SublimeREPL python can not work on ubuntu 16.04

[ashengtx]

I have installed SublimeREPL successfully. I click tools -> SublimeREPL -> python -> python to open the shell in a new tag, then I input some expressions. However, it had no response after I pressed 'Enter'.

Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> num = 123

Could someone help me fix this problem ? Thanks!