tkinter.Event is typed as generic but implementation isn't subscriptable

[yowoda]

Implementation can be found here: https://github.com/python/cpython/blob/aa905925e1a0120e59e4ffe0874fbd098bf47e63/Lib/tkinter/__init__.py#L217

The stub:

typeshed/stdlib/tkinter/__init__.pyi

Line 241 in c54f16b

class Event(Generic[_W_co]):

Not sure if this is intended behaviour (I assume it isn't) but right now type checkers can only be satisfied if doing
from __future__ import annotations or putting tk.Event[...] in quotes

[srittau]

This is a common issue with type stubs and intended. We prefer to use generics if it improves type checking even if the implementation is not generic.

[Akuli]

CPython maintainers (I think Guido) have mentioned making tkinter.Event generic at runtime, but they never did it. Maybe you could submit a PR there? :)

The reason tkinter.Event is generic is that tkinter.Event[tkinter.Label] is an event coming from clicking (or otherwise interacting with) a tkinter.Label widget, and when you access event.widget, the type checker knows it is a label and acts accordingly.

[yowoda]

Sure, once I'm free the next few days I can definitely submit a PR