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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="Content-Type" content="text/html; charset=utf-8" /> <title>26. Debugging and Profiling — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', 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 2.7.5 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 2.7.5 documentation" href="../index.html" /> <link rel="up" title="The Python Standard Library" href="index.html" /> <link rel="next" title="26.1. bdb — Debugger framework" href="bdb.html" /> <link rel="prev" title="25.5. test — Regression tests package for Python" href="test.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="26.1. bdb — Debugger framework" accesskey="N">next</a> |</li> <li class="right" > <a href="test.html" title="25.5. test — Regression tests package for Python" 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">Python 2.7.5 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>26. 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">26.1. <tt class="docutils literal"><span class="pre">bdb</span></tt> — Debugger framework</a></li> <li class="toctree-l1"><a class="reference internal" href="pdb.html">26.2. <tt class="docutils literal"><span class="pre">pdb</span></tt> — The Python Debugger</a></li> <li class="toctree-l1"><a class="reference internal" href="pdb.html#debugger-commands">26.3. Debugger Commands</a></li> <li class="toctree-l1"><a class="reference internal" href="profile.html">26.4. The Python Profilers</a><ul> <li class="toctree-l2"><a class="reference internal" href="profile.html#introduction-to-the-profilers">26.4.1. Introduction to the profilers</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#instant-user-s-manual">26.4.2. Instant User’s Manual</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#module-cProfile">26.4.3. <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">26.4.4. 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">26.4.5. What Is Deterministic Profiling?</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#limitations">26.4.6. Limitations</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#calibration">26.4.7. Calibration</a></li> <li class="toctree-l2"><a class="reference internal" href="profile.html#using-a-customer-timer">26.4.8. Using a customer timer</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="hotshot.html">26.5. <tt class="docutils literal"><span class="pre">hotshot</span></tt> — High performance logging profiler</a><ul> <li class="toctree-l2"><a class="reference internal" href="hotshot.html#profile-objects">26.5.1. Profile Objects</a></li> <li class="toctree-l2"><a class="reference internal" href="hotshot.html#module-hotshot.stats">26.5.2. Using hotshot data</a></li> <li class="toctree-l2"><a class="reference internal" href="hotshot.html#example-usage">26.5.3. Example Usage</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="timeit.html">26.6. <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">26.6.1. Basic Examples</a></li> <li class="toctree-l2"><a class="reference internal" href="timeit.html#python-interface">26.6.2. Python Interface</a></li> <li class="toctree-l2"><a class="reference internal" href="timeit.html#command-line-interface">26.6.3. Command-Line Interface</a></li> <li class="toctree-l2"><a class="reference internal" href="timeit.html#examples">26.6.4. Examples</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="trace.html">26.7. <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">26.7.1. Command-Line Usage</a><ul> <li class="toctree-l3"><a class="reference internal" href="trace.html#main-options">26.7.1.1. Main options</a></li> <li class="toctree-l3"><a class="reference internal" href="trace.html#modifiers">26.7.1.2. Modifiers</a></li> <li class="toctree-l3"><a class="reference internal" href="trace.html#filters">26.7.1.3. Filters</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="trace.html#programmatic-interface">26.7.2. 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="test.html" title="previous chapter">25.5. <tt class="docutils literal"><span class="pre">test</span></tt> — Regression tests package for Python</a></p> <h4>Next topic</h4> <p class="topless"><a href="bdb.html" title="next chapter">26.1. <tt class="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" /> <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="26.1. bdb — Debugger framework" >next</a> |</li> <li class="right" > <a href="test.html" title="25.5. test — Regression tests package for Python" >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">Python 2.7.5 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> 1990-2019, 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 Jul 03, 2019. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3. </div> </body> </html>