Make types classes that are generic at type time subscriptable at runtime

[Gobot1234]

Feature or enhancement

Proposal:

coroutine and generator should be subscriptable at runtime as they already are at type time

>>> import types
>>> types.CoroutineType[None, None, int]
TypeError: type 'coroutine' is not subscriptable

https://github.com/python/typeshed/blob/31916d1e0c4c213cac031e2a448e5531206e3ab4/stdlib/types.pyi#L402

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

python/typing#1480 is where this stemmed from

Linked PRs

• gh-110209: Add __class_getitem__ for generator and coroutine #110212