Jack Diederich <jackd...@gmail.com> added the comment: This is a change in the codepath for instances that don't have __class__ defined. subclass = getattr(instance, '__class__', None) - if subclass in cls._abc_cache: + if subclass is not None and subclass in cls._abc_cache:
I think the same thing happens in either case (from visual inspection of the code) but I'd rather not change it if we don't need to. ---------- nosy: +jackdied _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue2521> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com