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  65.   <div class="section" id="module-urllib.error">
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  66. <h1>20.8. <tt class="xref docutils literal"><span class="pre">urllib.error</span></tt> &#8212; Exception classes raised by urllib.request<a class="headerlink" href="#module-urllib.error" title="Permalink to this headline"></a></h1>
    67. 

  67. <p>The <tt class="xref docutils literal"><span class="pre">urllib.error</span></tt> module defines the exception classes for exceptions
    68. 

  68. raised by <a title="Next generation URL opening library." class="reference external" href="urllib.request.html#module-urllib.request"><tt class="xref docutils literal"><span class="pre">urllib.request</span></tt></a>.  The base exception class is <a title="urllib.error.URLError" class="reference internal" href="#urllib.error.URLError"><tt class="xref docutils literal"><span class="pre">URLError</span></tt></a>,
    69. 

  69. which inherits from <a title="exceptions.IOError" class="reference external" href="exceptions.html#exceptions.IOError"><tt class="xref docutils literal"><span class="pre">IOError</span></tt></a>.</p>
    70. 

  70. <p>The following exceptions are raised by <tt class="xref docutils literal"><span class="pre">urllib.error</span></tt> as appropriate:</p>
    71. 

  71. <dl class="exception">
    72. 

  72. <dt id="urllib.error.URLError">
    73. 

  73. <em class="property">
    74. 

  74. exception </em><tt class="descclassname">urllib.error.</tt><tt class="descname">URLError</tt><a class="headerlink" href="#urllib.error.URLError" title="Link permanente para esta defini&ccedil;&atilde;o"></a></dt>
    75. 

  75. <dd><p>The handlers raise this exception (or derived exceptions) when they run into
    76. 

  76. a problem.  It is a subclass of <a title="exceptions.IOError" class="reference external" href="exceptions.html#exceptions.IOError"><tt class="xref docutils literal"><span class="pre">IOError</span></tt></a>.</p>
    77. 

  77. <dl class="attribute">
    78. 

  78. <dt id="urllib.error.URLError.reason">
    79. 

  79. <tt class="descname">reason</tt><a class="headerlink" href="#urllib.error.URLError.reason" title="Link permanente para esta defini&ccedil;&atilde;o"></a></dt>
    80. 

  80. <dd>The reason for this error.  It can be a message string or another
    81. 

  81. exception instance (<a title="socket.error" class="reference external" href="socket.html#socket.error"><tt class="xref docutils literal"><span class="pre">socket.error</span></tt></a> for remote URLs, <a title="exceptions.OSError" class="reference external" href="exceptions.html#exceptions.OSError"><tt class="xref docutils literal"><span class="pre">OSError</span></tt></a>
    82. 

  82. for local URLs).</dd></dl>
    83. 

  83. 

  84. </dd></dl>
    85. 

  85. 

  86. <dl class="exception">
    87. 

  87. <dt id="urllib.error.HTTPError">
    88. 

  88. <em class="property">
    89. 

  89. exception </em><tt class="descclassname">urllib.error.</tt><tt class="descname">HTTPError</tt><a class="headerlink" href="#urllib.error.HTTPError" title="Link permanente para esta defini&ccedil;&atilde;o"></a></dt>
    90. 

  90. <dd><p>Though being an exception (a subclass of <a title="urllib.error.URLError" class="reference internal" href="#urllib.error.URLError"><tt class="xref docutils literal"><span class="pre">URLError</span></tt></a>), an
    91. 

  91. <a title="urllib.error.HTTPError" class="reference internal" href="#urllib.error.HTTPError"><tt class="xref docutils literal"><span class="pre">HTTPError</span></tt></a> can also function as a non-exceptional file-like return
    92. 

  92. value (the same thing that <tt class="xref docutils literal"><span class="pre">urlopen()</span></tt> returns).  This is useful when
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  93. handling exotic HTTP errors, such as requests for authentication.</p>
    94. 

  94. <dl class="attribute">
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  95. <dt id="urllib.error.HTTPError.code">
    96. 

  96. <tt class="descname">code</tt><a class="headerlink" href="#urllib.error.HTTPError.code" title="Link permanente para esta defini&ccedil;&atilde;o"></a></dt>
    97. 

  97. <dd>An HTTP status code as defined in <a class="reference external" href="http://www.faqs.org/rfcs/rfc2616.html">RFC 2616</a>.  This numeric value corresponds
    98. 

  98. to a value found in the dictionary of codes as found in
    99. 

  99. <a title="http.server.BaseHTTPRequestHandler.responses" class="reference external" href="http.server.html#http.server.BaseHTTPRequestHandler.responses"><tt class="xref docutils literal"><span class="pre">http.server.BaseHTTPRequestHandler.responses</span></tt></a>.</dd></dl>
    100. 

  100. 

  101. </dd></dl>
    102. 

  102. 

  103. <dl class="exception">
    104. 

  104. <dt id="urllib.error.ContentTooShortError">
    105. 

  105. <em class="property">
    106. 

  106. exception </em><tt class="descclassname">urllib.error.</tt><tt class="descname">ContentTooShortError</tt><big>(</big><em>msg</em><span class="optional">[</span>, <em>content</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#urllib.error.ContentTooShortError" title="Link permanente para esta defini&ccedil;&atilde;o"></a></dt>
    107. 

  107. <dd>This exception is raised when the <tt class="xref docutils literal"><span class="pre">urlretrieve()</span></tt> function detects that
    108. 

  108. the amount of the downloaded data is less than the expected amount (given by
    109. 

  109. the <em>Content-Length</em> header).  The <tt class="xref docutils literal"><span class="pre">content</span></tt> attribute stores the
    110. 

  110. downloaded (and supposedly truncated) data.</dd></dl>
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