

tkinter is the integrated GUIĀ package in python. It has had an import naming change in python 3. This is the main hindrance in making tkinter codes run on python 3 or vice versa. fortunately the fix is a simple one
Some syntax
in python 2 we imported as :
import Tkinter
and in python 3 we import as :
import tkinter
notice the T in py2
The fix
Here is a tip for cross platforming :
try: import tkinter except ImportError: import Tkinter
What it does
it imports the py3 version, if ok, it continues if no … it imports the python2 version, simple !