What are advanced async iterables in Python?

What are advanced async iterables in Python?

Advanced async iterables in Python allow you to work with asynchronous data streams using the async for syntax.

Can you give me an example of how to use async iterables?

Sure! Here's a simple example:

import asyncio

class AsyncIterable:
    def __init__(self, n):
        self.n = n

    def __aiter__(self):
        self.current = 0
        return self

    async def __anext__(self):
        if self.current < self.n:
            await asyncio.sleep(1)  # Simulate an async operation
            self.current += 1
            return self.current
        else:
            raise StopAsyncIteration

async def main():
    async for number in AsyncIterable(5):
        print(number)

asyncio.run(main())

What happens if I try to iterate over it multiple times?

If you try to iterate over the same async iterable instance multiple times, you'll get a StopAsyncIteration error after the first complete iteration. Each iteration is independent, so you should create a new instance for each iteration.

Are there any built-in async iterables in Python?

Yes, Python's asyncio library provides built-in async iterables like asyncio.Queue and asyncio.StreamReader, which can be very useful for handling asynchronous data.