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Would anyone be opposed to adding the following simple macro, which would be the same as the one we have for Py_RETURN_NONE. I recently found myself doing the Py_INCREF/return dance several times and ended up leaving an incref out in a few spots, which the macro form nicely handles.
diff --git a/Include/object.h b/Include/object.h
--- a/Include/object.h
+++ b/Include/object.h
@@ -792,6 +792,10 @@
 PyAPI_DATA(PyObject) _Py_NotImplementedStruct; /* Don't use this directly */
 #define Py_NotImplemented (&_Py_NotImplementedStruct)
+/* Macro for returning Py_NotImplemented from a function */
+#define Py_RETURN_NOTIMPLEMENTED \
+ return Py_INCREF(Py_NotImplemented), Py_NotImplemented
+
 /* Rich comparison opcodes */
 #define Py_LT 0
 #define Py_LE 1
If this is fine, I can also take care of making the replacements, of which there are apparently 55.