>> from scipy.special import comb, perm >> perm(3, 2) 6.0 >> comb(3, 2) 3.0
>> from itertools import combinations, permutations >> permutations([1, 2, 3], 2) <itertools.permutations at 0x7febfd880fc0> # 可迭代对象 >> list(permutations([1, 2, 3], 2)) [(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)] >> list(combinations([1, 2, 3], 2)) [(1, 2), (1, 3), (2, 3)]
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