[Python] How to run a Python 3 tkinter app without opening any Terminal windows in Mac OS X?

I developed a GUI app in Python 3. I want to be able to launch it by clicking on the script itself or in a custom-made launching script. I have changed permissions and it's now opening with "Python Launcher" on double-click. But everytime I run my app, I get a lot of windows:

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  My Python application (that's the only one I need to be on screen)
  
  
• 
  The Python launcher preferences (I could live with this one, but would prefer it to be hidden)
  
  
• 
  A Terminal window with the default shell (don't need this one)
  
  
• 
  Another Terminal window showing the output of the app (like print, errors... I don't want this window)
  

What is the easiest way to get only the GUI on screen, without any Terminal windows?

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