Couldn‘t find a tree builder with the features you requested: lxml.解决方案

Traceback (most recent call last):
  File "/Users/nick/Desktop/testPy/shuihuzhuan.py", line 18, in 
    soup = BeautifulSoup(response.text,'lxml')
  File "/Users/nick/Library/Python/3.8/lib/python/site-packages/bs4/__init__.py", line 248, in __init__
    raise FeatureNotFound(
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

扒取网页内容时候，报错，找不到lxml，安装 lxml pip install lxml即可

pip install lxml

首先确认系统中安装的有python及pip模块
如果有下面报错信息 zsh: command not found: pip，请先安装pip模块再执行以上命令

brew install python3-pip