It would be much easier (and preferable) to handle the data processing activities in python (a script or external method) and just use DTML to display the results. You could easily handle the looping, testing in python and then just return 'success' or 'failure' which your DTML method could test for and then display an appropriate message to the user. Jonathan P.S. please don't post in HTML... ----- Original Message ----- From: larrymcdonnell@att.net To: zope@zope.org Sent: Thursday, February 15, 2007 9:34 AM Subject: Re: [Zope] Error trapping Duplicate entry in a database -------------- Original message from larrymcdonnell@att.net: -------------- Hi, Thanks for the pointers but how can I trap for the first error. I am populating a list and if the user makes a mistake and uses the wrong application. I want to display only one message and the link to the correct application. With this code the message is repeated for each entry. <dtml-call "REQUEST.set('student_score1', student_score1_temp[loop_counter])"> <dtml-try> <dtml-call expr="create_holistic_score_record(REQUEST)"> <dtml-except IntegrityError> <dtml-call "REQUEST.set('dup_rec', 'dup')"> <dtml-if expr="dup_rec=='dup'"> This class already exist in the database - Please use Update </dtml-if> </dtml-try> This class already exist in the database - Please use Update This class already exist in the database - Please use Update ... I just want to stop it after the first error. Thanks in advance, Larry _______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )