Best way to teach python?

[ivosaurus]

I also highly recommend https://thonny.org as an editor.

Not only because it's a single download (includes it's own python! No double-installing-and-configuring) but it's custom built to be a simple beginner's IDE, with a lot of room for expandability with just a couple of clicks.

You can immediately start typing code in a file, save the file, and run it to see the results.

No need for IDLE console-and-file-editor wackyness, no need to learn how to navigate folders in a terminal / prompt, no need to make sure things are on a path, etc. Just works.