January 2007 - Zope - Zope lists

Different field conversion for lines and ulines : why?
by Pascal Peregrina 11 Jan '07

11 Jan '07

Hi, I would like to know why lines fields are not converted with the same logic as ulines fields in Zpublisher.Converters. lines uses splitlines() while ulines uses split('\n') This gives different result: >>> ''.splitlines() [] >>> ''.split('\n') [''] >>> u''.splitlines() [] >>> u''.split('\n') [u''] So, when creating an empty Zope property for example, ulines version value will be (u'',) while lines version value will be () Thanks. Pascal

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ZSQL Methods and transaction control
by robert rottermann 10 Jan '07

10 Jan '07

Hi there, I am implementing a tool to handle userdata that is stored in a MySQL db. The underlaying logic of the stored procedures used to maintain the db content dictate that I have to control the transactions myself. I understand that there is a way to handle transaction controll in the ZMySQL methods. However I find no documentation at all on how to use it. Without using ZMySQL methods I would be using the following piece of code: db = mysql.connect(host="localhost" ...) cursor = db.cursor() query = "CALL insertUser('%s', '$xxx$', @id, @error);select @id, @error" % 'JohnTheUser' cursor.execute(query) # get the next resultset, it has the result of the select cursor.nextset() result = cursor.fetchall()[0] error = int(result[1]) if error: print "error %s when trying to add user %s" % (ERRRORS[error], 'JohnTheUser') db.rollback() continue #we are in a loop actually .. db.commit() How can I mimic that using ZSQL Methods thanks for any pointers Robert

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TypeError when copy FS python script to custom folder
by Edmund Moseley 10 Jan '07

10 Jan '07

I am in the process of trying to add RAMCaches to my python scripts, and wanted to test it out TTW via custom. However, whenever I make a copy of my FS python script to custom, and then view the object which uses this script, I get the following error: TypeError: arg is not a code object This python script is used by my archetype object to fetch a vocabulary list, by calling a separate zsql method. Any ideas why this happens? Thanks, Edmund Here is the last part of the traceback: <snip> # Module TAL.TALInterpreter, line 281, in interpret # Module TAL.TALInterpreter, line 507, in do_setLocal_tal # Module Products.PageTemplates.TALES, line 221, in evaluate URL: file:MEIS/skins/MEIS/vocab_or_other.pt Line 52, Column 6 Expression: <PythonExpr field.Vocabulary(here)> Names: {'container': <PloneSite at /meis>, 'context': <Autopsy at /meis/meis/unfiledautopsies/b199301068>, 'default': <Products.PageTemplates.TALES.Default instance at 0x2aaab56cb4d0>, 'here': <Autopsy at /meis/meis/unfiledautopsies/b199301068>, 'loop': <Products.PageTemplates.TALES.SafeMapping object at 0x88182d8>, 'modules': <Products.PageTemplates.ZRPythonExpr._SecureModuleImporter instance at 0x2aaab56cb6c8>, 'nothing': None, 'options': {'args': ()}, 'repeat': <Products.PageTemplates.TALES.SafeMapping object at 0x88182d8>, 'request': <HTTPRequest, URL=https://plone.ocme.unc.edu/meis/meis/unfiledautopsies/b199301068/autops…>, 'root': <Application at >, 'template': <FSPageTemplate at /meis/autopsy_view used for /meis/meis/unfiledautopsies/b199301068>, 'traverse_subpath': [], 'user': <PropertiedUser 'zadmin'>} # Module Products.PageTemplates.ZRPythonExpr, line 47, in __call__ __traceback_info__: field.Vocabulary(here) # Module Python expression "field.Vocabulary(here)", line 1, in <expression> # Module Products.Archetypes.Field, line 441, in Vocabulary # Module Products.Archetypes.utils, line 137, in mapply # Module inspect, line 607, in getargs TypeError: arg is not a code object

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Integrating METAL into Zope Product
by Brian Brinegar 10 Jan '07

10 Jan '07

I've got a Zope product which will render itself using standard_html_header and standard_html_footer if they exist. I would like this same product to look for a specific Page Template (ptMaster) and render itself using a macro and filling a slot with it's contents. Any pointers/examples on integrating METAL into a product? Thanks, -- Brian Brinegar Web Systems Developer Engineering Computer Network

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which python version for Zope 2.9.6
by Marcus Schopen 10 Jan '07

10 Jan '07

Hi, is it a problem to use ubuntu's (6.10) standard python 2.4.4c1 for Zope 2.9.6 or Zope 2.10.1 ? If not which version should I build from source? Thanks, Marcus

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Values lost when restarting
by Jonas Nielsen 10 Jan '07

10 Jan '07

Hi this is probably a little vague but any help is appreciated. I'm developing on an old zope application, which I ported from zope 2.5.1 to zope 2.9. The application seems like it's based on the addressbook application in the "Zope Bible" The application is a tool for localization, where translators can log in and edit "translation resources" in "resource folders" I made a function to export all these resources to a csv-file and one to import the values in the zodb again. the text are set using a function on the resource calling def setText(self,language,text, REQUEST=None): # ... some stuff self.texts[language] = text The function works fine and updates the values correctly. But after I restart zope all the changes are lost. This not so when calling the function from the Resource objects web form. The "Zope Bible" says something about calling self.__changed__(1) after updating the value but this doesn't seem to work even though the objects inherits from "Persistent" When importing I fetch the object by using the RestrictedTraverse function, that's really the only difference I can see. Please write if you have ANY idea of what could be the problem.

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Selenium zodb?
by Peter Bengtsson 10 Jan '07

10 Jan '07

How can I run Zope in a non-persistent way so that all transactions are aborted and so that I can run a big fat Selenium script in Firefox without having to manually undo everything the Selenium script has done? Kind of like ZopeTestCase works when you run it. -- Peter Bengtsson, work www.fry-it.com home www.peterbe.com hobby www.issuetrackerproduct.com

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Isn't DTML more like what other frameworks do?
by Mark, Jonathan (Integic) 10 Jan '07

10 Jan '07

"""Why (the hell) are you (still) using DTML (as newbie). You are strongly encouraged to use ZPT.""" My sense is that ZPT solves a problem which for most of us does not exist. If you wish to have designers work directly on markup in an HTML WYSIWYG editor then yes, ZPT is great. But most of us create our own HTML anyway. And for us it doesn't matter if DTML works in a WYSIWYG HTML editor, because we don't use the latter. What does matter is that DTML is very similar to RHTML (as in Ruby On Rails), ASP, etc. ZPT requires a new way of thinking. I would much rather convert RHTML to or from DTML than to or from ZPT. So I don't really get the benefit of using ZPT. The fact that no one outside of Zope seems to have created a ZPT-like solution suggests to me that ZPT, as I said, solves a problem which doesn't exist.

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Reminder: Early Bird Registration for PyCon Ending Soon
by Jeff Rush 10 Jan '07

10 Jan '07

Greetings. As the co-chair for the upcoming Python conference, being held in Dallas (Addison) Texas, I want to remind folk to register before early bird registration prices end. The event is the fifth international Python Conference, being held Feb 23-25, 2007 at the Marriott-Quorum in Addison Texas, with early-bird registration ending **Jan 15**. The conference draws approximately 400-500 attendees from diverse backgrounds such as scientists from national and medical labs, college/K-12 educators, web engineers and the myriad of IT developers and programming hobbyists. Those new to the Python language are welcome, and we're offering a half-day "Python 101" tutorial on the day before the conference, Thursday Feb 22 to help you get up to speed and better enjoy the rest of the conference. We have a great selection of talks this year, some of which that are relevant to Zope are: - Web Frameworks Panel - Introduction to Zope 3 - The Component Architecture - Panel: State of Zope - WSGI: An Introduction - Using Python Eggs - Distributing your project with Python Eggs - Half-Day Tutorial: zc.buildout and the Zope Component Architecture - Half-Day Tutorial: How to Document a Python Open Source Project Being run by the Python community as a non-profit event, the conference strives to be inexpensive, with registration being only $260 (or $195 if you register prior to Jan 15th), with a further discount for students. On the day before the conference we are running a full day of classroom tutorials (extra charge per class) and then after the conference is a free four-days of sprints, which are informal gatherings of programmers to work together in coding on various projects. Sprints are excellent opportunities to do agile pair-programming side-by-side with experienced programmers and make new friends. Other activities are lightning talks, which are 5-minute presentations to show off a cool technology or spread the word about a project, open space talks, which are spontaneous gatherings around a topic and, new this year, a Python Lab where experienced and novice programmers will work together to solve challenging problems and then present their solutions. The conference is also running four keynote talks by leaders in the programming field, with a special focus on education this year: "The Power of Dangerous Ideas: Python and One Laptop per Child" by Ivan Krstic, senior member of the One Laptop per Child project "Premise: eLearning does not Belong in Public Schools" by Adele Goldberg, of SmallTalk fame "Python 3000" by Guido van Rossum, creator of Python "The Importance of Programming Literacy" by Robert M. "r0ml" Lefkowitz, a frequent speaker at O'Reilly conferences I believe you will find the conference educational and enjoyable. More information about the conference along with the full schedule of presentations with abstracts, is available online: http://us.pycon.org/ Thanks for any help you can give in spreading the word, Jeff Rush Co-Chair PyCon 2007

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Why the same directories:instance and skel
by Steve Han 10 Jan '07

10 Jan '07

I found thar subdirectory instance has completly the same as subdirectory skel in zope's home directory.What consideration for that from point of view of software designing?Thanks a lot. -- Steve Han

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