Nick Coghlan <ncogh...@gmail.com> added the comment:
Ouch, you're right - I forgot that dict just returned NotImplemented from comparisons and unions and made it the other operand's problem: >>> d1 = dict(x=1) >>> d2 = dict(x=1) >>> from types import MappingProxyType as proxy >>> d1.__eq__(proxy(d2)) NotImplemented >>> d1.__or__(proxy(d2)) NotImplemented Perhaps we could mitigate the performance hit by skipping the copy when the other side is either a builtin dict (subclasses don't count), or a proxy around a builtin dict? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue43838> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
