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

bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml， 原因： 虽然在程序中引入bs4类库，但是需要在ba4中安装lxml包 具体操作： 注释：本人使用python2.7版本 在PyCharm中 点击：file-->setting进入如图所示： 双击lxml进入如图： 需等待一

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