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html = req.textbf = BeautifulSoup(html)
虽然正常运行了，警告了一大段信息，要你指明解析器把features=“html.parser” 加上就可以
GuessedAtParserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("html.parser"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.The code that caused this warning is on line 8 of the file D:\pythonProject\STU\HTML.py. To get rid of this warning, pass the additional argument 'features="html.parser"' to the BeautifulSoup constructor.bf = BeautifulSoup(html)
修改后，就正常了，
html = req.textbf = BeautifulSoup(html,features="html.parser")
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