Python / Cython resources
General
Python - docs, FAQs, wiki, language, library, modules, packages, quickref, python-dev, repo, tracker.
Tutorials, books, etc.
Dive into Python by M. Pilgrim.
How to Think Like a Computer Scientist: Learning with Python by J. Elkener, A. B. Downey, and C. Meyers.
Python for Software Design by A. B. Downey.
Articles, HOWTOs, etc.
decorator by M. Simionato.
Functional Programming HOWTO by A. M. Kuchling.
Regular Expression HOWTO by A. M. Kuchling.
Packages included with Sage
matplotlib - 2D plotting - docs, examples, gallery.
Mercurial (hg) - Source control manager - book, extensions.
MoinMoin - Wiki engine - extensions.
Pexpect - Spawn and control processes.
SQLAlchemy - Database toolkit - docs.
ZODB - Object database.
Other packages
Google App Engine - Web framework - docs.
Pyjamas - Web and desktop framework.