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Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.
https://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html
http://wiki.jikexueyuan.com/project/python-crawler-guide/
http://www.w3school.com.cn/xpath/xpath_syntax.asp
http://www.cnblogs.com/huxi/archive/2010/07/04/1771073.html
http://wiki.jikexueyuan.com/project/python-crawler-guide/regular-expressions.html
https://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html#id49