Python--xpath use

One: XPath introduction

The XPath full name XML Path language, which determines the location of a part of an XML document. XPath is based on an XML tree structure, looking for nodes in the tree.

Now, it is common to use XPath to find and extract information in XML, and it also supports HTML. Therefore, we can use XPath instead of regular expression to extract the information.

XPath is navigated through elements and attributes.

Two: XPath uses approximate steps

1: Installing the lxml module

2: Import tree structure

 from Import etree

3: Transform the Web page crawled into a tree-shaped structure requests

Selector=etree. HTML (Web source)

4: Find information from the tree structure

Selector.xpath (Find condition)

Three: Code combat

Python--xpath use