python:购物车小程序

购物车程序：

需求：1、启动程序后，让用户输入工资，然后打印商品列表

         2、允许用户根据商品编号购买商品

         3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒

         4、可随时退出，退出时打印已商品和余额

shopping1.0：自己瞎几把写也大概写出来了

money = int(input("you have the money:"))


shop = [1,'IPHONE',5000, 2,"STARBUCKS-LATTE",31, 3,"MACPRO",12000, 4,"BICYCLE",1000]
shop2= []

print(shop)
while money >= 31:
    number = int(input(">>>"))
    print(shop[shop.index(number)+2])

    if money < shop[shop.index(number)+2]:
        print("you don't have enough money")
        break
    else:
        money = money-shop[shop.index(number)+2]
        print("you salary is :", money)
        shop2.append(shop[shop.index(number)+1])
        shop2.append(shop[shop.index(number)+2])
        print("you buy:", shop2)

else:
    print("you cannot buy anything）

执行结果

功能不太完善，打印列表的方式不行，也没考虑到非法输入的问题

进化后的2dian0

products_list = [
    ("IPHONE", 5000),
    ("MAC PRO",12000),
    ("BIKE", 800),
    ("WATCH", 1000),
    ("STARBUCKS", 31)
]

user_choose_list = []

salary = input("Please input you salary:")

# 判断输入是不是整数
if salary.isdigit():
    salary = int(salary)
    while True:
        # 打印商品编号和商品信息
        for index, item in enumerate(products_list):
            print(index, item)
        # 用户输入商品编号
        products_id = input("Please choose products_id:")
        # 判断商品编号是不是整数
        if products_id.isdigit():
            products_id = int(products_id)
            # 判断输入的整数编号是否在规定范围内
            if 0 <= products_id < len(products_list):
                p_item = products_list[products_id]
                # 判断工资数额够不够买商品编号对应的商品
                if p_item[1] <= salary:
                    # 将买入的商品加入到新的列表中，工资减掉买到的商品价格，并打印购买信息
                    user_choose_list.append(p_item)
                    salary = salary-p_item[1]
                    print("Added %s in your shopping cart,your current balance is %s" % (p_item, salary))
                # 不够买对应编号的商品就打印提示
                else:
                    print("you have salary:", salary)
            else:
                print("Product code[%s] is not exist!" % products_id)
        elif products_id == "q":
            print("------shopping_list------")
            for p in user_choose_list:
                print(p)
            print("Your current balance:", salary)
            exit()
        else:
            print("Invalid input")

else:
    print("Invalid input")