使用Python在嵌套列表之前添加字符串

Question

我有一个嵌套列表，例如：

names = [['James', 'Logan', 'Timothy'], ['Ander', 'John', 'Henry']]

在每个名字之前，我想在每个名字之前添加这个字符串'His name is: '。因此，它应该逐行打印：

His name is: James
His name is: Logan
His name is: Timothy
His name is: Ander
His name is: John
His name is: Henry

我用过

for n in names: print(f'His name is: {n}')

但这并没有给出我想要的输出。你能帮我弄清楚怎么做吗？

Answer 1

你有一个嵌套的列表。因此，使用嵌套的for循环-

names = [['James', 'Logan', 'Timothy'], ['Ander', 'John', 'Henry']]

for i in names:
    for n in i:
        print(f'His name is: {n}')

Answer 2

from itertools import chain


for name in chain.from_iterable(names):
    print(f'His name is: {name}')

Answer 3

如果希望避免使用嵌套循环或itertools，可以使用sum合并所有嵌套列表

names = [['James', 'Logan', 'Timothy'], ['Ander', 'John', 'Henry']]

for name in sum(names, []):
    print(f'His name is: {name}')