Extending and Embedding
Python Testing Tools Taxonomy
[http://python.org python.org] - Official Python language website!
[http://www.vex.net/parnassus/ Vaults of Parnassus] - Contains a large database of Python scripts, modules, and resources. (No longer active)
[http://aspn.activestate.com/ASPN/Python/Cookbook/ Python Cookbook] - ASPNetwork's collaborative collection of your contributions to Python lore.
[http://www.pythonware.com/daily/ Daily Python-URL] - Daily news from the Python universe, presented by your friends at PythonWare. (No longer active)
[http://planet.python.org/] Python news gathered from various sources.
[http://www-128.ibm.com/developerworks/views/linux/libraryview.jsp?search_by=charming+python: Charming Python] - IBM's developerWorks series Charming Python.
[http://www.doughellmann.com/PyMOTW/ Python Module of the Week] Doug Hellmann is a great source for documentation on Python modules. There are over 120 entries from abc to zlib. Check here before going to the python.org docs
[http://effbot.org/tkinterbook/ An Introduction to Tkinter] An excellent reference source for Tkinter.
[http://infohost.nmt.edu/tcc/help/pubs/tkinter/index.html Tkinter reference: a GUI for Python] Also an excellent reference for Tkinter material.
Membership Reviewed Books
Note: I posted links to a company who sells these books at a very low price, which also serves as a description of their contents, the group in no way supports, endorses, or is affiliated with [http://www.bookpool.com Bookpool] purchase at your own risk. You can also find these books at [http://opamp.com Opamp], a very interesting local technical bookstore, often more costly, although imho worth it to assure its existence as a future resource of technical goodness (same disclaimer applies as did to bookpool).
[http://www.bookpool.com/sm/0735710910 Python Essential Reference] - If you can't find Python In a Nutshell get this one (its a close second in quality and content). - Steve Petrovits
[http://www.bookpool.com/sm/0596001886 Python In a Nutshell] - Imho the best all around python book out, if you're going to buy only one Python book make it this one. - Steve Petrovits
[http://www.bookpool.com/sm/0596000855 Python Programming] - Interesting all around python programming book, features real world application based examples more then code snippets. - Steve Petrovits
[http://diveintopython.org/toc/index.html Dive Into Python] - Covers everything from your first program through unit testing and refactoring. There is also a version for Python 3.X [http://diveintopython3.org/]
[http://www.greenteapress.com/thinkpython/html/index.html Think Python: How to Think Like a Computer Scientist] Also covers the essentials with a section on Tkinter as well.