购物车代码

需求：购物车程序 购买这些东西"iphone","coffee","book","cup" 对应的价格是4200,30,50,300 买不起，打印差多少钱 放入购物车，扣钱，同时打印余额 选择不买了，打印购买的商品列表、价格和余额

Products=["iphone","coffee","book","cup"]#商品列表
Price=[4200,30,50,300]                      #产品价格表
Salary=int(input("input your salary:"))  #输入工资
count=0                                   #统计买了的商品数量
Your_Shopping_Cart=[ ]                     #购买了的商品列表
Your_Price=[]                              #购买了的商品价格列表
Your_Price_Totel = 0                       #购买了的商品总价
while True:
    print("序号", "商品", "价格")
    for a in range(0, len(Products)):
        print("%d   %-7s    %s"%(a + 1,Products[a], Price[a]))
    Choice = input(">>:").strip()
    if Choice.isdigit():#判断输入是否为整数
        Choice = int(Choice)
        #选择购买的商品
        if Choice >=1 and Choice <= len(Products):
            if Price[Choice-1]<=  Salary:
                Your_Shopping_Cart.append(Products[Choice - 1])
                # 将购买的商品名字追加进购买了的商品列表
                Your_Price.append(Price[Choice - 1])
                # 将选择的商品元素的价格追加进购买了的商品价格列表
                Salary -=  Price[Choice-1]
                print("你选的商品"+Products[Choice-1]+"已放入购物车,你的余额为:",Salary)
                #统计出余额剩多少
            else:
                print("余额不够，商品价格是"+str(Price[Choice-1])+"，你还差"+str(Price[Choice-1]-Salary))
        else:
            print("商品不存在！")
    elif Choice == "no":
        print("-------以购买的商品列表--------")
        print("%s    %8s    %8s    %8s    %8s"%("序号", "商品", "数量", "单价", "总价"))
        New_Your_Shopping_Cart=[]                       #
        for a in Your_Shopping_Cart:                   #
            if a not in New_Your_Shopping_Cart:       #
                New_Your_Shopping_Cart.append(a)      #购物车去重
        New_Your_Price=[]
        for a in Your_Price:
            if a not in New_Your_Price:
                New_Your_Price.append(a)             #价格表去重
        for a in  New_Your_Shopping_Cart:
            index=0
            print("%-10s    %-13s    %-8s    %-13s    %-12s"%(index+1,a,Your_Shopping_Cart.count(a),New_Your_Price[index],Your_Shopping_Cart.count(a)*New_Your_Price[index]))#打印出购买了的商品和价格
            index+=1
        print("你的余额为：", Salary)
        break
    else:
        print("无此选项！")