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Date: Fri, 25 Jan 2013 18:56:14 -0500
From: Dave Angel <d@davea.name>
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Subject: Re: Retrieving an object from a set
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On 01/25/2013 06:14 PM, Arnaud Delobelle wrote:
> Dear Pythoneers,
>
> I've got a seemingly simple problem, but for which I cannot find a
> simple solution.
>
> I have a set of objects (say S) containing an object which is equal to
> a given object (say x). So
>
>      x in S
>
> is true.  So there is an object y in S which is equal to x.  My
> problem is how to retrieve y, without going through the whole set.
> Here is a simple illustration with tuples (my actual scenario is not
> with tuples but with a custom class):
>
>>>> y = (1, 2, 3) # This is the 'hidden object'
>>>> S = set([y] + range(10000))
>>>> x = (1, 2, 3)
>>>> x in S
> True
>>>> x is y
> False
>
> I haven't found y.

Baloney.  You've got the item y which is equal to x, not identical to x. 
  So just what did you expect?  "is" is the wrong comparator.

What exactly is your problem?


-- 
DaveA