diff -r 633bb190fb76 Lib/plistlib.py
--- a/Lib/plistlib.py	Fri Apr 08 08:48:20 2016 +0300
+++ b/Lib/plistlib.py	Fri Apr 08 14:43:29 2016 +0300
@@ -225,10 +225,10 @@ class Data:
     def __eq__(self, other):
         if isinstance(other, self.__class__):
             return self.data == other.data
-        elif isinstance(other, str):
+        elif isinstance(other, bytes):
             return self.data == other
         else:
-            return id(self) == id(other)
+            return NotImplemented
 
     def __repr__(self):
         return "%s(%s)" % (self.__class__.__name__, repr(self.data))
diff -r 633bb190fb76 Lib/test/test_plistlib.py
--- a/Lib/test/test_plistlib.py	Fri Apr 08 08:48:20 2016 +0300
+++ b/Lib/test/test_plistlib.py	Fri Apr 08 14:43:29 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)