Issue #15535: Fix pickling of named tuples.

Lib/collections/__init__.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

@@ -273,6 +273,7 @@ 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/ACKS

@@ -811,6 +811,7 @@ Trent Mick
 Jason Michalski
 Franck Michea
 Tom Middleton
+Thomas Miedema
 Stan Mihai
 Stefan Mihaila
 Aristotelis Mikropoulos

Misc/NEWS

@@ -47,6 +47,9 @@ Library
 - Issue #17802: Fix an UnboundLocalError in html.parser.  Initial tests by
   Thomas Barlow.
 
+- Issue #15535: Fix namedtuple pickles which were picking up the OrderedDict
+  instead of just the underlying tuple.
+
 - Issue #17192: Restore the patch for Issue #11729 which was ommitted in
   3.3.1 when updating the bundled version of libffi used by ctypes.  Update
   many libffi files that were missed in 3.3.1's update to libffi-3.0.13.