[issue41543] contextlib.nullcontext doesn't work with async context managers

[Tom Gringauz]

New submission from Tom Gringauz <tomgrin10 at gmail.com>:

`contextlib.nullcontext` cannot be used with async conetext managers, because it implements only `__enter__` and `__exit__`, and doesn't implement `__aenter__` and `__aexit__`.

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components: Library (Lib), asyncio
messages: 375346
nosy: asvetlov, tomgrin10, yselivanov
priority: normal
severity: normal
status: open
title: contextlib.nullcontext doesn't work with async context managers
type: enhancement

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41543>
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