An optimization branch of CPython, intended to be fully compatible and significantly faster.

See the ProjectPlan for details on what we're building. The FAQ provides quick answers to common questions we've been getting. Benchmark numbers for our 2009Q3 release can be found on the Release2009Q3 page. See GettingStarted for checkout and build instructions.

Release history:

• 2009Q1: 1 April 2009
• 2009Q2: 13 July 2009
• 2009Q3: 20 October 2009

Send any questions/comments/flames to unladen-swallow@googlegroups.com. We also hang out on irc.oftc.net in #unladenswallow.