Add contextlib.AsyncContextDecorator

[lancelote]

Yet another Python 3.10 addition - AsyncContextDecorator.

Links

• Documentation: contextlib.AsyncContextDecorator
• bpo-40816: Add missed AsyncContextDecorator to contextlib
• PR bpo-40816 Add AsyncContextDecorator class cpython#20516: Add AsyncContextDecorator class

Async Function Annotation

I wasn't sure how to properly type annotate the func parameter. In the end, I followed

• Document how to type hint for an async function used as a callback typing#424: Document how to type hint for an async function used as a callback

• typeshed/stdlib/contextlib.pyi

  Line 91 in 33ea648

  _CallbackCoroFunc = Callable[..., Awaitable[Any]]

ContextDecorator

Existing ContextDecorator annotation for comparison

_F = TypeVar("_F", bound=Callable[..., Any])
class ContextDecorator:
    def __call__(self, func: _F) -> _F: ...

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[JelleZijlstra]

Thanks!