Fix named tuples to work with vars().

Doc/library/collections.rst

@@ -622,6 +622,8 @@ Example:
            def _asdict(self):
                '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'

Lib/collections.py

@@ -312,6 +312,7 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
         def _asdict(self):
             'Return a new OrderedDict which maps field names to their values'
             return OrderedDict(zip(self._fields, self)) \n
+        __dict__ = property(_asdict) \n
         def _replace(_self, **kwds):
             'Return a new %(typename)s object replacing specified fields with new values'
             result = _self._make(map(kwds.pop, %(field_names)r, _self))

Lib/test/test_collections.py

@@ -78,12 +78,12 @@ 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)

Misc/NEWS

@@ -16,6 +16,8 @@ Core and Builtins
 Library
 -------
 
+- Named tuples now work correctly with vars().
+
 - sys.setcheckinterval() now updates the current ticker count as well as updating
   the check interval, so if the user decreases the check interval, the ticker
   doesn't have to wind down to zero from the old starting point before the new