def main():
all_menus = Menu('All', 'it is all menu')
lunch_menu = Menu('Lunch', 'it is lunch menu')
dinner_menu = Menu('Dinner', 'it is dinner menu')
drink_menu = Menu('Drink', 'it is drink menu')
dessert_menu = Menu('Dessert', 'it is dessert menu')
all_menus.add_child(lunch_menu)
all_menus.add_child(dinner_menu)
lunch_menu.add_child(MenuItem('beef', '240', 'pan-fried steak'))
lunch_menu.add_child(drink_menu)
drink_menu.add_child(MenuItem('milk tea', '50', 'milk tea without sugar'))
dinner_menu.add_child(MenuItem('salmon', '340', 'pan-fried salmon'))
dinner_menu.add_child(MenuItem('whole wheat bread', '50',
'for vegetarian'))
dinner_menu.add_child(dessert_menu)
dessert_menu.add_child(MenuItem('Waffle', '100', 'delicious'))
waiter = Waiter(all_menus)
waiter.show_menu()
def main():
waiter = Waiter(LunchMenu(), DinnerMenu())
waiter.show_menu()
