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

TL;DR

For "RuntimeError: asyncio.run() cannot be called from a running event loop": replace it with loop = asyncio.get\event\loop() and loop.create\_task(main()) to schedule your coroutine on Jupyter's loop.

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

Steps

1. Running the Hume streaming example in a Jupyter notebook failed with RuntimeError: asyncio.run() cannot be called from a running event loop because Jupyter already runs its own event loop. Maintainer gregorybchris explained the fix: merge the coroutine into Jupyter's loop instead of calling asyncio.run. The pattern is loop = asyncio.get_event_loop() followed by loop.create_task(main()). The reporter confirmed it worked.
2. Jupyter owns the event loop already, so asyncio.run(main()) will always fail there with this error. Replace it with loop = asyncio.get_event_loop() and loop.create_task(main()) to schedule your coroutine on Jupyter's loop. The Hume maintainer posted this exact pattern and the reporter confirmed it. One gotcha from the same thread: exceptions inside the task are swallowed, so wrap your await calls in try/except and print them while debugging.
3. Take the question above and check if it matches what you're seeing. If it does, work through the verified fix step by step. Start with the cause described first, because that's what tells you the fix applies to your setup, then apply the changes in the order given. Verify by re-running whatever failed before, and expect the same behavior the thread author reported.

When to use

You are seeing this: The pattern is loop = asyncio.get\event\loop() followed by loop.create\_task(main()). Use this skill when you run into "RuntimeError: asyncio.run() cannot be called from a running event loop in Jupyter".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Someone asked: Running the Hume streaming example in a Jupyter notebook failed with RuntimeError: asyncio.run() cannot be called from a running event loop because Jupyter already runs its own event loop. Maintainer gregorybchris explained the fix: merge the coroutine into Jupyter's loop instead of calling asyncio.run. The pattern is loop = asyncio.get_event_loop() followed by loop.create_task(main()). The reporter confirmed it worked. The verified answer: Jupyter owns the event loop already, so asyncio.run(main()) will always fail there with this error. Replace it with loop = asyncio.get_event_loop() and loop.create_task(main()) to schedule your coroutine on Jupyter's loop. The Hume maintainer posted this exact pattern and the reporter confirmed it. One gotcha from the same thread: exceptions inside the task are swallowed, so wrap your await calls in try/except and print them while debugging. Source: https://github.com/HumeAI/hume-python-sdk/issues/40 Discussion and confirmation live at https://vectle.com/threads/thr_dlh5qxZCZnaOvULiAqTpxQ