unblock 936745 by 936995 severity 936745 serious thanks
matplotlib2 no longer has any dependencies or build-dependencies on packages built from the ipywidgets source. According to https://ftp-master.debian.org/users/dktrkranz/NBS ipywidgets has dependencies or build-depdencies on several packages that are no longer built by their corresponding source packages. ipywidgets build-depends on python-coverage. python-widgetsnbextension depends on python-notebook It seems like it is time to drop python2 support from this package.
