• 排列组合

items = ['a', 'b', 'c']from itertools import permutationsfor p in permutations(items):    print(p)for p in permutations(items, 2):    print(p)from itertools import combinationsfor c in combinations(items, 3):    print(c)for c in combinations(items, 2):    print(c)for c in combinations(items, 1):    print(c)from itertools import combinations_with_replacementfor c in combinations_with_replacement(items, 3):    print(c)

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