Christopher Spears ha scritto:

I've been working out of Core Python Programming (2nd Edition).  Here is an 
example demonstrating multiple inheritance.

class A(object):
...     pass
...
class B(A):
...     pass
...
class C(B):
...     pass
...
class D(A, B):
...     pass
...
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/
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