_Py_ReleaseInternedStrings(): Private API function to decref and

release the interned string dictionary.  This is useful for memory
use debugging because it eliminates a huge source of noise from the
reports.  Only defined when INTERN_STRINGS is defined.

Include/stringobject.h

@@ -65,9 +65,11 @@ extern DL_IMPORT(PyObject *) _PyString_FormatLong(PyObject*, int, int,
 #ifdef INTERN_STRINGS
 extern DL_IMPORT(void) PyString_InternInPlace(PyObject **);
 extern DL_IMPORT(PyObject *) PyString_InternFromString(const char *);
+extern DL_IMPORT(void) _Py_ReleaseInternedStrings(void);
 #else
 #define PyString_InternInPlace(p)
 #define PyString_InternFromString(cp) PyString_FromString(cp)
+#define _Py_ReleaseInternedStrings()
 #endif
 
 /* Macro, trading safety for speed */

Objects/stringobject.c

@@ -3217,3 +3217,13 @@ PyString_Fini(void)
 	}
 #endif
 }
+
+#ifdef INTERN_STRINGS
+void _Py_ReleaseInternedStrings(void)
+{
+	if (interned) {
+		Py_DECREF(interned);
+		interned = NULL;
+	}
+}
+#endif /* INTERN_STRINGS */