Inherited Pause in screenpy-selenium has errors in mypy

[MarcelWilson]

screenp-selenium has a Pause class that inherits screenpy.actions.pause.Pause.

mypy will error on the following code from screenpy-selenium

Pause.for_(length).seconds_because("... reasons").add_to_chain(tester, chain)

"Pause" has not attribute "add_to_chain" [attr-defined]

[MarcelWilson]

The problem exists for any baseclass that annotates itself as the object returned by a method.
The easy solution to this would be to create TypeVars for each baseclass that would potentially be inherited.

[MarcelWilson]

See Mypy docs for more details about how TypeVar is used.

[MarcelWilson]

PEP 673 was accepted and is included in 3.11 but mypy still hasn't merged the update to support checking it. I'm proposing we add TypeVar now and when python/mypy#11666 eventually releases I'll update the package to utilize Self

[perrygoy]

Thanks to @bandophahita's hard work, this issue has been resolved!