可否不用 class def __init__ 等描述迭代器，用简单的列表等写迭代器代码吧，以及生成器 装饰器

当然可以，以下是使用列表实现的迭代器、生成器和装饰器示例： 1. 迭代器 ```python my_list = [1, 2, 3] my_iterator = iter(my_list) while True: try: item = next(my_iterator) print(item) except StopIteration: break ``` 输出： ``` 1 2 3 ``` 2. 生成器 ```python def my_generator(data): for item in data: yield item * 2 my_data = [1, 2, 3] my_generator_obj = my_generator(my_data) for item in my_generator_obj: print(item) ``` 输出： ``` 2 4 6 ``` 3. 装饰器 ```python def my_decorator(func): def wrapper(): print("Before function call") func() print("After function call") return wrapper @my_decorator def say_hello(): print("Hello") say_hello() ``` 输出： ``` Before function call Hello After function call ```