pip install [library_name] -i https://pypi.tuna.tsinghua.edu.cn/simple 清华镜像
pip install [library_name] -i http://pypi.douban.com/simple 豆瓣镜像
pip install [library_name] -i https://pypi.tuna.tsinghua.edu.cn/simple 清华镜像
pip install [library_name] -i http://pypi.douban.com/simple 豆瓣镜像