diff -r 4acdb324a430 Lib/plistlib.py
--- a/Lib/plistlib.py	Wed Apr 06 23:02:46 2016 +0300
+++ b/Lib/plistlib.py	Thu Apr 07 22:56:24 2016 +0300
@@ -224,11 +224,11 @@ class Data:
 
     def __eq__(self, other):
         if isinstance(other, self.__class__):
-            return self.data == other.data
-        elif isinstance(other, str):
-            return self.data == other
+            return self.data.__eq__(other.data)
+        elif isinstance(other, bytes):
+            return self.data.__eq__(other)
         else:
-            return id(self) == id(other)
+            return NotImplemented
 
     def __repr__(self):
         return "%s(%s)" % (self.__class__.__name__, repr(self.data))
diff -r 4acdb324a430 Lib/test/test_plistlib.py
--- a/Lib/test/test_plistlib.py	Wed Apr 06 23:02:46 2016 +0300
+++ b/Lib/test/test_plistlib.py	Thu Apr 07 22:56:24 2016 +0300
@@ -506,15 +506,15 @@ class TestPlistlibDeprecated(unittest.Te
 
         cur = plistlib.loads(buf)
         self.assertEqual(cur, out_data)
-        self.assertNotEqual(cur, in_data)
+        self.assertEqual(cur, in_data)
 
         cur = plistlib.loads(buf, use_builtin_types=False)
-        self.assertNotEqual(cur, out_data)
+        self.assertEqual(cur, out_data)
         self.assertEqual(cur, in_data)
 
         with self.assertWarns(DeprecationWarning):
             cur = plistlib.readPlistFromBytes(buf)
-        self.assertNotEqual(cur, out_data)
+        self.assertEqual(cur, out_data)
         self.assertEqual(cur, in_data)