afaik the python 3 packages aren't an update of python 2 they're separate packages, thus you can have python 2 and python 3 installed simultaneously.
Then I think the default python instance is configured with the update-alternatives command.
Not near a Debian or RaspiOS machine at the moment so can't be sure.
Then I think the default python instance is configured with the update-alternatives command.
Not near a Debian or RaspiOS machine at the moment so can't be sure.