python - python排列有问题

Question

我对排列有一些问题！当谈到 python 时，我是一个非常大的菜鸟，所以任何帮助都将不胜感激！

假设我在文本文件中有一个范围为 1-6 的列表，所以它看起来像 (1,2,3,4,5,6) 我想打开所述 .txt 文件并计算 N 的所有可能组合这6个数字中最多N = 4。

当我使用 itertools 排列时

import itertools
x = [1, 2, 3, 4, 5, 6]
[p for p in itertools.product(x, repeat=2)]
[(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (2, 1), (2, 
2), (2, 3), 
(2, 4), (2, 5), (2, 6), (3, 1), (3, 2), (3, 3), (3, 4), (3, 
5), (3, 6), 
(4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6), (5, 1), (5, 
2), (5, 3), 
 (5, 4), (5, 5), (5, 6), (6, 1), (6, 2), (6, 3), (6, 4), (6,5), 
(6, 6)]

它输出这样的数字，我真的不想要，因为我一次只能得到一个数字的所有组合 - 但我想要 N 个数字的所有可能组合，N 从 1 到 4，包括重复如：

(1,1), (1,1,1) (1,1,1,1), (1,1,1,1) 

所以我希望它有重复，有不同数量的成员组合，但不要超过 4 个组合。我真的在为这个概念而苦苦挣扎！如果有什么不明白的，请随时问我：）

标签： pythonpython-3.xitertools

Answer 1

from itertools import product

LIMIT = 4
l1 = [1,2,3]

results = []

for i in range(1, LIMIT+1):
    results.extend(product(l1, repeat=i))

print(results)

将产生：

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