Python

What's the best way to teach my kid programming. I don't know how. He's interested. He's done well in school with Scratch. He's expressed interest in Python, owns a Thumby, but never gets too far on his own. Instead of a Winter sport, we're leaning towards a Python class, however there's none in person. How can i help my kid embrace his passion and learn this skill which will help him his whole life.

He's got Mu installed and has perused youtube tutorials, but they dont hold his interest. Any help is appreciated. Edit: He's 10.