Ubuntu14.04系统Python默认版本是2.7.6
pip升级后通过pip安装一些python包时报如下两个告警（SNIMissingWarning和InsecurePlatformWarning），其实是SSL的问题，urllib3需要pyopenssl
1.首先安装mysql server，见：http://rule.iteye.com/admin/blogs/2276278
2.安装依赖
sudo apt-get install python-dev libmysqlclient-dev
3.安装mysqlclient驱动
sudo pip install mysqlclient
报SNIMissingWarning和InsecurePlatformWarning告警
4.通过安装pyopenssl等依赖包解决这两个告警问题
sudo apt-get install libffi-dev libssl-dev
pip install cryptography
pip install pyopenssl ndg-httpsclient pyasn1
参考：https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning