#9438: clarify that constant names also cannot be assigned as attributes.

Doc/library/constants.rst

@@ -3,15 +3,6 @@ Built-in Constants
 
 A small number of constants live in the built-in namespace.  They are:
 
-
-.. note::
-
-   :data:`None`, :data:`False`, :data:`True` and :data:`__debug__` cannot be
-   reassigned (assignments to them raise :exc:`SyntaxError`), so they can be
-   considered "true" constants.
-
-.. XXX False, True, None are keywords too
-
 .. data:: False
 
    The false value of the :class:`bool` type. Assignments to ``False``
@@ -50,6 +41,12 @@ A small number of constants live in the built-in namespace.  They are:
    Assignments to :const:`__debug__` are illegal and raise a :exc:`SyntaxError`.
    See also the :keyword:`assert` statement.
 
+.. note::
+
+   The names :data:`None`, :data:`False`, :data:`True` and :data:`__debug__`
+   cannot be reassigned (assignments to them, even as an attribute name, raise
+   :exc:`SyntaxError`), so they can be considered "true" constants.
+
 
 Constants added by the :mod:`site` module
 -----------------------------------------