Python Itertools仅排列字母和数字 [英] Python Itertools permutations only letters and numbers

问题描述

我只需要获取包含字母和数字的排列(排列不能是."A，B，C，D"，我需要这样:"A，B，C，1")

I need to get only the permutations that have letters and numbers (The permutation can not be. "A, B, C, D" I need it like this: "A, B, C, 1")

简而言之，排列不能仅包含字母，而不能仅包含数字.必须是两者的组合.

In short, the permutations can not contain only letters, not just numbers. Must be a combination of both.

我的代码:

import itertools
print list(itertools.combinations([0,1,2,3,4,'a','b','c','d'], 4))

然后我得到:

[(0, 1, 2, 3), (0, 1, 2, 4), (0, 1, 2, 'a'), (0, 1, 2, 'b'), (0, 1, 2, 'c'), (0, 1, 2, 'd'), (0, 1, 3, 4), (0, 1, 3, 'a'), (0, 1, 3, 'b'), (0, 1, 3, 'c'), (0, 1, 3, 'd'), (0, 1, 4, 'a'), (0, 1, 4, 'b'), (0, 1, 4, 'c'), (0, 1, 4, 'd'), (0, 1, 'a', 'b'), (0, 1, 'a', 'c'), (0, 1, 'a', 'd'), (0, 1, 'b', 'c'), (0, 1, 'b', 'd'), (0, 1, 'c', 'd'), (0, 2, 3, 4), (0, 2, 3, 'a'), (0, 2, 3, 'b'), (0, 2, 3, 'c'), (0, 2, 3, 'd'), (0, 2, 4, 'a'), (0, 2, 4, 'b'), (0, 2, 4, 'c'), (0, 2, 4, 'd'), (0, 2, 'a', 'b'), (0, 2, 'a', 'c'), (0, 2, 'a', 'd'), (0, 2, 'b', 'c'), (0, 2, 'b', 'd'), (0, 2, 'c', 'd'), (0, 3, 4, 'a'), (0, 3, 4, 'b'), (0, 3, 4, 'c'), (0, 3, 4, 'd'), (0, 3, 'a', 'b'), (0, 3, 'a', 'c'), (0, 3, 'a', 'd'), (0, 3, 'b', 'c'), (0, 3, 'b', 'd'), (0, 3, 'c', 'd'), (0, 4, 'a', 'b'), (0, 4, 'a', 'c'), (0, 4, 'a', 'd'), (0, 4, 'b', 'c'), (0, 4, 'b', 'd'), (0, 4, 'c', 'd'), (0, 'a', 'b', 'c'), (0, 'a', 'b', 'd'), (0, 'a', 'c', 'd'), (0, 'b', 'c', 'd'), (1, 2, 3, 4), (1, 2, 3, 'a'), (1, 2, 3, 'b'), (1, 2, 3, 'c'), (1, 2, 3, 'd'), (1, 2, 4, 'a'), (1, 2, 4, 'b'), (1, 2, 4, 'c'), (1, 2, 4, 'd'), (1, 2, 'a', 'b'), (1, 2, 'a', 'c'), (1, 2, 'a', 'd'), (1, 2, 'b', 'c'), (1, 2, 'b', 'd'), (1, 2, 'c', 'd'), (1, 3, 4, 'a'), (1, 3, 4, 'b'), (1, 3, 4, 'c'), (1, 3, 4, 'd'), (1, 3, 'a', 'b'), (1, 3, 'a', 'c'), (1, 3, 'a', 'd'), (1, 3, 'b', 'c'), (1, 3, 'b', 'd'), (1, 3, 'c', 'd'), (1, 4, 'a', 'b'), (1, 4, 'a', 'c'), (1, 4, 'a', 'd'), (1, 4, 'b', 'c'), (1, 4, 'b', 'd'), (1, 4, 'c', 'd'), (1, 'a', 'b', 'c'), (1, 'a', 'b', 'd'), (1, 'a', 'c', 'd'), (1, 'b', 'c', 'd'), (2, 3, 4, 'a'), (2, 3, 4, 'b'), (2, 3, 4, 'c'), (2, 3, 4, 'd'), (2, 3, 'a', 'b'), (2, 3, 'a', 'c'), (2, 3, 'a', 'd'), (2, 3, 'b', 'c'), (2, 3, 'b', 'd'), (2, 3, 'c', 'd'), (2, 4, 'a', 'b'), (2, 4, 'a', 'c'), (2, 4, 'a', 'd'), (2, 4, 'b', 'c'), (2, 4, 'b', 'd'), (2, 4, 'c', 'd'), (2, 'a', 'b', 'c'), (2, 'a', 'b', 'd'), (2, 'a', 'c', 'd'), (2, 'b', 'c', 'd'), (3, 4, 'a', 'b'), (3, 4, 'a', 'c'), (3, 4, 'a', 'd'), (3, 4, 'b', 'c'), (3, 4, 'b', 'd'), (3, 4, 'c', 'd'), (3, 'a', 'b', 'c'), (3, 'a', 'b', 'd'), (3, 'a', 'c', 'd'), (3, 'b', 'c', 'd'), (4, 'a', 'b', 'c'), (4, 'a', 'b', 'd'), (4, 'a', 'c', 'd'), (4, 'b', 'c', 'd'), ('a', 'b', 'c', 'd')]

我要提出这个问题，如果我想保存到文本文件，请告诉我是否有一种方法可以知道获取的文件的大小.我还想知道是否有任何方法可以计算出所有排列要求的时间.

I pushing this question, let me know if there is a possible way of knowing the size of the file obtained, if I want to save to a text file. I also want to know if there is any way to calculate how long it would take to get all permutations'm asking.

非常感谢您.

推荐答案

使用集合交集:

import itertools
import string
numbers = set(range(10))
letters = set(string.ascii_letters)
print([x for x in itertools.combinations([0,1,2,3,4,'a','b','c','d'], 4)
       if set(x) & letters and set(x) & numbers])

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