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Beautiful Soup是什么？
Beautiful Soup is a Python library for pulling data out of HTML and XML files. It works with your favorite parser to provide idiomatic ways of navigating, searching, and modifying the parse tree. It commonly saves programmers hours or days of work.
中文文档：https://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html
英文文档：https://www.crummy.com/software/BeautifulSoup/bs4/doc/