asyncio.run() fails in the notebook

[pylang]

Problem

I cannot run in the notebook a demo from the asyncio docs:

Observation

It does seem to run in ipython:

Setup

I've installed a new everything on a fresh install of Windows 10.
I am running Python 3.7 via Anaconda 2018.12.

conda                     4.5.12                   py37_0
ipykernel                 5.1.0            py37h39e3cac_0
ipython                   7.2.0            py37h39e3cac_0
jupyter                   1.0.0                    py37_7
jupyter_client            5.2.4                    py37_0
notebook                  5.7.4                    py37_0

[takluyver]

cc @Carreau

[Carreau]

Yes, it is a known limitation.
You need to use things like nest-async-io. This is documented here.

You should be able to just await main()

[Carreau]

I'm going to close as I'm not sure there is much we can do as nesting event loop is a bad idea.
Feel free to keep commenting or ask for a re-open.