


This article brings you relevant knowledge about Python, which mainly sorts out issues related to the crawler parser BeautifulSoup4. Beautiful Soup is a Python that can extract data from HTML or XML files. Library, which can implement the usual methods of document navigation, search, and modification of documents through your favorite converter. Let’s take a look at it. I hope it will be helpful to everyone.
[Related recommendations: Python3 video tutorial ]
1. Introduction to the BeautifulSoup4 library
1. Introduction
Beautiful Soup is a Python library that can extract data from HTML or XML files. It can implement the usual ways of document navigation, search, and modification of documents through your favorite converter. Beautiful Soup will help You save hours or even days of work time.
BeautifulSoup4 converts the web page into a DOM tree:
2. Download the module
1. Click on the window computerwin key R
, enter: cmd
##2. Install beautifulsoup4, Enter the corresponding pip command
: pip install beautifulsoup4 . I have already installed the version that appears and the installation was successful.
3. Guide package
form bs4 import BeautifulSoup3. Parsing libraryBeautifulSoup actually relies on the parser when parsing. In addition to supporting the HTML parser in the Python standard library, it also supports some third-party parsers ( Such as lxml):
Usage | Advantages | Disadvantages | |
---|---|---|---|
BeautifulSoup(html,'html.parser')
| Python's built-in standard library, execution speed Moderate, strong document fault tolerancePython 2.7.3 and versions before Python3.2.2 have poor document fault tolerance | ||
BeautifulSoup(html,'lxml')
| Fast speed, strong document fault toleranceNeed to install C language library | ||
BeautifulSoup(html,'xml'
| Fast speed, the only parser that supports XMLRequires the installation of C language library | ||
BeautifulSoup(html,'htm5llib')
| The best fault tolerance, browser way Parse documents and generate documents in HTMLS formatSlow speed, does not rely on external extensions |
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