py related issues

在python中安装包出现Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None))

pip install keras -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

eg

pip3 install pomodorotimer -i http://pypi.douban.com/simple --trusted-host pypi.douban.com