Add missing generic on Factory subclasses

[Viicos]

Following #1059, subclasses were missing the type var, making it impossible to parametrize at runtime.

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There's a couple places where I'd like to see typing added (e.g. LazyAttribute and friends' callables arguments). They should be pretty straightforward, would you like to have a PR implementing it?

[rbarrois]

Thanks for catching that!

That's a good point for the abstract factories; for the concrete ones (StubFactory, ListFactory, DictFactory), I believe we should use the actual class instead of the typevar'd.

Finally, would you be able to add a couple of tests in tests/test_typing.py? Those are exercised through make test as the first check.

Thanks!

[Viicos]

Good catch on concrete factories. I updated tests to make use of assert_type, which is more convenient when dealing with type tests

[rbarrois]

I add tried to use assert_type as well, however it is only available from Python 3.11 — hence the typing tests with mypy :)

[Viicos]

Yes this is why I added typing_extensions as a tox dependency

[Viicos]

Hi @rbarrois, any chance we could get a release once this is merged? The typing addition from the previous PR would be really useful in test code as it really plays well in IDEs :) Thanks!

[foarsitter]

Is it required to create a new TypeVar here? Can't we import it from base.py or user base.T? The same applies todjango.py and mogo.py.

[IAL32]

Hey there 😄 we use FactoryBoy quite a lot at Tacto. Since this PR has been open for quite some time, I just worked on top of it to see if we can get it merged soon. This is why I opened another PR: #1100 that basically works on top of this PR and the existing comments.

I'll look into other issues that we saw so far with typing with mypy, and see if I can address them ;) looking forward!