Permutations

[mikke3141]

Hi,

I'm new to Python and trying to learn the basics. How can I only show unique lists as a result so that if the list values are just in a different order to an already found result, it would not show it as one of the possible alternatives. So for example if the code has already found (1,2,3,4) as a results if would not show (4,3,2,1) as another result.

numlist = [1, 2, 3, 4, 5]
target_sum = 10

for length in range(2, len(numlist) + 1):
    perms = list(permutations(numlist, length))
    print("checking {} permutations of length {}".format(len(perms), length))
    for p in perms:
        s = sum(p)
        if s == int(target_sum):
            print("sum({}) = {}".format(list(p), sum(p)))

I appreciate your help.

[ichabod801]

It's not clear where you are getting your permutations function from. If you are getting it from itertools, use itertools.combinations instead. Otherwise show use the code for your permutations function.

[mikke3141]

Yes I was using itertools. Thank you for your help.