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Showing content from https://mail.python.org/pipermail/python-dev/2008-April/078434.html below:

[Python-Dev] __eq__ vs hash

[Python-Dev] __eq__ vs hash [Python-Dev] __eq__ vs hashPaul Moore p.f.moore at gmail.com
Fri Apr 4 18:30:57 CEST 2008 
On 04/04/2008, Guido van Rossum <guido at python.org> wrote:
>  >  It doesn't use __hash__ at all.  It uses __eq__ in two files, three total uses:
>  >  http://hg.intevation.org/mercurial/crew/file/6c4e12682fb9/mercurial/commands.py
>  >  http://hg.intevation.org/mercurial/crew/file/6c4e12682fb9/mercurial/context.py
>
>
> If it breaks, perhaps the instances of one of those classes that
>  define __eq__ but not __hash__ are used in a set or as dict keys?
>  That's the difference between 2.5 and 2.6 in this area.

That looks like it. I'll work up a patch and submit it to the
Mercurial developers.

Paul.
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