http://www.jianshu.com/p/51811fa24752
brew install python3
安装路径：/usr/local/Cellar
使用：
执行python3即可
配置到pycharm:
https://segmentfault.com/q/1010000008505024/a-1020000008507815
https://segmentfault.com/a/1190000003758895