python第二天

#购物车实例
#Author:ge jian

product_list = [
    (‘iphone‘,5800),
    (‘Mac‘,9800),
    (‘Bike‘,800),
    (‘Watch‘,2800),
    (‘Coffee‘,58),
    (‘Alex python‘,158),
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            # print(product_list.index(item)+1,item) enumerate用法
             print(index,item)
        user_choice = input("选择要买什么？>>>:")
        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:
                    shopping_list.append(p_item)
                    salary -=p_item[1]
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(p_item,salary))
                else:
                    print("\033[35;1m你的余额只剩[%s],还买个毛线呀\033[0m" % salary)

            else:
                print("所选择的商品不存在，请重新输入")
        elif user_choice == ‘q‘:
            print(‘----------shopping List-----------‘)
            for p in shopping_list:
                print(p)
            print("Your current balance:%s"%salary)
            exit()
        else:
            print(‘invalid option‘)