Question

您好我是python编程的新手。我刚开始学习python。我需要一些关于如何构建以下程序的想法/部分代码。任何想法都表示赞赏。我必须得到以下输出。

----- Welcome to my checkout! -----
Please enter the barcode of your item: 123
Milk, 2 Litres - $2.0
Would you like to scan another product? (Y/N) y
Please enter the barcode of your item: 456
Bread - $3.5
Would you like to scan another product? (Y/N) y
Please enter the barcode of your item: 999
This product does not exist in our inventory.
Would you like to scan another product? (Y/N) n
Payment due: $5.5. Please enter an amount to pay: 5
Payment due: $0.5. Please enter an amount to pay: -3
We don't accept negative money!
Payment due: $0.5. Please enter an amount to pay: 2
----- Final Receipt -----
Milk, 2 Litres $2.0
Bread $3.5
Total amount due: $5.5
Amount received: $7.0
Change given: $1.5
Thank you for shopping at mytsore!
(N)ext customer, or (Q)uit? q

我到现在所做的是：

items = {'banana': {'price': 4,   'stock': 6, 'code':123 },
         'apple':  {'price': 2,   'stock': 0,'code':1231 },
         'orange': {'price': 1.5, 'stock': 32,'code':1233},
         'pear':   {'price': 3,   'stock': 15,'code':12335},
        }

bar=int(input("enter barcode:"))
sum = 0
price =[]
products =[]
for key in items:
    if items[key]['code'] == int(bar):
        print("item found")
        print (key)
        print ("price: %s" % items[key]['price'])
        print ("stock: %s" % items[key]['stock'])
        print ("Barcode: %s" % items[key]['code'])
        price.append(items[key]['price'])
        products.append(key)

        print(price)
        print(products)
        print("..............................................")
        while True:

            choice = input("scan another item?y/n")
            if choice =='n':
                for cost in price:
                    sum += cost
                    print("Total cost:",sum)
                    print("..............................................")


            if choice =='y':


                bar=int(input("enter barcode:"))


                for key in items:

                    if items[key]['code'] == int(bar):
                        print("item found")
                        print (key)
                        print ("price: %s" % items[key]['price'])
                        print ("stock: %s" % items[key]['stock'])
                        print ("Barcode: %s" % items[key]['code'])
                        price.append(items[key]['price'])
                        products.append(key)
                    #print(price)

如果用户选择'n'程序应该停止并生成带有价格的账单/收据。即使我按'n'选项，我仍然会收到消息“扫描另一个项目？y / n”）“。如何构建我的代码以获得低于预期的输出？我希望将我的代码包装在函数内并使用OOP概念创建实例

Answer 1

如果条件：

，

缺少中断

while True:
        choice = input("scan another item?y/n")
        if choice =='n':
            for cost in price:
                sum += cost
                print("Total cost:",sum)
                print("..............................................")
        break

Answer 2

items = {'banana':{'price': 4,   'stock': 6, 'code':123 },
         'apple':{'price': 2,   'stock': 0,'code':1231 },
         'orange':{'price': 1.5, 'stock': 32,'code':1233},
         'pear':{'price': 3,   'stock': 15,'code':12335},}

bar=int(input("enter barcode:"))
sum = 0
price =[]
products =[]
for key in items:
    if items[key]['code'] == int(bar):
        print("item found")
        print (key)
        print ("price: %s" % items[key]['price'])
        print ("stock: %s" % items[key]['stock'])
        print ("Barcode: %s" % items[key]['code'])
        price.append(items[key]['price'])
        products.append(key)

        print(price)
        print(products)
        print("..............................................")
        while True:

            choice = input("scan another item?y/n")
            if choice =='y':
                bar=int(input("enter barcode:"))
                for key in items:

                    if items[key]['code'] == int(bar):
                        print("item found")
                        print (key)
                        print ("price: %s" % items[key]['price'])
                        print ("stock: %s" % items[key]['stock'])
                        print ("Barcode: %s" % items[key]['code'])
                        price.append(items[key]['price'])
                        products.append(key)
                        #sum += items[key]['çost']
                    #print(price)
            if choice =='n':
                for cost in price:
                   sum += cost
                   break
                print("Total cost:",sum)
                print("..............................................")
            break

超市结帐与python

2 个答案: