Neal Norwitz added the comment:

I looked at Guido's latest deldict.diff patch--the one to
Objects/object.c only.  It seems good.  I can't convince myself either
way about the change to Objects/typeobject.c.  I can't think of a way
to cause a problem.  It seems safer to use Py_CLEAR in this case
though.

There are several other uses of _PyObject_GetDictPtr in
Objects/typeobject.c.  It was pretty much the same--I can't convince
myself either way.  Can Py_VISIT cause any Python code to execute that
might lead to a problem?  The other uses of _PyObject_GetDictPtr in
Objects/typeobject.c seemed safer.  Not a very useful review.

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<http://bugs.python.org/issue1303614>
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