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Diffstat (limited to 'Doc/library/constants.rst')
| -rw-r--r-- | Doc/library/constants.rst | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/Doc/library/constants.rst b/Doc/library/constants.rst index f734b5c..51a1c26 100644 --- a/Doc/library/constants.rst +++ b/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`` @@ -40,19 +31,23 @@ A small number of constants live in the built-in namespace. They are: .. data:: Ellipsis - The same as ``...``. Special value used mostly in conjunction with extended - slicing syntax for user-defined container data types, as in :: - - .. XXX Someone who understands extended slicing should fill in here. + The same as ``...``. Special value used mostly in conjunction with extended + slicing syntax for user-defined container data types. .. data:: __debug__ This constant is true if Python was not started with an :option:`-O` option. - 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 ----------------------------------------- |