阿里源
pip install -r requirements.txt -i https://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com
豆瓣
pip install -r requirements.txt -i https://pypi.doubanio.com/simple/ --trusted-host pypi.doubanio.com
清华大学
pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple/ --trusted-host pypi.tuna.tsinghua.edu.cn