August 2022
Intermediate to advanced
441 pages
11h 26m
Chinese
Content preview from Python文本分析
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
准备统计和机器学习的文本数据
｜
111
有关元字符（比如“
^
”）以及特殊字符类（比如“
\w
”）的介绍，请参
见 W3Schools（
https://oreil.ly/pZgG1
）。还有一些交互式的网站可供开发
和测试正则表达式，例如
https://regex101.com
（请确保将“Flavor”设置成
Python）。
在许多软件包中，你都可以找到预编译的正则表达式，类似下面这个：
RE_BRACKET = re.compile('\[[^\[\]]*\]')
text = RE_BRACKET.sub(' ', text)
预编译最初是一种提高性能的机制，但是现代 Python 可以自动缓存编译后的
正则表达式。然而，对于常见的正则表达式，使用预编译仍然有很多好处，而
且还可以提高可读性。
看一看
Reddit
数据集中的如下文本示例：
text = """
After viewing the [PINKIEPOOL Trailer](https://www.youtu.be/watch?v=ieHRoHUg)
it got me thinking about the best match ups.
<lb>Here's my take:<lb><lb>[](/sp)[](/ppseesyou) Deadpool<lb>[](/sp)[](/ajsly)
Captain America<lb>"""
如果对上述文本进行清理和打磨，那么我们肯定能获得更好的分析结果。有些标签
只是网页抓取的产物，所以我们应该剔除它们。而且我们对 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.