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

Samuele Pedroni pedroni@inf.ethz.ch
Wed, 27 Mar 2002 23:38:24 +0100

From: Martin v. Loewis <martin@v.loewis.de>

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

> > 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.

But this is legal in 2.2

class Z(str,Exception): ... pass ... Z.bases (<type 'str'>, <class exceptions.Exception at 0x00757700>) Z.base <type 'str'>

so the issue is more subtle or I'm missing something?

regards.