how to divide a list to two lists and get all possible combinations

Question

I have a list:

list1 = [1,2,3]

and I want to dived it to two list such that:

list2 = [[], [1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3]]
list3 = [[1,2,3], [2,3], [1, 3], [1, 2] ,[3], [2], [1], []]

I tried different loops but didn't get all combinations and I thought maybe there is an elegant way instead.

Check the `itertools` documentation for the `powerset` recipe. — chepner, Feb 11 '21 at 21:33
See this https://stackoverflow.com/questions/40709488/all-possibilities-to-split-a-list-into-two-lists and https://www.geeksforgeeks.org/python-program-to-get-all-unique-combinations-of-two-lists/ — I_Al-thamary, Feb 11 '21 at 21:33

score 1 · Answer 1 · answered Feb 11 '21 at 21:40

1

Perhaps using itertools.

import itertools

list2 = []
for i in range(4):
    for j in itertools.combinations([1,2,3], r=i):
        list2.append( list(j) )

the output

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

answered Feb 11 '21 at 21:40

danuzco

1 Answers1