I see there is also a Python API but it seems much more complex to play with.
Also saw somewhre (https://youtu.be/m1ejxSi3l8s?t=418) Node.js might be used.
What are the alternatives?
In the online code editor it is not possible i.e. to edit two files at same time, which might be a limitation overcome by other approaches. I guess setting up Python environment will allow me to do that, may be to use Sublime Text as an editor?