Python购物车程序（菜鸟版）

程序练习 

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，打印已购买商品和余额

product_list = [
    ('Iphone', 5000),
    ('Mac Pro', 9800),
    ('Bike', 800),
    ('Watch', 10600),
    ('Coffee', 31),
    ('Lpython', 120),
]
shopping_list = []
salary = input("Input your salary: ")
if salary.isdigit():
    salary = int(salary)
    while True:
        # for item in product_list:
        #     print(product_list.index(item),item)
        for index,item in enumerate(product_list):
            print(index,item)
        user_choice = input("选择要买嘛? >>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary: # 买得起
                    shopping_list.append(p_item)
                    salary -=p_item[1]
                    print("Added %s into shoping cart, your current is \033[31;0m %s \033[0m" %(p_item,salary))
                else:
                    print("\033[41;1m你的余额只剩[%s]啦，还买个毛线啊\033[0m"%salary)
            else:
                print("product code [%s] is not exist!"%user_choice)
        elif user_choice == "q":
            print("---------shopping list---------")
            for p in shopping_list:
                print(p)
            print("You current balance:",salary)
            exit()
        else:
            print("invalid option")