python作业2 购物车

#__Author__: "Miny Dong"
#__Date__: 2019/2/26  20:36

products_list = [
    ('book',100),
    ('Apple',6000),
    ('clothes',200),
    ('watch',2000),
    ('Mac Pro',8000),
]
#打印商品内容
for i,v in enumerate(products_list):
    print(i,v)

salary = int(input("请输入您的薪资总数："))

#购物车
shopping_chart = []

#输入购买编号，循环输入，直到输入命令退出
while True:
    user_choice = input("请输入商品编号(退出请输入q)：")
    # 验证输入是否合法
    if user_choice.isdigit():
        user_choice = int(user_choice)
        if (user_choice < len(products_list)) and (user_choice >= 0):
            product_name = products_list[user_choice][0]
            price = products_list[user_choice][1]
            if price < salary:
                shopping_chart.append(products_list[user_choice])
                salary = salary - price
                print("%s已经加入到购物车，当前账户余额为%d" % (product_name, salary))
            else:
                print("您的账户余额不足，余额%d元人民币。" % (salary - price))
        else:
            print("----请输入正确的编号(编号范围为0—%s)----" % str(len(products_list)-1))
    elif user_choice=="q":
        print("----------您已购买以下商品----------")
        # 循环遍历购物车里的商品，购物车存放的是已买商品
        for i in shopping_chart:
            print(i)
        print("您的余额为：%s" % salary)
        break
    else:
        print("无效的输入")