Is it possible to limit the number of coroutines running corcurrently in asyncio?

Question

I already wrote my script using asyncio but found that the number of coroutines running simultaneously is too large and it often ends up hanging around.

So I would like

Answer 1

I can suggest using asyncio.BoundedSemaphore.

import asyncio

async def my_func(player, asyncio_semaphore):
    async with asyncio_semaphore:
        # do stuff

async def main():
    asyncio_semaphore = asyncio.BoundedSemaphore(200)
    jobs = []
    for i in range(12000):
        jobs.append(asyncio.ensure_future(my_func(players[i], asyncio_semaphore)))
    await asyncio.gather(*jobs)

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.set_debug(True)
    loop.run_until_complete(main())

This way, only 200 concurrent tasks can acquire semaphore and use system resources while 12000 tasks are at hand.