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