如何拆分 Python 中嵌套列表中的字符串?

How do I split strings within nested lists in Python?

我知道如何使用这些字符串将字符串列表拆分为嵌套列表,但我不确定现在如何将这些字符串拆分为多个字符串。

例如:

def inputSplit(file_name):
    with open(file_name) as f:
        content = f.read().splitlines()
    i = 0
    contentLists = [content[i:i+1] for i in range(0, len(content), 1)]

会给我这样的东西:

[['these are some words'], ['these are some more words'], ['these are even more words'], ['these are the last words']]

我不确定如何使用字符串拆分使我的输出看起来像这样:

[['these', 'are', 'some', 'words'], ['these', 'are', 'some', 'more', 'words'], ['these', 'are', 'even', 'more', 'words'], ['these', 'are', 'the', 'last', 'words']]

我有办法解决这个问题吗?

x=[['these are some words'], ['these are some more words'], ['these are even more words'], ['these are the last words']]
print [i[0].split() for i in x]

输出:[['these', 'are', 'some', 'words'], ['these', 'are', 'some', 'more', 'words'], ['these', 'are', 'even', 'more', 'words'], ['these', 'are', 'the', 'last', 'words']]

简单 list comprehension 可以为您做到。

如果,比如说,

x = [['these are some words'], ['these are some more words'], ['these are even more words'], ['these are the last words']]

然后

 y = [sublist[0].split() for sublist in x]

会给你

[['these', 'are', 'some', 'words'], ['these', 'are', 'some', 'more', 'words'], ['these', 'are', 'even', 'more', 'words'], ['these', 'are', 'the', 'last', 'words']]

随心所欲。

但是,如果您的原始表达式

contentLists = [content[i:i+1] for i in range(0, len(content), 1)]

生成我在这里称为 x 的列表,这毫无意义——为什么首先要构建一个长度为 1 的子列表列表?!

看起来像你想要的,直接:

y = [item.split() for item in content]

而不是生成 contentLists,又名 x,然后从中生成 y,不是吗?

您可以像这样以高效的方式实现您想要的:

with open(file_path) as input_file:
    content_lists = [line.split() for line in input_file]

实际上,f.read()首先将整个文件加载到内存中,然后.splitlines()创建一个分成行的副本:不需要这两个数据结构,因为您可以简单地读取逐行归档并依次拆分每一行,如上所述。这样更高效也更简单。