----- Original Message ----- From: "David Bear" <David.Bear@asu.edu> To: "zope" <Zope@zope.org> Sent: Friday, July 06, 2007 5:55 PM Subject: [Zope] handling exceptions for external methods
I've begun using external methods and am trying to better understand the context they run and and how to handle exceptions. I have concluded the following (and I don't recall reading some of these in any documentation) (please correct me if I'm wrong)
3 external methods inherit the same namespace available to scripts running inside zope
when you define your external method routine: def xxx(self, ....) you gain access to zope namespace via self (eg. self.REQUEST)
6 external methods must return only strings, but they may be unicode string as long as they are valid xml string data
No. External methods can return any python type you like (lists, tuples, dictionaries, etc).
Something that I don't understand is how to handle an exception. For example, if I have an external method that appends data to the end of a file, if there is an IOException how to I capture it and send a message back to zope with something informative?
Look up try/except in a python lib doc. hth Jonathan