[issue5996] abstract class instantiable when subclassing dict

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

IIRC, classes weren't supposed to be able inherit from two classes that had different metaclasses (since differing metaclasses don't necessarily play well with one another).

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nosy: +rhettinger

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<http://bugs.python.org/issue5996>
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