bs4.FeatureNotFound: Couldn‘t find a tree builder with the features you requested: lxml.

我刚开始学些爬虫，用的是Pycharm编译器，在爬虫的时候用到了BeautifulSoup，里面涉及到lxml，如下图所示： 运行之后便报如下错误：bs4.FeatureNotFound: Couldn’t find a tree builder with the features you requested: lxml. 百度过后才发现，这里报错的意思是：你的开发环境下下载的包里不存在你需要的l

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