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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