En Sat, 20 Jun 2009 12:50:41 -0300, Gustavo Narea <m...@gustavonarea.net>
escribió:
Thank you very much for your responses. You guessed right, I didn't
use the __hash__ method (and I forgot to mention that, sorry).
And unfortunately, I think I can't make them hashable, because the
objects are compared based on their attributes, which are in turn
other kind of objects compared based on other attributes. All these
class instances are compared with __eq__/__ne__ and they wrap
relatively complex data which would be hard to attempt to represent
them unambiguously using a 32-bit integer. That's why I'm afraid I
cannot use hashables.
Combine the hash values of whatever objects are involved in __eq__ but
make sure they cannot change (in that case the hash value would be
invalid).
No need for hash to be unambiguous - objects that compare equal must have
the same hash value, but objects with the same hash value may be different.
--
Gabriel Genellina
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