pip设置源
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip config set install.trusted-host pypi.tuna.tsinghua.edu.cn
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip config set install.trusted-host pypi.tuna.tsinghua.edu.cn