In the sample code I attached, z is an instance of MySet under 3.0rc2.  Is 
that expected?

Thanks,
Alex

Mark Dickinson wrote:
> Mark Dickinson <dickinsm@gmail.com> added the comment:
> 
> The bug is that the set operations return instances of the subclass,
> rather than instances of set.
> 
> This is already fixed for 3.0: see issue 1721812.  It was deemed too risky 
> to backport the change to 2.x.
> 
> ----------
> assignee: theller -> 
> components: +Interpreter Core -ctypes
> nosy: +marketdickinson
> resolution:  -> duplicate
> status: open -> closed
> 
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue4357>
> _______________________________________