Because it's a fun exercise to understand the internals of CPython. That's what hacking is all about.

Because goto can be useful?

You are not a Python programmer for sure :)

In e.g. fortran there are labelled loops. So one can break out of an inner loop back to the main program flow. I know that this wouldn't be pythonic but sometimes I just want to finish the one off script and get back to something more fun and I miss this ability. I still don't think arbitrary gotos are great.

You can resolve this in basically every language by reworking your code in smaller pieces, and simply returning from a loop. Jumping left and right should only be signalling that you are Doing It Wrong (tm)

See the reply by Intermernet elsewhere in this discussion: https://news.ycombinator.com/item?id=10251397

Can you do that without causing performance degradation e.g. through cache thrashing though? Fortran performance can vary significantly when you move stuff around.

I know this. As a said I would use this for one off scripts if it existed. (I'm not about to add a dependency to all my one off scripts though.)

I've seen exceptions masquerading as goto in the wild in multiple python codebases (and not because I added them). `raise HttpResponse(status=401, body="unauthorized")` inside some utility method is little more than goto exit in a lot of C code.

Using Exceptions this way in Python code is common practice and considered "Pythonic" and it's different than goto:

- an Exception only can bubble up the call stack, not to an arbitrary location in the code

- it can be caught whatever level during that path