python · selik · May 12, 2018 · May 23, 2018 · Jun 28, 2018 · Jun 29, 2018
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
@@ -887,18 +887,22 @@ field names, the method and attribute names start with an underscore.
 
 .. method:: somenamedtuple._asdict()
 
-    Return a new :class:`OrderedDict` which maps field names to their corresponding
-    values:
+    Return a new ordered dictionary which maps field names to their
+    corresponding values:
 
     .. doctest::
 
         >>> p = Point(x=11, y=22)
         >>> p._asdict()
-        OrderedDict([('x', 11), ('y', 22)])
+        {'x': 11, 'y': 22}
 
     .. versionchanged:: 3.1
         Returns an :class:`OrderedDict` instead of a regular :class:`dict`.
 
+    .. versionchanged:: 3.8
+        Returns an :class:`dict` instead of a :class:`OrderedDict`,
+        since it can now keep keys the same order as namedtuple fields.
+
 .. method:: somenamedtuple._replace(**kwargs)
 
     Return a new instance of the named tuple replacing specified fields with new

diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
@@ -315,6 +315,14 @@ Changes in the Python API
 * :class:`uuid.UUID` now uses ``__slots__``, therefore instances can no longer
   be weak-referenced and attributes can no longer be added.
 
+* The :meth:`~collections.namedtuple._asdict` method returns a :class:`dict`
+  instead of :class:`collections.OrderedDict`, because :class:`dict` keeps
+  insertion order, which is the same behavior as
+  :class:`collections.OrderedDict`.  Anyone relying on
+  :meth:`~collections.OrderedDict.move_to_end` will want to explicitly construct
+  an :class:`collections.OrderedDict`.
+  (Contributed by Michael Selik in :issue:`33463`.)
+
 
 CPython bytecode changes
 ------------------------

diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
@@ -424,8 +424,8 @@ def __repr__(self):
         return self.__class__.__name__ + repr_fmt % self
 
     def _asdict(self):
-        'Return a new OrderedDict which maps field names to their values.'
-        return OrderedDict(zip(self._fields, self))
+        'Return a new dict which maps field names to their values.'
+        return dict(zip(self._fields, self))
 
     def __getnewargs__(self):
         'Return self as a plain tuple.  Used by copy and pickle.'

diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
@@ -331,6 +331,7 @@ def test_instance(self):
         self.assertEqual(p._fields, ('x', 'y'))                             # test _fields attribute
         self.assertEqual(p._replace(x=1), (1, 22))                          # test _replace method
         self.assertEqual(p._asdict(), dict(x=11, y=22))                     # test _asdict method
+        self.assertEqual(list(p._asdict()), ['x', 'y'])                     # test _asdict ordering
 
         try:
             p._replace(x=1, error=2)

diff --git a/Misc/NEWS.d/next/Library/2018-06-29-13-30-14.bpo-33463.b_BpgK.rst b/Misc/NEWS.d/next/Library/2018-06-29-13-30-14.bpo-33463.b_BpgK.rst
@@ -0,0 +1,3 @@
+namedtuple._asdict returns dict instead of OrderedDict, since dict now
+keeps keys in insertion order, the same as OrderedDict. Patch by Michael
+Selik.