title: Press enter as command input
body: <p>I have an installer of an application. It has .sh and .bat for *nix/windows os.
  In the scripts it will do something and hang there, waiting some other things to be done, then need press <kbd>Enter</kbd> in that command window, the scripts will continue.</p>
  
  <p>I want to do all the stuff with python. i know subprocess.open can invoke script, but im not sure how to do the "press Enter" thing.. </p>
  
  <p>Any input will be appraciated..</p>