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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>27.13. site — Site-specific configuration hook — Python v2.6.6 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: '2.6.6', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v2.6.6 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 v2.6.6 documentation" href="../index.html" /> <link rel="up" title="27. Python Runtime Services" href="python.html" /> <link rel="next" title="27.14. user — User-specific configuration hook" href="user.html" /> <link rel="prev" title="27.12. inspect — Inspect live objects" href="inspect.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> </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="../modindex.html" title="Global Module Index" accesskey="M">modules</a> |</li> <li class="right" > <a href="user.html" title="27.14. user — User-specific configuration hook" accesskey="N">next</a> |</li> <li class="right" > <a href="inspect.html" title="27.12. inspect — Inspect live objects" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="python.html" accesskey="U">27. Python Runtime Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-site"> <h1>27.13. <tt class="xref docutils literal"><span class="pre">site</span></tt> — Site-specific configuration hook<a class="headerlink" href="#module-site" title="Permalink to this headline">¶</a></h1> <p><strong>This module is automatically imported during initialization.</strong> The automatic import can be suppressed using the interpreter’s <a class="reference external" href="../using/cmdline.html#cmdoption-S"><em class="xref">-S</em></a> option.</p> <p id="index-550">Importing this module will append site-specific paths to the module search path.</p> <p id="index-551">It starts by constructing up to four directories from a head and a tail part. For the head part, it uses <tt class="docutils literal"><span class="pre">sys.prefix</span></tt> and <tt class="docutils literal"><span class="pre">sys.exec_prefix</span></tt>; empty heads are skipped. For the tail part, it uses the empty string and then <tt class="docutils literal"><span class="pre">lib/site-packages</span></tt> (on Windows) or <tt class="docutils literal"><span class="pre">lib/python|version|/site-packages</span></tt> and then <tt class="docutils literal"><span class="pre">lib/site-python</span></tt> (on Unix and Macintosh). For each of the distinct head-tail combinations, it sees if it refers to an existing directory, and if so, adds it to <tt class="docutils literal"><span class="pre">sys.path</span></tt> and also inspects the newly added path for configuration files.</p> <p>A path configuration file is a file whose name has the form <tt class="docutils literal"><span class="pre">package.pth</span></tt> and exists in one of the four directories mentioned above; its contents are additional items (one per line) to be added to <tt class="docutils literal"><span class="pre">sys.path</span></tt>. Non-existing items are never added to <tt class="docutils literal"><span class="pre">sys.path</span></tt>, but no check is made that the item refers to a directory (rather than a file). No item is added to <tt class="docutils literal"><span class="pre">sys.path</span></tt> more than once. Blank lines and lines beginning with <tt class="docutils literal"><span class="pre">#</span></tt> are skipped. Lines starting with <tt class="docutils literal"><span class="pre">import</span></tt> (followed by space or tab) are executed.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.6: </span>A space or tab is now required after the import keyword.</p> <p id="index-552">For example, suppose <tt class="docutils literal"><span class="pre">sys.prefix</span></tt> and <tt class="docutils literal"><span class="pre">sys.exec_prefix</span></tt> are set to <tt class="docutils literal"><span class="pre">/usr/local</span></tt>. The Python X.Y library is then installed in <tt class="docutils literal"><span class="pre">/usr/local/lib/python</span><em><span class="pre">X.Y</span></em></tt> (where only the first three characters of <tt class="docutils literal"><span class="pre">sys.version</span></tt> are used to form the installation path name). Suppose this has a subdirectory <tt class="docutils literal"><span class="pre">/usr/local/lib/python</span><em><span class="pre">X.Y</span></em><span class="pre">/site-packages</span></tt> with three subsubdirectories, <tt class="docutils literal"><span class="pre">foo</span></tt>, <tt class="docutils literal"><span class="pre">bar</span></tt> and <tt class="docutils literal"><span class="pre">spam</span></tt>, and two path configuration files, <tt class="docutils literal"><span class="pre">foo.pth</span></tt> and <tt class="docutils literal"><span class="pre">bar.pth</span></tt>. Assume <tt class="docutils literal"><span class="pre">foo.pth</span></tt> contains the following:</p> <div class="highlight-python"><div class="highlight"><pre><span class="c"># foo package configuration</span> <span class="n">foo</span> <span class="n">bar</span> <span class="n">bletch</span> </pre></div> </div> <p>and <tt class="docutils literal"><span class="pre">bar.pth</span></tt> contains:</p> <div class="highlight-python"><div class="highlight"><pre><span class="c"># bar package configuration</span> <span class="n">bar</span> </pre></div> </div> <p>Then the following version-specific directories are added to <tt class="docutils literal"><span class="pre">sys.path</span></tt>, in this order:</p> <div class="highlight-python"><pre>/usr/local/lib/pythonX.Y/site-packages/bar /usr/local/lib/pythonX.Y/site-packages/foo</pre> </div> <p>Note that <tt class="docutils literal"><span class="pre">bletch</span></tt> is omitted because it doesn’t exist; the <tt class="docutils literal"><span class="pre">bar</span></tt> directory precedes the <tt class="docutils literal"><span class="pre">foo</span></tt> directory because <tt class="docutils literal"><span class="pre">bar.pth</span></tt> comes alphabetically before <tt class="docutils literal"><span class="pre">foo.pth</span></tt>; and <tt class="docutils literal"><span class="pre">spam</span></tt> is omitted because it is not mentioned in either path configuration file.</p> <p id="index-553">After these path manipulations, an attempt is made to import a module named <tt class="xref docutils literal"><span class="pre">sitecustomize</span></tt>, which can perform arbitrary site-specific customizations. If this import fails with an <a title="exceptions.ImportError" class="reference external" href="exceptions.html#exceptions.ImportError"><tt class="xref docutils literal"><span class="pre">ImportError</span></tt></a> exception, it is silently ignored.</p> <p id="index-554">Note that for some non-Unix systems, <tt class="docutils literal"><span class="pre">sys.prefix</span></tt> and <tt class="docutils literal"><span class="pre">sys.exec_prefix</span></tt> are empty, and the path manipulations are skipped; however the import of <tt class="xref docutils literal"><span class="pre">sitecustomize</span></tt> is still attempted.</p> <dl class="data"> <dt id="site.PREFIXES"> <tt class="descclassname">site.</tt><tt class="descname">PREFIXES</tt><a class="headerlink" href="#site.PREFIXES" title="Permalink to this definition">¶</a></dt> <dd><p>A list of prefixes for site package directories</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="data"> <dt id="site.ENABLE_USER_SITE"> <tt class="descclassname">site.</tt><tt class="descname">ENABLE_USER_SITE</tt><a class="headerlink" href="#site.ENABLE_USER_SITE" title="Permalink to this definition">¶</a></dt> <dd><p>Flag showing the status of the user site directory. True means the user site directory is enabled and added to sys.path. When the flag is None the user site directory is disabled for security reasons.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="data"> <dt id="site.USER_SITE"> <tt class="descclassname">site.</tt><tt class="descname">USER_SITE</tt><a class="headerlink" href="#site.USER_SITE" title="Permalink to this definition">¶</a></dt> <dd><p>Path to the user site directory for the current Python version or None</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="data"> <dt id="site.USER_BASE"> <tt class="descclassname">site.</tt><tt class="descname">USER_BASE</tt><a class="headerlink" href="#site.USER_BASE" title="Permalink to this definition">¶</a></dt> <dd><p>Path to the base directory for user site directories</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="envvar"> <dt id="envvar-PYTHONNOUSERSITE"> <tt class="descname">PYTHONNOUSERSITE</tt><a class="headerlink" href="#envvar-PYTHONNOUSERSITE" title="Permalink to this definition">¶</a></dt> <dd><p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="envvar"> <dt id="envvar-PYTHONUSERBASE"> <tt class="descname">PYTHONUSERBASE</tt><a class="headerlink" href="#envvar-PYTHONUSERBASE" title="Permalink to this definition">¶</a></dt> <dd><p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="function"> <dt id="site.addsitedir"> <tt class="descclassname">site.</tt><tt class="descname">addsitedir</tt><big>(</big><em>sitedir</em>, <em>known_paths=None</em><big>)</big><a class="headerlink" href="#site.addsitedir" title="Permalink to this definition">¶</a></dt> <dd>Adds a directory to sys.path and processes its pth files.</dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="inspect.html" title="previous chapter">27.12. <tt class="docutils literal docutils literal docutils literal"><span class="pre">inspect</span></tt> — Inspect live objects</a></p> <h4>Next topic</h4> <p class="topless"><a href="user.html" title="next chapter">27.14. <tt class="docutils literal docutils literal"><span class="pre">user</span></tt> — User-specific configuration hook</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/site.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="../modindex.html" title="Global Module Index" >modules</a> |</li> <li class="right" > <a href="user.html" title="27.14. user — User-specific configuration hook" >next</a> |</li> <li class="right" > <a href="inspect.html" title="27.12. inspect — Inspect live objects" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="python.html" >27. 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