Python IterTools排列如何包括重复字符

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问题描述

使用Python Itertools.permutations()，我想接收和输出具有重复字符的排列.例如，下面是我的函数及其当前输出.

With Python Itertools.permutations() I would like to receive and output of permutations with repeating characters. For an example this my function below and its current output.

def perm(n,i):
    b = 0
    while b < n:
        n= n -1
        from itertools import permutations as p
        file.write('\n'.join([''.join(item) for item in p(i,n)]))
perm(4,'0123')

输出为:

我将如何获得类似112或222的输出?

how would I get an output like 112 or 222?

组合在排列位置不是特定于顺序的.我要寻找的是找到所有组合，然后是每个组合的每个排列.这可能吗?

from what I understand combinations are not order specific where permutations are. what I am looking for is finding all combinations then every permutation for each combination. Is this possible?

推荐答案

您根本不需要排列.您想要笛卡尔积:

You don't want permutations at all. You want the cartesian product:

import itertools

def perm(n, seq):
    for p in itertools.product(seq, repeat=n):
        file.write("".join(p))
        file.write("\n")

perm(4, "0123")

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