How to get all possible combinations of three lists

Question

I have three lists:

list_a=[1,2]
list_b=[3,4]
list_c=[5,6]

Now i'm looking for a solution in python by using a loop where a new list iterates through all possible combinations of these three lists (the order is not important):

new_list = list_a # -> [1,2]
new_list = list_b # -> [3,4]
new_list = list_c # -> [5,6]
new_list = list_a + list_b # -> [1,2,3,4]
new_list = list_b + list_c # -> [3,4,5,6]
new_list = list_a + list_c # -> [1,2,5,6]
new_list = List_a + list_b + list_c # -> [1,2,3,4,5,6]

I found some similar posts with "itertools" or nested loops, but nothing exactly like this...

Answer 1

You can use itertools:

from itertools import combinations, chain

out = [list(chain.from_iterable(l)) 
          for i in range(3) 
          for l in combinations([list_a, list_b, list_c], i+1)]

# Output
[[1, 2],
 [3, 4],
 [5, 6],
 [1, 2, 3, 4],
 [1, 2, 5, 6],
 [3, 4, 5, 6],
 [1, 2, 3, 4, 5, 6]]