Fix issue 3395, update _debugInfo to be _debug_info
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index 22a759c..b6a0d9b 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -1037,7 +1037,7 @@
         gc.collect()                       # do garbage collection
         refs = self.manager._number_of_objects()
         if refs != EXPECTED_NUMBER:
-            print self.manager._debugInfo()
+            print self.manager._debug_info()
 
         self.assertEqual(refs, EXPECTED_NUMBER)