Multi-level menu exercises

Three-level menu

1. Print a menu, select items
2. Print the secondary menu, select items
3. After printing three-level menu, select the item to exit the program
4. B return to the previous menu selection
5. Select q to exit the program

= {the MENU 
    "barbecue": { 
        "beef": [ "cow streaky", "cow rib"], 
        "lamb": [ "Kebab", "big fat kidneys"], 
        "fish": [ "grilled salmon head "," roast saury "] 
    }, 
    " sushi ": { 
        " sushi ": [" salmon sushi "," tuna sushi "], 
        " sushi ship ": [" salmon ship "," ship tuna " ], 
        "sashimi": [ "sashimi tuna", "red shell sashimi"] 
    }, 
    "beverage": { 
        "wine": [ "Bordeaux", "Cabernet Sauvignon"], 
        "beer": [ "Asahi", "Kirin"], 
        "sake": [ "The pine", "burning taro"] 
    } 

} 
the while True: 
    for I in MENU:
        Print (i) 
    Choice1 the INPUT = ( "Enter your choice: (q Exit)") 
    IF Choice1 in the MENU: 
        the while True: 
            for i2 in the MENU [Choice1]: 
                Print (i2)
            choice2 = input ( "Enter your choice: (b returns q to quit)") 
            IF Choice2 in MENU [Choice1]: 
                the while True: 
                    for I3 in MENU [Choice1] [Choice2]: 
                        Print (I3) 
                    Choice3 = INPUT ( "input your selection: (b q return quit) ") 
                    IF Choice3 == 'B': 
                        BREAK 
                    elif Choice3 == 'q': 
                        exit () 
                    the else: 
                        Print (" you point S% "Choice3%) 
                        BREAK 
            elif Choice2 = = 'B': 
               BREAK 
            the else: 
                quit () 
    the else:
        quit()