pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple