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The Mu editor is a great graphical application to begin with when you first start working with MicroPython. Its simple and intuitive design makes it easy to get productive fast and makes it fun to explore its different features. Beyond its REPL features, it also has the main part of the Screen, which can be used to edit and save Python scripts. It has code-editing features such as code completion and will show helpful popups with details on a function's accepted arguments and documentation on what the function does.