python itertools模塊

import itertools 1.有序排列 a=itertools.permutations([1,2,3,4],2) print a #結果： <itertools.permutations object at 0x0000000001FD8F10> print list(a) #結果： [(1, 2), (1, 3), (1, 4), (2, 1), (2, 3), (2, 4), (3

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