Exception event loop is closed with aiohttp and asyncio in python 3.8

Question

I am using asyncio and aiohttp to make concurrent requests. I've recently upgraded Python to version 3.8.0 and I'm getting a RuntimeError: Event loop is closed after the program has run.

import asyncio
import aiohttp

async def do_call(name, session):
    async with session.get('https://www.google.be') as response:
        await response.text()
        return 'ok - {}'.format(name)

async def main():
    async with aiohttp.ClientSession() as session:
        tasks = [do_call(str(i), session) for i in range(0,4)]
        results = await asyncio.gather(*tasks)
        print(results)

asyncio.run(main())

I do get a valid result from asyncio.gather(), but when exiting the exception is raised. I'd like to change the code so it doesn't run into exceptions.

The traceback is as follows:

Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x000001E9A92079D0>
Traceback (most recent call last):
  File "C:\Users\Jonas\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 116, in __del__
    self.close()
  File "C:\Users\Jonas\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:\Users\Jonas\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 711, in call_soon
    self._check_closed()
  File "C:\Users\Jonas\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 504, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed`

Answer 1

I think this is most likely an aiohttp bug. Specifically, I found this issue on their github: https://github.com/aio-libs/aiohttp/issues/4324

I realise this doesn't necessarily help you, but maybe you can switch back and stop banging your head against a wall. Your code is fine!