[Python-ideas] Implement comparison operators for range objects

[shibturn]

On 13/10/2011 6:30pm, Guido van Rossum wrote:
> (Note: __hash__ needs to create equivalence classes that are proper
> extensions of those created by __eq__. In terms of the Wikipedia
> picture, an extension is allowed to merge some equivalence classes but
> not to split them.)

Actually cpython's dict lookup does not check equivalence of keys using 
__eq__ directly.  Instead it uses something similar to

   def eq(a, b):
     return a.__hash__() == b.__hash__() and a.__eq__(b)

This ensures compatibility with the equivalence classes for __hash__. 
(It is also an optimisation.)

Cheers,
sbt