[英]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,但是我不确定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)]
会给我类似的东西:
[['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']]
有办法解决吗?
如果说
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']]
如预期的。
但是,如果您的原始表情
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-为什么要首先建立一个长度为1的子列表的列表?
看起来像您想要的,直接:
y = [item.split() for item in content]
而不是产生contentLists
,也就是x
,然后从中产生y
,不是吗?
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']]
简单的list comprehension
可以帮助您。
您可以像这样高效地实现所需的目标:
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()
创建一个分为行的副本:不需要这两个数据结构,因为您可以简单地逐行读取文件并拆分每行依次,如上所述。 这更加有效和简单。
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