如何使用python库re.sub去除文件的开头? [英] how to strip the beginning of a file with python library re.sub?

问题描述

我很高兴问我的第一个 python 问题！！！我想去掉下面示例文件的开头(文章第一次出现之前的部分).为此，我使用 re.sub 库.

I'm happy to ask my first python question !!! I would like to strip the beginning (the part before the first occurrence of the article) of the sample file below. To do this I use re.sub library.

下面是我的文件sample.txt:

below this is my file sample.txt:

fdasfdadfa
adfadfasdf
afdafdsfas
adfadfadf
adfadsf
afdaf

article: name of the first article
aaaaaaa
aaaaaaa
aaaaaaa
article: name of the first article
bbbbbbb
bbbbbbb
bbbbbbb
article: name of the first article
ccccccc
ccccccc
ccccccc

还有我解析这个文件的 Python 代码:

And my Python code to parse this file:

for line in open('sample.txt'):
    test = test + line

result = re.sub(r'.*article:', 'article', test, 1, flags=re.S)
print result

遗憾的是，此代码仅显示最后一篇文章.代码输出:

Sadly this code only displays the last article. The output of the code:

article: name of the first article
ccccccc
ccccccc
ccccccc

有人知道如何只去掉文件的开头并显示3篇文章吗?

Does someone know how to strip only the beginning of the file and display the 3 articles?

推荐答案

您可以使用 itertools.dropwhile 得到这个效果

You can use itertools.dropwhile to get this effect

from itertools import dropwhile

with open('filename.txt') as f:
    articles = ''.join(dropwhile(lambda line: not line.startswith('article'), f))

print(articles)

印刷品

article: name of the first article
aaaaaaa
aaaaaaa
aaaaaaa
article: name of the first article
bbbbbbb
bbbbbbb
bbbbbbb
article: name of the first article
ccccccc
ccccccc
ccccccc

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