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 findsubsets(s, n): 
    return list(itertools.combinations(s, n)) 

def allsubsets(s) :
    a = []
    for x in range(1,len(s)+1):
        a.append(map(set,findsubsets(s,x)))      
    return a