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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>20.3. cgitb — Traceback manager for CGI scripts — Python 2.7.18 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/language_data.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.18 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="20.4. wsgiref — WSGI Utilities and Reference Implementation" href="wsgiref.html" /> <link rel="prev" title="20.2. cgi — Common Gateway Interface support" href="cgi.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="file:///usr/share/doc/python2.7/html/library/cgitb.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;"> This document is for an old version of Python that is <a href="https://devguide.python.org/devcycle/#end-of-life-branches">no longer supported</a>. You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/library/cgitb.html"> Python documentation for the Python3 version packaged in this release</a>. </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="wsgiref.html" title="20.4. wsgiref — WSGI Utilities and Reference Implementation" accesskey="N">next</a> |</li> <li class="right" > <a href="cgi.html" title="20.2. cgi — Common Gateway Interface support" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="internet.html" accesskey="U">20. Internet Protocols and Support</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <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."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cgitb</span></code></a> — Traceback manager for CGI scripts<a class="headerlink" href="#module-cgitb" title="Permalink to this headline">¶</a></h1> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> <p id="index-0">The <a class="reference internal" href="#module-cgitb" title="cgitb: Configurable traceback handler for CGI scripts."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cgitb</span></code></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-default notranslate"><div class="highlight"><pre><span></span><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"><code class="xref py py-func docutils literal notranslate"><span class="pre">enable()</span></code></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"> <code class="descclassname">cgitb.</code><code class="descname">enable</code><span class="sig-paren">(</span><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><span class="sig-paren">)</span><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."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cgitb</span></code></a> module to take over the interpreter’s default handling for exceptions by setting the value of <a class="reference internal" href="sys.html#sys.excepthook" title="sys.excepthook"><code class="xref py py-attr docutils literal notranslate"><span class="pre">sys.excepthook</span></code></a>.</p> <p>The optional argument <em>display</em> defaults to <code class="docutils literal notranslate"><span class="pre">1</span></code> and can be set to <code class="docutils literal notranslate"><span class="pre">0</span></code> 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 <code class="docutils literal notranslate"><span class="pre">5</span></code>. If the optional argument <em>format</em> is <code class="docutils literal notranslate"><span class="pre">"html"</span></code>, the output is formatted as HTML. Any other value forces plain text output. The default value is <code class="docutils literal notranslate"><span class="pre">"html"</span></code>.</p> </dd></dl> <dl class="function"> <dt id="cgitb.handler"> <code class="descclassname">cgitb.</code><code class="descname">handler</code><span class="sig-paren">(</span><span class="optional">[</span><em>info</em><span class="optional">]</span><span class="sig-paren">)</span><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’t log to a file). This can be used when you’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."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cgitb</span></code></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"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exc_info()</span></code></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"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exc_info()</span></code></a>.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="cgi.html" title="previous chapter">20.2. <code class="docutils literal notranslate"><span class="pre">cgi</span></code> — Common Gateway Interface support</a></p> <h4>Next topic</h4> <p class="topless"><a href="wsgiref.html" title="next chapter">20.4. <code class="docutils literal notranslate"><span class="pre">wsgiref</span></code> — WSGI Utilities and Reference Implementation</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/cgitb.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="wsgiref.html" title="20.4. wsgiref — WSGI Utilities and Reference Implementation" >next</a> |</li> <li class="right" > <a href="cgi.html" title="20.2. cgi — Common Gateway Interface support" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="internet.html" >20. 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