The code is not garbage, it's just your highfalutin python opinion makes it so you only ever use list comprehensions or return generators.

For loops in python that return non lazy evaluated lists are fine. Python was never suppose to be an efficient language anyways, grading python based off of this criteria is pointless.

It doesn't matter how snobbish you are on language syntax though. I fed it code and regardless of whether you think it's garbage it did what I asked it to do and nothing else.

Would you prefer the AI say, "this code is garbage, here's not only how to make it unit testable but how to improve your garbage code." Actually we can make the output more unpredictable as LLMs do have a non deterministic seed that can increase the creativity of the answer.