Iterating over indices in a list
Gerrit Holl
gerrit at nl.linux.org
Wed Feb 19 09:22:30 EST 2003
Joakim Hove schreef op woensdag 19 februari om 15:08:57 +0000:
>
>
> Hello all,
>
> I find my code quite often containing statements like this[*]:
>
> do index in (range(len(List))):
> if List[index]....
>
>
> Somewhere I stumbled over a new, and more elegant (based on iterators
> ?) alternative to this ugly construction, but now I can not find
> it. Any suggestions?
As of Python 2.3, you can do:
12 >>> for index, item in enumerate(string.lowercase):
12 ... print item, "is letter number", index, "in the alphabet!"
See also:
* http://www.python.org/doc/2.3a1/whatsnew/section-enumerate.html
* http://www.python.org/peps/pep-0279.html
* http://www.python.org/dev/doc/devel/lib/built-in-funcs.html#l2h-18
yours,
Gerrit.
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