Skip to content


Subversion checkout URL

You can clone with
Download ZIP

Python 3 Porting

mcdonc edited this page · 52 revisions

The Pyramid master branch runs on Python 3.2 (as of September 25, 2011). It does not require a "translation" (via 2to3 or 3to2) but instead uses a single codebase that run under 2 and 3.

Currently neither scaffolding ("paster create") or paster commands like "paster pshell" or "paster pview" work. Also, some scaffolding dependencies such as zope.sqlalchemy and the transaction package are not yet ported, or, if they are, haven't had a general release yet. So it's not really ready for general public usage yet. However, it can be used by the curious hacker under Python 3.2, like so:

from pyramid.view import view_config
from pyramid.config import Configurator
from pyramid.response import Response
from wsgiref.simple_server import make_server

def test_page(request):
    return Response('Hello World')

if __name__ == '__main__':
    config = Configurator()
    config.add_route('test_page', '/test')
    httpd = make_server('', 8000, config.make_wsgi_app())

You'll need to install the WebOb master by hand into your virtualenv for this to work properly ( ).

Below are more details.

Dependencies that still need replacing

PasteScript has not been ported, nor have its dependencies. We likely will need to replace PasteScript rather than port it, unless someone is brave enough to do it in the meantime. Here's a list of the resulting packages that don't work that we will need to replace.

The fact that these dependencies are missing makes it necessary to create a Pyramid app "by hand" (ala instead of using "paster create" to create a new project.

Unported Pyramid scaffolding dependencies (required by Pyramid scaffolds, not core)

Scaffolding dependencies that won't be ported

Already-ported Pyramid dependencies

  • Chameleon (already worked under Py2.5 and Py3.2)
  • Mako (already worked under Py2.4-Py3.2)
  • MarkupSafe (already worked under Py2.4-Py3.2)
  • translationstring (merged jayd3e's py3 branch to trunk, released as 0.4)
  • venusian (jbohman ported, released as 1.0a1)
  • zope.interface (ported as of 3.6.0+)
  • repoze.lru (jbohman ported, released as 0.4)
  • zope.deprecation (chrism ported, released as 3.5.0)
  • WebTest (ported by gawel, released as 1.3.1)
  • WebOb (Joe Dallago: GSOC 2011 project, Chris McDonough picked up porting work, docs and testing work still remains, but webob trunk at has 3.2 support, no release yet save for zipballs such as the one at
  • PasteDeploy (already ported by agronholm, available in 1.5.0)

Already-ported Pyramid scaffolding dependencies

Pyramid dependencies removed (and thus didn't need to be ported)

  • zope.component (jbohman factored out "zope.registry" and placed it in zope SVN; also see, this code was later moved to zope.interface in version 3.8.0, removed z.component dep in Pyramid 1.3)
  • zope.configuration (removed core dependency on this in Pyramid 1.2a5+; still dep'ed on by pyramid_zcml)
  • zope.i18nmessageid (transitive dep of zope.configuration; removed z.config dep in Pyramid 1.2a5+)
  • zope.schema (transitive dep of zope.configuration; removed z.config dep in Pyramid 1.2a5+)
  • zope.event (transitive dep of zope.component, removed zope.component dep in Pyramid 1.3)

Related Zope package info:

Something went wrong with that request. Please try again.