[Python-Dev] Python's C interface for types

[Aahz]

On Fri, Jan 26, 2007, Giovanni Bajo wrote:
> On 26/01/2007 17.03, Thomas Wouters wrote:
>> 
>> 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; [...]
> ====================================================

Possibly the docs should be updated, but this is only intended to apply
to objects of the same type.

> I personally consider *very* important that hash(5.0) == hash(5) (and
> that 5.0 == 5, of course).

Well, sure, but That's Different.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"I disrespectfully agree."  --SJM