I did a bit of contract work for a place with over a million lines of custom python 2.x scripts that ran inside of a python interpreter embedded in a proprietar

I did a bit of contract work for a place with over a million lines of custom python 2.x scripts that ran inside of a python interpreter embedded in a proprietary product which made it difficult to do things like write and execute unit tests for the code. I think they were still writing new python 2.x code in 2018. A lot of the scripts were supporting processes that had a finite lifespan during the initial stages when the company infrastructure was being built out, rather than ongoing operational processes that needed to be performed indefinitely, so hopefully they'll be able to set a lot of that codebase on fire instead of maintaining or porting it to python 3.