A read–eval–print loop (REPL), also termed an interactive toplevel or language shell, is a simple, interactive programming environment that takes single user inputs (i.e., single expressions), evaluates them, and returns the result to the user; a program written in a REPL environment is executed piecewise.
The prior REPL in CircuitScheme was just a way to enter code via the console. It simply reads characters and tried to evaluate what you entered when you ended the line.
This guide walks through a more feature complete REPL for CircuitScheme. Even though it was written for CircuitScheme, it’s completely independent except for 2 function calls. This means that it’s quite general and can easily be adapted to most situations where you need to enter keyboard commands to a CircuitPython app.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell with Google Hangouts On-Air is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
