Python -----购物车

# Author:Yan
product_list = [
    ('iphone',5800), ('Mac',9800), ('Watch',6800), ('Bike',900), ('Coffee',700), ('Book',80),
]
shop_list = []
salary = input("Input your salary:")
if salary.isdigit():  #判断是否为整数
    salary = int(salary)
    while True:#
        '''for i in product_list:
            print(product_list.index(i),i)
        break'''
        for index,i in enumerate(product_list):#获取下标enumerate
            print(index,i)
        user_choice = input("选择商品序号：")
        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
                    shop_list.append(p_item)
                    salary -= p_item[1]
                    print("Added %s into shopping cart, your current balance is %s"%(p_item,salary))
                else:
                    print("not enought")
        elif user_choice =='q':
            print('exit..')
            for p in shop_list:
                print(p)
                exit()
        else:
            print("in)valid option"