过滤文本文件中包含特定单词的行 [英] Filter lines from a text file which contain a particular word

问题描述

我想编写一个程序，以过滤文本文件中包含苹果"一词的行，并将这些行写入新的文本文件.

I want to write a program which filters the lines from my text file which contain the word "apple" and write those lines into a new text file.

我尝试过的只是在新的文本文件中写上苹果"一词，而我想要整行.

What I have tried just writes the word "apple" in my new text file, whereas I want whole lines.

推荐答案

使用可以使用列表理解来获取所有包含"apple"的行:

Use can get all lines containing 'apple' using a list-comprehension:

[ line for line in open('textfile') if 'apple' in line]

因此-同样在一个代码行中-您可以创建新的文本文件:

So - also in one code-line - you can create the new textfile:

open('newfile','w').writelines([ line for line in open('textfile') if 'apple' in line])

eyquem是对的:将其保留为迭代器并进行编写肯定更快

And eyquem is right: it's definitely faster to keep it as an iterator and write

open('newfile','w').writelines(line for line in open('textfile') if 'apple' in line)

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