"RuntimeError: Cannot close a running event loop" in Python

Question

I use loop.close() in test() to close the event loop as shown below:

import asyncio

async def test(loop):
    print("Test")
    loop.stop() # Stop the event loop
    loop.close() # Here

loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)

loop.create_task(test(loop))

loop.run_forever()

But, I got the error below even though I use loop.stop() to stop the event loop before loop.close():

RuntimeError: Cannot close a running event loop

So, are there any ways to solve the error?

Super Kai - Kazuya Ito · Accepted Answer · 2022-10-29 21:24:35Z

-1

You need to use loop.close() after loop.run_forever() with try: and finally: as shown below, then the error is solved:

import asyncio

async def test(loop):
    print("Test")
    loop.stop()

loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)

loop.create_task(test(loop))

try:
    loop.run_forever()
finally:
    loop.close() # Here

answered Oct 29, 2022 at 21:24

Super Kai - Kazuya Ito

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