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Name	Size	Permission	Date
2to3.rst	16.15 KB	-rw-r--r--	2024-03-19 22:46
__future__.rst	6 KB	-rw-r--r--	2024-03-19 22:46
__main__.rst	12.34 KB	-rw-r--r--	2024-03-19 22:46
_thread.rst	7.88 KB	-rw-r--r--	2024-03-19 22:46
abc.rst	12.19 KB	-rw-r--r--	2024-03-19 22:46
aifc.rst	7.48 KB	-rw-r--r--	2024-03-19 22:46
allos.rst	678 B	-rw-r--r--	2024-03-19 22:46
archiving.rst	440 B	-rw-r--r--	2024-03-19 22:46
argparse.rst	80.31 KB	-rw-r--r--	2024-03-19 22:46
array.rst	10.45 KB	-rw-r--r--	2024-03-19 22:46
ast.rst	75.95 KB	-rw-r--r--	2024-03-19 22:46
asynchat.rst	8.44 KB	-rw-r--r--	2024-03-19 22:46
asyncio-api-index.rst	4.61 KB	-rw-r--r--	2024-03-19 22:46
asyncio-dev.rst	7.31 KB	-rw-r--r--	2024-03-19 22:46
asyncio-eventloop.rst	59.33 KB	-rw-r--r--	2024-03-19 22:46
asyncio-exceptions.rst	1.7 KB	-rw-r--r--	2024-03-19 22:46
asyncio-future.rst	8.31 KB	-rw-r--r--	2024-03-19 22:46
asyncio-llapi-index.rst	14.06 KB	-rw-r--r--	2024-03-19 22:46
asyncio-platforms.rst	3.03 KB	-rw-r--r--	2024-03-19 22:46
asyncio-policy.rst	9.17 KB	-rw-r--r--	2024-03-19 22:46
asyncio-protocol.rst	31.55 KB	-rw-r--r--	2024-03-19 22:46
asyncio-queue.rst	5.5 KB	-rw-r--r--	2024-03-19 22:46
asyncio-stream.rst	14.88 KB	-rw-r--r--	2024-03-19 22:46
asyncio-subprocess.rst	11.4 KB	-rw-r--r--	2024-03-19 22:46
asyncio-sync.rst	8.84 KB	-rw-r--r--	2024-03-19 22:46
asyncio-task.rst	32.29 KB	-rw-r--r--	2024-03-19 22:46
asyncio.rst	2.63 KB	-rw-r--r--	2024-03-19 22:46
asyncore.rst	13.43 KB	-rw-r--r--	2024-03-19 22:46
atexit.rst	3.84 KB	-rw-r--r--	2024-03-19 22:46
audioop.rst	10.59 KB	-rw-r--r--	2024-03-19 22:46
audit_events.rst	2.29 KB	-rw-r--r--	2024-03-19 22:46
base64.rst	10.87 KB	-rw-r--r--	2024-03-19 22:46
bdb.rst	14.54 KB	-rw-r--r--	2024-03-19 22:46
binary.rst	654 B	-rw-r--r--	2024-03-19 22:46
binascii.rst	7.66 KB	-rw-r--r--	2024-03-19 22:46
binhex.rst	1.69 KB	-rw-r--r--	2024-03-19 22:46
bisect.rst	9.06 KB	-rw-r--r--	2024-03-19 22:46
builtins.rst	1.43 KB	-rw-r--r--	2024-03-19 22:46
bz2.rst	11.87 KB	-rw-r--r--	2024-03-19 22:46
calendar.rst	14.17 KB	-rw-r--r--	2024-03-19 22:46
cgi.rst	21.49 KB	-rw-r--r--	2024-03-19 22:46
cgitb.rst	3.75 KB	-rw-r--r--	2024-03-19 22:46
chunk.rst	5.1 KB	-rw-r--r--	2024-03-19 22:46
cmath.rst	9.42 KB	-rw-r--r--	2024-03-19 22:46
cmd.rst	13.6 KB	-rw-r--r--	2024-03-19 22:46
code.rst	7.64 KB	-rw-r--r--	2024-03-19 22:46
codecs.rst	75.37 KB	-rw-r--r--	2024-03-19 22:46
codeop.rst	3 KB	-rw-r--r--	2024-03-19 22:46
collections.abc.rst	16.73 KB	-rw-r--r--	2024-03-19 22:46
collections.rst	52.13 KB	-rw-r--r--	2024-03-19 22:46
colorsys.rst	1.77 KB	-rw-r--r--	2024-03-19 22:46
compileall.rst	13.45 KB	-rw-r--r--	2024-03-19 22:46
concurrency.rst	685 B	-rw-r--r--	2024-03-19 22:46
concurrent.futures.rst	20.76 KB	-rw-r--r--	2024-03-19 22:46
concurrent.rst	171 B	-rw-r--r--	2024-03-19 22:46
configparser.rst	49.91 KB	-rw-r--r--	2024-03-19 22:46
constants.rst	3.77 KB	-rw-r--r--	2024-03-19 22:46
contextlib.rst	34.35 KB	-rw-r--r--	2024-03-19 22:46
contextvars.rst	8.32 KB	-rw-r--r--	2024-03-19 22:46
copy.rst	3.39 KB	-rw-r--r--	2024-03-19 22:46
copyreg.rst	1.97 KB	-rw-r--r--	2024-03-19 22:46
crypt.rst	5.84 KB	-rw-r--r--	2024-03-19 22:46
crypto.rst	411 B	-rw-r--r--	2024-03-19 22:46
csv.rst	20.91 KB	-rw-r--r--	2024-03-19 22:46
ctypes.rst	90.63 KB	-rw-r--r--	2024-03-19 22:46
curses.ascii.rst	8.85 KB	-rw-r--r--	2024-03-19 22:46
curses.panel.rst	2.7 KB	-rw-r--r--	2024-03-19 22:46
curses.rst	77.03 KB	-rw-r--r--	2024-03-19 22:46
custominterp.rst	569 B	-rw-r--r--	2024-03-19 22:46
dataclasses.rst	29.22 KB	-rw-r--r--	2024-03-19 22:46
datatypes.rst	817 B	-rw-r--r--	2024-03-19 22:46
datetime.rst	101.93 KB	-rw-r--r--	2024-03-19 22:46
dbm.rst	15.05 KB	-rw-r--r--	2024-03-19 22:46
debug.rst	611 B	-rw-r--r--	2024-03-19 22:46
decimal.rst	76.21 KB	-rw-r--r--	2024-03-19 22:46
development.rst	719 B	-rw-r--r--	2024-03-19 22:46
devmode.rst	7.28 KB	-rw-r--r--	2024-03-19 22:46
dialog.rst	6.12 KB	-rw-r--r--	2024-03-19 22:46
difflib.rst	29.76 KB	-rw-r--r--	2024-03-19 22:46
dis.rst	35.33 KB	-rw-r--r--	2024-03-19 22:46
distribution.rst	452 B	-rw-r--r--	2024-03-19 22:46
distutils.rst	2.09 KB	-rw-r--r--	2024-03-19 22:46
doctest.rst	69.87 KB	-rw-r--r--	2024-03-19 22:46
email.charset.rst	7.83 KB	-rw-r--r--	2024-03-19 22:46
email.compat32-message.rst	32.89 KB	-rw-r--r--	2024-03-19 22:46
email.contentmanager.rst	8.9 KB	-rw-r--r--	2024-03-19 22:46
email.encoders.rst	2.92 KB	-rw-r--r--	2024-03-19 22:46
email.errors.rst	4.8 KB	-rw-r--r--	2024-03-19 22:46
email.examples.rst	1.87 KB	-rw-r--r--	2024-03-19 22:46
email.generator.rst	13.49 KB	-rw-r--r--	2024-03-19 22:46
email.header.rst	8.97 KB	-rw-r--r--	2024-03-19 22:46
email.headerregistry.rst	18.04 KB	-rw-r--r--	2024-03-19 22:46
email.iterators.rst	2.73 KB	-rw-r--r--	2024-03-19 22:46
email.message.rst	32.25 KB	-rw-r--r--	2024-03-19 22:46
email.mime.rst	11.45 KB	-rw-r--r--	2024-03-19 22:46
email.parser.rst	13.76 KB	-rw-r--r--	2024-03-19 22:46
email.policy.rst	26.39 KB	-rw-r--r--	2024-03-19 22:46
email.rst	6.63 KB	-rw-r--r--	2024-03-19 22:46
email.utils.rst	9.17 KB	-rw-r--r--	2024-03-19 22:46
ensurepip.rst	4.9 KB	-rw-r--r--	2024-03-19 22:46
enum.rst	35.96 KB	-rw-r--r--	2024-03-19 22:46
errno.rst	7.81 KB	-rw-r--r--	2024-03-19 22:46
exceptions.rst	29.86 KB	-rw-r--r--	2024-03-19 22:46
faulthandler.rst	6.51 KB	-rw-r--r--	2024-03-19 22:46
fcntl.rst	7.99 KB	-rw-r--r--	2024-03-19 22:46
filecmp.rst	5.89 KB	-rw-r--r--	2024-03-19 22:46
fileformats.rst	273 B	-rw-r--r--	2024-03-19 22:46
fileinput.rst	8.99 KB	-rw-r--r--	2024-03-19 22:46
filesys.rst	946 B	-rw-r--r--	2024-03-19 22:46
fnmatch.rst	3.31 KB	-rw-r--r--	2024-03-19 22:46
fractions.rst	6.2 KB	-rw-r--r--	2024-03-19 22:46
frameworks.rst	391 B	-rw-r--r--	2024-03-19 22:46
ftplib.rst	18.13 KB	-rw-r--r--	2024-03-19 22:46
functional.rst	365 B	-rw-r--r--	2024-03-19 22:46
functions.rst	84.5 KB	-rw-r--r--	2024-03-19 22:46
functools.rst	25.99 KB	-rw-r--r--	2024-03-19 22:46
gc.rst	11.16 KB	-rw-r--r--	2024-03-19 22:46
getopt.rst	6.4 KB	-rw-r--r--	2024-03-19 22:46
getpass.rst	1.84 KB	-rw-r--r--	2024-03-19 22:46
gettext.rst	27.35 KB	-rw-r--r--	2024-03-19 22:46
glob.rst	5.07 KB	-rw-r--r--	2024-03-19 22:46
graphlib.rst	8.56 KB	-rw-r--r--	2024-03-19 22:46
grp.rst	2.32 KB	-rw-r--r--	2024-03-19 22:46
gzip.rst	9.7 KB	-rw-r--r--	2024-03-19 22:46
hashlib-blake2-tree.png	10.81 KB	-rw-r--r--	2024-03-19 22:46
hashlib.rst	27.32 KB	-rw-r--r--	2024-03-19 22:46
heapq.rst	13.59 KB	-rw-r--r--	2024-03-19 22:46
hmac.rst	4.93 KB	-rw-r--r--	2024-03-19 22:46
html.entities.rst	1.31 KB	-rw-r--r--	2024-03-19 22:46
html.parser.rst	11.02 KB	-rw-r--r--	2024-03-19 22:46
html.rst	1.27 KB	-rw-r--r--	2024-03-19 22:46
http.client.rst	20.86 KB	-rw-r--r--	2024-03-19 22:46
http.cookiejar.rst	27.68 KB	-rw-r--r--	2024-03-19 22:46
http.cookies.rst	8.79 KB	-rw-r--r--	2024-03-19 22:46
http.rst	7.61 KB	-rw-r--r--	2024-03-19 22:46
http.server.rst	19.68 KB	-rw-r--r--	2024-03-19 22:46
i18n.rst	408 B	-rw-r--r--	2024-03-19 22:46
idle.rst	38.83 KB	-rw-r--r--	2024-03-19 22:46
imaplib.rst	21.42 KB	-rw-r--r--	2024-03-19 22:46
imghdr.rst	3.01 KB	-rw-r--r--	2024-03-19 22:46
imp.rst	15.15 KB	-rw-r--r--	2024-03-19 22:46
importlib.metadata.rst	12.12 KB	-rw-r--r--	2024-03-19 22:46
importlib.rst	66.95 KB	-rw-r--r--	2024-03-19 22:46
index.rst	2.37 KB	-rw-r--r--	2024-03-19 22:46
inspect.rst	59.36 KB	-rw-r--r--	2024-03-19 22:46
internet.rst	923 B	-rw-r--r--	2024-03-19 22:46
intro.rst	2.95 KB	-rw-r--r--	2024-03-19 22:46
io.rst	44.14 KB	-rw-r--r--	2024-03-19 22:46
ipaddress.rst	35.22 KB	-rw-r--r--	2024-03-19 22:46
ipc.rst	643 B	-rw-r--r--	2024-03-19 22:46
itertools.rst	42.1 KB	-rw-r--r--	2024-03-19 22:46
json.rst	28.07 KB	-rw-r--r--	2024-03-19 22:46
keyword.rst	1.12 KB	-rw-r--r--	2024-03-19 22:46
language.rst	494 B	-rw-r--r--	2024-03-19 22:46
linecache.rst	2.49 KB	-rw-r--r--	2024-03-19 22:46
locale.rst	26.03 KB	-rw-r--r--	2024-03-19 22:46
logging.config.rst	36.69 KB	-rw-r--r--	2024-03-19 22:46
logging.handlers.rst	47.53 KB	-rw-r--r--	2024-03-19 22:46
logging.rst	66.77 KB	-rw-r--r--	2024-03-19 22:46
lzma.rst	16.95 KB	-rw-r--r--	2024-03-19 22:46
mailbox.rst	61.47 KB	-rw-r--r--	2024-03-19 22:46
mailcap.rst	4.43 KB	-rw-r--r--	2024-03-19 22:46
markup.rst	679 B	-rw-r--r--	2024-03-19 22:46
marshal.rst	5.35 KB	-rw-r--r--	2024-03-19 22:46
math.rst	21.01 KB	-rw-r--r--	2024-03-19 22:46
mimetypes.rst	9.96 KB	-rw-r--r--	2024-03-19 22:46
mm.rst	331 B	-rw-r--r--	2024-03-19 22:46
mmap.rst	13.41 KB	-rw-r--r--	2024-03-19 22:46
modulefinder.rst	3.16 KB	-rw-r--r--	2024-03-19 22:46
modules.rst	381 B	-rw-r--r--	2024-03-19 22:46
msilib.rst	18.51 KB	-rw-r--r--	2024-03-19 22:46
msvcrt.rst	4.5 KB	-rw-r--r--	2024-03-19 22:46
multiprocessing.rst	108.08 KB	-rw-r--r--	2024-03-19 22:46
multiprocessing.shared_memory.rst	14.44 KB	-rw-r--r--	2024-03-19 22:46
netdata.rst	314 B	-rw-r--r--	2024-03-19 22:46
netrc.rst	3.32 KB	-rw-r--r--	2024-03-19 22:46
nis.rst	2.07 KB	-rw-r--r--	2024-03-19 22:46
nntplib.rst	21.25 KB	-rw-r--r--	2024-03-19 22:46
numbers.rst	8.09 KB	-rw-r--r--	2024-03-19 22:46
numeric.rst	696 B	-rw-r--r--	2024-03-19 22:46
operator.rst	18.84 KB	-rw-r--r--	2024-03-19 22:46
optparse.rst	75.3 KB	-rw-r--r--	2024-03-19 22:46
os.path.rst	17.4 KB	-rw-r--r--	2024-03-19 22:46
os.rst	168.21 KB	-rw-r--r--	2024-03-19 22:46
ossaudiodev.rst	17.56 KB	-rw-r--r--	2024-03-19 22:46
pathlib-inheritance.png	6.28 KB	-rw-r--r--	2024-03-19 22:46
pathlib-inheritance.svg	55.23 KB	-rw-r--r--	2024-03-19 22:46
pathlib.rst	39.66 KB	-rw-r--r--	2024-03-19 22:46
pdb.rst	20.26 KB	-rw-r--r--	2024-03-19 22:46
persistence.rst	591 B	-rw-r--r--	2024-03-19 22:46
pickle.rst	46.52 KB	-rw-r--r--	2024-03-19 22:46
pickletools.rst	3.64 KB	-rw-r--r--	2024-03-19 22:46
pipes.rst	2.72 KB	-rw-r--r--	2024-03-19 22:46
pkgutil.rst	10.26 KB	-rw-r--r--	2024-03-19 22:46
platform.rst	9.7 KB	-rw-r--r--	2024-03-19 22:46
plistlib.rst	5.32 KB	-rw-r--r--	2024-03-19 22:46
poplib.rst	8.98 KB	-rw-r--r--	2024-03-19 22:46
posix.rst	3.52 KB	-rw-r--r--	2024-03-19 22:46
pprint.rst	16.34 KB	-rw-r--r--	2024-03-19 22:46
profile.rst	29.55 KB	-rw-r--r--	2024-03-19 22:46
pty.rst	4.5 KB	-rw-r--r--	2024-03-19 22:46
pwd.rst	2.67 KB	-rw-r--r--	2024-03-19 22:46
py_compile.rst	6.52 KB	-rw-r--r--	2024-03-19 22:46
pyclbr.rst	4.45 KB	-rw-r--r--	2024-03-19 22:46
pydoc.rst	5.01 KB	-rw-r--r--	2024-03-19 22:46
pyexpat.rst	29.52 KB	-rw-r--r--	2024-03-19 22:46
python.rst	480 B	-rw-r--r--	2024-03-19 22:46
queue.rst	10 KB	-rw-r--r--	2024-03-19 22:46
quopri.rst	2.51 KB	-rw-r--r--	2024-03-19 22:46
random.rst	22.98 KB	-rw-r--r--	2024-03-19 22:46
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readline.rst	12.13 KB	-rw-r--r--	2024-03-19 22:46
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resource.rst	13 KB	-rw-r--r--	2024-03-19 22:46
rlcompleter.rst	2.24 KB	-rw-r--r--	2024-03-19 22:46
runpy.rst	8.09 KB	-rw-r--r--	2024-03-19 22:46
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security_warnings.rst	1.56 KB	-rw-r--r--	2024-03-19 22:46
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signal.rst	25.12 KB	-rw-r--r--	2024-03-19 22:46
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sqlite3.rst	66.94 KB	-rw-r--r--	2024-03-19 22:46
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stringprep.rst	4.18 KB	-rw-r--r--	2024-03-19 22:46
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subprocess.rst	57.99 KB	-rw-r--r--	2024-03-19 22:46
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telnetlib.rst	8.03 KB	-rw-r--r--	2024-03-19 22:46
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termios.rst	3.66 KB	-rw-r--r--	2024-03-19 22:46
test.rst	54.87 KB	-rw-r--r--	2024-03-19 22:46
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threading.rst	42.74 KB	-rw-r--r--	2024-03-19 22:46
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Rename

:mod:`collections.abc` --- Abstract Base Classes for Containers
===============================================================

.. module:: collections.abc
   :synopsis: Abstract base classes for containers

.. moduleauthor:: Raymond Hettinger <python at rcn.com>
.. sectionauthor:: Raymond Hettinger <python at rcn.com>

.. versionadded:: 3.3
   Formerly, this module was part of the :mod:`collections` module.

**Source code:** :source:`Lib/_collections_abc.py`

.. testsetup:: *

from collections.abc import *
   import itertools
   __name__ = '<doctest>'

--------------

This module provides :term:`abstract base classes <abstract base class>` that
can be used to test whether a class provides a particular interface; for
example, whether it is :term:`hashable` or whether it is a mapping.

An :func:`issubclass` or :func:`isinstance` test for an interface works in one
of three ways.

1) A newly written class can inherit directly from one of the
abstract base classes.  The class must supply the required abstract
methods.  The remaining mixin methods come from inheritance and can be
overridden if desired.  Other methods may be added as needed:

.. testcode::

class C(Sequence):                      # Direct inheritance
        def __init__(self): ...             # Extra method not required by the ABC
        def __getitem__(self, index):  ...  # Required abstract method
        def __len__(self):  ...             # Required abstract method
        def count(self, value): ...         # Optionally override a mixin method

.. doctest::

>>> issubclass(C, Sequence)
   True
   >>> isinstance(C(), Sequence)
   True

2) Existing classes and built-in classes can be registered as "virtual
subclasses" of the ABCs.  Those classes should define the full API
including all of the abstract methods and all of the mixin methods.
This lets users rely on :func:`issubclass` or :func:`isinstance` tests
to determine whether the full interface is supported.  The exception to
this rule is for methods that are automatically inferred from the rest
of the API:

.. testcode::

class D:                                 # No inheritance
        def __init__(self): ...              # Extra method not required by the ABC
        def __getitem__(self, index):  ...   # Abstract method
        def __len__(self):  ...              # Abstract method
        def count(self, value): ...          # Mixin method
        def index(self, value): ...          # Mixin method

Sequence.register(D)                     # Register instead of inherit

.. doctest::

>>> issubclass(D, Sequence)
   True
   >>> isinstance(D(), Sequence)
   True

In this example, class :class:`D` does not need to define
``__contains__``, ``__iter__``, and ``__reversed__`` because the
:ref:`in-operator <comparisons>`, the :term:`iteration <iterable>`
logic, and the :func:`reversed` function automatically fall back to
using ``__getitem__`` and ``__len__``.

3) Some simple interfaces are directly recognizable by the presence of
the required methods (unless those methods have been set to
:const:`None`):

.. testcode::

class E:
        def __iter__(self): ...
        def __next__(next): ...

.. doctest::

>>> issubclass(E, Iterable)
   True
   >>> isinstance(E(), Iterable)
   True

Complex interfaces do not support this last technique because an
interface is more than just the presence of method names.  Interfaces
specify semantics and relationships between methods that cannot be
inferred solely from the presence of specific method names.  For
example, knowing that a class supplies ``__getitem__``, ``__len__``, and
``__iter__`` is insufficient for distinguishing a :class:`Sequence` from
a :class:`Mapping`.

.. versionadded:: 3.9
   These abstract classes now support ``[]``. See :ref:`types-genericalias`
   and :pep:`585`.

.. _collections-abstract-base-classes:

Collections Abstract Base Classes
---------------------------------

The collections module offers the following :term:`ABCs <abstract base class>`:

.. tabularcolumns:: |l|L|L|L|

============================== ====================== ======================= ====================================================
ABC                            Inherits from          Abstract Methods        Mixin Methods
============================== ====================== ======================= ====================================================
:class:`Container` [1]_                               ``__contains__``
:class:`Hashable` [1]_                                ``__hash__``
:class:`Iterable` [1]_ [2]_                           ``__iter__``
:class:`Iterator` [1]_         :class:`Iterable`      ``__next__``            ``__iter__``
:class:`Reversible` [1]_       :class:`Iterable`      ``__reversed__``
:class:`Generator`  [1]_       :class:`Iterator`      ``send``, ``throw``     ``close``, ``__iter__``, ``__next__``
:class:`Sized`  [1]_                                  ``__len__``
:class:`Callable`  [1]_                               ``__call__``
:class:`Collection`  [1]_      :class:`Sized`,        ``__contains__``,
                               :class:`Iterable`,     ``__iter__``,
                               :class:`Container`     ``__len__``

:class:`Sequence`              :class:`Reversible`,   ``__getitem__``,        ``__contains__``, ``__iter__``, ``__reversed__``,
                               :class:`Collection`    ``__len__``             ``index``, and ``count``

:class:`MutableSequence`       :class:`Sequence`      ``__getitem__``,        Inherited :class:`Sequence` methods and
                                                      ``__setitem__``,        ``append``, ``reverse``, ``extend``, ``pop``,
                                                      ``__delitem__``,        ``remove``, and ``__iadd__``
                                                      ``__len__``,
                                                      ``insert``

:class:`ByteString`            :class:`Sequence`      ``__getitem__``,        Inherited :class:`Sequence` methods
                                                      ``__len__``

:class:`Set`                   :class:`Collection`    ``__contains__``,       ``__le__``, ``__lt__``, ``__eq__``, ``__ne__``,
                                                      ``__iter__``,           ``__gt__``, ``__ge__``, ``__and__``, ``__or__``,
                                                      ``__len__``             ``__sub__``, ``__xor__``, and ``isdisjoint``

:class:`MutableSet`            :class:`Set`           ``__contains__``,       Inherited :class:`Set` methods and
                                                      ``__iter__``,           ``clear``, ``pop``, ``remove``, ``__ior__``,
                                                      ``__len__``,            ``__iand__``, ``__ixor__``, and ``__isub__``
                                                      ``add``,
                                                      ``discard``

:class:`Mapping`               :class:`Collection`    ``__getitem__``,        ``__contains__``, ``keys``, ``items``, ``values``,
                                                      ``__iter__``,           ``get``, ``__eq__``, and ``__ne__``
                                                      ``__len__``

:class:`MutableMapping`        :class:`Mapping`       ``__getitem__``,        Inherited :class:`Mapping` methods and
                                                      ``__setitem__``,        ``pop``, ``popitem``, ``clear``, ``update``,
                                                      ``__delitem__``,        and ``setdefault``
                                                      ``__iter__``,
                                                      ``__len__``

:class:`MappingView`           :class:`Sized`                                 ``__len__``
:class:`ItemsView`             :class:`MappingView`,                          ``__contains__``,
                               :class:`Set`                                   ``__iter__``
:class:`KeysView`              :class:`MappingView`,                          ``__contains__``,
                               :class:`Set`                                   ``__iter__``
:class:`ValuesView`            :class:`MappingView`,                          ``__contains__``, ``__iter__``
                               :class:`Collection`
:class:`Awaitable` [1]_                               ``__await__``
:class:`Coroutine` [1]_        :class:`Awaitable`     ``send``, ``throw``     ``close``
:class:`AsyncIterable` [1]_                           ``__aiter__``
:class:`AsyncIterator` [1]_    :class:`AsyncIterable` ``__anext__``           ``__aiter__``
:class:`AsyncGenerator` [1]_   :class:`AsyncIterator` ``asend``, ``athrow``   ``aclose``, ``__aiter__``, ``__anext__``
============================== ====================== ======================= ====================================================

.. rubric:: Footnotes

.. [1] These ABCs override :meth:`object.__subclasshook__` to support
   testing an interface by verifying the required methods are present
   and have not been set to :const:`None`.  This only works for simple
   interfaces.  More complex interfaces require registration or direct
   subclassing.

.. [2] Checking ``isinstance(obj, Iterable)`` detects classes that are
   registered as :class:`Iterable` or that have an :meth:`__iter__`
   method, but it does not detect classes that iterate with the
   :meth:`__getitem__` method.  The only reliable way to determine
   whether an object is :term:`iterable` is to call ``iter(obj)``.

Collections Abstract Base Classes -- Detailed Descriptions
----------------------------------------------------------

.. class:: Container

ABC for classes that provide the :meth:`__contains__` method.

.. class:: Hashable

ABC for classes that provide the :meth:`__hash__` method.

.. class:: Sized

ABC for classes that provide the :meth:`__len__` method.

.. class:: Callable

ABC for classes that provide the :meth:`__call__` method.

.. class:: Iterable

ABC for classes that provide the :meth:`__iter__` method.

Checking ``isinstance(obj, Iterable)`` detects classes that are registered
   as :class:`Iterable` or that have an :meth:`__iter__` method, but it does
   not detect classes that iterate with the :meth:`__getitem__` method.
   The only reliable way to determine whether an object is :term:`iterable`
   is to call ``iter(obj)``.

.. class:: Collection

ABC for sized iterable container classes.

.. versionadded:: 3.6

.. class:: Iterator

ABC for classes that provide the :meth:`~iterator.__iter__` and
   :meth:`~iterator.__next__` methods.  See also the definition of
   :term:`iterator`.

.. class:: Reversible

ABC for iterable classes that also provide the :meth:`__reversed__`
   method.

.. versionadded:: 3.6

.. class:: Generator

ABC for generator classes that implement the protocol defined in
   :pep:`342` that extends iterators with the :meth:`~generator.send`,
   :meth:`~generator.throw` and :meth:`~generator.close` methods.
   See also the definition of :term:`generator`.

.. versionadded:: 3.5

.. class:: Sequence
           MutableSequence
           ByteString

ABCs for read-only and mutable :term:`sequences <sequence>`.

Implementation note: Some of the mixin methods, such as
   :meth:`__iter__`, :meth:`__reversed__` and :meth:`index`, make
   repeated calls to the underlying :meth:`__getitem__` method.
   Consequently, if :meth:`__getitem__` is implemented with constant
   access speed, the mixin methods will have linear performance;
   however, if the underlying method is linear (as it would be with a
   linked list), the mixins will have quadratic performance and will
   likely need to be overridden.

.. versionchanged:: 3.5
      The index() method added support for *stop* and *start*
      arguments.

.. class:: Set
           MutableSet

ABCs for read-only and mutable sets.

.. class:: Mapping
           MutableMapping

ABCs for read-only and mutable :term:`mappings <mapping>`.

.. class:: MappingView
           ItemsView
           KeysView
           ValuesView

ABCs for mapping, items, keys, and values :term:`views <dictionary view>`.

.. class:: Awaitable

ABC for :term:`awaitable` objects, which can be used in :keyword:`await`
   expressions.  Custom implementations must provide the :meth:`__await__`
   method.

:term:`Coroutine <coroutine>` objects and instances of the
   :class:`~collections.abc.Coroutine` ABC are all instances of this ABC.

.. note::
      In CPython, generator-based coroutines (generators decorated with
      :func:`types.coroutine` or :func:`asyncio.coroutine`) are
      *awaitables*, even though they do not have an :meth:`__await__` method.
      Using ``isinstance(gencoro, Awaitable)`` for them will return ``False``.
      Use :func:`inspect.isawaitable` to detect them.

.. versionadded:: 3.5

.. class:: Coroutine

ABC for coroutine compatible classes.  These implement the
   following methods, defined in :ref:`coroutine-objects`:
   :meth:`~coroutine.send`, :meth:`~coroutine.throw`, and
   :meth:`~coroutine.close`.  Custom implementations must also implement
   :meth:`__await__`.  All :class:`Coroutine` instances are also instances of
   :class:`Awaitable`.  See also the definition of :term:`coroutine`.

.. note::
      In CPython, generator-based coroutines (generators decorated with
      :func:`types.coroutine` or :func:`asyncio.coroutine`) are
      *awaitables*, even though they do not have an :meth:`__await__` method.
      Using ``isinstance(gencoro, Coroutine)`` for them will return ``False``.
      Use :func:`inspect.isawaitable` to detect them.

.. versionadded:: 3.5

.. class:: AsyncIterable

ABC for classes that provide ``__aiter__`` method.  See also the
   definition of :term:`asynchronous iterable`.

.. versionadded:: 3.5

.. class:: AsyncIterator

ABC for classes that provide ``__aiter__`` and ``__anext__``
   methods.  See also the definition of :term:`asynchronous iterator`.

.. versionadded:: 3.5

.. class:: AsyncGenerator

ABC for asynchronous generator classes that implement the protocol
   defined in :pep:`525` and :pep:`492`.

.. versionadded:: 3.6

Examples and Recipes
--------------------

ABCs allow us to ask classes or instances if they provide
particular functionality, for example::

size = None
    if isinstance(myvar, collections.abc.Sized):
        size = len(myvar)

Several of the ABCs are also useful as mixins that make it easier to develop
classes supporting container APIs.  For example, to write a class supporting
the full :class:`Set` API, it is only necessary to supply the three underlying
abstract methods: :meth:`__contains__`, :meth:`__iter__`, and :meth:`__len__`.
The ABC supplies the remaining methods such as :meth:`__and__` and
:meth:`isdisjoint`::

class ListBasedSet(collections.abc.Set):
        ''' Alternate set implementation favoring space over speed
            and not requiring the set elements to be hashable. '''
        def __init__(self, iterable):
            self.elements = lst = []
            for value in iterable:
                if value not in lst:
                    lst.append(value)

def __iter__(self):
            return iter(self.elements)

def __contains__(self, value):
            return value in self.elements

def __len__(self):
            return len(self.elements)

s1 = ListBasedSet('abcdef')
    s2 = ListBasedSet('defghi')
    overlap = s1 & s2            # The __and__() method is supported automatically

Notes on using :class:`Set` and :class:`MutableSet` as a mixin:

(1)
   Since some set operations create new sets, the default mixin methods need
   a way to create new instances from an iterable. The class constructor is
   assumed to have a signature in the form ``ClassName(iterable)``.
   That assumption is factored-out to an internal classmethod called
   :meth:`_from_iterable` which calls ``cls(iterable)`` to produce a new set.
   If the :class:`Set` mixin is being used in a class with a different
   constructor signature, you will need to override :meth:`_from_iterable`
   with a classmethod or regular method that can construct new instances from
   an iterable argument.

(2)
   To override the comparisons (presumably for speed, as the
   semantics are fixed), redefine :meth:`__le__` and :meth:`__ge__`,
   then the other operations will automatically follow suit.

(3)
   The :class:`Set` mixin provides a :meth:`_hash` method to compute a hash value
   for the set; however, :meth:`__hash__` is not defined because not all sets
   are :term:`hashable` or immutable.  To add set hashability using mixins,
   inherit from both :meth:`Set` and :meth:`Hashable`, then define
   ``__hash__ = Set._hash``.

.. seealso::

* `OrderedSet recipe <https://code.activestate.com/recipes/576694/>`_ for an
     example built on :class:`MutableSet`.

* For more about ABCs, see the :mod:`abc` module and :pep:`3119`.