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

Guido van Rossum guido@python.org
Thu, 28 Mar 2002 07:48:40 -0500

> > >>> class Z(str,Exception): > > ... pass > > Legal, but not particularly useful. Anyway, I think that "derives > from Exception" overrules "derives from str" here, so this should be > allowed. Note that currently it creates a new-style class and thus it > doesn't work.

What do you mean, it doesn't work? >>> class Z(str,Exception):pass ... >>> exc = Z("Hallo") >>> try: ... raise exc ... except exc: ... print "Gefangen" ... Gefangen

But if you try "except Exception:" or "except Z:" instead, it doesn't work. Very surprising.

--Guido van Rossum (home page: http://www.python.org/~guido/)