Tkinter Not Found

You may have both Python 2.x and Python 3.x. And py extension is linked to Python 2.x interpreter. And your python script is designed to run with Python 2.x.

In Python 3, Tkinter module was renamed to tkinter (lowercase).

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Make a script as follow, then run it by clicking it, and run it in command. You may get different results:

import sys
print(sys.version)
input()