Double for loop in python

Question

I try to program now in pythonic. I have next case - some array, which elements I want to iterate with each others... At the moment I coded next example:

a = ['a','b','c','d','e','f']

for posx in range(len(a)):
    for posy in range(posx+1, len(a)):
                *some operation for these elements*

Now I want to ask some experience Pyhton users, how I can reduce such slow for'loops? Is it possible to use here ziptool? How I could understand, zip just connect two elements on the same position in two difeerent lists (or arrays). I want to iterate one list over another and get back the operation for every element in both lists.

Thanks a lot

user2357112 · Accepted Answer · 2014-07-28 06:58:15Z

3

This is available in the standard library as itertools.combinations:

import itertools

for elem1, elem2 in itertools.combinations(a, 2):
    do_whatever_with(elem1, elem2)

answered Jul 28, 2014 at 6:58

user2357112

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1 Comment

Guforu Over a year ago

Thank you, exactly answer. Accepted

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