No module named 'Tkinter'

[jdos]

from future.moves import Tkinter as tk
window = tk.tk()
# to rename the title of the window
window.title("GUI")
# pack is used to show the object in the window
label = tk.label(window, text = "Welcome to DataCamp's Tutorial on Tkinter!").pack()

Have you tried

from future.moves import tkinter as tk
window = tk.Tk()

as capitalization matters, I tried that with tkinter and works just fine (well it does load the library)
for example after you set tkinter you will get an error for your tk.tk() as it should be tk.TK() the same goes for label, it should be Label

so it should be

from future.moves import tkinter as tk
window = tk.Tk()
# to rename the title of the window
window.title("GUI")
# pack is used to show the object in the window
label = tk.Label(window, text = "Welcome to DataCamp's Tutorial on Tkinter!").pack()