Ebook: Python Pocket Reference: Python in Your Pocket (Pocket Reference (O'Reilly))

The 4th edition is a good reference for the language itself. The content for 2.6 and 3.x Python are in there. It is not however a reference for the libraries. Most libraries are only mentioned by name, and their functions are not enumerated in a useful way. For instance, the network libraries are mentioned, but there is no detail on their functionality.