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Showing content from http://mail.python.org/pipermail/python-dev/2003-April/034910.html below:

[Python-Dev] Metatype conflict among bases?

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Consider:

    class A(object):
        class __metaclass__(type):
            pass

    class B(A):  # TypeError: metatype conflict among bases
        class __metaclass__(type):
            pass

Now that's a weird error message at least!  There's only one base (A),
and I'm telling Python explicitly to use the nested __metaclass__
instead of A's __metaclass__!

Should I not be surprised that Python won't let me set the metatype
explicitly?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com

• Previous message: [Python-Dev] Data Descriptors on module objects (was Re: draft PEP: Trace and Profile Support for Threads)
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