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repoze.bfg is now Pyramid

The web framework previously known as repoze.bfg is now named Pyramid, managed as part of the Pylons Project.


The repoze.bfg web framework has now become "Pyramid", managed under the Pylons Project. See

For more detail, please read . If you're too busy for my personal blather, the FAQ should tell you everything you need to know. Otherwise, please read on.

Personal Perspective

Over the last few months, I've been collaborating pretty meaningfully with Ben Bangert, the lead developer of the Pylons ( web framework. This collaboration started because Ben and I have "competing" web frameworks, both written in Python. Our repoze.bfg and Ben's Pylons share almost exactly the same scope. They are both "lightweight" web frameworks. They use similar models for mapping URLs to code. They appeal to roughly the same sort of people.

In the meantime, it's clear that there is a limited amount of oxygen in the Python web framework world: only the frameworks which are clear winners will prosper and survive long-term. A potential Python web developer just doesn't have the time to evaluate 20 separate web frameworks. Even if he or she did, to a truly impartial evaluator, it would be extremely difficult to make a choice between two frameworks as similar as Pylons and repoze.bfg.

Ben and I, as well as other folks including Paul Everitt, Mark Ramm, and Chris Rossi met in Las Vegas a few weeks ago to talk about merging Pylons and repoze.bfg. To everyone's surprise, consensus was pretty easy: not only should it be done, it should be done swiftly. We agreed to collapse the crowded Python web framework world a bit in order for there to be slightly more oxygen for the Python web world to breathe.

Thus, BFG has now become Pyramid (, and is now part of the Pylons Project. "The Pylons Project" is the project name for a collection of related technologies. Pyramid is the first "new" package which is part of the Pylons Project. Other packages to the collection will be added over time, likely including higher-level components such as applications and other frameworks which rely on a particular persistence mechanism (Pyramid does not). The first release of Pyramid 1.0a1 was made Nov. 5 to PyPI. See for install instructions.

Personally, I couldn't be happier about this. I'm proud of the work we've done so far, and I'm extremely optimistic about the future of Pyramid and the Pylons Project.

repoze.bfg 1.3 (release made November 1) will be its last major release. Minor updates will be made for critical bug fixes (and so there may be a 1.3.1, 1.3.2, etc), but new feature development will take place in Pyramid. repoze.bfg won't see a 1.4 release (at least one made by me). While Pyramid is technically backwards incompatible with repoze.bfg, you won't have to do much to use your existing repoze.bfg applications on Pyramid. There's automation which will change most of your import statements and ZCML declarations. See

The Repoze project will continue to exist. Plenty of Repoze software exists that has nothing to do with repoze.bfg. The Pylons 1.0 web framework, Ben tells me, will be shifted into maintenance-only status once Pyramid has a non-alpha release. This isn't as desperate as it sounds: Pylons 1.X has effectively been in maintenance-only status for a good long while now; this just continues the trend. You should be able to create new Pylons 1.X applications without fearing that it will be abandoned immediately.

Existing BFG developers might consider joining the #pylons IRC channel on and the Pylons-devel maillist at Discussion about the framework-previously-known-as-BFG is meant to take place in these locations.

The Pyramid code is now kept at Unfortunately, existing contributor agreements arranged with Agendaless for the Repoze repository don't carry over to the new version control location. We don't currently have the machinery in place to accept new contributor agreements that will allow folks to check in directly to the Pyramid trunk and other Pyramid-related code, so, for now at least, we'll be making use of the "distributedndess" of Git: if you want to contribute something, make a fork of the code on GitHub and send a pull request.


Hopefully these will help clear up any misunderstandings about Pyramid:

Created by chrism
Last modified 2010-11-09 04:34 AM

Bye Bye bfg

Chris, this is a really good move. I'm a bit sad about the loss of the bfg name, but take some consolation in the nonexistent black space pyramid.