python100例排列组合_Python列表list排列组合操作示例

本文实例讲述了python列表list排列组合操作。分享给大家供大家参考，具体如下：

排列

例如：

输入为

['1','2','3']和3

输出为

['111','112','113','121','122','123','131','132','133','211','212','213','221','222','223','231','232','233','311','312','313','321','322','323','331','332','333']

实现代码：

# -*- coding:utf-8 -*-

#! pyhton2

from itertools import product

l = [1, 2, 3]

print list(product(l, l))

print list(product(l, repeat=3))

上述代码运行输出：

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

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

组合

例如：

输入为

[1, 2, 3]和2

输出为

[1, 2], [1, 3], [2, 3] 不考虑顺序

实现代码：

# -*- coding:utf-8 -*-

#! pyhton2

from itertools import combinations

l = [1, 2, 3, 4, 5]

print list(combinations(l, 3))

上述代码运行输出：

[(1, 2, 3), (1, 2, 4), (1, 2, 5), (1, 3, 4), (1, 3, 5), (1, 4, 5), (2, 3, 4), (2, 3, 5), (2, 4, 5), (3, 4, 5)]

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