>>> m1 = DictMenu(dict.d)
>>> m2 = DictMenu({'eggs': lambda:0, 'toast': lambda:1})
>>> m1.run()

        MENU...
                ham
                spam
?<ctrl-d>
>>> m2.run()

        MENU...
                eggs
                toast
?<ctrl-d>
>>> m3 = m1 + m2
>>> m3.run()

        MENU...
                eggs
                ham
                spam
                toast
?toast
>>>