[issue20440] Use Py_REPLACE/Py_XREPLACE macros

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> While we're bikeshedding, how about the more verbose PY_DECREF_AND_ASSIGN? That makes it clearer that an INCREF is not done.

Py_ASSIGN_AND_DECREF would be more correct. And Py_CLEAR can be renamed to Py_CLEAR_AND_XDECREF or Py_ASSIGN_NULL_AND_XDECREF.

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