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# SOME DESCRIPTIVE TITLE.
# Copyright (C) 2001-2017, Python Software Foundation
# This file is distributed under the same license as the Python package.
# FIRST AUTHOR <EMAIL@ADDRESS>, 2017.
"Project-Id-Version: Python 3.6\n"
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"POT-Creation-Date: 2018-05-26 11:10+0900\n"
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#: ../Doc/library/abc.rst:2
msgid ":mod:`abc` --- Abstract Base Classes"
#: ../Doc/library/abc.rst:11
msgid "**Source code:** :source:`Lib/abc.py`"
#: ../Doc/library/abc.rst:15
"This module provides the infrastructure for defining :term:`abstract base"
" classes <abstract base class>` (ABCs) in Python, as outlined in "
":pep:`3119`; see the PEP for why this was added to Python. (See also "
":pep:`3141` and the :mod:`numbers` module regarding a type hierarchy for "
"numbers based on ABCs.)"
#: ../Doc/library/abc.rst:20
"The :mod:`collections` module has some concrete classes that derive from "
"ABCs; these can, of course, be further derived. In addition the "
":mod:`collections.abc` submodule has some ABCs that can be used to test "
"whether a class or instance provides a particular interface, for example,"
" is it hashable or a mapping."
#: ../Doc/library/abc.rst:27
"This module provides the metaclass :class:`ABCMeta` for defining ABCs and"
" a helper class :class:`ABC` to alternatively define ABCs through "
"inheritance:"
#: ../Doc/library/abc.rst:32
"A helper class that has :class:`ABCMeta` as its metaclass.  With this "
"class, an abstract base class can be created by simply deriving from "
":class:`ABC` avoiding sometimes confusing metaclass usage, for example::"
#: ../Doc/library/abc.rst:41
"Note that the type of :class:`ABC` is still :class:`ABCMeta`, therefore "
"inheriting from :class:`ABC` requires the usual precautions regarding "
"metaclass usage, as multiple inheritance may lead to metaclass conflicts."
" One may also define an abstract base class by passing the metaclass "
"keyword and using :class:`ABCMeta` directly, for example::"
#: ../Doc/library/abc.rst:57
msgid "Metaclass for defining Abstract Base Classes (ABCs)."
#: ../Doc/library/abc.rst:59
"Use this metaclass to create an ABC.  An ABC can be subclassed directly, "
"and then acts as a mix-in class.  You can also register unrelated "
"concrete classes (even built-in classes) and unrelated ABCs as \"virtual "
"subclasses\" -- these and their descendants will be considered subclasses"
" of the registering ABC by the built-in :func:`issubclass` function, but "
"the registering ABC won't show up in their MRO (Method Resolution Order) "
"nor will method implementations defined by the registering ABC be "
"callable (not even via :func:`super`). [#]_"
#: ../Doc/library/abc.rst:68
"Classes created with a metaclass of :class:`ABCMeta` have the following "
#: ../Doc/library/abc.rst:72
msgid "Register *subclass* as a \"virtual subclass\" of this ABC. For example::"
#: ../Doc/library/abc.rst:85
msgid "Returns the registered subclass, to allow usage as a class decorator."
#: ../Doc/library/abc.rst:88
"To detect calls to :meth:`register`, you can use the "
":func:`get_cache_token` function."
#: ../Doc/library/abc.rst:92
msgid "You can also override this method in an abstract base class:"
#: ../Doc/library/abc.rst:96
msgid "(Must be defined as a class method.)"
#: ../Doc/library/abc.rst:98
"Check whether *subclass* is considered a subclass of this ABC.  This "
"means that you can customize the behavior of ``issubclass`` further "
"without the need to call :meth:`register` on every class you want to "
"consider a subclass of the ABC.  (This class method is called from the "
":meth:`__subclasscheck__` method of the ABC.)"
#: ../Doc/library/abc.rst:104
"This method should return ``True``, ``False`` or ``NotImplemented``.  If "
"it returns ``True``, the *subclass* is considered a subclass of this ABC."
" If it returns ``False``, the *subclass* is not considered a subclass of "
"this ABC, even if it would normally be one.  If it returns "
"``NotImplemented``, the subclass check is continued with the usual "
"mechanism."
#: ../Doc/library/abc.rst:114
"For a demonstration of these concepts, look at this example ABC "
"definition::"
#: ../Doc/library/abc.rst:143
"The ABC ``MyIterable`` defines the standard iterable method, "
":meth:`~iterator.__iter__`, as an abstract method.  The implementation "
"given here can still be called from subclasses.  The :meth:`get_iterator`"
" method is also part of the ``MyIterable`` abstract base class, but it "
"does not have to be overridden in non-abstract derived classes."
#: ../Doc/library/abc.rst:149
"The :meth:`__subclasshook__` class method defined here says that any "
"class that has an :meth:`~iterator.__iter__` method in its "
":attr:`~object.__dict__` (or in that of one of its base classes, accessed"
" via the :attr:`~class.__mro__` list) is considered a ``MyIterable`` too."
#: ../Doc/library/abc.rst:154
"Finally, the last line makes ``Foo`` a virtual subclass of "
"``MyIterable``, even though it does not define an "
":meth:`~iterator.__iter__` method (it uses the old-style iterable "
"protocol, defined in terms of :meth:`__len__` and :meth:`__getitem__`).  "
"Note that this will not make ``get_iterator`` available as a method of "
"``Foo``, so it is provided separately."
#: ../Doc/library/abc.rst:163
msgid "The :mod:`abc` module also provides the following decorator:"
#: ../Doc/library/abc.rst:167
msgid "A decorator indicating abstract methods."
#: ../Doc/library/abc.rst:169
"Using this decorator requires that the class's metaclass is "
":class:`ABCMeta` or is derived from it.  A class that has a metaclass "
"derived from :class:`ABCMeta` cannot be instantiated unless all of its "
"abstract methods and properties are overridden.  The abstract methods can"
" be called using any of the normal 'super' call mechanisms.  "
":func:`abstractmethod` may be used to declare abstract methods for "
"properties and descriptors."
#: ../Doc/library/abc.rst:176
"Dynamically adding abstract methods to a class, or attempting to modify "
"the abstraction status of a method or class once it is created, are not "
"supported.  The :func:`abstractmethod` only affects subclasses derived "
"using regular inheritance; \"virtual subclasses\" registered with the "
"ABC's :meth:`register` method are not affected."
#: ../Doc/library/abc.rst:182
"When :func:`abstractmethod` is applied in combination with other method "
"descriptors, it should be applied as the innermost decorator, as shown in"
" the following usage examples::"
#: ../Doc/library/abc.rst:216
"In order to correctly interoperate with the abstract base class "
"machinery, the descriptor must identify itself as abstract using "
":attr:`__isabstractmethod__`. In general, this attribute should be "
"``True`` if any of the methods used to compose the descriptor are "
"abstract. For example, Python's built-in property does the equivalent "
#: ../Doc/library/abc.rst:231
"Unlike Java abstract methods, these abstract methods may have an "
"implementation. This implementation can be called via the :func:`super` "
"mechanism from the class that overrides it.  This could be useful as an "
"end-point for a super-call in a framework that uses cooperative multiple-"
"inheritance."
#: ../Doc/library/abc.rst:239
msgid "The :mod:`abc` module also supports the following legacy decorators:"
#: ../Doc/library/abc.rst:244
"It is now possible to use :class:`classmethod` with "
":func:`abstractmethod`, making this decorator redundant."
#: ../Doc/library/abc.rst:248
"A subclass of the built-in :func:`classmethod`, indicating an abstract "
"classmethod. Otherwise it is similar to :func:`abstractmethod`."
#: ../Doc/library/abc.rst:251
"This special case is deprecated, as the :func:`classmethod` decorator is "
"now correctly identified as abstract when applied to an abstract method::"
#: ../Doc/library/abc.rst:265
"It is now possible to use :class:`staticmethod` with "
":func:`abstractmethod`, making this decorator redundant."
#: ../Doc/library/abc.rst:269
"A subclass of the built-in :func:`staticmethod`, indicating an abstract "
"staticmethod. Otherwise it is similar to :func:`abstractmethod`."
#: ../Doc/library/abc.rst:272
"This special case is deprecated, as the :func:`staticmethod` decorator is"
" now correctly identified as abstract when applied to an abstract "
#: ../Doc/library/abc.rst:285
"It is now possible to use :class:`property`, :meth:`property.getter`, "
":meth:`property.setter` and :meth:`property.deleter` with "
":func:`abstractmethod`, making this decorator redundant."
#: ../Doc/library/abc.rst:290
"A subclass of the built-in :func:`property`, indicating an abstract "
"property."
#: ../Doc/library/abc.rst:293
"This special case is deprecated, as the :func:`property` decorator is now"
" correctly identified as abstract when applied to an abstract method::"
#: ../Doc/library/abc.rst:303
"The above example defines a read-only property; you can also define a "
"read-write abstract property by appropriately marking one or more of the "
"underlying methods as abstract::"
#: ../Doc/library/abc.rst:317
"If only some components are abstract, only those components need to be "
"updated to create a concrete property in a subclass::"
#: ../Doc/library/abc.rst:326
msgid "The :mod:`abc` module also provides the following functions:"
#: ../Doc/library/abc.rst:330
msgid "Returns the current abstract base class cache token."
#: ../Doc/library/abc.rst:332
"The token is an opaque object (that supports equality testing) "
"identifying the current version of the abstract base class cache for "
"virtual subclasses. The token changes with every call to "
":meth:`ABCMeta.register` on any ABC."
#: ../Doc/library/abc.rst:340
msgid "Footnotes"
#: ../Doc/library/abc.rst:341
"C++ programmers should note that Python's virtual base class concept is "
"not the same as C++'s."
#~ msgid "The :mod:`abc` module also provides the following decorators:"
#~ msgstr ""
#~ msgid ""
#~ "Using this function requires that the"
#~ " class's metaclass is :class:`ABCMeta` or"
#~ " is derived from it. A class "
#~ "that has a metaclass derived from "
#~ ":class:`ABCMeta` cannot be instantiated unless"
#~ " all of its abstract methods and "
#~ "properties are overridden. The abstract "
#~ "properties can be called using any "
#~ "of the normal 'super' call mechanisms."
#~ msgstr ""
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