Guido van Rossum added the comment: Simpler repro:
from collections import UserList from typing import Sequence class MyList(UserList, Sequence): pass isinstance(None, Sequence) No progress yet in understanding. :-( ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27014> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com