Python's repl is pretty average IMO, iPython is a lot better, Jupyter is best in class. Perhaps some of the old Lisp or Smalltalk environments could rival that

Python's repl is pretty average IMO, iPython is a lot better, Jupyter is best in class. Perhaps some of the old Lisp or Smalltalk environments could rival that, but no other modern language except Julia and R, which also have Jupyter support, come even close when repl ergonomics is concerned.