Data Structures and Algorithms with Object-Oriented Design Patterns in Python - This book illustrates object-oriented design and it promotes the use of common, object-oriented design patterns. The algorithms and data structures in the book are presented in the Python programming language.

http://www.brpreiss.com/books/opus7/

Text Processing in Python - According to the author's website he is making an online copy of his book available to the python community with his publisher's permission. The files for the book are in text (.txt) format.

http://gnosis.cx/TPiP/

Practical Python Sample Chapter - One sample chapter and the source code for the book can be downloaded.

http://hetland.org/writing/practical-python/

Programming Python Sample Chapter - One chapter on Advanced Internet Topics from a Python book.

http://oreilly.com/catalog/python2/chapter/ch15.html