Johnson M.J. A Concise Introduction to Programming in Python

CRC Press, 2012. — 208 p. — ISBN: 143989695X, 9781439896952This text provides an introduction to writing software in Python. No previous programming experience is necessary. Most chapters begin with an example program illustrating a small set of new concepts.
However, you might consider typing each program in by hand rather than using the downloaded files. The reason is that you can learn by typing, both in terms of thoroughly reading the programs, and responding to error messages that result from typos. Rather than being a hindrance, learning to deal with error messages will be quite helpful as you write your own programs.