> Martin v. Löwis wrote:
>> If you want the set of keys of a dictionary d, then do set(d):
>> >>> d={1:2,3:4}
>> >>> set(d)
>> set([1, 3])
>
> I know. But this does not answer the question: If the keys *are* already
> a set according to their semantics, why aren't they returned as a set
> from the beginning?
Sorry. Your answer was good; I missed the point and thought you wrote
set(d.keys()). Is it documented anywhere that set(d) = set(d.keys())? I
think this should go into the Python Doco where keys() are explained.
I would have expected that set(d) returns set(d.items()), but as has
been discussed, this would cause problems with mutable values.
-- Christoph
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