July 2017
Intermediate to advanced
398 pages
11h 54m
Chinese
Content preview from Python数据处理
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.
73
第 5 章
处理
PDF
文件，以及用
Python
解决问题
只发布
PDF
格式的数据是十分错误的，但有时你也没有其他选择。本章你将学习如何解析
PDF
，在学习过程中，你还会学习如何解决在代码中遇到的错误。
我们还会讲到如何编写脚本，从一些基本概念（例如导入模块）讲起，逐步过渡到一些更
复杂的内容。学完本章，你将学会在代码中思考问题与解决问题的许多方法。
5.1
尽量不要用
PDF
本章用到的数据与上一章相同，只不过是
PDF
格式的。一般来说，我们不会去寻找难以解
析的数据格式，但我们在本书中之所以这么做，是因为你要处理的数据可能并不总是理想
中的格式。你可以在本书的
GitHub
仓库（
https://github.com/jackiekazil/data-wrangling
）中
找到本章所用的
PDF
文件。
在开始解析
PDF
数据之前，你需要考虑以下几件事情。
•
你是否尝试寻找其他格式的数据？如果在网上找不到，试试打电话（见
6.4.1
节）或发
邮件求助。
•
你是否尝试过从文档中直接复制粘贴数据？有时你可以很方便地在
PDF
文件里选择并
复制数据，然后粘贴到电子表格中。但这种做法不一定每次都能奏效，而且也无法规模
化（如果有大量文件或页面，你就没法快速完成了）。
如果你不得不处理
PDF
文件的话，需要学习如何用
Python
解析其中的数据。我们来开始学习。
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.