title: Open File in Python Tkinter
body: <p>Is there possible to open and run any file in tkinter?
  I want to open txt file by clicking a button in application.
  Like this picture below</p>
  
  <p><a href="http://i.stack.imgur.com/tAgV2.png" rel="nofollow">Open File</a></p>
  
  <p>Is there any way?</p>