Weirdness comparing strings

Mr.SpOOn mr.spoon21 at gmail.com
Tue Sep 30 12:58:27 CEST 2008


On Tue, Sep 30, 2008 at 12:55 PM, Ken Seehart <ken at seehart.com> wrote:
> Instance comparison is not necessarily the same as string comparison.
>  Neither __str__ nor __repr__ are implicitly used at all for comparison.

Ok, I see.

> In fact, by default a pair of instances are not equal unless they are the
> same object.  To define comparison to mean something, you need to define
> __cmp__ or __eq__.
>
> Trivial example of default comparison:
>
>>>> class C:
> ...   pass
> ...
>>>> c = C()
>>>> d = C()
>>>> c==d
> False
>>>> c==c
> True

Thanks.

Almar Klein:
>but this does not implicitly convert self to a string. You'll have to
>do in explicitly:
>use "return str(self) == note" instead.

Yes, this works.
Thanks.



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