[Zope] Re: Uncaptured python exception

[Jon Emmons]

Ok,

Your statements have just helped me A LOT!

I began to look at the menu structure of our app and it goes something like
this:

<dtml-try>
<dtml-let report="REQUEST.SESSION.get('choice')>
<dtml-if expr="report == 'ReportName'">
<dtml-var report_one>
</dtml-if>
</dtml-let>
<dtml-except>
Show report menu...
</dtml-try>

Which would cause all exceptions to be captured and throw you back to the
menu.  I clearly need to restructure this piece of code.

This was obscuring my python errors.

My apologies, and my thanks for helping me think this out.

Jon

-----Original Message-----
From: zope-bounces at zope.org [mailto:zope-bounces at zope.org] On Behalf Of Tres
Seaver
Sent: Thursday, May 31, 2007 12:04 PM
To: zope at zope.org
Subject: [Zope] Re: Uncaptured python exception

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Jon Emmons wrote:
> Sometimes, I do get those errors.
> 
> But if I take a working piece of python and stick in a sabotage statement
> like:
> 
> Var1 = var2
> 
> Where var2 is undefined (i.e. has never been assigned anything)
> 
> Just silent failure.  No error.

Sorry, but without a full recipe to reproduce this, I don't believe you;
 Zope raises exceptions just fine, and catches them itself only at the
publisher layer, where they get rendered into a standard error message,
as well as being dumped to the 'error_log' object.  The effect you
describe would only occur if some piece of application code (your
script, or something that calls it) were swallowing the exception with a
'try: ... except: pass' (or similar).

I would need to see the entire text of your script, plus whether this is
a PythonScript, an ExternalMethod, or some bit of filesystem product
code.  I would also need to know what version of Zope and Python you are
using.


Tres.
- --
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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