Sorry if this is a such an obvious question, but where does Ubuntu put documentation packages for python, node.js, redis, mysql, mongodb, and other applications?
And why I cannot access it by typing
python-doc in the terminal?
To examine help for all installed modules
is how you do it in the python shell. One of those generates the output that shows you where to point a web browser for the docs.
Might be what you were looking for. I'm assuming the answer wasn't sufficient yet.
If you want a gui, you might enjoy the package devhelp.
Since you have already installed python-doc, you can run
So, in general, doc packages go in