On 26/01/2007 17.03, Thomas Wouters wrote: > How critical is the 'numeric' property of the nb_hash function? I > can certainly honour it, but is it worth it? > > [...] > There's no strict requirement that > equal objects must have equal hashes,
Uh? I thought that was the *only* strict requirement of hash. In fact the docs agree: ==================================================== __hash__( self) Called for the key object for dictionary operations, and by the built-in function hash(). Should return a 32-bit integer usable as a hash value for dictionary operations. The only required property is that objects which compare equal have the same hash value; [...] ==================================================== I personally consider *very* important that hash(5.0) == hash(5) (and that 5.0 == 5, of course). -- Giovanni Bajo _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
