Failed to start the kernel (xeus-python 0.15.9)

[benbovy]

Description

Not sure this is the right place to report it, but the very recent deployments of jupyterlite + xeus-python-kernel (last version: 0.15.9) on RTD did not work for me. Jupyterlite is built and deployed without error but the xeus python kernel fails to start when visiting the web page (see browser output below).

Reproduce

Links to a deployment that is not working (using xeus-python 0.15.9):

• build logs: https://readthedocs.org/projects/ipytone/builds/20334811/
• web page: https://ipytone--112.org.readthedocs.build/en/112/demo.html

Links to a deployment that is working (pinning xeus-python <=0.15.7):

• PR: https://github.com/benbovy/ipytone/pull/114
• build logs: https://readthedocs.org/projects/ipytone/builds/20355311/
• web page: https://ipytone--114.org.readthedocs.build/en/114/demo.html

Expected behavior

No error when the xeus kernel is initialized.

Context

• JupyterLite version: 0.1.0
• Operating System and version: MacOS
• Browser and version: Firefox 112.0.2 and Chrome 112.0.5615.137

Browser Output

The relevant console logs:



The error is raised here:

[martinRenou]

Thanks! I am releasing jupyterlite-xeus-python right now with https://github.com/jupyterlite/xeus-python-kernel/pull/129 which should fix the immediate issue.

The underlying issue is that the latest xeus-python version needs empack v3, which jupyterlite-xeus-python does not use. We'll update soon jupyterlite-xeus-python to empack v3, but from now on jupyterlite-xeus-python would always pull a version of xeus-python that works for sure.

[benbovy]

Excellent thanks!