20190414 购物车模块

product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',81)
]
shopping_list = []
salary = input('Input your salary:')
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            #打印商品列表
            print(index,item)
        user_choice = input('选择要买吗？>>>:')
        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 your shopping cart,your current balance is \033[31;1m%s\033[0m' %(p_item,salary))
                else:
                    print('你的余额只剩\033[31;1m[%s]\033[0m了，还买个毛线啊！' %(salary))
            else:
                print('product code [%s] is exsit!' %(user_choice))
        elif user_choice == 'q':
            print('-----shopping list-----')
            for p in shopping_list:
                print(p)
                print('your current balance:',salary)
                print("Thank's you")
                exit()
        else:
            print('invalid option')

print('invalid option')