title: How to run python file in Tkinter
body: <p>I'm a beginner in Python, hence the question.
  i would like to run a python file (smileA.py) in Tkinter.
  How would i start? </p>
  
  <p>I do not wish for it to run when clicking a button, but the file to run automatically in the Tkinter itself.</p>
  
  <p>Thanks.</p>