Python Essential Reference 4th Edition by David BeazleyIn the first chapter, the author gives a brief overview of python's features and refers to the chapters in which he discusses these topics in detail.
The chapter on Functional programming is pretty awesome where the author covers Decorators, Generators and List Comprehensions.
Overall, I highly recommend this book to anyone who had little introduction to Python. As the author mentions in the preface, this book is not for someone who wants to learn Python.