Python 简单购物车

product_list =[
    ('huawei',3000),
    ('hongmiNote3',3000),
    ('sanxing',2600),
    ('ThinkPad870',15000),
    ('Iphone8',5600),
    ('HuaweiP20',3300)
]#商品列表
shopping_list = []#购物清单
while True:
    salary = input('Input you salary:') #输入薪水
    if salary.isdigit():        #判断输入的薪水是否是数字
        salary = int(salary)
        while True:
            for index,item in enumerate(product_list):          #打印商品列表
                print(index,item)
            user_choice = input('你要买什么？（退出请输入quit）：')   #输入商品序列号
            if user_choice.isdigit():
                user_choice = int(user_choice)
                if user_choice < len(product_list) and user_choice > 0: #判断商品序列号是否在商品列表中
                    p_item = product_list[user_choice]
                    if p_item[1] <= salary: #判断是否买得起
                        shopping_list.append(p_item)
                        salary -= p_item[1]
                        print('Added %s into shopping car,your current balance is \033[31;1m%s\033[0m' %(p_item,salary))
                    else:
                        print("\033[41;1m你的余额只剩[%s]啦\033[0m" % salary)
                else:
                    print('product_code [%s] is not excit'% user_choice)
            elif user_choice == 'quit':
                print('------shopping list-------')
                for i in shopping_list:
                    print(i)
                print('your current balance:%s' % salary)
                exit()
            else:
                print('input true product_code,product_code is a number')
            # break
    else:
        print('请正确输入你的薪水')