Small improvement to the implementation of __replace__().

Doc/library/collections.rst

@@ -396,7 +396,7 @@ Example::
                return dict(zip(('x', 'y'), self))
            def __replace__(self, field, value):
                'Return a new Point object replacing specified fields with new values'
-               return Point(**dict(self.__asdict__().items() + kwds.items()))
+               return Point(**dict(zip(('x', 'y'), self) + kwds.items()))
            x = property(itemgetter(0))
            y = property(itemgetter(1))
 

Lib/collections.py

@@ -64,7 +64,7 @@ def namedtuple(typename, field_names, verbose=False):
             return dict(zip(%(field_names)r, self))
         def __replace__(self, **kwds):
             'Return a new %(typename)s object replacing specified fields with new values'
-            return %(typename)s(**dict(self.__asdict__().items() + kwds.items()))  \n''' % locals()
+            return %(typename)s(**dict(zip(%(field_names)r, self) + kwds.items()))  \n''' % locals()
     for i, name in enumerate(field_names):
         template += '        %s = property(itemgetter(%d))\n' % (name, i)
     if verbose: