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bpo-42392: Mention loop removal in whatsnew for 3.10 (GH-24256)

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@vstinner [noticed on python-dev](https://mail.python.org/archives/list/python-dev@python.org/thread/O3T7SK3BGMFWMLCQXDODZJSBL42AUWTR/) that there is no what's new or porting entry for removal of asyncio ``loop`` parameter. 

This patch adds a basic guide.

Co-Authored-By: Kyle Stanley <aeros167@gmail.com>
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Ken Jin 2021-01-20 16:16:12 -08:00 • committed by GitHub
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37
Doc/whatsnew/3.10.rst
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@ -558,6 +558,23 @@ Removed
the :mod:`collections` module.
(Contributed by Victor Stinner in :issue:`37324`.)
* The ``loop`` parameter has been removed from most of :mod:`asyncio`\ 's
:doc:`high-level API <../library/asyncio-api-index>` following deprecation
in Python 3.8. The motivation behind this change is multifold:
1. This simplifies the high-level API.
2. The functions in the high-level API have been implicitly getting the
current thread's running event loop since Python 3.7. There isn't a need to
pass the event loop to the API in most normal use cases.
3. Event loop passing is error-prone especially when dealing with loops
running in different threads.
Note that the low-level API will still accept ``loop``.
See `Changes in the Python API`_ for examples of how to replace existing code.
(Contributed by Yurii Karabas, Andrew Svetlov, Yury Selivanov and Kyle Stanley
in :issue:`42392`.)
Porting to Python 3.10
======================
@ -596,6 +613,26 @@ Changes in the Python API
a 16-bit unsigned integer.
(Contributed by Erlend E. Aasland in :issue:`42393`.)
* The ``loop`` parameter has been removed from most of :mod:`asyncio`\ 's
:doc:`high-level API <../library/asyncio-api-index>` following deprecation
in Python 3.8.
A coroutine that currently look like this::
async def foo(loop):
await asyncio.sleep(1, loop=loop)
Should be replaced with this::
async def foo():
await asyncio.sleep(1)
If ``foo()`` was specifically designed *not* to run in the current thread's
running event loop (e.g. running in another thread's event loop), consider
using :func:`asyncio.run_coroutine_threadsafe` instead.
(Contributed by Yurii Karabas, Andrew Svetlov, Yury Selivanov and Kyle Stanley
in :issue:`42392`.)
CPython bytecode changes
========================