On May 31, 3:52 pm, LittleGrasshopper <seattleha...@yahoo.com> wrote: > This is some simple code which I got from Guido's paper on the > unification of classes and types, which Arnaud suggested to improve my > knowledge of metaclasses: > > class M1(type): > pass > class M2(M1): > pass > class M3(M2): > pass > class C1: > __metaclass__ = M1 > class C2(C1): > __metaclass__ = M2 > class C3(C1, C2): > __metaclass__ = M3 > > It is failing when processing C3: > Traceback (most recent call last): > File "metaerror.py", line 18, in <module> > class C3(C1, C2): > TypeError: Error when calling the metaclass bases > Cannot create a consistent method resolution > order (MRO) for bases C2, C1 > > Since M3 is a subclass of M1 and M2 (which are the metaclasses for the > bases of C3, I don't understand the error. Then again, the error seems > to reference the MRO. > > I hope this is one of those posts that I can look back in a few months > from now and think "Man, was that a dumb thing to ask!" Until then, I > would appreciate your help in trying to figure out what's going on. > > Lukas
I forgot to say, this is Python 2.5.2 (in case that makes any difference.) -- http://mail.python.org/mailman/listinfo/python-list
