"Guido" == Guido van Rossum guido@CNRI.Reston.VA.US writes:
Guido> The raise could easily enforce this, but it would break Guido> lots of existing code.
Maybe not (I'm not sure). All the standard exceptions inherit from Exception, and of course there'd be nothing to enforce for existing user-defined string based exceptions. How pervasive are user-defined class based exceptions that don't inherit from Exception? (I don't know, and I haven't grepped, but I think we've been making that recommendation from day 1 of class-based standard exceptions, and I try to follow this recommendation in my own code).
Guido> I wish I had done it right from the start -- then Guido> exceptions would have been classes from the start and would Guido> have required inheritance from the Exception base class. Guido> Like in Java. (And in C++?)
All Hail, Python 2.0, our Savior and Redeemer! :)