[issue20440] Use Py_REPLACE/Py_XREPLACE macros

[Brett Cannon]

Brett Cannon added the comment:

It all seems like a good idea to me and I like the Py_REPLACE naming (I was going to suggest Py_SWAP, but Py_XSWAP looks too weird to me).

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nosy: +brett.cannon

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