pip镜像源速查

https://pypi.mirrors.ustc.edu.cn/simple/

https://pypi.tuna.tsinghua.edu.cn/simple

http://mirrors.aliyun.com/pypi/simple/

http://pypi.douban.com/simple/

http://pypi.hustunique.com/

http://pypi.sdutlinux.org/

pip install --upgrade pip