January 29, 2009 - The Zope 3 development team announces the Zope 3.4.0
After 2 years of development, the Zope Foundation and the larger Zope
community is proud to announce the release of Zope 3.4.0.
The focus of the Zope 3.4 development effort has been the conversion from a
monolithic source tree, to a set of many small packages (eggs), that can be
used independently of each other. The core has been further stabilized through
numerous bug fixes, and many new add-on packages have been developed to
provide a richer development experience.
With this release also comes a renewed commitment to a short and reliable
release cycle of 6 months.
Packages and Eggs
Zope 3 is now fully converted to an egg-based system. While some work still
remains, it integrates very well with the rest of the Python community. The
conversion to egg-based packaging also enables other Python developers to only
have to use small bits and pieces of the complete Zope software system. The
conversion means that Zope 3 developers do not use the classic Zope 3 tar-ball
release anymore. However, for your convenience, Zope 3 developers will provide
the classic Zope 3 tar ball releases for at least the 3.4 series and probably
for 3.5 as well.
So how are Zope 3 applications built using only eggs?
The Known Good Set (KGS)
The known good set -- or in short KGS -- is a configuration of packages and
their versions that are known to work well together. The compatibility is
frequently verified by running over twelve thousand tests on a daily
basis _. The KGS is tested against Python 2.4 and 2.5 on the 32- and 64-bit
platforms. The list of controlled packages and their versions for Zope 3.4 can
be found at the Zope 3 KGS site _.
The KGS can be used in several ways _. The most common way is to "nail" the
versions by downloading the version configuration file _ and insert them as
follows in your buildout configuration::
versions = versions
zope.interface = 3.4.0
``zopeproject`` Project Builder
To start building a project using a common setup, a package called
`zopeproject` can be used to quickly setup the boilerplate for the
project. Ample documentation is provided at the `zopeproject` home page
_. `zopeproject` uses Paste or ZDaemon to create a working server. The
following commands get you started::
$ easy_install zopeproject
$ zopeproject HelloWorld
$ cd HelloWorld
$ bin/helloworld-ctl foreground
At this point, there is no demo package demonstrating a simple Zope 3
application setup. However, the ``z3c.formdemo`` package can be used as a
fairly minimal setup. To get started with it, enter the following::
$ svn co svn://svn.zope.org/repos/main/z3c.formdemo/tags/1.5.3 formdemo
$ cd formdemo
$ python bootstrap.py
$ ./bin/buildout -v
$ ./bin/demo fg
..  http://zope3.pov.lt/buildbot
..  http://download.zope.org/zope3.4/3.4.0/controlled-packages.cfg
..  http://download.zope.org/zope3.4/intro.html
..  http://download.zope.org/zope3.4/3.4.0/versions.cfg
..  http://pypi.python.org/pypi/zopeproject
- Zope 3.4 KGS:
- Zope 3.4 Controlled Packages:
- Zope 3.4 Versions:
- The classic Zope 3 source release can be downloaded from:
Installation instructions for both Windows and Un*x/Linux are now available in
the top level `README.txt` file of the distribution. The binary installer is
recommended for Windows.
Zope 3.4 requires Python 2.4 or 3.5 to run. You must also have zlib installed
on your system.
- Zope 3 Development Web Site:
- Zope 3 Developers Mailing List:
- Zope 3 Users Mailing List:
- Bug tracker at launchpad:
- IRC Channel:
#zope3-dev at irc.freenode.net
About Zope 3
Zope 3 is a web application server that continues to build on the heritage of
Zope. It was rewritten from scratch based on the latest software design
patterns and the experiences of Zope 2.
The component architecture is the very core of Zope 3 that allows developers
create flexible and powerful web applications.
Compatibility with Zope 2
Zope 3 is not upwards compatible with Zope 2. This means you cannot run Zope 2
applications in Zope 3.
We continue to work on the transition from Zope 2 to Zope 3 by making Zope 2
use more and more of the Zope 3 infrastructure. This means that new code
written in Zope 2 can benefit from Zope 3 technology. Also, with care, code
can be written that works in both Zope 3 and Zope 2. This allows a Zope 2
application to slowly evolve towards Zope 3. Unchanged Zope 2 applications
are never expected to work in Zope 3, however.
About the Zope Foundation
The Zope Foundation, based in Fredricksburg, Virginia, is a not-for-profit
organisation that provides support for the Zope community and the Zope
platform and its associated software. Its community includes the open source
community of contributers as well as the community of businesses and
organizations that use Zope.
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