Python for Data Science by Joe McCarthy.
From the post:
This short primer on Python is designed to provide a rapid “on-ramp” to enable computer programmers who are already familiar with concepts and constructs in other programming languages learn enough about Python to facilitate the effective use of open-source and proprietary Python-based machine learning and data science tools.
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Uses an IPython Notebook for delivery.
This is a tutorial you will want to pass on to others! Or emulate if you want to cover another language or subject.
I first saw this in a tweet by Tom Brander.