python3.6+版本中，dict的键值保持插入有序。
1 t = list(range(10)) 2 b = t[:] 3 d = dict(zip(t, b)) 4 print(list(d.items()))
1 [(0, 0), (1, 1), (2, 2), (3, 3), (4, 4), (5, 5), (6, 6), (7, 7), (8, 8), (9, 9)]
