问题汇总

1.Chromedriver版本问题
报错：

 session not created: This version of ChromeDriver only supports Chrome version 84

解决：
下载与Chrome一致的Chromedriver版本
ChromeDriver下载地址：http://npm.taobao.org/mirrors/chromedriver/

2.127.0.0.1与192.168.1.1有什么区别
127.0.0.1 是本机地址 相当于 localhost
192.168.1.1 是网络ip地址

3.pip版本问题

WARNING: You are using pip version 20.2.3; however, version 20.2.4 is available.
You should consider upgrading via the '/usr/local/opt/python@3.8/bin/python3.8 -m pip install --upgrade pip' command.

根据提示对pip进行升级

/usr/local/opt/python@3.8/bin/python3.8 -m pip install --upgrade pip

但是又报错了

ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: 'RECORD'
Consider using the `--user` option or check the permissions.

提示说是没有权限，加上sudo 输入密码就可以升级成功了

sudo /usr/local/opt/python@3.8/bin/python3.8 -m pip install --upgrade pip

Looking in indexes: http://mirrors.aliyun.com/pypi/simple/
Collecting pip
  Downloading http://mirrors.aliyun.com/pypi/packages/cb/28/91f26bd088ce8e22169032100d4260614fc3da435025ff389ef1d396a433/pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
     |████████████████████████████████| 1.5 MB 4.2 MB/s 
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.3
    Uninstalling pip-20.2.3:
      Successfully uninstalled pip-20.2.3
Successfully installed pip-20.2.4