exactly. But I'm already in iTerm using vim, so I use the iTerm repl instead. Not saying jupyter wouldn't do a great job, just that seems more convenient to use what's in my environment instead :)
The nice thing about Jupyter notebooks is that rather than having a command history which can be unwieldy when tweaking functions, you have cells that are easy to go back and edit. Additionally, when you're done with your experiments you can tidy things up, stuff a few markdown comments in there and you have a nice tutorial for other developers.