Serhiy Storchaka added the comment:

And here is a patch which replaces "Py_XDECREF(identifier); identifier = NULL;" 
to "Py_CLEAR(identifier);" (10 replaces in 7 files). It doesn't fix any bug 
(unless identifier is global variable), but makes a code a little cleaner. 
Compilers should generate equivalent code for both writing. It would be good to 
commit it too.

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Added file: http://bugs.python.org/file33799/py_xdecref_clear-3.4.patch

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