I'm not clear what your point is. Much of the python3 code I use today was written 10 years ago (or more) and only barely had to be touched to work on 3. > oth

I'm not clear what your point is. Much of the python3 code I use today was written 10 years ago (or more) and only barely had to be touched to work on 3. > other long running processes where "new" machines are 15 years old Then...pin to a 15 year old version and use that. No one is forcing you to upgrade.