Source code online books for professionals by professionals

GettING What YOU NeeD
In some operating systems, such as Mac oS X and several flavors of Linux, python should already be installed. If it 
is not, most Linux distributions will let you install the software you need through some form of package manager. 
If you want or need to install python manually, you can find all you need on the python web site, 
http://python.org
.
What’s in This Book
The book is structured as follows:
Chapter 1: Introduction. You’ve already gotten through most of this. It gives an overview of the book.
Chapter 2: The Basics. This covers the basic concepts and terminology, as well as some fundamental math. Among 
other things, you learn how to be sloppier with your formulas than ever before, and still get the right results, using 
asymptotic notation.
Chapter 3: Counting 101. More math—but it’s really fun math, I promise! There’s some basic combinatorics for 
analyzing the running time of algorithms, as well as a gentle introduction to recursion and recurrence relations.