- 1.安装lxml模块
 - 2.pip install lxml (此处如果下载速度比较慢,可以通过查看之前的博客所写的方法)
 - 3.导入extree(from lxml import etree)
 - 4.tree = extree.XML()
 - 5.tree = extree.html()
 - 6.tree = extree.parse()
 - 然后通过tree即可进行相关的xpath操作