title: How to get user input in Cloud9 (Python)
body: <p>I've just started using Cloud9 to program with Python.</p>
  
  <p>But when I try to use Tkinter it gives me the error <code>_tkinter.TclError: no display name and no $DISPLAY environment variable</code>.</p>
  
  <p>How should I get user input with Python in Cloud9 (either by setting up this display, or by using another method)?</p>