diff -r 29b8ec9195ff Lib/test/test_enum.py
--- a/Lib/test/test_enum.py	Mon Sep 16 04:03:12 2013 +0200
+++ b/Lib/test/test_enum.py	Mon Sep 16 12:34:27 2013 +0800
@@ -1033,6 +1033,29 @@
             yellow = 6
         self.assertEqual(MoreColor.magenta.hex(), '5 hexlified!')
 
+    def test_attribute_deletion(self):
+        class Season(Enum):
+            SPRING = 1
+            SUMMER = 2
+            AUTUMN = 3
+            WINTER = 4
+
+            def spam(cls): pass
+
+        self.assertTrue(hasattr(Season, 'spam'))
+        del Season.spam
+        self.assertFalse(hasattr(Season, 'spam'))
+
+        with self.assertRaises(AttributeError):
+            del Season.SPRING
+        with self.assertRaises(TypeError):
+            del Season['SPRING']
+        with self.assertRaises(AttributeError):
+            del Season.DRY
+        with self.assertRaises(TypeError):
+            del Season['DRY']
+        with self.assertRaises(AttributeError):
+            del Season.SPRING.name
 
     def test_no_duplicates(self):
         class UniqueEnum(Enum):