晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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:mod:`Bastion` --- Restricting access to objects
================================================

.. module:: Bastion
   :synopsis: Providing restricted access to objects.
   :deprecated:

.. deprecated:: 2.6
   The :mod:`Bastion` module has been removed in Python 3.

.. moduleauthor:: Barry Warsaw <bwarsaw@python.org>


.. versionchanged:: 2.3
   Disabled module.

.. note::

   The documentation has been left in place to help in reading old code that uses
   the module.

According to the dictionary, a bastion is "a fortified area or position", or
"something that is considered a stronghold."  It's a suitable name for this
module, which provides a way to forbid access to certain attributes of an
object.  It must always be used with the :mod:`rexec` module, in order to allow
restricted-mode programs access to certain safe attributes of an object, while
denying access to other, unsafe attributes.

.. I'm concerned that the word 'bastion' won't be understood by people
.. for whom English is a second language, making the module name
.. somewhat mysterious.  Thus, the brief definition... --amk

.. I've punted on the issue of documenting keyword arguments for now.


.. function:: Bastion(object[, filter[, name[, class]]])

   Protect the object *object*, returning a bastion for the object.  Any attempt to
   access one of the object's attributes will have to be approved by the *filter*
   function; if the access is denied an :exc:`AttributeError` exception will be
   raised.

   If present, *filter* must be a function that accepts a string containing an
   attribute name, and returns true if access to that attribute will be permitted;
   if *filter* returns false, the access is denied.  The default filter denies
   access to any function beginning with an underscore (``'_'``).  The bastion's
   string representation will be ``<Bastion for name>`` if a value for *name* is
   provided; otherwise, ``repr(object)`` will be used.

   *class*, if present, should be a subclass of :class:`BastionClass`;  see the
   code in :file:`bastion.py` for the details.  Overriding the default
   :class:`BastionClass` will rarely be required.


.. class:: BastionClass(getfunc, name)

   Class which actually implements bastion objects.  This is the default class used
   by :func:`Bastion`.  The *getfunc* parameter is a function which returns the
   value of an attribute which should be exposed to the restricted execution
   environment when called with the name of the attribute as the only parameter.
   *name* is used to construct the :func:`repr` of the :class:`BastionClass`
   instance.

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