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
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