Currently, we have: >>> [].append == [].append False
However, with a Python class: >>> class List(list): ... def append(self, x): super().append(x) >>> List().append == List().append TrueIn the former case, __self__ is compared using "is" and in the latter case, it is compared using "==". I think that comparing using "==" is the right thing to do because "is" is really an implementation detail. Consider
>>> (10000).bit_length == (10000).bit_length True >>> (10000).bit_length == (10000+0).bit_length FalseI guess that's also the reason why CPython internally rarely uses "is" for comparisons.
See also: - https://bugs.python.org/issue1617161 - https://bugs.python.org/issue33925 Any opinions? Jeroen. _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com