I tried to run a Ruby script recently and got an error about Fixnum. Apparently they made some breaking change to how integer types are referenced in version 3. I had to modify the script to get it to work on a modern parser. How is this not equivalent to the Python 2-3 jump? I don't know the first thing about Ruby but this already told me that it's a language with breaking changes between versions.

(It was the ruby scripts here if anyone is curious: https://github.com/haberman/vtparse/ )

And the best part.. it was Python 2.7. Micro Center sold me a brand new, glossy covered "Learn Python" book based on 2.7 in the year Anno Domini 2025. Its instructions didn't even properly tell you to install that version, so if you even make it that far you're going to be lost why the syntax is wrong for every example.

Moral is, books are just as easy to strike out on as a bad online resource. Honestly, I feel like Googling "x language tutorial" is probably going to get you the best results much more easily than picking something off the book shelf - if I can't vet a book reliably, and I already know the damn language inside and out, what hope does a newcomer have?

There is a good ending at least. Among a bunch of random stuff I got from an infrared spectroscopy shop that was closing down and practically giving away all their cool equipment, I found a copy of K&R C. I'd never read it myself but I'd heard so much about it online over the years that I figured it was as worth a try. So I got the victim of the Python book set up with WSL and gcc, and they had a much better time that time around.

Sure, but couldn't you say the same for letting other people contribute code too? In either case, you make the choice of how deeply you want to review it. You can ask the AI or the human to explain things that aren't clear.

For me it's case by case in either scenario. Sometimes it's not that important to look closely at a specific subsystem that's self-contained or just simple, other times I need to carefully audit whatever touches a different system. You need a good sense of the existing codebase/architecture in the first place to make these determinations.