Nathaniel Smith writes:
Well, I'm afraid to contact this closed and not-for-mortals list, not sure this very basic question should go there ;) perhaps you are already a member, feel free to forward.
core-mentorship is intended as a friendly place for folks who are starting to study CPython internals. I'm not sure where you got the impression that it's not-for-mortals but I suspect the people running it would like to know so they can fix it :-).
I imagine Oleg got that impression because he tried to access the archives, which are closed to non-members. I don't recall the rationale for that but there was one, I suspect that won't change. IMO, the listinfo https://mail.python.org/mailman/listinfo/core-mentorship makes it clear that developers new to Python core code (whether they are new or advanced developers in other code bases) are welcome.
If it's something else, we would *definitely* like to know.