子集合

 from itertools import combinations

d = [1,2,3]

dl = []

for i in range(len(d)+1):

cs = list(combinations(d,i))

for j in cs:

dl.append(j)

for i in dl:

print(','.join(map(str,i)))

1

2

3

1,2

1,3

2,3

1,2,3