字典排序与多标签排序

a = {
    1: (10, 20, 1),
    10: (10, 1, 2),
    11: (20, 20, 3),
    8: (20, 2, 4),
}

print(sorted(a))  # sort the keys
print(sorted(a.items(), key=lambda t: t[1]))  # sort by values
print(sorted(a.items(), key=lambda t: t[1][0]))  # sort by v[0]
print(sorted(a.items(), key=lambda t: t[1][1:]))  # sort by v[1],v[2]

[1, 8, 10, 11]
[(10, (10, 1, 2)), (1, (10, 20, 1)), (8, (20, 2, 4)), (11, (20, 20, 3))]
[(1, (10, 20, 1)), (10, (10, 1, 2)), (11, (20, 20, 3)), (8, (20, 2, 4))]
[(10, (10, 1, 2)), (8, (20, 2, 4)), (1, (10, 20, 1)), (11, (20, 20, 3))]