Python 在一行中查找单词并将其追加到新的文本文件中

Question

我将 jupyter notebook 与 pandas 一起使用，我想在一个大文件中找到我选择的重复出现的单词，然后 select 行并将其粘贴或附加到另一个文本文件，例如，单词“test”：

this is a test sample line
this is a second example line
this is a third example line
this is a test fourth sample line
this is a final example line

并在新的文本文件中仅包含单词“test”的行：

this is a test sample line
this is a test fourth sample line

我如何在 python 中使用 jupyter 使事情变得更容易？

PS。如果您可以从多个文本文件中读取并附加行而不覆盖它们，那就太完美了！

一如既往的感谢！

Answer 1

假设以下数据框作为输入：

                                 col
0         this is a test sample line
1      this is a second example line
2       this is a third example line
3  this is a test fourth sample line
4       this is a final example line

您可以使用 str.contains:

df[df['col'].str.contains(r'\btest\b', regex=True)]

输出：

                                 col
0         this is a test sample line
3  this is a test fourth sample line

Python 在一行中查找单词并将其追加到新的文本文件中

Python find word in a rows and append this in a new text file

python

pandas

jupyter-notebook