Error messages have sometimes improved a bit
It used to be "FILE NOT FOUND" (or for the really old: 2). Unless told to do otherwise Python3 actually tells you which file was not found. Perhaps in a few more decades software will also tell you where the file was not found so you can put it in the right place. (Or possibly RTFantasticM until you find how to tell the software to look in the directory where the file actually is.)
Biting the hand that feeds IT
