import Tkinter as tk
Error : ModuleNotFoundError: No module named 'Tkinter'
import Tkinter as tk
Error : ModuleNotFoundError: No module named 'Tkinter'
For python2 it is Tkinter
For python3 it is tkinter
jupyter notebook is mostly python3 so you may want to try
from tkinter import *
this question is similar to this question Difference between TKinter and tkinter
As others have stated if you are using python 3 the module name has changed to tkinter from Tkinter, so using import tkinter
should solve your problem
from Tkinter import *
win=Tk()
win.title('My First GUI')
win.mainloop()