Hi, I've updated PEP 525 with a new section about asyncio changes. Essentially, asyncio event loop will get a new "shutdown_asyncgens" method that allows to close the loop and all associated AGs with it reliably. Only the updated section is pasted below: asyncio ------- The asyncio event loop will use ``sys.set_asyncgen_hooks()`` API to maintain a weak set of all scheduled asynchronous generators, and to schedule their ``aclose()`` coroutine methods when it is time for generators to be GCed. To make sure that asyncio programs can finalize all scheduled asynchronous generators reliably, we propose to add a new event loop method ``loop.shutdown_asyncgens(*, timeout=30)``. The method will schedule all currently open asynchronous generators to close with an ``aclose()`` call. After calling the ``loop.shutdown_asyncgens()`` method, the event loop will issue a warning whenever a new asynchronous generator is iterated for the first time. The idea is that after requesting all asynchronous generators to be shutdown, the program should not execute code that iterates over new asynchronous generators. An example of how ``shutdown_asyncgens`` should be used:: try: loop.run_forever() # or loop.run_until_complete(...) finally: loop.shutdown_asyncgens() loop.close() - Yury