Tkinter: Drop down menu

#https://www.youtube.com/watch?v=PSm-tq5M-Dc&list=PL6gx4Cwl9DGBwibXFtPtflztSNPGuIB_d&index=9
from tkinter import *

def doNothing():
    print('doNothing')


root = Tk()

valikko = Menu(root)
root.config(menu=valikko)

subMenu = Menu(valikko)
valikko.add_cascade(label='File', menu=subMenu)

subMenu.add_command(label='doNothing...', command=doNothing)
subMenu.add_command(label='doNothing 2...', command=doNothing)
subMenu.add_separator()
subMenu.add_command(label='doNothing 3...', command=doNothing)
subMenu.add_separator()
subMenu.add_command(label='Exit', command=root.quit)

editMenu = Menu(valikko)

valikko.add_cascade(label='Edit', menu=editMenu)
editMenu.add_command(label='Tööt', command=doNothing)

root.mainloop()