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:`dircache` --- Cached directory listings
=============================================

.. module:: dircache
   :synopsis: Return directory listing, with cache mechanism.
   :deprecated:

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


.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>


The :mod:`dircache` module defines a function for reading directory listing
using a cache, and cache invalidation using the *mtime* of the directory.
Additionally, it defines a function to annotate directories by appending a
slash.

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


.. function:: reset()

   Resets the directory cache.


.. function:: listdir(path)

   Return a directory listing of *path*, as gotten from :func:`os.listdir`. Note
   that unless *path* changes, further call to :func:`listdir` will not re-read the
   directory structure.

   Note that the list returned should be regarded as read-only. (Perhaps a future
   version should change it to return a tuple?)


.. function:: opendir(path)

   Same as :func:`listdir`. Defined for backwards compatibility.


.. function:: annotate(head, list)

   Assume *list* is a list of paths relative to *head*, and append, in place, a
   ``'/'`` to each path which points to a directory.

::

   >>> import dircache
   >>> a = dircache.listdir('/')
   >>> a = a[:] # Copy the return value so we can change 'a'
   >>> a
   ['bin', 'boot', 'cdrom', 'dev', 'etc', 'floppy', 'home', 'initrd', 'lib', 'lost+
   found', 'mnt', 'proc', 'root', 'sbin', 'tmp', 'usr', 'var', 'vmlinuz']
   >>> dircache.annotate('/', a)
   >>> a
   ['bin/', 'boot/', 'cdrom/', 'dev/', 'etc/', 'floppy/', 'home/', 'initrd/', 'lib/
   ', 'lost+found/', 'mnt/', 'proc/', 'root/', 'sbin/', 'tmp/', 'usr/', 'var/', 'vm
   linuz']

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