python bs4解析网页时 bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: l

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Python小白，学习时候用到bs4解析网站，报错

bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

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几经周折才知道是bs4调用了python自带的html解析器，我用的mac，默认安装的是python2，所以内置的解释器也是捆绑在python2上，而我学习的时候又自己安装了python3，开发环境也是python3的，貌似是没有html解释器，所以会报错。
问题找到了，那么怎么解决呢？对，在python3也装一个html解析器就好了，那么怎么安装呢？查阅资料获悉：一般pip和pip2对应的是python2.x，pip3对应的是python3.x的版本，python2和python3的模块是独立的，不能混用，混用会出问题。所以命令行通过python3的pip：pip3 安装解析器：

$ pip3 install lxml

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3.8M，稍等片刻即可
再次运行项目，完美解决，特此记录

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