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+
+Built-in Constants
+==================
+
+A small number of constants live in the built-in namespace.  They are:
+
+
+.. data:: False
+
+   The false value of the :class:`bool` type.
+
+   .. versionadded:: 2.3
+
+
+.. data:: True
+
+   The true value of the :class:`bool` type.
+
+   .. versionadded:: 2.3
+
+
+.. data:: None
+
+   The sole value of :attr:`types.NoneType`.  ``None`` is frequently used to
+   represent the absence of a value, as when default arguments are not passed to a
+   function.
+
+
+.. data:: NotImplemented
+
+   Special value which can be returned by the "rich comparison" special methods
+   (:meth:`__eq__`, :meth:`__lt__`, and friends), to indicate that the comparison
+   is not implemented with respect to the other type.
+
+
+.. data:: Ellipsis
+
+   The same as ``...``. Special value used mostly in conjunction with extended
+   slicing syntax for user-defined container data types.
+
+   .. % XXX Someone who understands extended slicing should fill in here.
+