from Tkinter import *
def callback():
print("called")
root = Tk()
menu = Menu(root)
root.config(menu = menu)
fileMenu = Menu(menu)
menu.add_cascade(label="File",menu=fileMenu) #add File menu
fileMenu.add_command(label="New",command=callback) #add sub menu and command
fileMenu.add_command(label="Open..",command=callback)
fileMenu.add_separator()
fileMenu.add_command(label="Quit..",command=callback)
helpMenu = Menu(menu)
menu.add_cascade(label="Help",menu=helpMenu)
helpMenu.add_command(label="About..",command=callback)
root.mainloop()