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： 雖然在程序中引入bs4類庫，但是需要在ba4中安裝lxml包 具體操作： 註釋：本人使用python2.7版本 在PyCharm中 點擊：file-->setting進入如圖所示： 雙擊lxml進入如圖： 需等待一

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