So, I think this is the intended situation now, actually? Based on the email chain on the mailing list, it sounds like they're getting rid of the python command and package.
https://lists.debian.org/debian-python/2020/09/msg00030.html https://lists.debian.org/debian-python/2020/07/msg00039.html If that's true - users need a better way to find out about this, other than reading through the mailing list. There should be big bold letters on the Debian python wiki, or FAQ, or on the roadmap, or all three. This move breaks a lot of folks' stuff. Lots of people are going to be confused by this after they run dist-upgrade. It also seems very unusual that there's still a python package in unstable. Changes in testing are usually preceded by 10 days of changes in unstable.