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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.. _library-index:

###############################
  The Python Standard Library
###############################

While :ref:`reference-index` describes the exact syntax and
semantics of the Python language, this library reference manual
describes the standard library that is distributed with Python. It also
describes some of the optional components that are commonly included
in Python distributions.

Python's standard library is very extensive, offering a wide range of
facilities as indicated by the long table of contents listed below. The
library contains built-in modules (written in C) that provide access to
system functionality such as file I/O that would otherwise be
inaccessible to Python programmers, as well as modules written in Python
that provide standardized solutions for many problems that occur in
everyday programming. Some of these modules are explicitly designed to
encourage and enhance the portability of Python programs by abstracting
away platform-specifics into platform-neutral APIs.

The Python installers for the Windows platform usually include
the entire standard library and often also include many additional
components. For Unix-like operating systems Python is normally provided
as a collection of packages, so it may be necessary to use the packaging
tools provided with the operating system to obtain some or all of the
optional components.

In addition to the standard library, there is a growing collection of
several thousand components (from individual programs and modules to
packages and entire application development frameworks), available from
the `Python Package Index <https://pypi.org>`_.


.. toctree::
   :maxdepth: 2
   :numbered:

   intro.rst
   functions.rst
   constants.rst
   stdtypes.rst
   exceptions.rst

   text.rst
   binary.rst
   datatypes.rst
   numeric.rst
   functional.rst
   filesys.rst
   persistence.rst
   archiving.rst
   fileformats.rst
   crypto.rst
   allos.rst
   concurrency.rst
   ipc.rst
   netdata.rst
   markup.rst
   internet.rst
   mm.rst
   i18n.rst
   frameworks.rst
   tk.rst
   development.rst
   debug.rst
   distribution.rst
   python.rst
   custominterp.rst
   modules.rst
   language.rst
   misc.rst
   windows.rst
   unix.rst
   superseded.rst
   undoc.rst

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