I know its very basis but i like how he teach this stuf and its free
Python Programming Tutorial - 1 - Installing Python - YouTube
You may want to examine code samples posted by Esri ie
ArcPy Café | Get all your ArcGIS Python Recipes here!
I know you requested an interactive tutorial but I would highly recommend the book Python - Scripting for ArcGIS which is published by ESRI. It starts with the basics and then leads into using Python and ArcPy so very desktop focused. I find I regularly check this book, especially when I need to fiddle around with geometries as I can never remember the syntax!
for some reason clicking on that link only goes to the Support Centre's home page.
I had to copy / paste this "http://blogs.esri.com/esri/supportcenter/2014/03/26/8-easy-ways-learning-python-arcpy/" into the browser for it to get to the correct site.
The following blog may be a good start:
Seven easy ways to start learning Python and ArcPy
Seven easy ways to start learning Python and ArcPy | Support Services Blog
This offers several different options for you to learn Python so if you learn better one way or another, those options are available to you.
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