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Mon Sep 28 16:57:14 CEST 2009 · http://mail.python.org/pipermail/python-dev/2009-September/092224.html

Dj Gilcrease <digitalxero <at> gmail.com> writes:
> 
> >>> net1 = IPNetwork("10.1.2.3/24")
> >>> net2 = IPNetwork("10.1.2.0/24")
> >>> print hash(net1) == hash(net2)
> False
> >>> print net1 == net2
> True

Ouch :-)
It is very bad practice for equal objects to hash differently. Differing hashes
are supposed to imply non-equal objects, so as to allow the implementation of
associative containers with good performance characteristics.

Regards

Antoine.

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[Python-Dev] PEP 3144 review.