PagedQuery is a paging abstraction that is applied to appengine Query or GQLQuery objects.

Static website generator inspired by Jekyll , written in python

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Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface.

Natural Language Processing with Python
--- Analyzing Text with the Natural Language Toolkit

Steven Bird, Ewan Klein, and Edward Loper

Installs python packages

Dumbo is a project that allows you to easily write and run Hadoop programs in Python (it’s named after Disney’s flying circus elephant, since the logo of Hadoop is an elephant and Python was named after the BBC series “Monty Python’s Flying Circus”). More generally, Dumbo can be considered to be a convenient Python API for writing MapReduce programs.

Twisted is an event-driven networking engine written in Python and licensed under the MIT license.

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A Python module to access Pinboard.in via its API.

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PyBrain is a modular Machine Learning Library for Python. Its goal is to offer flexible, easy-to-use yet still powerful algorithms for Machine Learning Tasks and a variety of predefined environments to test and compare your algorithms.
...contains algorithms for neural networks, for reinforcement learning (and the combination of the two), for unsupervised learning, and evolution. Since most of the current problems deal with continuous state and action spaces, function approximators (like neural networks) must be used to cope with the large dimensionality. Our library is built around neural networks in the kernel and all of the training methods accept a neural network as the to-be-trained instance. This makes PyBrain a powerful tool for real-life tasks.

"A python library for the Twitter API. OAuth, python 3, complete coverage, streaming API"

youtube-dl is a small command-line program to download videos from YouTube.com and a few more sites. It requires the Python interpreter, version 2.x (x being at least 4), and it's not platform specific.

A format-agnostic tabular dataset library for Python

"A collection of Python utilities for Mac OS X system administration.

The PyMacAdmin project started as a collaboration between Chris Adams and Nigel Kersten to develop a replacement for the unsupported 'kicker' feature included in OS X prior to 10.5. That replacement eventually became crankd, which provides a way to execute Python code or a shell script in response to many system events: network changes, filesystem activity, application launching, etc.

We've also added utilities to create network locations, manage proxy settings or update AirPort passwords using our Keychain wrapper."

webkit2png is a command line tool that creates png screenshots of webpages

django-powered pastebin

The Swinger: Python script turns any song into swing version via @BoingBoing

ScraperWiki code libraries make scraping, parsing and geocoding simple

png screenshots of webpages

I'm pleased to announce the release of bulkupdate, an unoriginally-named library for the App Engine Python runtime that facilitates doing bulk operations on datastore data. With bulkupdate, simple operations like bulk re-puts and bulk deletes are trivial, while more complex operations like schema transitions or even emailing all your users become much simpler.

an alternative implementation of the Python interpreter

Tornado is an open source version of the scalable, non-blocking web server and tools that power FriendFeed. The FriendFeed application is written using a web framework that looks a bit like web.py or Google's webapp, but with additional tools and optimizations to take advantage of the underlying non-blocking infrastructure.

The framework is distinct from most mainstream web server frameworks (and certainly most Python frameworks) because it is non-blocking and reasonably fast. Because it is non-blocking and uses epoll, it can handle thousands of simultaneous standing connections, which means it is ideal for real-time web services. We built the web server specifically to handle FriendFeed's real-time features — every active user of FriendFeed maintains an open connection to the FriendFeed servers. (For more information on scaling servers to support thousands of clients, see The C10K problem.)

See the Tornado documentation for a detailed walkthrough of the framework.

"...I wrote a little fun script that does almost the same: Just register it as a hg hook and it takes a picture of you exactly at the unique moment when merging fails and it sends it directly and without any further questions to Twitpic and Twitter"

Genshi is a Python library that provides an integrated set of components for parsing, generating, and processing HTML, XML or other textual content for output generation on the web.

mimesniff, an implementation of the HTML5 content sniffing algorithm: http://code.google.com/p/mimesniff/

http://diveintopython3.org/ now downloadable in HTML and PDF. The print edition will hit bookstores on October 16th.

script to back up tweets

libcloud is a standard client library for many popular cloud providers, written in python

django, ec2

A Python script to grab all your photos from flickr and dump them into a directory, organized into folders by set name.

Ruby port of the Python code from the book "Programming Collective Intelligence: Building Smart Web 2.0 Applications" by Toby Segaran

Whoosh is a fast, featureful full-text indexing and searching library implemented in pure Python.

Google's Python engineers have launched a new project called Unladen Swallow that seeks to improve the performance of the Python programming language. One of the project's goals is to replace the Python virtual machine with an LLVM-based JIT.

CherryPy is a pythonic, object-oriented HTTP framework.