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bpo-42140: Improve asyncio.wait function (GH-22938)

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GH- Improve asyncio.wait function

The original code creates the futures set two times.
We can create this set before, avoiding the second creation.

This new behaviour [breaks the aiokafka library](https://github.com/aio-libs/aiokafka/pull/672), because it gives an iterator to that function, so the second iteration become empty.

Automerge-Triggered-By: GH:1st1
(cherry picked from commit 7e5ef0a571)

Co-authored-by: Diogo Dutra <diogodutradamata@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-11-10 15:10:57 -08:00 • committed by GitHub
parent f8bea0a44d
commit 33922cb0aa
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3 changed files with 29 additions and 2 deletions
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6
Lib/asyncio/tasks.py
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@ -400,13 +400,15 @@ async def wait(fs, *, loop=None, timeout=None, return_when=ALL_COMPLETED):
"and scheduled for removal in Python 3.10.",
DeprecationWarning, stacklevel=2)
if any(coroutines.iscoroutine(f) for f in set(fs)):
fs = set(fs)
if any(coroutines.iscoroutine(f) for f in fs):
warnings.warn("The explicit passing of coroutine objects to "
"asyncio.wait() is deprecated since Python 3.8, and "
"scheduled for removal in Python 3.11.",
DeprecationWarning, stacklevel=2)
fs = {ensure_future(f, loop=loop) for f in set(fs)}
fs = {ensure_future(f, loop=loop) for f in fs}
return await _wait(fs, timeout, return_when, loop)