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

This commit is contained in:
Georg Brandl 2010-08-02 19:36:36 +00:00
parent 9499bb76a3
commit c589a70e17
1 changed files with 6 additions and 9 deletions
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15
Doc/library/constants.rst
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@ -3,15 +3,6 @@ Built-in Constants
A small number of constants live in the built-in namespace. They are: 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 .. data:: False
The false value of the :class:`bool` type. Assignments to ``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`. Assignments to :const:`__debug__` are illegal and raise a :exc:`SyntaxError`.
See also the :keyword:`assert` statement. 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 Constants added by the :mod:`site` module
----------------------------------------- -----------------------------------------