[issue14199] Keep a refence to mro in _PyType_Lookup() and super_getattro()

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

Looks good to me. 

The INCREF/DECREFs are outside of the loops so will have negligible performance impact.

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nosy: +Mark.Shannon

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14199>
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