Python 2 to Python 3 in a Django codebase ... may be a full rewrite anyway.

Many people migrated Django projects from 2 -> 3. Certainly something that takes effort, but hardly a rewrite.

Its fine, I ported quite a few Django libraries to python 3 at the time just because I wanted to use them.

2to3 gets you pretty far and theres not much in the rest.

Nothing like a full rewrite. I migrated multiple projects, but while there is a significant amount of work involved its a tiny fraction of what a full rewrite would require.

Did it a couple of times. Not something you can do with your eyes closed, but not even close to the nightmare of upgrading a JS application or upgrading a rails app.