human
I wrote the below code

    from tkinter import Menu
    from idlelib import mainmenu
    from idlelib import windows
    closeItem = mainmenu.menudefs[0][1][(-2)]
    del mainmenu.menudefs[0][1][(-3):]
    mainmenu.menudefs[0][1].insert(6, closeItem)
    del mainmenu.menudefs[(-1)][1][0:2]
    del mainmenu.menudefs[(-2)][1][0]
    menubar = Menu(root)
    root.configure(menu=menubar)
    menudict = {}
    menudict['windows'] = menu = Menu(menubar, name='windows', tearoff=0)
    menubar.add_cascade(label='Window', menu=menu, underline=0)
    def postwindowsmenu(menu=menu):
        end = menu.index('end')
        if (end is None):
            end = (-1)
        if (end > 0):
            menu.delete(0, end)
        windows.add_windows_to_menu(menu)
    windows.register_callback(postwindowsmenu)
    def about_dialog(event=None):
        "Handle    Help    'About    IDLE'    event."
        from idlelib import help_about
        help_about.AboutDialog(root)
    def config_dialog(event=None):
        "Handle    Options    'Configure    IDLE'    event."
        from idlelib import configdialog
        root.instance_dict = flist.inversedict
        configdialog.ConfigDialog(root, 'Settings')
    def help_dialog(event=None):
        "Handle    Help    'IDLE    Help'    event."
        from idlelib import help
        help.show_idlehelp(root)
    root.bind('<<about-idle>>', about_dialog)
    root.bind('<<open-config-dialog>>', config_dialog)
    root.createcommand('::tk::mac::ShowPreferences', config_dialog)
    if flist:
        root.bind('<<close-all-windows>>', flist.close_all_callback)
        root.createcommand('exit', flist.close_all_callback)
    if isCarbonTk():
        menudict['application'] = menu = Menu(menubar, name='apple', tearoff=0)
        menubar.add_cascade(label='IDLE', menu=menu)
        mainmenu.menudefs.insert(0, ('application', [('About    IDLE', '<<about-idle>>'), None]))
    if isCocoaTk():
        root.createcommand('tkAboutDialog', about_dialog)
        root.createcommand('::tk::mac::ShowHelp', help_dialog)
      ...

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def overrideRootMenu(root, flist):