python3 bs4解析网页时报错： bs4.FeatureNotFound: Couldn’t find a tree builder with the features you requested: lxml.
bs4调用了python自带的html解析器，python3没有html解释器，所以会报错。
给python3装一个html解析器：
pip3 install lxml
bs4.FeatureNotFound: Couldn’t find a tree builder with the features you requested: lxml.
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python报错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. Do you need to install a parser library?
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?
bs4解析错误之 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. Do you need to install a parser library?
Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?----最终解
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