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Showing content from https://mail.python.org/pipermail/python-dev/2002-December/031473.html below:

[Python-Dev] 'unhashable type' and new style classes

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On maandag, dec 30, 2002, at 17:30 Europe/Amsterdam, Guido van Rossum 
wrote:
> The default implementation of __hash__ must match the default
> implementation of __cmp__ (and rich comparisons, __eq__ etc.).  So the
> default implementation cannot raise an exception, because objects are
> defined to be immutable by default.  (Maybe this was a mistake, but
> it's not so easy to change without causing backwards
> incompatibilities.)

Is it an option to enforce that these methods are overridden together, 
then? I.e. if you override any of them you must override all of them, 
otherwise you get a warning?
--
- Jack Jansen        <Jack.Jansen@oratrix.com>        
http://www.cwi.nl/~jack -
- If I can't dance I don't want to be part of your revolution -- Emma 
Goldman -

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