bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml
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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：
需等待一段时间！
至此，问题得到解决！！！
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