pip常用命令:https://www.cnblogs.com/keithtt/p/9393036.html
pip镜像源设置教程:https://blog.csdn.net/weixin_39715012/article/details/108446037
pip升级问题处理
python -m pip install --upgrade pip -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
相关问题处理
问题1:No module named pip 参考文章:https://www.cnblogs.com/badaoliumangqizhi/p/11845158.html
执行
python -m ensurepip
使用豆瓣更新(豆瓣更新比较快)
python -m pip install --upgrade pip -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
问题2: Could not install packages due to an EnvironmentError: [WinError 5] 拒绝访问
将Python所在目录权限赋给User