asyncio.run() cannot be called from a running event loop

Question

I have looked at previous answers and none of them seem to solve my issue. I am running the below code

from pyracing.client import Client
import asyncio

username = 'My Email Address'
password = 'My Password'

# Authentication is automated and will be initiated on first request
ir = Client(username, password)

# Example async function with hardcoded results
async def main():

seasons_list = await ir.current_seasons()

for season in seasons_list:
    if season.season_id == 2846:
        print(f'Schedule for {season.series_name_short}' 
                f' ({season.season_year} S{season.season_quarter})')

        for t in season.tracks:
            print(f'\tWeek {t.race_week} will take place at {t.name} ({t.config})')

asyncio.run(main())

and I get the below error:

RuntimeError                              Traceback (most recent call last)
Cell In[1], line 23
 20             for t in season.tracks:
 21                 print(f'\tWeek {t.race_week} will take place at {t.name}     ({t.config})')
---> 23 asyncio.run(main())

File ~\AppData\Local\anaconda3\Lib\asyncio\runners.py:191, in run(main, debug,     loop_factory)
161 """Execute the coroutine and return the result.
162 
163 This function runs the passed coroutine, taking care of
(...)
187     asyncio.run(main())
188 """
189 if events._get_running_loop() is not None:
190     # fail fast with short traceback
--> 191     raise RuntimeError(
192         "asyncio.run() cannot be called from a running event loop")
194 with Runner(debug=debug, loop_factory=loop_factory) as runner:
195     return runner.run(main)

RuntimeError: asyncio.run() cannot be called from a running event loop

what is am trying to eliminate is teh runtime error issue

Can't reproduce. Is this on something like Jupyter and you have a running loop in the kernel already? — Klaus D.
– Klaus D., Commented Aug 14 at 10:24
you have wrong indentation. All code is outside main(). Always put correctly formatted code. — furas
– furas, Commented Aug 14 at 11:54

Wayne · Accepted Answer · 2025-09-04 02:03:14Z

0

From your logs I assume you're running this in Jupyter Cell In[1].

So yeah in that case this error message explains itself:
RuntimeError: asyncio.run() cannot be called from a running event loop

This is due to Jupyter already having an event loop running, so calling asyncio.run() fails because it tries to start a new loop.

Here is what you can do :

First before all, please fix your identation.
Switch to plain python script so you can use asyncio.run()
Stay in Jupyter and simply use
await main() instead of asyncio.run(main())

edited Sep 4 at 2:03

Wayne

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answered Sep 3 at 20:40

Mag_Amine

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