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Sat Apr 4 01:18:22 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-April/088181.html

On Fri, Apr 3, 2009 at 8:07 AM, Hrvoje Niksic <hrvoje.niksic at avl.com> wrote:
> But I can't seem to find a way to retrieve the element corresponding to
> 'foo', at least not without iterating over the entire set.  Is this an
> oversight or an intentional feature?  Or am I just missing an obvious way to
> do this?

>>> query_obj in s
True
>>> s_prime = s.copy()
>>> s_prime.discard(query_obj)
>>> x = s.difference(s_prime).pop()

Pretty ugly, but I think it only uses a shallow copy, and it might be
a bit better than iterating, if difference is intelligent.  I haven't
run any tests though.

-- 
Cheers,
Leif

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[Python-Dev] Getting values stored inside sets