lxml安装
soup = BeautifulSoup(str1, 'lxml')
有时提示：bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?有
阅读背景：
安装lxml HTML 解析器，需要c语言库? BeautifulSoup
来源：互联网
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