I use Python for that, since I know it will always be on my machine.

Is this what you have in mind?

Yeah but i have Python PTSD from all this Python 2 vs. 3 shit :D

Perl still loves you and will always be there.

And I for one am here for Perl

I'm sure that there are still Python 2 codebases there running an unsupported interpreter, but for most people that has been at least 5-10 years ago. Also, the Python project learned a lot from the messy transition, that I think it's unlikely to happen again.

And then some old debian box comes out of shadow.

I'm sure that ubuntu LTS also extended the life of this disaster + some tool you wanted to use which never upgraded.

GNU Radio took ages

That was almost 20 years ago! We migrated 2 to 3 10 years ago. I'd say I moved on. I doubt there will ever be py4 :)