我们可以使用itertools.permutations（iterable，r = None）函数来生成不同长度矢量的排列组合。下面是示例代码：

import itertools

不同大小矢量

vec1 = [1,2,3] vec2 = [4,5]

合并矢量并生成排列组合

perms = itertools.permutations(vec1+vec2)

打印所有排列组合

for perm in list(perms): print(perm)

输出结果为： (1, 2, 3, 4, 5) (1, 2, 3, 5, 4) (1, 2, 4, 3, 5) (1, 2, 4, 5, 3) (1, 2, 5, 3, 4) (1, 2, 5, 4, 3) (1, 3, 2, 4, 5) (1, 3, 2, 5, 4) (1, 3, 4, 2, 5) (1, 3, 4, 5, 2) (1, 3, 5, 2, 4) (1, 3, 5, 4, 2) (1, 4, 2, 3, 5) (1, 4, 2, 5, 3) (1, 4, 3, 2, 5) (1, 4, 3, 5, 2) (1, 4, 5, 2, 3) (1, 4, 5, 3, 2) (1, 5, 2, 3, 4) (1, 5, 2, 4, 3) (1, 5, 3, 2, 4) (1, 5, 3, 4, 2) (1, 5, 4, 2, 3) (1, 5, 4,