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  <div class="section" id="module-cgitb">
<span id="cgitb-traceback-manager-for-cgi-scripts"></span><h1>20.3. <a class="reference internal" href="#module-cgitb" title="cgitb: Configurable traceback handler for CGI scripts."><tt class="xref py py-mod docutils literal"><span class="pre">cgitb</span></tt></a> &#8212; Traceback manager for CGI scripts<a class="headerlink" href="#module-cgitb" title="Permalink to this headline">¶</a></h1>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
<p id="index-0">The <a class="reference internal" href="#module-cgitb" title="cgitb: Configurable traceback handler for CGI scripts."><tt class="xref py py-mod docutils literal"><span class="pre">cgitb</span></tt></a> module provides a special exception handler for Python scripts.
(Its name is a bit misleading.  It was originally designed to display extensive
traceback information in HTML for CGI scripts.  It was later generalized to also
display this information in plain text.)  After this module is activated, if an
uncaught exception occurs, a detailed, formatted report will be displayed.  The
report includes a traceback showing excerpts of the source code for each level,
as well as the values of the arguments and local variables to currently running
functions, to help you debug the problem.  Optionally, you can save this
information to a file instead of sending it to the browser.</p>
<p>To enable this feature, simply add this to the top of your CGI script:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">cgitb</span>
<span class="n">cgitb</span><span class="o">.</span><span class="n">enable</span><span class="p">()</span>
</pre></div>
</div>
<p>The options to the <a class="reference internal" href="#cgitb.enable" title="cgitb.enable"><tt class="xref py py-func docutils literal"><span class="pre">enable()</span></tt></a> function control whether the report is
displayed in the browser and whether the report is logged to a file for later
analysis.</p>
<dl class="function">
<dt id="cgitb.enable">
<tt class="descclassname">cgitb.</tt><tt class="descname">enable</tt><big>(</big><span class="optional">[</span><em>display</em><span class="optional">[</span>, <em>logdir</em><span class="optional">[</span>, <em>context</em><span class="optional">[</span>, <em>format</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#cgitb.enable" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-1">This function causes the <a class="reference internal" href="#module-cgitb" title="cgitb: Configurable traceback handler for CGI scripts."><tt class="xref py py-mod docutils literal"><span class="pre">cgitb</span></tt></a> module to take over the interpreter&#8217;s
default handling for exceptions by setting the value of <a class="reference internal" href="sys.html#sys.excepthook" title="sys.excepthook"><tt class="xref py py-attr docutils literal"><span class="pre">sys.excepthook</span></tt></a>.</p>
<p>The optional argument <em>display</em> defaults to <tt class="docutils literal"><span class="pre">1</span></tt> and can be set to <tt class="docutils literal"><span class="pre">0</span></tt> to
suppress sending the traceback to the browser. If the argument <em>logdir</em> is
present, the traceback reports are written to files.  The value of <em>logdir</em>
should be a directory where these files will be placed. The optional argument
<em>context</em> is the number of lines of context to display around the current line
of source code in the traceback; this defaults to <tt class="docutils literal"><span class="pre">5</span></tt>. If the optional
argument <em>format</em> is <tt class="docutils literal"><span class="pre">&quot;html&quot;</span></tt>, the output is formatted as HTML.  Any other
value forces plain text output.  The default value is <tt class="docutils literal"><span class="pre">&quot;html&quot;</span></tt>.</p>
</dd></dl>

<dl class="function">
<dt id="cgitb.handler">
<tt class="descclassname">cgitb.</tt><tt class="descname">handler</tt><big>(</big><span class="optional">[</span><em>info</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#cgitb.handler" title="Permalink to this definition">¶</a></dt>
<dd><p>This function handles an exception using the default settings (that is, show a
report in the browser, but don&#8217;t log to a file). This can be used when you&#8217;ve
caught an exception and want to report it using <a class="reference internal" href="#module-cgitb" title="cgitb: Configurable traceback handler for CGI scripts."><tt class="xref py py-mod docutils literal"><span class="pre">cgitb</span></tt></a>.  The optional
<em>info</em> argument should be a 3-tuple containing an exception type, exception
value, and traceback object, exactly like the tuple returned by
<a class="reference internal" href="sys.html#sys.exc_info" title="sys.exc_info"><tt class="xref py py-func docutils literal"><span class="pre">sys.exc_info()</span></tt></a>.  If the <em>info</em> argument is not supplied, the current
exception is obtained from <a class="reference internal" href="sys.html#sys.exc_info" title="sys.exc_info"><tt class="xref py py-func docutils literal"><span class="pre">sys.exc_info()</span></tt></a>.</p>
</dd></dl>

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