Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.pyth on.org', port=443): Read timed out.

pip install selenium==2.48.0 报错，如下图：

 百度了之后 加上pip源    pip install selenium==2.48.0 -i http://mirrors.aliyun.com/pypi/simple/  

更新升级pip  python -m pip install --upgrade pip

依然报错

解决方法：参考https://blog.csdn.net/qq_38990397/article/details/93194478?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param

如图中 PythonXXLibsite-packagespip-XXX.dist-info  文件夹删除，再重新使用  python -m pip install --upgrade pip 升级成功