为什么我的回复是循环而不是整个程序

Question

有人可以帮我解决我的代码问题吗？最后通过代码的回复只是循环而不是完全重新开始程序会很棒有人可以帮助我谢谢，我知道它非常基本，也许不是最好的方法这样做，但只要它工作正常。

start = input("Do you want to make an order? ")
while start == "Y" or start == "y" :
    title = input("Enter book title: ")
    sPrice = float(input("Enter price of book: "))
    voucher = input("Do you have a voucher? ")    
    while sPrice >0 :
        amount = float(input("Enter amount of books: "))
        while amount >= 1 and amount <= 80 :
            if amount >= 5 and amount <= 10 :
                disc = 5
            elif amount >= 11 and amount <= 50 :
                disc = 7.5
            elif amount >= 51 and amount <= 80 :
                disc = 10
            else :
                disc = 0
            base = sPrice * amount
            discVal = (base * disc) / 100
            dPrice = base - discVal


            if voucher == "Y" or voucher == "y" and dPrice >= 25 :
                voucherValue = 25
            else :
                voucherValue = 0
            fPrice = dPrice - voucherValue
            print (f"Discount rate: {disc}%")
            print (f"Discount value: £{discVal:.2f}")
            print (f"Total before discount: £{base:.2f}")
            print (f"Total after discount: £{dPrice:.2f}")
            if voucher == "Y" or voucher == "y" and dPrice >= 25 :
                print (f"Value of voucher: £{voucherValue:.2f}")
            print (f"Final cost of order: £{fPrice:.2f}")
        else :
            print ("ERROR - Invalid amount!")
            amount = float(input("Enter amount of books: "))
    else :
        print ("ERROR - Price too low!")
        sPrice = float(input("Enter price of book: "))
else :
    start = input("Do you want to make an order? ")

Answer 1

您需要在两个位置包含if 以验证输入值。

将while sPrice >0 : 更改为if sPrice >0 : 并将while amount >= 1 and amount <= 80 : 更改为if amount >= 1 and amount <= 80 :