python经常使用的几个功能/模块

1 求list的子集 import itertools # 有序 print(list(itertools.permutations([1, 2, 3, 4], 2))) # [(1, 2), (1, 3), (1, 4), (2, 1), (2, 3), (2, 4), (3, 1), (3, 2), (3, 4), (4, 1), (4, 2), (4, 3)] # 无序 print(li

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