FYI: python-cogent requires numba, numba (which is a just-in-time compiler for Python) got removed from testing for not supporting Python 3.9 yet.They finally backported a patch for numba, but the numba armhf tests are failing https://qa.debian.org/excuses.php?package=numba They tried to work around that with the last upload https://tracker.debian.org/news/1222710/accepted-numba-0520-2-source-into-unstable/ but that didn't work yet.Python-cogent also depends on jupyter-sphinx and that package is also in a tough place: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950598