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-- Corey Doctorow
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by Brad Miller and David Ranum, Luther College (as remixed by Jeffrey Elkner)
by Mark Guzdial and Barbara Ericson
Hands-on introductory computer programming using Python 3.
by Peter Wentworth, Jeffrey Elkner, Allen Downey, and Chris Meyers
An introductory computer science text book using Python.
by Tony R. Kuphaldt
A free series of textbooks on the subjects of electricity and electronics