[Zope] Catching specific exceptions in Python Script?

Hi all I would like to be able to catch specific exceptions with Python Scripts: eg. try: ..... except Exception, e: ..... of try: .... except sql.error, e: .... This doesn't work as none of these exceptions are imported, also I cannot import them due to the import constraints of Python Scripts. Is there a workaround for this other than using external methods? Etienne