python面试题常考的超市购物车系统

author = "superman"


product_list = [
    (‘Iphone‘,5800),
    (‘Mac Pro‘,9800),
    (‘Bike‘,800),
    (‘Watch‘,10600),
    (‘Coffee‘,31),
    (‘Alex Python‘,120),
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():            #判断工资是不是数字
    salary = int(salary)         #如果是数字就用Int的数据类型
    while True:                #进入死循环
        for index,item in enumerate(product_list):    #打印商品列表
            #print(product_list.index(item),item)
            print(index,item)
        user_choice = input("选择要买嘛？>>>:")
        if user_choice.isdigit():           #判断工资是数字类型
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >=0:        #判断商品元素数量
                p_item = product_list[user_choice]           #通过下标索引把商品取出来
                if p_item[1] <= salary:                 #买的起
                    shopping_list.append(p_item)             #能买得起就把商品添加到列表里
                    salary -= p_item[1]                    #扣钱
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(p_item,salary) )
                else:
                    print("\033[41;1m你的余额只剩[%s]啦，还买个毛线\033[0m" % salary)
            else:
                print("product code [%s] is not exist!"% user_choice)      #输入的商品序号不存在
        elif user_choice == ‘q‘:
            print("--------shopping list------")
            for p in shopping_list:
                print(p)
            print("Your current balance:",salary)
            exit()
        else:
            print("invalid option")