ModuleNotFoundError: No module named 'tkinter'

sudo apt-get install python3-tk 

try:
    # for Python2
    # sudo apt-get install python-tk 
    from Tkinter import *   ## notice capitalized T in Tkinter 
except ImportError:
    # for Python3
    # sudo apt-get install python3-tk 
    from tkinter import *   ## notice lowercase 't' in tkinter here