February 2001 - Zope

PythonScript getting at various Python libraries
by Gerald Gutierrez 21 Feb '01

21 Feb '01

I'd like to get access to a bunch of libraries that Python has, like "re" and "time" and "xml" and "md5", etc. What is the standard way that I can go about doing this?

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Re: [Zope] creating and using a python object
by Dieter Maurer 21 Feb '01

21 Feb '01

Joh Johannsen writes: > > --------------196F8623CF0502D1DE9F15CC > Content-Type: text/plain; charset=us-ascii > Content-Transfer-Encoding: 7bit Please, do not post MIME messages! > At the moment, I guess it is impossible to use Python instances within > Zope. (I'm surprised, something does not sound right about this...) That, of course, is not right. It is just that such instances must fulfill some conditions. > Here is what the Zope Book says: > > > Problems can occurr if you hand instances of your own classes to Zope and expect them to work like Zope objects. For example, you cannot define a class in an > > External Method script file and assign it as an attribute of a Zope object. This causes problems with Zope's persistence machinary. Thus, you define them outside of an "External Method" source file, in a standard Python module. > > You also cannot easily hand > > instances of your own classes over to DTML or Scripts. The issue here is that your instances won't have Zope security information. You can define and use your > > own classes and instances to your heart's delight, just don't expect Zope to use them directly. Limit yourself to handing Zope simple Python structures like > > dictionaries and lists or Zope objects Alternatively, provide the necessary security information. There is a document from Brian at Zope.org that tells you what you need to do. > I'm not so sure about this "causes problems with Zope's persistence > machinery"... what does that mean? Zope stores pickles (--> Python documentation) for objects. A pickle for a class instance (usually) consists of a class reference and the pickles for the instance's members. A class reference consists of the module the class is defined in and the class name. Due to this implementation, there are a number of restrictions: * Python's pickle module requires the class to be defined at the global level of the module. This is because unpickling will import the module and then needs to access the class through its name. This would not be possible, if the class were defined in deeper structures. * "External Method" source files are not imported as modules by Zope but are instead read. For Python's pickle module, it appears as though they belong to the module "__main__". Of course, if Python imports "__main__" and looks for your class (defined in the External Method source file), it will not find the class. Thus, your object cannot be unpickled. Dieter

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Re: [Zope] Re: Exceptions and Python Scripts
by Dieter Maurer 21 Feb '01

21 Feb '01

Chris Withers writes: > Put these two together and and you need to use sys.exc_info() to analyse the > type and value to decide whether you should re-raise it or not. > Of course, you're not allowed to import anything from sys in Python Scripts so > you're left with no options. Didn't you learn recently how to allow selective access to module content? You asked the list about the standard way to do this and got an excellent response from Brian. Thus, you have an option. Maybe not the most optimal possible, though.... Dieter

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Re: [Zope] sendmail host hardcoded ?
by Dieter Maurer 21 Feb '01

21 Feb '01

Gijs Reulen writes: > I am trying to pass a variable with the hostname to the smtphost parameter > of sendmail: > ... > <dtml-sendmail > smtphost="PARENTS[_.len(PARENTS)-1].getProperty('mail_smtphost')"> > ... > This results in a host not found error. However, when I hardcode the > smtphost like: > > <dtml-sendmail smtphost="192.168.0.20"> > > This works. It take the attribute value (without evaluation) as host name. If you really need, you may extend "sendmail": The usual proceedure would be to provide an additional attribute "smtphost_expr" that behaves exactly like "smtphost" but expects a Python expression as attribute value, evaluates it and the uses it as "smtphost" would do, if it got this attribute. The attributes of "dtml-mime" have been extended along this line. You may look at them on how to implement it. Dieter

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Re: [Zope] Understanding dtml and/or its variables
by Dieter Maurer 21 Feb '01

21 Feb '01

Damir Bartakovic writes: > I am using ZnolkSQLWizard and it creates output like > <INPUT TYPE="TEXT" NAME="table.name"> ... > > Now I am trying to force the user not to leave the field blank. > Usually it works with <dtml-unless "somevariable"> ... once again! > ....</dtml-unless> > > but with <dtml-unless "table.name"> ... I get the error: > Error Type: NameError > Error Value: table (The Traceback is at the end) > > Like it seems it don't like the '.'? It likes '.' but interprets it differently: Inside "...", you are in the realm of Python expressions. In Python, the "." is not part of a name (as in DTML) but it is an operator: the left operand is an object, the right one a name and the result is the object's attribute of the given name. You can use, e.g. "_['table.name']" to access the object with name "table.name" from Python. The official Zope book and URL:http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html will tell you more about these issues. Dieter

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Re: [Zope] Documentation Questions
by Dieter Maurer 21 Feb '01

21 Feb '01

Andrew Williams writes: > I have a couple of questions about the best place to get > information on objects, methods and properties.=20 You may try to use my DocFinder product: URL:http://www.dieter.handshake.de/pyprojects/zope/DocFinder.html Dieter

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simple question about 
by Donald Braman 21 Feb '01

21 Feb '01

I'm having trouble making a simple text comparison (my very first in Zope). I can get Zope to give me results for just , but not for yesno <tr> <td>yesno Here's the error I get: Zope Error Zope has encountered an error while publishing this resource. Error Type: SyntaxError Error Value: invalid syntax Traceback (innermost last): File /usr/local/zope/230/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/local/zope/230/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/zope/230/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: index_html) File /usr/local/zope/230/lib/python/ZPublisher/Publish.py, line 171, in publish File /usr/local/zope/230/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_edit) File /usr/local/zope/230/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: manage_edit) File /usr/local/zope/230/lib/python/OFS/DTMLDocument.py, line 144, in manage_edit (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_String.py, line 388, in munge (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_String.py, line 408, in cook (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_String.py, line 242, in parse (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_String.py, line 292, in parse_block (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_String.py, line 242, in parse (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_String.py, line 305, in parse_block (Object: index_html) File /usr/local/zope/230/lib/python/DocumentTemplate/DT_If.py, line 165, in __init__ File /usr/local/zope/230/lib/python/DocumentTemplate/DT_Util.py, line 386, in name_param (Info: ({'expr': "fieldname = 't'"}, 'if', 1, 'name')) File /usr/local/zope/230/lib/python/DocumentTemplate/VSEval.py, line 166, in __init__ (Object: fieldname = 't') SyntaxError: (see above)

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Notes on Zope, PostgreSQL, Webmin, and Red Hat 7.0
by Donald Braman 21 Feb '01

21 Feb '01

Here are some notes I took on my (newbie) install of zope, pgsql & red hat: http://www.zope.org/Members/braman/zope_pgsql_rh70. Any corrections or advice on better ways of doing things much appreciated. -Don Donald Braman donald.braman(a)yale.edu

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RE: [Zope] newbie batching question
by Farrell, Troy 21 Feb '01

21 Feb '01

If you are using a DTML Document, you will need to "get out" of it's namespace: <dtml-var standard_html_header> <dtml-with "PARENTS[0]"> <dtml-var "absolute_url()"> <dtml-in expr="objectValues('Image')" size=10 start=query_start> display for any items found: <dtml-var sequence-item> </dtml-in> </dtml-with> <dtml-var standard_html_footer> A DTML Method doesn't require the with statements. Let me know if it still doesn't work. Troy -----Original Message----- From: Chris Cioffi [mailto:other@stopthesanity.org] Sent: Wednesday, February 21, 2001 11:28 AM To: Farrell, Troy Subject: Re: [Zope] newbie batching question It sounded good, but didn't work. So I'm not facing some silly version bug: -Zope 2.3.0 (Linux tarball from the Zope.org website) -Mandrake Linux 7.2 (fully patched) in high security mode -Python 1.5.2 -'rpm -qa | grep python | sort' reports python-1.5.2-12mdk python-devel-1.5.2-12mdk python-docs-1.5.2-12mdk pythonlib-1.23-2mdk rpm-python-3.0.5-27mdk Anyone have another idea? Chris ----- Original Message ----- From: "Farrell, Troy" <troy.farrell(a)wilcom.com> To: "'Chris Cioffi'" <zope(a)stopthesanity.org>; <zope(a)zope.org> Sent: Tuesday, February 20, 2001 10:50 AM Subject: RE: [Zope] newbie batching question > I could be mistaken, but change your line: > <dtml-in expr="objectValues('Images')" size=1 start=query_start> > to this: > <dtml-in expr="objectValues('Image')" size=1 start=query_start> > > Right now, you are looking for the values of each 'Images', not each Image. > > Troy > > > -----Original Message----- > From: Chris Cioffi [mailto:zope@stopthesanity.org] > Sent: Tuesday, February 20, 2001 9:37 AM > To: zope(a)zope.org > Subject: [Zope] newbie batching question > > > Hi all, > > I'm starting to dig into learning Zope. I read through a tutorial and have > been working a bit with the Zope Book and there's where I hit a problem. > > I'm trying to modify the batching example to create a slideshow. > > Here's what I've got: > > <dtml-var standard_html_header> > <dtml-in expr="objectValues('Images')" size=1 start=query_start> > display for any items found: <dtml-var sequence-item> > </dtml-in> > <dtml-var standard_html_footer> > > (This is stripped down from the code in Chapter 7.) > > I've put this in the same folder as the Images and all I get is the header > and footer text with a blank body. (I'll get the sorting later...) > > Any pointers would be welcome. > > Thanks, > > Chris > > PS: I've seen the Photo product on the website however the archive is > corrupted everytime I download it... > > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev ) > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev ) >

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Zope on an IBM S/390
by Ronald L. Roeber 21 Feb '01

21 Feb '01

Maybe others have done this but in case not, I have Zope (2.3) running on a linux virtual machine on an IBM System 390. It installed and started okay. The only product I've installed as of tonight is the latest PTK. I've been told that this is only a test environment and that it can go up and down at the pleasure of the system managers. I was wondering if anyone had something that they thought should be tested in this environment, something that would be beneficial to the Zope cause. Perhaps some load testing or performance measures that might be of use to the Zope community. If Zope could benefit, I'd be glad to let someone run some tests. Who knows, it may be doggier than some hot multi-processor Intel box...it did compile fast though. Ronald L. Roeber University of Nebraska rroeber1(a)unl.edu

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