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<div class="section" id="module-site">
<h1>27.12. <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-479">Importing this module will append site-specific paths to the module search path.</p>
<p id="index-480">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 id="index-481">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-python3"><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-python3"><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-python3"><div class="highlight"><pre><span class="o">/</span><span class="n">usr</span><span class="o">/</span><span class="n">local</span><span class="o">/</span><span class="n">lib</span><span class="o">/</span><span class="n">pythonX</span><span class="o">.</span><span class="n">Y</span><span class="o">/</span><span class="n">site</span><span class="o">-</span><span class="n">packages</span><span class="o">/</span><span class="n">bar</span>
<span class="o">/</span><span class="n">usr</span><span class="o">/</span><span class="n">local</span><span class="o">/</span><span class="n">lib</span><span class="o">/</span><span class="n">pythonX</span><span class="o">.</span><span class="n">Y</span><span class="o">/</span><span class="n">site</span><span class="o">-</span><span class="n">packages</span><span class="o">/</span><span class="n">foo</span>
</pre></div>
</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-482">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-483">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>A list of prefixes for site package directories</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>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.</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>Path to the user site directory for the current Python version or None</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>Path to the base directory for user site directories</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></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></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>
<p>XXX Update documentation
XXX document python -m site –user-base –user-site</p>
</div>
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