简单购物车

#!/usr/bin/env python
# -*- coding:utf-8 -*-

# a = [1,2,3]
# for i in enumerate(a)
#     print(i)

product_list = [
    ('ipthon', 5800),
    ('mac pro', 9800),
    ('bike', 800),
    ('watch', 10600),
    ('coffee', 31),
    ('alex python', 120),
]
shopping_list = []
salary = input("input your salary: ")  # 输入工资
if salary.isdigit():  # 判断输入的工资是不是数字
    salary = int(salary)  # 如果是数字给他int

    while True:  # 进入死循环
        for index,item in enumerate(product_list):  # 打印商品列表 enumerate把列表的下标直接给取出来
            # print(product_list.index(item),item)
            print(index, item)

        user_choice = input("选择商品？>>>： ")
        if user_choice.isdigit():  # 判断用户输入的必须是数字类型
            user_choice = int(user_choice)  # 是数字进入商品的选择
            if user_choice < len(product_list) and user_choice >= 0:  # 判断商品 总共5个 要是输入10个找不到
                p_item = product_list[user_choice]  # 通过下标吧商品取出来
                if p_item[1] <= salary:  # 买得起
                    shopping_list.append(p_item)  # 买得起 就添加到list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 exit!"% user_choice)  # 输入的商品不存在 退出
        elif user_choice == 'q':
            print("-----------shopping list ----------")
        for p in shopping_list:
            print(p)
            print("your current balance:", salary)
            exit()
        else:
            print("invalid option")