On 7/30/05, James Y Knight <[EMAIL PROTECTED]> wrote: > On Jul 29, 2005, at 11:07 PM, Robert Brewer wrote: > > > I'd recommend not subclassing SystemExit--there are too many programs > > out there which expect the argument (e.g. sys.exit(3)) to mean > > something > > specific, but that expectation doesn't apply at all to SystemError. > > Yes please make note of this for *all* exception (and otherwise) > inheritance. You must ensure that any exception B that inherits from > A conforms to A's interface! If that isn't the case, it shouldn't > inherit. Lots of people seem to forget this, and it's always a pain > in the ass. >
The reason for requiring inheriting from Raisable is so that the basic interface will be guaranteed for any caught exception. And I don't think that any of the built-ins have any specific attributes sans maybe OSError, but that is a leaf in the inheritance tree so that is not a problem. Don't worry, the interfaces won't change in the middle of a branch. -Brett _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
