ADD: types for ExtensionFileLoader (#4769)

[hardikpnsp]

Issues #4769

Changes

• Added missing methods mentioned in ExtensionFileLoader docs

Notes

• In return type of create_module, I have added None because I think in create_module the internal _imp.create_dynamic can return NULL but I am not completely sure about it.

[JelleZijlstra]

Returning NULL in C means throwing an exception, not returning None (you'd see Py_RETURN_NONE for that).

Also, thanks for your PR!

[hardikpnsp]

Returning NULL in C means throwing an exception, not returning None (you'd see Py_RETURN_NONE for that).

I see! Thanks for your feedback. I don't see Py_RETURN_NONE macro anywhere in that function. I will remove None in a subsequent commit.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[srittau]

Thanks!