如何合并列表以获得下面提到的输出？

Question

我有以下代码：

import itertools

host = ["computer1", "computer2"]

variants = [".some.domain.com", ".another.domain.com"]

for host in host:

    merged_list = "\n".join([host + variants_index for variants_index in variants])

    merged_list = merged_list.split()

    united = list(itertools.chain(merged_list))

    print(united)

但我想要以下输出： ['computer1.some.domain.com'、'computer1.another.domain.com'、'computer2.some.domain.com'、'computer2.another.domain.com']

我现在得到的是这样的：

['computer1.some.domain.com', 'computer1.another.domain.com']

['computer2.some.domain.com', 'computer2.another.domain.com']

如何将它们全部合并在一起？

Answer 1

试试这个，你甚至不需要 itertools，正如另一个答案的评论中指出的那样，它甚至更快（比 for 循环或 itertools.product）

united = [h + v for h in host for v in variants]

Answer 2

我认为使用简单的嵌套 for 循环会更简单：

united = []
for host in hosts:
    for variant in variants:
        united.append(host + variant)

您可以将其折叠为列表理解，但我发现嵌套列表理解通常比它们的价值更麻烦。虽然分析确实表明它们更快，尤其是在大输入时。

Answer 3

使用 itertools 产品

from itertools import product

result = [a+b for a, b in product(host, variants)]

#result: ['computer1.some.domain.com', 'computer1.another.domain.com', 'computer2.some.domain.com', 'computer2.another.domain.com']

如何合并列表以获得下面提到的输出？

How to merge list to get the mentioned output below?

python

list

itertools