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=============
ABC-Backports
=============
Usage:
.. code-block:: python
try:
# ABCs live in "collections.abc" in Python >= 3.3
from collections.abc import Coroutine, Generator
except ImportError:
# fall back to import from "backports_abc"
from backports_abc import Coroutine, Generator
You can also install the ABCs into the stdlib by calling the ``patch()``
function:
.. code-block:: python
import backports_abc
backports_abc.patch()
try:
# ABCs live in "collections.abc" in Python >= 3.3
from collections.abc import Coroutine, Generator
except ImportError:
# fall back to import from "collections" in Python <= 3.2
from backports_abc import Coroutine, Generator
Currently, ``patch()`` provides the following names if missing:
* ``collections.abc.Generator``
* ``collections.abc.Awaitable``
* ``collections.abc.Coroutine``
* ``inspect.isawaitable(obj)``
All of them are also available directly from the ``backports_abc``
module namespace.
In Python 2.x and Python 3.2, it patches the ``collections`` module
instead of the ``collections.abc`` module. Any names that are already
available when importing this module will not be overwritten.
The names that were previously patched by ``patch()`` can be queried
through the mapping in ``backports_abc.PATCHED``.
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