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gh-127949: make deprecation of policy system more prominent by kumaraditya303 · Pull Request #128290 · python/cpython · GitHub

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27 changes: 26 additions & 1 deletion Doc/deprecations/pending-removal-in-3.16.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -19,10 +19,35 @@ Pending removal in Python 3.16
* :mod:`asyncio`:

* :func:`!asyncio.iscoroutinefunction` is deprecated
and will be removed in Python 3.16,
and will be removed in Python 3.16;
use :func:`inspect.iscoroutinefunction` instead.
(Contributed by Jiahao Li and Kumar Aditya in :gh:`122875`.)

* :mod:`asyncio` policy system is deprecated and will be removed in Python 3.16.
In particular, the following classes and functions are deprecated:

* :class:`asyncio.AbstractEventLoopPolicy`
* :class:`asyncio.DefaultEventLoopPolicy`
* :class:`asyncio.WindowsSelectorEventLoopPolicy`
* :class:`asyncio.WindowsProactorEventLoopPolicy`
* :func:`asyncio.get_event_loop_policy`
* :func:`asyncio.set_event_loop_policy`
* :func:`asyncio.set_event_loop`

Users should use :func:`asyncio.run` or :class:`asyncio.Runner` with
*loop_factory* to use the desired event loop implementation.

For example, to use :class:`asyncio.SelectorEventLoop` on Windows::

import asyncio

async def main():
...

asyncio.run(main(), loop_factory=asyncio.SelectorEventLoop)

(Contributed by Kumar Aditya in :gh:`127949`.)

* :mod:`builtins`:

* Bitwise inversion on boolean types, ``~True`` or ``~False``
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16 changes: 11 additions & 5 deletions Doc/library/asyncio-eventloop.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,13 @@ an event loop:
.. versionchanged:: 3.14
Raises a :exc:`RuntimeError` if there is no current event loop.

.. note::

The :mod:`!asyncio` policy system is deprecated and will be removed
in Python 3.16; from there on, this function will always return the
running event loop.


.. function:: set_event_loop(loop)

Set *loop* as the current event loop for the current OS thread.
Expand Down Expand Up @@ -1781,12 +1788,11 @@ By default asyncio is configured to use :class:`EventLoop`.
import asyncio
import selectors

class MyPolicy(asyncio.DefaultEventLoopPolicy):
def new_event_loop(self):
selector = selectors.SelectSelector()
return asyncio.SelectorEventLoop(selector)
async def main():
...

asyncio.set_event_loop_policy(MyPolicy())
loop_factory = lambda: asyncio.SelectorEventLoop(selectors.SelectSelector())
asyncio.run(main(), loop_factory=loop_factory)


.. availability:: Unix, Windows.
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6 changes: 6 additions & 0 deletions Doc/library/asyncio-runner.rst
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Expand Up @@ -76,6 +76,12 @@ Running an asyncio Program

*coro* can be any awaitable object.

.. note::

The :mod:`!asyncio` policy system is deprecated and will be removed
in Python 3.16; from there on, an explicit *loop_factory* is needed
to configure the event loop.


Runner context manager
======================
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