本书讲解了如何使用P川lOil来编写网络爬虫程序， 内容包括网络爬虫简 介， 从页面中抓取数据的三种方法， 提取缓存中的数据， 使用多个线程和进 程来进行并发抓取， 如何抓取动态页面中的内容， 与表单进行交互， 处理页 面中的验证码问题， 以及使用 Scarpy和Portia 来进行数据抓取， 并在最后使 用本书介绍的数据抓取技术对几个真实的网站进行了抓取， 旨在帮助读者活 学活用书中介绍的技术。 本书适合有一定Python 编程经验， 而且对爬虫技术感兴趣的读者阅读。(This book explains how to use P in lOil to write a web crawler program, including the introduction of web crawler, from three kinds of methods to grab the data page, extract the data in the cache, the use of multiple threads and processes for concurrent crawl, how to crawl dynamic content, interact with the form, page processing the verification code, and the use of Scarpy and Portia for data capture, data capture technology and in final use this book introduces on several real-world sites were designed to help the reader grasp, book of learning and using technology. This book is suitable for readers with some Python programming experience and readers interested in crawling technology.)