使用try-except规则索引错误？

Question

我的索引错误有问题。下面的代码基本上要求客户为他们选择的比萨饼输入相应的编号（在此之前会打印一份带有索引编号的比萨饼列表）。我想这样做，如果客户输入的编号高于12，这是列表中最高的比萨饼编号，它会要求您再次输入相应的编号，如果这有道理的话。我听说你可以尝试除了错误，但我真的不知道怎么做

   pizzaItem = int(input("Please enter the corresponding number to your pizza choice: "))
    print("You have added", pizzaMenu[pizzaItem]  , "to your order")
    pizzaOrder.append(pizzaMenu[pizzaItem])
    while len(pizzaOrder) != customerPizzaNumber:
            pizzaItem = int(input("Please enter the corresponding number to your pizza choice: "))
            print("You have added", pizzaMenu[pizzaItem] , "to your order")
            pizzaOrder.append(pizzaMenu[pizzaItem])
    print(" ")
    print("Thanks for chosing your pizzas. Here is your current order:")

Answer 1

添加此输入检查-它将重复此过程，直到用户输入低于12的数字：

pizzaItem = None
while pizzaItem is None:
    pizzaItem = input("Please enter the corresponding number to your pizza choice: "))
    if not (pizzaItem.isdigit() and 0 <= int(pizzaItem) <= len(pizzaMenu)):
        pizzaItem = None
    else:
        pizzaItem = int(pizzaItem)

print("You have added", pizzaMenu[pizzaItem]  , "to your order")