On Wed, Jun 11, 2008 at 2:25 AM, simone <[EMAIL PROTECTED]> wrote: > Christopher Spears ha scritto:
>> Traceback (most recent call last): >> File "<stdin>", line 1, in ? >> TypeError: Error when calling the metaclass bases >> Cannot create a consistent method resolution >> order (MRO) for bases B, A >> >> What does this error message mean? The example worked in the book. I >> checked in the docs and could not find anything. > > http://www.python.org/download/releases/2.3/mro/ In layman's terms: For class C, the method resolution order is C, B, A, object. Note that B is before A. For class D, A would come before B because of the order of declaration of base classes. This conflict causes the TypeError. One way to fix it is to define D as class D(B, A): pass Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
