What are the differences between Python async iterators and generators?

What are the differences between Python async iterators and generators?

Python async iterators allow asynchronous iteration, while generators are synchronous. Async iterators use 'async for'.

Can you give me an example of an async iterator?

Sure! Here's a simple async iterator example:

import asyncio

class AsyncCounter:
    def __init__(self, max):
        self.max = max
        self.count = 0

    async def __aiter__(self):
        return self

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

async def main():
    async for number in AsyncCounter(3):
        print(number)

asyncio.run(main())

How do I convert a generator to an async iterator?

You can use the asyncio.to_thread() function to run a synchronous generator in an async context. Here's an example:

import asyncio

def sync_gen():
    for i in range(3):
        yield i

async def async_iter():
    for value in await asyncio.to_thread(sync_gen):
        yield value

async def main():
    async for number in async_iter():
        print(number)

asyncio.run(main())