There is a quote mistakenly attributed to Mark Twain which say something like "I would have written a shorter letter, but I did not have the time". The quote is really from Pascal and it is butchered but that is beside the point.
This book on Python is quite simply the shortest and most concise work on the topic to date. It is like getting just enough of the cookbooks and reference books and boiling it down to just enough to fit in your back pocket. Authoring this puppy must have been painful but I do appreciate it.