Hello, Thanks Tres, looks like zope 2.7.5/python 2.3.5 is triggering a genuine full-blown error on my code python:here.sponsors[0] != '' if the tuple is empty, whereas 2.5.1/2.1.3 must have been returning some equivalent of boolean 'false' when the tuple was empty. Now I do this python: (here.sponsors) and (here.sponsors[0] != '') and it works again. The second condition may be redundant now I suppose...? thanks, John S. --- Tres Seaver <tseaver@palladion.com> wrote:

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John Schinnerer wrote:

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Hello,

I have just migrated some custom products from 2.5.1 to 2.7.5, meaning from python 2.1.3 to 2.3.5.

I have this bit of code in the index_html page template in the product, which rendered just fine in zope 2.5.1/python 2.1.3:

<span tal:condition="python:here.sponsors[0] != ''" tal:omit-tag=""> <h4>Sponsors</h4> <span tal:repeat="line here/sponsors" tal:omit-tag=""> <h5 tal:content="line" /> </span> </span>

sponsors is a lines property in the custom product, like so:

{'id':'sponsors', 'type':'lines', 'mode':'w'},

Now, in zope 2.7.5/python 2.3.5, I get an error on this part of the above code:

python:here.sponsors[0] != ''

as follows:

Exception Type IndexError Exception Value tuple index out of range

Can anyone tell me what's up with this? It worked fine in 2.5.1, now it gives this error in 2.7.5...help...

Thanks, John S.

And here's the complete...

Traceback (innermost last):

* Module ZPublisher.Publish, line 101, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 39, in call_object * Module Shared.DC.Scripts.Bindings, line 306, in __call__ * Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec * Module Products.PageTemplates.PageTemplateFile, line 106, in _exec * Module Products.PageTemplates.PageTemplate, line 96, in pt_render <PageTemplateFile at /growingthroughit.org/galleryitems/bg/tw0110/index_html> * Module TAL.TALInterpreter, line 190, in __call__ * Module TAL.TALInterpreter, line 234, in interpret * Module TAL.TALInterpreter, line 671, in do_useMacro * Module TAL.TALInterpreter, line 234, in interpret * Module TAL.TALInterpreter, line 694, in do_defineSlot * Module TAL.TALInterpreter, line 234, in interpret * Module TAL.TALInterpreter, line 636, in do_condition * Module Products.PageTemplates.TALES, line 221, in evaluate URL: index_html Line 58, Column 0 Expression: <PythonExpr here.sponsors[0] != ''> Names:

{'container': <GTIGalleryItem at /growingthroughit.org/galleryitems/bg/tw0110>, 'context': <GTIGalleryItem at /growingthroughit.org/galleryitems/bg/tw0110>, 'default': <Products.PageTemplates.TALES.Default instance at 0x40ad2aec>, 'here': <GTIGalleryItem at /growingthroughit.org/galleryitems/bg/tw0110>, 'loop': <SafeMapping instance at 40f297c0>, 'modules': <Products.PageTemplates.ZRPythonExpr._SecureModuleImporter instance at 0x40acccac>, 'nothing': None, 'options': {'args': ()}, 'repeat': <SafeMapping instance at 40f297c0>, 'request': <HTTPRequest,

URL=http://www.growingthroughit.org/galleryitems/bg/tw0110/index_html>,

...

'root': <Application instance at 4189acb0>, 'template': <PageTemplateFile at /growingthroughit.org/galleryitems/bg/tw0110/index_html>, 'traverse_subpath': [], 'user': Anonymous User}

* Module Products.PageTemplates.ZRPythonExpr, line 47, in __call__ __traceback_info__: here.sponsors[0] != '' * Module Python expression "here.sponsors[0] != ''", line 1, in <expression> * Module AccessControl.ZopeGuards, line 67, in guarded_getitem

IndexError: tuple index out of range

Try the following in your Zope 2.7.x sandbox:

$ bin/zopectl debug ...

...

...

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here = app['growingthroughit.org].galleryitems/bg/tw0110 print here.sponsors

If the output is '()', then your sponsors attribute is an empty tuple, which would explain the traceback.

____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs

Aloha,

...

python:here.sponsors[0] != ''

if the tuple is empty, whereas 2.5.1/2.1.3 must have been returning some equivalent of boolean 'false' when the tuple was empty.

No. Python 2.1.3 would have blown up the same way.

Must have been Zope 2.5.1 somehow turning the python blowup into equivalent of boolean 'false' then, or my clearly less than exemplary code would have also failed under 2.5.1, as it does under 2.7.5.

...

Now I do this

python: (here.sponsors) and (here.sponsors[0] != '')

and it works again. The second condition may be redundant now I suppose...?

No it is not redundant. A value ('',) would still be True as far as Python is concerned and would pass the first condition.

Right, thanks! John S. ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs