Getting all combinations from a list using itertools

Question

I am working on a problem with project Euler and I need to get all combinations of adding int elements in a list,

from itertools import combinations
evenAbs = [12, 18, 20, 24, 30,36]
evenCombs =  sorted(([i+j for i,j in combinations(evenAbs, 2)]))

my problem is that I need the combinations to include 12+12 18+18 etc.. How can I do this?

falsetru · Accepted Answer · 2013-10-26 05:54:29Z

2

Use itertools.combinations_with_replacement:

>>> import itertools
>>> list(itertools.combinations_with_replacement([1,2,3], 2))
[(1, 1), (1, 2), (1, 3), (2, 2), (2, 3), (3, 3)]

answered Oct 26, 2013 at 5:54

falsetru

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1 Comment

Padraic Cunningham Over a year ago

thanks a million, my answer was a a couple of hundred off the correct answer, having not realized until after many hours that combinations did not add values to themselves, the combinations_with_replacement did exactly what I needed!

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