[Python-modules-team] Bug#936745: ipywidgets: Python2 removal in sid/bullseye

[peter green]

severity 936745 serious
thanks

python-widgetsnbextension depends on python-notebook, which is no longer built by the jupyter-notebook source package. python-ipywidgets in turn depends on python-widgetsnbextension.

Unfortunately matplotlib2 build-depends (but does not depend) on python-ipywidgets, i'm not sure if it's feasible to break that link somehow (possiblly by reducing test coverage).