What about using `(int, str)` for indicating a `Union`? This doesn't have compatibility issues and it's similar to `isinstance(foo, (int, str))`, so it should be fairly intuitive:
def bar(foo: (int, str) = 0): ... Also it's similar to `get_args(Union[int, str])`. _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/QEL35QYFF5KXSOE27C46NFHM5KDH3VMB/ Code of Conduct: http://python.org/psf/codeofconduct/