Arduino R4 Micropython?

[johnsondavies]

You might also be interested in uLisp, a Lisp interpreter for the Uno R4 boards:

Lisp interpreter for the Arduino Uno R4 boards

My compact Lisp interpreter for microcontrollers, uLisp, now provides full support for the Uno R4 Minima and Uno R4 WiFi. You can enter Lisp programs via the Arduino IDE Serial Monitor, or a terminal, and control most of the boards' hardware features interactively with Lisp commands. For more details see Arduino Uno R4 Boards.