[Tkinter] On Win 10, no graphical window when run code

[DT2000]

Please place all code and errors in their respective tags when posting.

from tkinter import *
root = Tk()
root.geometry('200x200')
myLabel = Label(root, text = ' Hello World !')
myLabel.pack()
root.mainloop()

This code works fine and generates a small GUI.
I do not know what display setting you are using on your system so I added a small line to change the size of the GUI.