REPL means read-eval-print-loop, it is one of the features in the Python programming language. Where the written code will be executed on the fly. For MicroPython it is called MicroPython Interactive Interpreter Mode. This feature is really helpful for a newbie or beginner to learn coding in microcontroller.
This video shares about the advantages of REPL in MicroPython.
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You are encouraged to improve the code for better application.“