我无法验证我的代码.我需要循环我的代码，直到输入有效答案为止 [英] I am having trouble vaildating my code.I need my code to loop untill a valid answer is inputted

问题描述

我正在努力处理这段Python代码.问题是，当用户输入错误时，我需要我的代码保持循环，直到他们输入有效答案为止. 代码应该这样工作:提示用户选择饮料，然后是美食，然后是菜式.此后，程序将显示用户想要的顺序.

I am struggling with this piece of Python code. The problem is,when a user enters something wrong I need my code to keep looping until they input a valid answer. This is how the code is supposed to work: User is prompted to choose a drink, then a cuisine, then a dish. After this, the program displays the order the user wanted.

Order = [ 'No drink', 'No food' ]
Yesses = [ 'y', 'yes', 'yep', 'okay', 'sure' ]
DRINK = 0
FOOD = 1

print("Welcome to Hungary house!")

print("")
print("First, let me get your drink order, if any.")

answer = input("Would you like something to drink? ").lower()

if answer in Yesses:
    print("What drink would you prefer?")
    print ("1: Fanta")
    print ("2: Coke")
    print ("3: Pepsi")
    print ("4: Sprite")

    choice = input("Please enter a drink from the menu above\n").lower()

    if choice == "1" or choice == "fanta":
        Order[DRINK] = "Fanta"
    if choice == "2" or choice == "coke":
        Order[DRINK] = "Coke"
    if choice == "3" or choice == "pepsi":
        Order[DRINK] = "Pepsi"
    if choice == "4" or choice == "sprite":
        Order[DRINK] = "Sprite"

print ("You have chosen: " + Order[DRINK])

print("")
print("Now, let me get your food order, if any.")

answer = input("Do you want any food (Y/N)? ").lower()
if answer in Yesses:
    answer = input("Do you want Italian,Indian or Chinese food?\n").lower()

    if answer == "indian":
        answer = input("Do you want Curry or Onion Bhaji?\n").lower()

        if answer == "curry":
            Order[FOOD] = "Curry"

            answer = input("With your curry, do you want Rice or Naan?\n").lower()
            if answer == "rice":
                Order.append("- with rice")
            if answer == "naan":
                Order.append("- with naan")

        if answer == "onion bhaji" or answer == "bhaji":
            Order[FOOD] = "Onion Bhaji"

            answer = input("With your bhaji, do you want Chili or Peppers?\n").lower()
            if answer == "chili":
                Order.append("- with chili")
            if answer == "peppers":
                Order.append("- with peppers")
    if answer == "chinese":
        answer = input("Do you want Chicken Wings or Noodles?\n").lower()

        if answer == "chicken wings" or answer == "wings":
            Order[FOOD] = "Chicken Wings"

            answer = input("With your wings, do you want Chips or Red Peppers?\n").lower()
            if answer == "chips":
                Order.append("- with Chips")
            if answer == "red peppers" or answer == "peppers":
                Order.append("- with Red Peppers")

        if answer == "noodles":
            Order[FOOD] = "Noodles"

            answer = input("With your noodles, do you want Meatballs or Chicken?\n").lower()
            if answer == "meatballs":
                Order.append("- with meatballs")
            if answer == "chicken":
                Order.append("- with chicken")
    if answer == "italian":
        answer = input("Do you want Pasta or Noodles?\n").lower()

        if answer == "pasta" or answer == "Pasta":
            Order[FOOD] = "Pasta"

            answer = input("With your Pasta, do you want Vegetarian Toppings or meat toppings?\n").lower()
            if answer == "vegetarian Toppings":
                Order.append("- with Vegetarian Toppings")
            if answer == "meat toppings" or answer == "meat":
                Order.append("- with Meat toppings")

        if answer == "pizza":
            Order[FOOD] = Pizza

            answer = input("With your Pizza, do you want Grilled chicken or Chicken?\n").lower()
            if answer == "Grilled chicken":
                Order.append("- Grilled chicken")
            if answer == "seasonal vegetables":
                Order.append("- seasonal vegetables")                

try:
    if Order[2]:
        print("You have ordered the following. Your order number is 294")
        print("")
        print("    ", Order[DRINK])
        print("    ", Order[FOOD])
except:
    pass

try:
    if Order[2]:
        print("    ", Order[2])
except:
    print("")
    print("No food or drink?! Get out!")

try:
    if Order[2]:
        print("""
        Your order should arrive within 10-50 minutes. If you wish to cancel,
        please contact us at 077 3475 8675309. Thank you for your patronage!
        """)
except:
    pass

推荐答案

更新:

这是代码的第一部分，带有while (condition):

Here is the first part of your code with a while (condition):

Order = [ 'No drink', 'No food' ]
Yesses = [ 'y', 'yes', 'yep', 'okay', 'sure' ]
DRINK = 0
FOOD = 1

print("Welcome to Hungary house!")

print("")
print("First, let me get your drink order, if any.")

answer = input("Would you like something to drink? ").lower()

if answer in Yesses:
    print("What drink would you prefer?")
    print ("1: Fanta")
    print ("2: Coke")
    print ("3: Pepsi")
    print ("4: Sprite")

        correct = False

    while (!correct):
        choice = input("Please enter a drink from the menu above\n").lower()

        if (choice == "1" or choice == "fanta"):
            Order[DRINK] = "Fanta"
            correct = True
        elif (choice == "2" or choice == "coke"):
            Order[DRINK] = "Coke"
            correct = True
        elif (choice == "3" or choice == "pepsi"):
            Order[DRINK] = "Pepsi"
            correct = True
        elif (choice == "4" or choice == "sprite"):
            Order[DRINK] = "Sprite"
            correct = True


print ("You have chosen: " + Order[DRINK])

原始答案: 因此，如果使用的是input()，则可以执行while循环直到语句为真.因此，将所有代码放入循环中，并在正确时实现布尔值.例如:

Original answer: So if it's using input() you can get away with doing a while loop until the statement is true. So put all the code in a loop and fulfill the Boolean when correct. For example:

correct = false
while (!correct):
    var = input ("your statement")
    if var == "good":
        correct = true
#next stuff

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