I'm trying to convince myself Jupyter isn't a form of living in the REPL expressed through tabbed state in a linear order, of python execution. I think it is, but I suspect it fails some boundary condition of significance. That said, when I did it, I didn't find it too hard to introspect on my code, in what it told me.

I do think there is a meta going on around LISP repl and it's internal introspection which other REPL don't quite provide. You can come to almost the same place in output, but not at interaction with the run state of the 'machine' itself. (somebody else in the thread made the point its mostly there except handling exceptions in the stack)