menu_bar_01.py

from tkinter import *

def donothing():
   x = 0
   
def new_tab_01():
   x = 0
   
def menu_bar():

    root = Tk()
    menubar = Menu(root)
    filemenu = Menu(menubar, tearoff=0)
    filemenu.add_command(label="New", command=new_tab_01)
    filemenu.add_command(label="Open", command=donothing)
    filemenu.add_command(label="Save", command=donothing)
    filemenu.add_separator()
    filemenu.add_command(label="Exit", command=root.quit)
    menubar.add_cascade(label="File", menu=filemenu)

    helpmenu = Menu(menubar, tearoff=0)
    helpmenu.add_command(label="Help Index", command=donothing)
    helpmenu.add_command(label="About...", command=donothing)
    menubar.add_cascade(label="Help", menu=helpmenu)

    root.config(menu=menubar)
    root.mainloop()