Python3.7爬虫报错处理bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: ht

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

使用BeautifulSoup时，把解析器换成lxml就出错

原因：
缺少lxml库。在cmd命令下输入”pip install lxml“安装即可以。
JetBrains PyCharm IDE中，点击File ->Setting-> Project Interpreter，点击+号

搜索lxml，点击Install Package，等待一会，提示安装成功