网络爬虫技术：通过LXML解析HTML页面获取内容；通过XPath方法提取所需数据

未完待续

一、学习网站

1.https://lxml.de/

https://lxml.de/xpathxslt.html#xpath-return-values

2.https://www.w3.org/TR/xpath/all/

二、lxml - XML and HTML with Python

lxml is the most feature-rich and easy-to-use library for processing XML and HTML in the Python language.

Parsers are represented by parser objects. There is support for parsing both XML and (broken) HTML. Note that XHTML is best parsed as XML, parsing it with the HTML parser can lead to unexpected results.

2.解析器类型与适用性分析

可选用的解析工具包括：lxml.etree.XMLParser()以及lxml.etree.HTMLParser()，我们能够借助etree模块所提供的相关函数来实现对