p5js

Hi 👋👋👋

We are using this issue to focus on documentation! Documentation is essential for new learners and experienced programmers alike. It helps make our community inclusive by extending a friendly hand to those that are less familiar with p5.js. It also helps us find the bugs and issues with the code itself, because we test and try things out as we document.

[There are several ways to con

Let's add an error message that will be thrown when people call addData without an output argument in the call. See context in #990!

The pyp5js command should also display the installed version when called without arguments. The same should happen with the pyp5js serve command.

Current output

$ pyp5js
Usage: pyp5js [OPTIONS] COMMAND [ARGS]...

  pyp5js is a command line tool to conver Python 3 code to p5.js.

  Every sketch will be stored in ~/sketchbook-pyp5js/. You can customize
  this by defining an 

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4. Attach a Screenshot in the Screenshot folder.
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