模拟购物车

商品清单，购物清单

procuct_name1=[["苹果7 Plus",5700],
               ["小米5 Plus",2600],
               ["华为P10",4088],
               ["锤子M1",2499],
               ["魅族6 Plus",2999]]
shopping_cart = []  #购物车
shopping_name=[]    #选购的商品名
expense = 0         #总消费



#首页
print("欢迎来到手机大卖场!!!!!")
salary = int(input("请输入您携带的现金：").strip())
print("下面是本店的商品列表:
---------------------------")

#开始购物。
while  True :
    # 将商品清单取出和价钱匹配排列。
    print("{0:4}{1:9}{2:9}".format("编号","商品名","单价"))
    for i in range(0, len(procuct_name1)):
        print(("{0:^4}{1:9}{2:6}" .format((i+1),procuct_name1[i][0], procuct_name1[i][1])))
    else:
        print("---------------------------")
    choice=input("请输入您想购买的商品编号:（如果想退出商店请输入：q）").strip()
    if choice.isdigit():
        choice=int(choice)
    elif choice=="q":
        break
    else:
        print("没有此选项！")
        continue

    if choice > len(procuct_name1) or choice <0:
        print("请输入正确的商品编号!")
    else:
        money = procuct_name1[choice-1][1]
        if money > salary:
            diff = money - salary
            print("您不能购买本商品，您的余额为：%d   还差 %d" % (salary,diff))
        else:
            if procuct_name1[choice-1][0] in shopping_name:
                i = shopping_name.index(procuct_name1[choice-1][0])
                shopping_cart[i][2] = shopping_cart[i][2] + 1
            else:
                shopping_cart.append(procuct_name1[choice - 1])
                shopping_cart[len(shopping_cart)-1].append(1)
                shopping_name.append(procuct_name1[choice-1][0])
            salary = salary - money
            expense += money
            print("购物成功！ 余额为： %d" % salary)

#结账。打印购物清单。
if len(shopping_cart) == 0:
    print("欢迎下次光临！")
else:
    print("---------------------------")
    print("您本次购买的商品：")
    print("{0:4}{1:9}{2:9}{3:9}{4:9}".format("编号", "商品名", "单价","数量","总价"))
    for i in range(0,len(shopping_cart)):
        total = shopping_cart[i][1]*shopping_cart[i][2]
        print(("{0:^4}{1:9}{2:6}{3:9}    {4:9}".format((i + 1),
                                                       shopping_cart[i][0],
                                                       shopping_cart[i][1],
                                                       int(shopping_cart[i][2]),total)))
    else:
        print("总消费：%d         余额为：%d" %  (expense,salary))
        print("欢迎下次光临！
--------------------------------")