Pekka Klärck <pekka.kla...@gmail.com> added the comment: Thanks for the PEP-560 reference. It explains the reasoning for the underlying changes, performance, and also mentions backwards incompatibility problems, including `issubclass(List[int], List)` causing a TypeError. It doesn't mention that `issubclass(List, list)` also raises a TypeError, though, nor that `isinstance(List, type)` now returns False.
I understand changing the implementation for performance reason, but I don't understand why that would require changing the behavior of `isinstance` and `issubclass`. The PEP explicitly mentions that the new `types.resolved_base` isn't called by them without explaining why. I guess that could be for performance reasons, but even then types in the typing could themselves implement `__instancecheck__` and `__subclasscheck__` and retain the old behavior. Or is there some actual reason for changing the behavior? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue34568> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
