On Mon, Jul 7, 2014, at 04:22, Andreas Maier wrote: > While discussing Python issue #12067 > (http://bugs.python.org/issue12067#msg222442), I learned that Python 3.4 > implements '==' and '!=' on the object type such that if no special > equality test operations are implemented in derived classes, there is a > default implementation that tests for identity (as opposed to equality > of the values). > > The relevant code is in function do_richcompare() in Objects/object.c. > > IMHO, that default implementation contradicts the definition that '==' > and '!=' test for equality of the values of an object. > > Python 2.x does not seem to have such a default implementation; == and > != raise an exception if attempted on objects that don't implement > equality in derived classes.
Why do you think that? % python Python 2.7.6 (default, May 29 2014, 22:22:15) [GCC 4.7.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> class x(object): pass ... >>> class y(object): pass ... >>> x != y True >>> x == y False _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
