Issue #15535: Fix pickling of named tuples.

Lib/collections.py

@@ -281,6 +281,10 @@ class {typename}(tuple):
         'Return self as a plain tuple.  Used by copy and pickle.'
         return tuple(self)
 
+    def __getstate__(self):
+        'Exclude the OrderedDict from pickling'
+        return None
+
 {field_defs}
 '''
 

Lib/test/test_collections.py

@@ -272,6 +272,7 @@ class TestNamedTuple(unittest.TestCase):
                 q = loads(dumps(p, protocol))
                 self.assertEqual(p, q)
                 self.assertEqual(p._fields, q._fields)
+                self.assertNotIn(b'OrderedDict', dumps(p, protocol))
 
     def test_copy(self):
         p = TestNT(x=10, y=20, z=30)

Misc/NEWS

@@ -16,6 +16,9 @@ Library
 
 - Issue #17666: Fix reading gzip files with an extra field.
 
+- Issue #15535: Fix namedtuple pickles which were picking up the OrderedDict
+  instead of just the underlying tuple.
+
 
 What's New in Python 3.2.4?
 ===========================