Foundations of Python Network Programming

This is not a basic reference like Python comes with. Rather, it's a hands-on guide. There are over 6600 lines of example code and the text strives to show you the big picture. For instance, there are several different ways of getting directory information from an FTP server, and some are not documented for use this way. The chapter on FTP explains them and provides example code to illustrate. There's also an Apress page with details and a weblog page for your comments.