Determinig position of a element in a list

Bob Gailer bgailer at alum.rpi.edu
Tue Aug 26 00:58:34 CEST 2003


At 12:29 AM 8/26/2003 +0200, Przemo Drochomirecki wrote:

>Hello,
>i'm wondering if there is any tricky way for doing following thing:
>     A - list of distinct integers  (e.x. A = [1,3,7,11,14,15])
>     very fast function determinig position of number x in list A
>     or -1 if x doesnt belong to A
>Operator IN returns only false/true values
>i can implement function index (e.x. index(5,A) = -1, index(7,A) = 2), but
>maybe there's is simpler(builtin?) solution

try: pos = A.index(5) # or whatever number you want
except ValueError: pos = -1

Bob Gailer
bgailer at alum.rpi.edu
303 442 2625
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