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Tue Apr 17 00:53:20 CEST 2007 · https://mail.python.org/pipermail/python-dev/2007-April/072643.html

I just noticed r53997 (from some unit tests it broke), which disallowed things
like this:

    class X(object):
        def __repr__(self):
            return "blah"

    class Y(X, type):
        pass

    class Z:
        __metaclass__ = Y

Making X classic eliminates the TypeError, and is probably an acceptable fix
in a lot of cases (at least as long as classic classes are available).  I
wonder if the ability to override type special methods like this was considered
when the change was made, though?

Jean-Paul

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[Python-Dev] new metaclass error condition checks