出现这个错误，因为我的python3是直装的，环境一直没设好orz：
SublimeREPL: obtaining sane environment failed in getenv()
Check console and 'getenv_command' setting
WARN: Falling back to SublimeText environment
解决办法是：
1、打开：Package Settings -> SublimeREPL -> Settings - User
{
"default_extend_env":
{"PATH":
"{PATH}:/Library/Frameworks/Python.framework/Versions/3.6/bin"
},
"getenv_command": false
}
2、打开Sublime Text 3/Packages/SublimeREPL/config/Python/Main.sublime-menu
找到IPython的cmd，把osx的改成
"osx": ["/Library/Frameworks/Python.framework/Versions/3.6/bin"],
反正也不知道哪个对了，一定要都改，才能不出错和input输入。