python meangroups 28a 29 3a

1def meanGroups(a):
2    d = []
3    e = []
4    for i, j in enumerate(a):
5        if sum(j) / len(j) not in e:
6            e += [sum(j) / len(j)]
7            d += [[i]]
8        else:
9            d[e.index(sum(j) / len(j))] += [i]
10    return d
11