python解决全排列或在n个数组中每个数组选一个值组成的所有序列等等问题

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from itertools import *
if __name__ == '__main__':
    for j in permutations([2,5,6]):
        print(j)
    '''
    (2, 5, 6)
    (2, 6, 5)
    (5, 2, 6)
    (5, 6, 2)
    (6, 2, 5)
    (6, 5, 2)
    '''
    list1 = [1, 2, 3]
    list2 = [4, 5, 6]
    list3 = [7, 8, 9]
    for i in product(list1,list2,list3):
        print(i)
    '''
    (1, 4, 7)
    (1, 4, 8)
    (1, 4, 9)
    (1, 5, 7)
    (1, 5, 8)
    (1, 5, 9)
    (1, 6, 7)
    (1, 6, 8)
    (1, 6, 9)
    (2, 4, 7)
    (2, 4, 8)
    (2, 4, 9)
    (2, 5, 7)
    (2, 5, 8)
    (2, 5, 9)
    (2, 6, 7)
    (2, 6, 8)
    (2, 6, 9)
    (3, 4, 7)
    (3, 4, 8)
    (3, 4, 9)
    (3, 5, 7)
    (3, 5, 8)
    (3, 5, 9)
    (3, 6, 7)
    (3, 6, 8)
    (3, 6, 9)
    '''
    print('*'*20)
    for i in product(*[list2]*3):
        print(i)
    '''
    (4, 4, 4)
    (4, 4, 5)
    (4, 4, 6)
    (4, 5, 4)
    (4, 5, 5)
    (4, 5, 6)
    (4, 6, 4)
    (4, 6, 5)
    (4, 6, 6)
    (5, 4, 4)
    (5, 4, 5)
    (5, 4, 6)
    (5, 5, 4)
    (5, 5, 5)
    (5, 5, 6)
    (5, 6, 4)
    (5, 6, 5)
    (5, 6, 6)
    (6, 4, 4)
    (6, 4, 5)
    (6, 4, 6)
    (6, 5, 4)
    (6, 5, 5)
    (6, 5, 6)
    (6, 6, 4)
    (6, 6, 5)
    (6, 6, 6)
    '''


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