服务器命令行设置pip为阿里源，清华源
pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple