[Python-Dev] Deprecating string exceptions (original) (raw)

Martin v. Loewis martin@v.loewis.de
27 Mar 2002 23:17:02 +0100

Guido van Rossum <guido@python.org> writes:

> Paul Prescod <paul@prescod.net> writes: > > > Should it be arbitrary objects or just subclasses of exception: "It is > > recommended that user-defined exceptions in new code be derived from > > Exception, although for backward compatibility reasons, this is not > > required. Eventually this rule will be tightened."

[Martin] > If that is the rule, the bug report can be closed as "not-a-bug". I seem to have a particularly dense day. :-( What does "that" (in "If that is the rule") refer back to?

"user-defined exceptions be derived from Exception". It is only a recommendation in the sense that you can use arbitrary classic classes. If the rule is eventually tightened, it is ok if new-style classes are not allowed as exceptions right now. An action is only needed if you pronounce that it is desirable to allow new-style classes as exceptions - which would necessarily have a base class that is not derived from Exception.

Regards, Martin