typing.ContextManager --- warned against but unactionable?

Hi @leycec , sorry to bother you again.

I am one to treat warnings as errors, and thus PEP 484/585 require me to make migrations of the form

from typing import Hashable

to

from collections.abc import Hashable

However, there appears not to be an analogue of typing.ContextManager. Accordingly, what do I do in this situation?

Here’s a minimal example:

from contextlib import contextmanager
from collections.abc import Iterator
from typing import ContextManager
from warnings import filterwarnings, simplefilter
from beartype import beartype

filterwarnings("error")


@contextmanager
@beartype
def foo() -> Iterator[None]:
    yield


f = foo()
print("\n\n\nfoo is correctly typed: {}\n\n\n".format(f))


@beartype
def bar(cm: ContextManager[None]) -> None:
    pass


bar(f)
print("did not get here")

resulting in:

> python foo.py



foo is correctly typed: <contextlib._GeneratorContextManager object at 0x7f3104e4d3a0>



Traceback (most recent call last):
   <snip>
    warn(
beartype.roar.BeartypeDecorHintPep585DeprecationWarning: PEP 484 type hint typing.ContextManag
er[NoneType] deprecated by PEP 585 scheduled for removal in the first Python version released
after October 5th, 2025. To resolve this, either drop Python < 3.9 support and globally replac
e this hint by the equivalent PEP 585 type hint (e.g., "typing.List[int]" by "list[int]") or s
ee this discussion topic for saner and more portable solutions:
    https://github.com/beartype/beartype#pep-484-deprecations

[dycw]

Ahh, thanks guys for the help. I could’ve sworn I did a poor man’s grep (a.k.a., Ctrl-F) for ContextManager, but somehow that went wrong. In any case, onward with the @beartypeing!

> rg "@beartype" --stats

2360 matches
2360 matched lines
193 files contained matches
3731 files searched
49746 bytes printed
101142793 bytes searched
0.053398 seconds spent searching
0.031693 seconds

[leycec]

…sniped by Spence. Remind me never to foolishly engage in a vicious eBay bidding war over Portal memorabilia with you, Spence. That is the day I would surely lose everything.