xpath语法：http://www.runoob.com/xpath/xpath-syntax.html
xpath开发工具：
1.Chrome插件：xpath helper
2.Firefox插件：xpath checker
XPath在python中的高级应用：https://blog.csdn.net/winterto1990/article/details/47903653
BeautifulSoup用法：https://cuiqingcai.com/1319.html
待更新...
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