I'm working on a live coding environment for python[0], based on emacs' SLIME mode for common lisp. It's quite new and I haven't written documentation yet, but all the main SLIME features not covered by LSP are working.

- All results printed in the repl are presentations that can be inspected, copied around and used again -- as the actual object, not just it's str or repr text like in most repls.

- On any uncaught exception you get an interactive backtrace buffer where you can jump to source, see arguments and local variables for each frame, and eval code or open a repl in the context of any stack frame. And the arguments and local variables aren't just text but presentations you can open in the object inspector, copy to the repl and use, etc.

- A thread viewer where you can view stats on all threads, get the backtrace of any thread, spawn a repl in the context of any of it's stack frames, etc.

- An async task viewer with somewhat more limited functionality as async tasks don't keep a full stack.

- A pretty documentation browser using mmontone's slime-doc-contribs.

- The ability to trace functions, where again their arguments and return values aren't just printed as text, but as presentations, that you can open in the inspector, copy to the repl, etc.

- I took some code from IPython's autoreload extension, so interactive development without restarting and losing state mostly works.

If you want to collaborate or just talk ideas that'd be fantastic, I don't have any experience with the Pharo/Smalltalk world.

https://codeberg.org/sczi/swanky-python/