Python MeanGroups (A):
def meanGroups(a):
d = []
e = []
for i, j in enumerate(a):
if sum(j) / len(j) not in e:
e += [sum(j) / len(j)]
d += [[i]]
else:
d[e.index(sum(j) / len(j))] += [i]
return d
lost_cause