• WritingExceptionClasses

Writing Exception Classes

I (LionKimbro) don't know much about writing exception classes; Here's hoping someone rewrites this better.

Exception classes are not special, you just derive them from Exception:

   1 class HostNotFound(Exception):
   2     def __init__( self, host ):
   3         self.host = host
   4         Exception.__init__(self, 'Host Not Found exception: missing %s' % host)

You may later write:

   1 try:
   2     raise HostNotFound( "taoriver.net" )
   3 except HostNotFound, X:
   4     # Handle exception.
   5     # "X" is the HostNotFound instance.

See Also

HandlingExceptions, TracebackModule

Questions

• How do you relay the traceback information? Relay the traceback information? Moving it higher up the call-stack? Could you try to explain your question?

  • When you're logging exceptions, you want access to the traceback information to. After some research, I believe what you use is extract_tb or extract_stack from the traceback module. -- 216.254.10.130 DateTime(2003-09-07T15:23:43Z)

• What better exception-foo is out there?