pqi优化pip下载速度
pip install selenium
pip install --upgrade selenium
pip show selenium官网下载selenium-3.141.0.tar.gz
https://pypi.org/project/selenium/#files
cd 解压目录
python setup.py installhttp://npm.taobao.org/mirrors/chromedriver/原文：https://www.cnblogs.com/kylingx/p/11915100.html