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:`linecache` --- Random access to text lines
================================================

.. module:: linecache
   :synopsis: This module provides random access to individual lines from text files.
.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>

**Source code:** :source:`Lib/linecache.py`

--------------

The :mod:`linecache` module allows one to get any line from any file, while
attempting to optimize internally, using a cache, the common case where many
lines are read from a single file.  This is used by the :mod:`traceback` module
to retrieve source lines for inclusion in  the formatted traceback.

The :mod:`linecache` module defines the following functions:


.. function:: getline(filename, lineno[, module_globals])

   Get line *lineno* from file named *filename*. This function will never raise an
   exception --- it will return ``''`` on errors (the terminating newline character
   will be included for lines that are found).

   .. index:: triple: module; search; path

   If a file named *filename* is not found, the function will look for it in the
   module search path, ``sys.path``, after first checking for a :pep:`302`
   ``__loader__`` in *module_globals*, in case the module was imported from a
   zipfile or other non-filesystem import source.

   .. versionadded:: 2.5
      The *module_globals* parameter was added.


.. function:: clearcache()

   Clear the cache.  Use this function if you no longer need lines from files
   previously read using :func:`getline`.


.. function:: checkcache([filename])

   Check the cache for validity.  Use this function if files in the cache  may have
   changed on disk, and you require the updated version.  If *filename* is omitted,
   it will check all the entries in the cache.

Example::

   >>> import linecache
   >>> linecache.getline('/etc/passwd', 4)
   'sys:x:3:3:sys:/dev:/bin/sh\n'

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