[Python-Dev] PEP 276 (simple iterator for ints)
Delaney, Timothy C (Timothy)
tdelaney at avaya.com
Mon Jul 5 01:31:10 CEST 2004
Andrew Koenig wrote:
> for i in myList.keys():
>
> would be even better, because it allow the same usage for dict and
> list. Of course that wouldn't generalize to other sequences that
> support len.
Hmm - time to propose a new builtin (can't remember this being proposed
before, though I know we've discussed adding keys() to lists).
keys(mapping)
Returns an iterator of the keys of the mapping. For any sequence that
implements __len__, returns an iterator of the integers 0..__len__. For
any object that implements keys() or iterkeys(), returns the appropriate
iterator.
I would also suggest that __keys__ might be a useful magic method.
There might be a use for values(mapping) as well, but I don't think it's
as useful.
Tim Delaney
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