I understand all the facts brought up by xairbusdriver, but it still doesn't answer my two questions. Indeed, the sunset of 2.7 is more critical on the FreeBSD servers I administer, especially because mailman2 depends on it, but my guess is that Apple will have to include a version of python and it will be a version 3 implementation. So let me ask my first question differently: has anyone installed version 3.1.3 successfully on OS version 12.2.1?
This brings up an interesting quandary. Suppose WeatherCat can't be installed on OS 12.2.1. If one installs OS 12.3, and even if python 3 is included as 'python', won't the existing WeatherCat fail to run, and then an 'update' to an existing app be impossible, requiring a full install?
However all this works out, I do think the issues need be clarified.
Thanks, Rick