Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
There are two ways to fix the larger issue. 1. Make issubclass(types.GenericAlias, type) returning True, and also make isinstance(typing.List[int], type) returning True and issubclass(typing._GenericAlias, type) returning True, and analyze every place in the interpreter and the stdlib which calls isinstance(..., type) or issubclass(..., type) and ensure that they work with types.GenericAlias and typing._GenericAlias and their instances as well as with ordinary types, fix them and add tests for them. And perhaps do the same for types.UnionType, typing._UnionGenericAlias, typing.TypeVar, typing.NewType, etc, etc. 2. Make isinstance(list[int], type) returning False. It would be nice to ad also tests for the same cases as in option 1, but it is not so urgent, and I expect that in most cases the current behavior which matches the status quo is expected. I tried to implement option 1, but it is just too much places, so it would take a large amount of time which I do not have right now. First than invest my time in this I want to make sure which option is desirable in long term. Guido, Ivan, Ken Jin, what would you say? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue45438> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
