sudo pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple linux
pip install django -i https://pypi.tuna.tsinghua.edu.cn/simple windows
sudo pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple linux
pip install django -i https://pypi.tuna.tsinghua.edu.cn/simple windows