How to get all subsets of a set? (powerset)

Question

Given a set

{0, 1, 2, 3}

How can I produce the subsets:

[set(),
 {0},
 {1},
 {2},
 {3},
 {0, 1},
 {0, 2},
 {0, 3},
 {1, 2}         


        

Answer 1

def get_power_set(s):
  power_set=[[]]
  for elem in s:
    # iterate over the sub sets so far
    for sub_set in power_set:
      # add a new subset consisting of the subset at hand added elem
      power_set=power_set+[list(sub_set)+[elem]]
  return power_set

For example:

get_power_set([1,2,3])

yield

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