlers as
arguments, either instances or Handler classes that it will
instantiate. If one of the argument is a subclass of the default
handler, the argument will be installed instead of the default.
install_opener -- Installs a new opener as the default opener.
objects of interest:
OpenerDirector -- Sets up the User Agent as the Python-urllib client and manages
the Handler classes, while dealing with requests and responses.
Request -- An object that encapsulates the state of a request. The
state can be as simple as the URL. It can also include extra HTTP
headers, e.g. a User-Agent.
BaseHandler --
internals:
BaseHandler and parent
_call_chain conventions
Example usage:
import urllib.request
# set up authentication info
authinfo = urllib.request.HTTPBasicAuthHandler()
authinfo.add_password(realm='PDQ Application',
uri='https://mahler:8092/site-updates.py',
user='klem',
passwd='geheim$parole')
proxy_support = urllib.request.ProxyHandler({"http" : "http://ahad-haam:3128"})
# build a new opener that adds authentication and caching FTP handlers
opener = urllib.request.build_opener(proxy_support, authinfo,
urllib.request.CacheFTPHandler)
# install it
urllib.request.install_opener(opener)
f = urllib.request.urlopen('http://www.python.org/')
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RFC 3986 (STD66): "Uniform Resource Identifiers" by T. Berners-Lee, R. Fielding
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RFC 2732 : "Format for Literal IPv6 Addresses in URL's by R.Hinden, B.Carpenter
and L.Masinter, December 1999.
RFC 2396: "Uniform Resource Identifiers (URI)": Generic Syntax by T.
Berners-Lee, R. Fielding, and L. Masinter, August 1998.
RFC 2368: "The mailto URL scheme", by P.Hoffman , L Masinter, J. Zawinski, July 1998.
RFC 1808: "Relative Uniform Resource Locators", by R. Fielding, UC Irvine, June
1995.
RFC 1738: "Uniform Resource Locators (URL)" by T. Berners-Lee, L. Masinter, M.
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parsing quirks from older RFCs are retained. The testcases in
test_urlparse.py provides a good indicator of parsing behavior.
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urlparse module is based upon the following RFC specifications.
RFC 3986 (STD66): "Uniform Resource Identifiers" by T. Berners-Lee, R. Fielding
and L. Masinter, January 2005.
RFC 2732 : "Format for Literal IPv6 Addresses in URL's by R.Hinden, B.Carpenter
and L.Masinter, December 1999.
RFC 2396: "Uniform Resource Identifiers (URI)": Generic Syntax by T.
Berners-Lee, R. Fielding, and L. Masinter, August 1998.
RFC 2368: "The mailto URL scheme", by P.Hoffman , L Masinter, J. Zawinski, July 1998.
RFC 1808: "Relative Uniform Resource Locators", by R. Fielding, UC Irvine, June
1995.
RFC 1738: "Uniform Resource Locators (URL)" by T. Berners-Lee, L. Masinter, M.
McCahill, December 1994
RFC 3986 is considered the current standard and any future changes to
urlparse module should conform with it. The urlparse module is
currently not entirely compliant with this RFC due to defacto
scenarios for parsing, and for backward compatibility purposes, some
parsing quirks from older RFCs are retained. The testcases in
test_urlparse.py provides a good indicator of parsing behavior.
The WHATWG URL Parser spec should also be considered. We are not compliant with
it either due to existing user code API behavior expectations (Hyrum's Law).
It serves as a useful guide when making changes.
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