Kernel does not give any output on Windows, asyncio NotImplementedError, Kernel died

[stefaneidelloth]

I tried to install akernel with JupyterLab 3.1.18 and Python 3.9.4 on Windows 10

pip install akernel[react]
akernel install react
jupyter lab build

Its possible to select akernel for a Notebook. However, the notebook does not produce any output for my cells:

[davidbrochart]

It looks like this happens when restarting the kernel?

[stefaneidelloth]

Already happens when opening the notebook. Might be a general issue with asyncio and Windows?

• https://stackoverflow.com/questions/58014623/python-asyncio-notimplementederror

• https://github.com/zeromq/pyzmq/issues/1423

=>Does akernel support Windows at all?

[davidbrochart]

=>Does akernel support Windows at all?

It has never been tested, and I don't have a Windows machine.

[stefaneidelloth]

I tried to upgrade pyzmq to version 22.3.0 and the error message changes to a warning:

And there is still no cell output.

[stefaneidelloth]

It has never been tested, and I don't have a Windows machine.

Thank you for the clarification.

[davidbrochart]

I tested v0.1.15 on a Windows machine with Python 3.9 and didn't see any issue. Could you try with this version? Also, I can see you are using winpython, I used a conda environment, but I'm not sure it could be related.

[stefaneidelloth]

Thank you. I updated some libraries. Following config worked for me

• Python 3.9.4
• akernel 0.0.15
• asyncio 3.4.3
• tornado 6.1
• zmq 0.0.0
• pyzmq 22.3.0

after I put following code at top of the notebook:

import asyncio
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

Or, as an alternative, uninstall the packages zmq and asyncio

• zmq seems to cause the issue (akernel uses pyzmq).
• installation of asyncio is not required for python 3.9 cause asyncio is included in stdlib.

[davidbrochart]

Great! BTW, what does asyncio 3.4.3 mean?