pip install [library_name] -i https://pypi.tuna.tsinghua.edu.cn/simple mirror Tsinghua
pip install [library_name] -i http://pypi.douban.com/simple mirror watercress
pip install [library_name] -i https://pypi.tuna.tsinghua.edu.cn/simple mirror Tsinghua
pip install [library_name] -i http://pypi.douban.com/simple mirror watercress