Christian Heimes added the comment: __instancecheck__ contains unnecessary code. If we restrict ABCs to new style classes we could make the function faster:
Old: def __instancecheck__(cls, instance): """Override for isinstance(instance, cls).""" return any(cls.__subclasscheck__(c) for c in {instance.__class__, type(instance)}) New: def __instancecheck__(cls, instance): """Override for isinstance(instance, cls).""" # safe a function call for common case if instance.__class__ in cls._abc_cache: return True return cls.__subclasscheck__(instance.__class__) ---------- assignee: -> gvanrossum nosy: +gvanrossum __________________________________ Tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue1762> __________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com