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:`urllib.error` --- Exception classes raised by urllib.request
==================================================================

.. module:: urllib.error
   :synopsis: Exception classes raised by urllib.request.

.. moduleauthor:: Jeremy Hylton <jeremy@alum.mit.edu>
.. sectionauthor:: Senthil Kumaran <orsenthil@gmail.com>

**Source code:** :source:`Lib/urllib/error.py`

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

The :mod:`urllib.error` module defines the exception classes for exceptions
raised by :mod:`urllib.request`.  The base exception class is :exc:`URLError`.

The following exceptions are raised by :mod:`urllib.error` as appropriate:

.. exception:: URLError

   The handlers raise this exception (or derived exceptions) when they run into
   a problem.  It is a subclass of :exc:`OSError`.

   .. attribute:: reason

      The reason for this error.  It can be a message string or another
      exception instance.

   .. versionchanged:: 3.3
      :exc:`URLError` has been made a subclass of :exc:`OSError` instead
      of :exc:`IOError`.


.. exception:: HTTPError

   Though being an exception (a subclass of :exc:`URLError`), an
   :exc:`HTTPError` can also function as a non-exceptional file-like return
   value (the same thing that :func:`~urllib.request.urlopen` returns).  This
   is useful when handling exotic HTTP errors, such as requests for
   authentication.

   .. attribute:: code

      An HTTP status code as defined in :rfc:`2616`.  This numeric value corresponds
      to a value found in the dictionary of codes as found in
      :attr:`http.server.BaseHTTPRequestHandler.responses`.

   .. attribute:: reason

      This is usually a string explaining the reason for this error.

   .. attribute:: headers

      The HTTP response headers for the HTTP request that caused the
      :exc:`HTTPError`.

      .. versionadded:: 3.4

.. exception:: ContentTooShortError(msg, content)

   This exception is raised when the :func:`~urllib.request.urlretrieve`
   function detects that
   the amount of the downloaded data is less than the expected amount (given by
   the *Content-Length* header).  The :attr:`content` attribute stores the
   downloaded (and supposedly truncated) data.

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