Python网络爬虫二三事

http://www.jianshu.com/p/0bfd0c48457f 

网络爬虫基本原理

http://www.cnblogs.com/wawlian/archive/2012/06/18/2553061.html 

http://www.cnblogs.com/wawlian/archive/2012/06/18/2554072.html

http://www.jianshu.com/p/4ce0b0588fa3