March 2003 - Zope-Announce

PyCon DC: last day for on-line registration
by Guido van Rossum 21 Mar '03

21 Mar '03

This is the final reminder that today (Friday) is the last day to register online for PyCon DC. Still only $200! The conference starts next Wednesday (March 26): http://www.python.org/pycon/ After today, you'll have to pay $250 on-site (credit cards only). --Guido van Rossum (home page: http://www.python.org/~guido/)

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[Ann] "ReadCommitted" transaction isolation level
by Dieter Maurer 20 Mar '03

20 Mar '03

When you are plagued by "ReadConflictError"s, you might be interested in the "ReadCommitted" transaction isolation level. Usually, a transaction receives a "ReadConflictError" when it tries to load an object from ZODB that has been modified since transaction start. Usually, the application will abort the transaction in this case and restart it. When transactions are long or writes a frequent, "ReadConflictError"s can become a plague. That's when the "ReadCommitted" transaction isolation level can step in. Rather than raising a "ReadConflictError", it reads the state as it was when the transaction started, provided the storage supports "undo". If this is not the case, a "ReadConflictError" is raised. You find a patch (against Zope 2.6.1) that provides the "ReadCommitted" isolation level at <http://www.dieter.handshake.de/pyprojects/zope> Dieter

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PyCon: One more day for pre-reg!
by Aahz 20 Mar '03

20 Mar '03

Friday, March 21 is the deadline if you want to get the $200 pre-conference price. PyCon will cost $250 at the door, and there is no single-day rate. http://www.python.org/pycon/reg.html PyCon DC 2003 The first PyCon will be held 26-28 March, 2003, at George Washington University's Cafritz Conference Center in Washington DC. There will be a development sprint Mon/Tues before the conference. PyCon is a community-oriented conference targeting developers (both those using Python and those working on the Python project). It gives you opportunities to learn about significant advances in the Python development community, to participate in a programming sprint with some of the leading minds in the Open Source community, and to meet fellow developers from around the world. The organizers have worked hard to ensure that the conference be affordable and accessible to all. We look forward to seeing you there. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ Register for PyCon now! http://www.python.org/pycon/reg.html

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Call for Participation: EuroPython 2003
by europython＠python.org 19 Mar '03

19 Mar '03

The EuroPython Conference 2003 (EPC2003) returns to Belgium this June, and the conference organizers are now accepting proposals for presentations and tutorials. We expect this year to be even more successful, and we're not just talking about the Chimay. We are looking for participation in the following conference tracks: Python Frameworks, Python Language, Python in Business, Python in Science and Industry, and Zope. Track descriptions are available at <http://www.europython.org/sessions/descriptions>. The deadline for submissions is Monday, April 21. You can propose a 30 minute talk, a 45 minute talk, or a 2 hour tutorial. To propose a talk or tutorial, please visit the Talk Submission page at <http://www.europython.org/Talks/callFor>. For more information about the conference tracks, please contact the track chairpersons listed at <http://www.europython.org/sessions/descriptions>. For general questions about the conference, please visit the conference website at <http://www.europython.org/>. Also, if you would like to help us make this year's EuroPython conference another success, please volunteer! You can join us on the EuroPython mailing list at <http://mail.python.org/mailman/listinfo/europython>. About EuroPython Conference 2003: EuroPython Conference 2003 is the premiere venue for meeting Python and Zope developers from Europe and beyond. As one of the first community-organized Python and Zope conferences, the EuroPython Conference delivers the atmosphere and information developers want. The conference will be held June 25-27, 2003 in Charleroi, Belgium. Information is available at the EuroPython website at <http://www.europython.org/>. For more information, contact <info(a)europython.org>.

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A few more days to register for PyDon DC!
by Guido van Rossum 18 Mar '03

18 Mar '03

Coming Friday is the *last day* to register for PyCon DC online. After that, the rates go up to $250, and you'll have to pay on-site. http://www.python.org/pycon/ Speakers! This applies to you too. Already registered? BOOK YOUR HOTEL ROOM NOW! Late March is cherry blossom time in DC, and hotels fill up quickly. Ditto for flights. We've already got over 200 attendees registered. Don't miss it! --Guido van Rossum (home page: http://www.python.org/~guido/)

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ZODB4 alpha 1 release
by Jeremy Hylton 17 Mar '03

17 Mar '03

We've released ZODB4 alpha 1, the first official release of the ZODB code from the Zope3 project. You can get it at http://www.zope.org/Products/ZODB4. This release contains essentially the same software that will be in the upcoming Zope3 milestone release. This version of ZODB is very different from ZODB3. The Persistent base class is a new-style class, allowing persistent objects to use many of the features of Python 2.2 new-style classes. There are still many changes planned for future versions of ZODB4, but the current release is stable enough to call an alpha. The current test suite passes with Python 2.2.2 and Python 2.3 CVS on both Linux and Windows (2k). It will be possible to migrate data out of a 4.0a1 database into some future version. This release contains the top-level persistence, transaction, and zodb packages, as well as zope.interface and zope.testing. The implementation depends on zope.interface, but only in fairly limited way. The zope.testing package is only used by a few unit tests. The zodb package includes FileStorage, two storages based on BerkeleyDB, and ZEO, a client-server protocol for ZODB. Jeremy

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PyCon: Last week for pre-reg!
by Aahz 17 Mar '03

17 Mar '03

Friday, March 21 is the deadline if you want to get the $200 pre-conference price. PyCon will cost $250 at the door, and there is no single-day rate. http://www.python.org/pycon/reg.html PyCon DC 2003 The first PyCon will be held 26-28 March, 2003, at George Washington University's Cafritz Conference Center in Washington DC. There will be a development sprint Mon/Tues before the conference. PyCon is a community-oriented conference targeting developers (both those using Python and those working on the Python project). It gives you opportunities to learn about significant advances in the Python development community, to participate in a programming sprint with some of the leading minds in the Open Source community, and to meet fellow developers from around the world. The organizers have worked hard to ensure that the conference be affordable and accessible to all. We look forward to seeing you there. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ Register for PyCon now! http://www.python.org/pycon/reg.html -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ Register for PyCon now! http://www.python.org/pycon/reg.html

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Releasing RevisionManager 1.1 and ZopeTree 1.1
by Philipp von Weitershausen 17 Mar '03

17 Mar '03

Hello everybody, I am releasing the long-awaited RevisionManager 1.1 final. This new version adds a great deal to the usability of the product and I recommend to everybody who is using 1.0.X to upgrade. The changes since the release candidate include: * Upgrade from 1.0 to 1.1 is completely painless now. Instances of RevisionManager do not have to be deleted and created again. * Various bugfixes have been applied to make it run under Zope 2.4 again. * Changes made to objects that result to the status 'Locally Modified' can now be reverted. * When a user expands a folder node in a ZMI tree, the browser will automatically scroll the page down to the expanded folder node. You may download RevisionManager at: http://www.zope.org/Members/philikon/RevisionManager Simultaneously I am releasing a bugfix release of ZopeTree. ZopeTree is a light-weight and easy-to-use tree implementation and was originally part of RevisionManager. It has now been factored out as a separate product. The most important bugfix in this release makes it run under Zope 2.4. You may download ZopeTree at: http://www.zope.org/Members/philikon/ZopeTree Cheers, Phil

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RSessionDA 1.0-rc1 released.
by Warnes, Gregory R 14 Mar '03

14 Mar '03

Release 1.0-rc1 of RSessionDA is now available. This version provides significantly improved security and should now be usable on public internet sites. Description: RSessionDA provides Zope objects for interacting with R <http://www.r-project.org>, an open-source language for statistical computing and graphics. These objects permit evaluation of functions in the R language using information in Zope. R data objects, graphics files, printed output, script transcripts, and data files can be returned to Zope for display. These tools make it easy to create web applications that include advanced statistical functionality. See <http://software.biostat.washington.edu/statsoft/snake/RSessionDA> for details. LEGAL NOTICE Unless expressly stated otherwise, this message is confidential and may be privileged. It is intended for the addressee(s) only. Access to this E-mail by anyone else is unauthorized. If you are not an addressee, any disclosure or copying of the contents of this E-mail or any action taken (or not taken) in reliance on it is unauthorized and may be unlawful. If you are not an addressee, please inform the sender immediately.

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Releasing ZopeTree 1.0
by Philipp von Weitershausen 14 Mar '03

14 Mar '03

Hello everybody, I am releasing ZopeTree, a spin-off product from RevisionManager. ZopeTree is a light-weight and easy-to-use tree implementation, mainly designed for use in ZPTs. I wrote ZopeTree because I found ZTUtils.Tree too complicated and not flexible enough. There is no explicit README file, but you should be able to read everything from the interfaces. The product also comes with two example PageTemplates. You may download ZopeTree at: http://www.zope.org/Members/philikon/ZopeTree Regards, Phil

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