bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml

pycharm开发中遇到bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library错误。原因是没有安装lxml解析器。在interpreter中搜索lxml并安装即可解决这个问题。

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