[issue20440] Use Py_REPLACE/Py_XREPLACE macros

[Martin v. Löwis]

Martin v. Löwis added the comment:

I think Raymond's original concern still applies: The macros do add to the learning curve. I would personally expect that Py_REPLACE(op, op2) does an INCREF on op2, but it does not.

Explicit is better than implicit.

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nosy: +loewis

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<http://bugs.python.org/issue20440>
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