I'm sure it was printing out some warnings in that 6 years when I was not using it. It wasn't my script. It's somewhere on the internet in a random github repo, created by a random internet guy many years ago. All I remember that I wanted to use it again a few months ago, and it took like an hour of datamining by the time I figured out why it doesn't work anymore. Something got removed between Python 3.2 and 3.9, that was essential for this script.

Of course this is not the only example. It bites me at least once a month: I try to use some random python project from the internet only to find out that I'm using too new python. If I really badly need it, then it is time to set up a VM with an ancient python version. But usually I just give up, and look for a non-python solution. If it has never ever happened to anyone, then I guess I might be the only person using python in this world regularly.

But this is pretty much my point. Python3 scripts die if you try to use them with Python3 - today's python3 doesn't give a damn about yesterday's python3. Python3 scripts rot faster than milk on the sun.