Weird exception in my, um, exception class constructor

[Terry Reedy]

"Joel Koltner" <zapwireDASHgroups at yahoo.com> wrote in message 
news:Kq__j.177027$ng7.15947 at en-nntp-05.dc1.easynews.com...
| Sounds good to me.  I take it that, if I don't inherit from Exception, 
various
| expected behaviors will break?  (This is what Beazley suggests...)

All builtin exceptions have been in the builtin namespace for a while.  The 
duplicate exceptions module is gone in 3.0,  In 3.0, if not before, all 
exceptions must subclass from one of the builtin exceptions.  Exception is 
the usual choice.

tjr