Foundations of agile Python development by Jeff Younker.pdf

Agile, Revision Control, Test-Driven Development, Unit Testing, Stubs, Mock-Ups, Code Coverage, and more. This stuff requires a top-down approach -- understanding it on a high level before being able to use it to its fullest. Sure, you probably use CVS or Subversion and test your code. But this book gives you the full picture, and ties everything together.