[Python-Dev] Mutable exceptions? (was Re: PEP 293, Codec Error Handling Callbacks)
Guido van Rossum
Fri, 16 Aug 2002 09:17:40 -0400
> > I'd say definitely. Code like this looks reasonable to me:
> > def some_function(arg):
> > try:
> > call_some_other_function(arg)
> > except SomeExpectedExceptionClass, obj:
> > obj.add_context(arg)
> > raise
> > Then some outer piece of code catches exceptions and produces a
> > traceback augmented by information added by various calls to
> > add_context().
> So, if add_context() changes any exception attribute that was
> originally specified in the constructor and is thus part of
> the args attribute, should this change be reflected in the
> args attribute?
Usually yes, but that's up to the class that defines add_context().
--Guido van Rossum (home page: http://www.python.org/~guido/)