List 用Python连接列表

我想连接两个列表：

list_a = ["hello", "world"]
list_b = ["a", "b", "c", "d"] 

并得到如下输出：

list_c = ["hello a", "hello b", "hello c", "hello d", "world a", "world b", "world c", "world d"] 

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第二个列表基本上是从a到z，并创建与列表a的组合。

您可以使用列表理解：

from functools import reduce

list_a = ["hello", "world"]
list_b = ["a", "b", "c", "d"]

def cross_join_lists(word):
    return [f'{word} {letter}' for letter in list_b]

def concat_lists(final_list, a_list):
    return final_list + a_list

joined_lists = list(map(cross_join_lists, list_a))
list_c = reduce(concat_lists, joined_lists)

print(list_c)

new_list = [f"{i} {j}" for i in list_a for j in list_b]

# output: ['hello a', 'hello b', 'hello c', 'hello d', 'world a', 'world b', 
          'world c', 'world d']

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