On 2005 Jan 16, at 10:28, Martin v. Löwis wrote:
Phillip J. Eby wrote:Couldn't we require new-style exceptions to inherit from Exception? Since there are no new-style exceptions that work now, this can't break existing code.
This would require to make Exception a new-style class, right?
Not necessarily, since Python supports multiple inheritance:
class MyException(Exception, object): .....
there -- a newstyle exception class inheriting from oldstyle Exception. (ClassType goes to quite some trouble to allow this, getting the metaclass from _following_ bases if any).
Without inheritance you might similarly say:
class AnotherOne(Exception):
__metaclass__ = type
...This, in itself, could break existing code.
Not necessarily, see my previous post. But anyway, PJE's proposal is less invasive than making Exception itself newstyle.
Alex
_______________________________________________ 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
