Re: R: [Python-Dev] Deprecating string exceptions

March 28, 2002


      ...
...
...
...
...
...
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/)