Antoine Pitrou <pit...@free.fr> added the comment: > I see the type check of the 'other' object as an operation towards the > equal comparison, since it validates wether 'self' and 'other' can be > equal at all. If they are of a different type, then they cannot be > equal, thus the anwser to "Are 'self' and 'other' equal?" should be > False. This again, would mean an equal operation is implemented and > returning NotImplemented is not the right anwser.
The explanation for NotImplemented is that an user-defined class may decide it can compare equal to a WeakSet (without inheriting from WeakSet). Returning NotImplemented from WeakSet.__eq__ gives a chance to the user-defined class' __eq__ method to be called. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5964> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
