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## aa1的长度是4

aa1=[[1,2,3],

[4,5,6],

[7,8,9],

[10,11,12]]

## bb1的长度是3

bb1=[["a"],["b"],["c"]]

import itertools

#cc1的长度是4*3=12,cc1里面的每个一级元素是一个元组

cc1=list(itertools.product(aa1,bb1))

#cc1结果如下

print(cc1)

In [29]: cc1

Out[29]:

[([1, 2, 3], ['a']),

([1, 2, 3], ['b']),

([1, 2, 3], ['c']),

([4, 5, 6], ['a']),

([4, 5, 6], ['b']),

([4, 5, 6], ['c']),

([7, 8, 9], ['a']),

([7, 8, 9], ['b']),

([7, 8, 9], ['c']),

([10, 11, 12], ['a']),

([10, 11, 12], ['b']),

([10, 11, 12], ['c'])]

可以看到cc1就是笛卡尔积。