python -m pip install --upgrade pip --default-timeout=100 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.

python -m pip install --upgrade pip  --default-timeout=100  -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

 pip install eventlet   --default-timeout=100  -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

 

参考：https://blog.csdn.net/sinat_26811377/article/details/99698807