调用`async for in`后如何获取异步生成器的下一次迭代

import asyncio

# 定义一个异步生成器
async def my_generator():
    yield 1
    yield 2
    yield 3

# 转换为异步迭代器
my_iterator = asyncio.aiter(my_generator())

async def main():
    try:
        # 获取异步迭代器的下一个值
        value = await asyncio.anext(my_iterator)
        print(value)  # 输出: 1
        
        value = await asyncio.anext(my_iterator)
        print(value)  # 输出: 2
        
        value = await asyncio.anext(my_iterator)
        print(value)  # 输出: 3
        
        # 异步迭代结束后，抛出StopAsyncIteration异常
        value = await asyncio.anext(my_iterator)  # 抛出StopAsyncIteration异常
    except StopAsyncIteration:
        print("迭代结束")

asyncio.run(main())