diff -r ffa851df0825 -r 2fb8b9db1c86 symbian-qemu-0.9.1-12/python-2.6.1/Doc/library/constants.rst --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/symbian-qemu-0.9.1-12/python-2.6.1/Doc/library/constants.rst Fri Jul 31 15:01:17 2009 +0100 @@ -0,0 +1,73 @@ +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. + + .. versionchanged:: 2.4 + Assignments to ``None`` are illegal and raise a :exc:`SyntaxError`. + + +.. 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 + + Special value used in conjunction with extended slicing syntax. + + .. XXX Someone who understands extended slicing should fill in here. + + +.. 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. + + +Constants added by the :mod:`site` module +----------------------------------------- + +The :mod:`site` module (which is imported automatically during startup, except +if the :option:`-S` command-line option is given) adds several constants to the +built-in namespace. They are useful for the interactive interpreter shell and +should not be used in programs. + +.. data:: quit([code=None]) + exit([code=None]) + + Objects that when printed, print a message like "Use quit() or Ctrl-D + (i.e. EOF) to exit", and when called, raise :exc:`SystemExit` with the + specified exit code, and when . + +.. data:: copyright + license + credits + + Objects that when printed, print a message like "Type license() to see the + full license text", and when called, display the corresponding text in a + pager-like fashion (one screen at a time).