"Not everything that can be counted counts, and not everything that counts can be counted."
-- Albert Einstein
by Jeffrey Elkner (with liberal borrowings from the work of Allen Downey,
and Peter Wentworth
An introductory computer programming text book 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