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Debugging and Profiling — Python v3.3.2 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '3.3.2', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </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/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v3.3.2 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python v3.3.2 documentation" href="../index.html" /> <link rel="up" title="The Python Standard Library" href="index.html" /> <link rel="next" title="27.1. bdb — Debugger framework" href="bdb.html" /> <link rel="prev" title="26.9. venv — Creation of virtual environments" href="venv.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head> <body> <div class="related"> <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="bdb.html" title="27.1. bdb — Debugger framework" accesskey="N">next</a> |</li> <li class="right" > <a href="venv.html" title="26.9. venv — Creation of virtual environments" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.3.2 Documentation</a> » </li> <li><a href="index.html" accesskey="U">The Python Standard Library</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="debugging-and-profiling"> <h1>27. Debugging and Profiling<a class="headerlink" href="#debugging-and-profiling" title="Permalink to this headline">¶</a></h1> <p>These libraries help you with Python development: the debugger enables you to step through code, analyze stack frames and set breakpoints etc., and the profilers run code and give you a detailed breakdown of execution times, allowing you to identify bottlenecks in your programs.</p> <div class="toctree-wrapper compound"> <ul> <li class="toctree-l1"><a class="reference internal" href="bdb.html">27.1. <tt class="docutils literal"><span class="pre">bdb</span></tt> — Debugger framework</a></li> <li class="toctree-l1"><a class="reference internal" href="faulthandler.html">27.2. <tt class="docutils literal"><span class="pre">faulthandler</span></tt> — Dump the Python traceback</a><ul> <li class="toctree-l2"><a class="reference internal" href="faulthandler.html#dump-the-traceback">27.2.1. Dump the traceback</a></li> <li class="toctree-l2"><a class="reference internal" href="faulthandler.html#fault-handler-state">27.2.2. Fault handler state</a></li> <li class="toctree-l2"><a class="reference internal" href="faulthandler.html#dump-the-tracebacks-after-a-timeout">27.2.3. Dump the tracebacks after a timeout</a></li> <li class="toctree-l2"><a class="reference internal" href="faulthandler.html#dump-the-traceback-on-a-user-signal">27.2.4. Dump the traceback on a user signal</a></li> <li class="toctree-l2"><a class="reference internal" href="faulthandler.html#file-descriptor-issue">27.2.5. File descriptor issue</a></li> <li class="toctree-l2"><a class="reference internal" href="faulthandler.html#example">27.2.6. Example</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="pdb.html">27.3. <tt class="docutils literal"><span class="pre">pdb</span></tt> — The Python Debugger</a><ul> <li class="toctree-l2"><a class="reference internal" href="pdb.html#debugger-commands">27.3.1. Debugger Commands</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="profile.html">27.4. The Python Profilers</a><ul> <li class="toctree-l2"><a class="reference internal" href="profile.html#introduction-to-the-profilers">27.4.1. Introduction to the profilers</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#instant-user-s-manual">27.4.2. Instant User’s Manual</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#module-cProfile">27.4.3. <tt class="docutils literal"><span class="pre">profile</span></tt> and <tt class="docutils literal"><span class="pre">cProfile</span></tt> Module Reference</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#the-stats-class">27.4.4. The <tt class="docutils literal"><span class="pre">Stats</span></tt> Class</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#what-is-deterministic-profiling">27.4.5. What Is Deterministic Profiling?</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#limitations">27.4.6. Limitations</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#calibration">27.4.7. Calibration</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#using-a-customer-timer">27.4.8. Using a customer timer</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="timeit.html">27.5. <tt class="docutils literal"><span class="pre">timeit</span></tt> — Measure execution time of small code snippets</a><ul> <li class="toctree-l2"><a class="reference internal" href="timeit.html#basic-examples">27.5.1. Basic Examples</a></li> <li class="toctree-l2"><a class="reference internal" href="timeit.html#python-interface">27.5.2. Python Interface</a></li> <li class="toctree-l2"><a class="reference internal" href="timeit.html#command-line-interface">27.5.3. Command-Line Interface</a></li> <li class="toctree-l2"><a class="reference internal" href="timeit.html#examples">27.5.4. Examples</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="trace.html">27.6. <tt class="docutils literal"><span class="pre">trace</span></tt> — Trace or track Python statement execution</a><ul> <li class="toctree-l2"><a class="reference internal" href="trace.html#command-line-usage">27.6.1. Command-Line Usage</a><ul> <li class="toctree-l3"><a class="reference internal" href="trace.html#main-options">27.6.1.1. Main options</a></li> <li class="toctree-l3"><a class="reference internal" href="trace.html#modifiers">27.6.1.2. Modifiers</a></li> <li class="toctree-l3"><a class="reference internal" href="trace.html#filters">27.6.1.3. Filters</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="trace.html#programmatic-interface">27.6.2. Programmatic Interface</a></li> </ul> </li> </ul> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="venv.html" title="previous chapter">26.9. <tt class="docutils literal"><span class="pre">venv</span></tt> — Creation of virtual environments</a></p> <h4>Next topic</h4> <p class="topless"><a href="bdb.html" title="next chapter">27.1. <tt class="docutils literal docutils literal"><span class="pre">bdb</span></tt> — Debugger framework</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/debug.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <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="bdb.html" title="27.1. bdb — Debugger framework" >next</a> |</li> <li class="right" > <a href="venv.html" title="26.9. venv — Creation of virtual environments" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.3.2 Documentation</a> » </li> <li><a href="index.html" >The Python Standard Library</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2013, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="http://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on May 15, 2013. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.7. </div> </body> </html>