2023-06-03 Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

运行一个py文件，问题定位到：

html=self.get_html(url)
soup=BeautifulSoup(html,'lxml')

解决方案：打开cmd，运行下面代码：

pip install lxml

等待安装成功，再次运行py文件就不会报这个错了。

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