It's already been since 2015. Every major Python dependency has been Python3 compatible for several years, and many have already gone Python3 only. If you have

It's already been since 2015. Every major Python dependency has been Python3 compatible for several years, and many have already gone Python3 only. If you have a good test suite it's pretty easy to migrate, you can easily do a couple thousand lines per day. There were a few third-party testing tools that used to be fairly popular that are no longer well maintained, so if your tests are written in those then you might be looking at re-writing the app from scratch. But otherwise it's fairly straightforward to port. Even if you did your string encoding just using guess-and-check, which most people did, it still doesn't take all that long to upgrade as long as there are tests.