Ken Jin <kenjin4...@gmail.com> added the comment:
@Guido, I hope I didn't misunderstand you, but to clarify, what OP is asking is an alternative way to construct types.UnionType objects and write: types.UnionType[int, str] like how we used to write before 3.10: typing.Union[int, str] I don't know why we need this. We can write `int | str`. The reason for PEP 604 in the first place was to avoid the subscript syntax and use `|` since it's cleaner. OP's use case is for reconstructing types.UnionType objects easily, but `functools.reduce(operator.or_, args)` works. Re: TypeVar subscription; PEP 604 syntax already supports that. We used to implement that in C. After Serhiy's Great Cleanup, a bitwise OR with a TypeVar automatically converts types.UnionType to typing.Union. So all the TypeVar support is now done in Python. >>> type(int | str) <class 'types.UnionType'> >>> (int | str | T)[dict] typing.Union[int, str, dict] ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue45418> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
