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Wed Jan 29 19:24:41 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-January/132177.html

The Py_CLEAR macros is used as safe alternative for following unsafe 
idiomatic code:

     Py_XDECREF(ptr);
     ptr = NULL;

But other unsafe idiomatic code is widely used in the sources:

     Py_XDECREF(ptr);
     ptr = new_value;

Every occurrence of such code is potential bug for same reasons as for 
Py_CLEAR.

It was offered [1] to introduce new macros Py_REPLACE and Py_XREPLACE 
for safe replace with Py_DECREF and Py_XDECREF respectively. 
Automatically generated patch contains about 50 replaces [2].

[1] http://bugs.python.org/issue16447
[2] http://bugs.python.org/issue20440

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Showing content from https://mail.python.org/pipermail/python-dev/2014-January/132177.html below:

[Python-Dev] Add Py_REPLACE and Py_XREPLACE macros