Fix named tuples to work with vars().

4 files changed, 7 insertions, 1 deletions

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index f3b068c9c0..79db55ec40 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -623,6 +623,8 @@ they add the ability to access fields by name instead of position index.
                'Return a new OrderedDict which maps field names to their values'
                return OrderedDict(zip(self._fields, self))
    <BLANKLINE>
+           __dict__ = property(_asdict)
+   <BLANKLINE>
            def _replace(_self, **kwds):
                'Return a new Point object replacing specified fields with new values'
                result = _self._make(map(kwds.pop, ('x', 'y'), _self))
diff --git a/Lib/collections.py b/Lib/collections.py
index b904980555..2b6abd879f 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -268,6 +268,8 @@ class {typename}(tuple):
         'Return a new OrderedDict which maps field names to their values'
         return OrderedDict(zip(self._fields, self))
 
+    __dict__ = property(_asdict)
+
     def _replace(_self, **kwds):
         'Return a new {typename} object replacing specified fields with new values'
         result = _self._make(map(kwds.pop, {field_names!r}, _self))
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 2b7b68be88..ccf93c51c1 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -180,12 +180,12 @@ class TestNamedTuple(unittest.TestCase):
         self.assertRaises(TypeError, eval, 'Point(XXX=1, y=2)', locals())   # wrong keyword argument
         self.assertRaises(TypeError, eval, 'Point(x=1)', locals())          # missing keyword argument
         self.assertEqual(repr(p), 'Point(x=11, y=22)')
-        self.assertNotIn('__dict__', dir(p))                              # verify instance has no dict
         self.assertNotIn('__weakref__', dir(p))
         self.assertEqual(p, Point._make([11, 22]))                          # test _make classmethod
         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(vars(p), p._asdict())                              # verify that vars() works
 
         try:
             p._replace(x=1, error=2)
diff --git a/Misc/NEWS b/Misc/NEWS
index baf235c23e..16a0f290fb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -22,6 +22,8 @@ Core and Builtins
 Library
 -------
 
+- Named tuples now work correctly with vars().
+
 - Issue #12085: Fix an attribute error in subprocess.Popen destructor if the
   constructor has failed, e.g. because of an undeclared keyword argument. Patch
   written by Oleg Oshmyan.