Is 'everything' a refrence or isn't it?

Bengt Richter bokr at oz.net
Mon Jan 16 11:34:40 CET 2006


On 15 Jan 2006 13:50:14 -0800, Paul Rubin <http://phr.cx@NOSPAM.invalid> wrote:

>Mike Meyer <mwm at mired.org> writes:
>> > I'd say a==b doesn't necessarily mean a and b have the same value.
>> Care to say what it does mean (as opposed to what it doesn't mean), then?
>
>a==b simply means that a.__eq__(b) returns True.  
That's one possibility, but I guess __eq__ might not necessarily
even have to be defined (too lazy to set up the new-style class test ;-):

 >>> class A:
 ...     def __getattr__(self, attr): print 'A().%s'%attr; raise AttributeError
 ...
 >>> class B:
 ...     def __getattr__(self, attr): print 'B().%s'%attr; raise AttributeError
 ...
 >>> A()==B()
 A().__eq__
 B().__eq__
 B().__eq__
 A().__eq__
 A().__coerce__
 B().__coerce__
 A().__cmp__
 B().__cmp__
 False

Regards,
Bengt Richter



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