make all possible combinations of lists

Dean:

I need to be able to create a list containing all possible combinations of input lists. For example, a list [1,2,3]should return [1 [1,2] [1,3] 2 [2,3] 3 [1,2,3]]the list does not have to be in any particular order. On this site I found many functions that are used, itertoolsbut when I only need one these functions return objects list.

Oscar López:

Just use . E.g:itertools.combinations

import itertools

lst = [1, 2, 3]
combs = []

for i in xrange(1, len(lst)+1):
    combs.append(i)
    els = [list(x) for x in itertools.combinations(lst, i)]
    combs.append(els)

Keep this value for now :combs

[1, [[1], [2], [3]], 2, [[1, 2], [1, 3], [2, 3]], 3, [[1, 2, 3]]]

Yes, it's slightly different from the example output you provided, but in that output you don't list all possible combinations.

I listed the combined sizes before the actual list of each size, if all you need is the combined (no size, as in the example output), then try a different version of the code:

import itertools

lst = [1, 2, 3]
combs = []

for i in xrange(1, len(lst)+1):
    els = [list(x) for x in itertools.combinations(lst, i)]
    combs.extend(els)

Keep this value for now :combs

[[1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3]]

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