from tkinter import *
root = Tk()

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

mml = Menu(m)
m.add_cascade(label ="File", menu = mml)
mml.add_command(label="New File Ctrl+N")
mml.add_command(label="Open Ctrl+O")
mml.add_command(label="Close Alt+F4")

mm2 = Menu(m)
m.add_cascade(label="Edit", menu=mm2)
mm2.add_command(label="Gut Ctrl+X")
mm2.add_command(label="Copy Ctrl+C")

mm3 = Menu(m)
m.add_cascade(label="Help", menu= mm3)
vmm3.add_command(label="IDLE Help ")
vmm3.add_command(label="Python Docs Fl")

root.mainloop ()