Why wouldn't SoloLearn add a lesson to Python on learning the "turtle" library?

Answer 1

Currently we can't use gui on python playground, so it would be difficult to teach. If you want to use turtle on sololearn, you may use achieve it through web playground, see this example:
https://code.sololearn.com/WR89sZ3WSjtq/?ref=app

You find more example on sololearn playground (Code section)

If you want to suggest it as course, you can write to [e-mail] or use the in-app feedback function.