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<div class="section" id="module-sysconfig">
<span id="sysconfig-provide-access-to-python-s-configuration-information"></span><h1>27.2. <a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> — Provide access to Python’s configuration information<a class="headerlink" href="#module-sysconfig" title="Permalink to this headline">¶</a></h1>
<p class="versionadded" id="index-0">
<span class="versionmodified">New in version 3.2.</span></p>
<p><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/3.2/Lib/sysconfig.py">Lib/sysconfig.py</a></p>
<hr class="docutils" />
<p>The <a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> module provides access to Python’s configuration
information like the list of installation paths and the configuration variables
relevant for the current platform.</p>
<div class="section" id="configuration-variables">
<h2>27.2.1. Configuration variables<a class="headerlink" href="#configuration-variables" title="Permalink to this headline">¶</a></h2>
<p>A Python distribution contains a <tt class="file docutils literal"><span class="pre">Makefile</span></tt> and a <tt class="file docutils literal"><span class="pre">pyconfig.h</span></tt>
header file that are necessary to build both the Python binary itself and
third-party C extensions compiled using <a class="reference internal" href="distutils.html#module-distutils" title="distutils: Support for building and installing Python modules into an existing Python installation."><tt class="xref py py-mod docutils literal"><span class="pre">distutils</span></tt></a>.</p>
<p><a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> puts all variables found in these files in a dictionary that
can be accessed using <a class="reference internal" href="#sysconfig.get_config_vars" title="sysconfig.get_config_vars"><tt class="xref py py-func docutils literal"><span class="pre">get_config_vars()</span></tt></a> or <a class="reference internal" href="#sysconfig.get_config_var" title="sysconfig.get_config_var"><tt class="xref py py-func docutils literal"><span class="pre">get_config_var()</span></tt></a>.</p>
<p>Notice that on Windows, it’s a much smaller set.</p>
<dl class="function">
<dt id="sysconfig.get_config_vars">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_config_vars</tt><big>(</big><em>*args</em><big>)</big><a class="headerlink" href="#sysconfig.get_config_vars" title="Permalink to this definition">¶</a></dt>
<dd><p>With no arguments, return a dictionary of all configuration variables
relevant for the current platform.</p>
<p>With arguments, return a list of values that result from looking up each
argument in the configuration variable dictionary.</p>
<p>For each argument, if the value is not found, return <tt class="xref docutils literal"><span class="pre">None</span></tt>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_config_var">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_config_var</tt><big>(</big><em>name</em><big>)</big><a class="headerlink" href="#sysconfig.get_config_var" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the value of a single variable <em>name</em>. Equivalent to
<tt class="docutils literal"><span class="pre">get_config_vars().get(name)</span></tt>.</p>
<p>If <em>name</em> is not found, return <tt class="xref docutils literal"><span class="pre">None</span></tt>.</p>
</dd></dl>
<p>Example of usage:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">sysconfig</span>
<span class="gp">>>> </span><span class="n">sysconfig</span><span class="o">.</span><span class="n">get_config_var</span><span class="p">(</span><span class="s">'Py_ENABLE_SHARED'</span><span class="p">)</span>
<span class="go">0</span>
<span class="gp">>>> </span><span class="n">sysconfig</span><span class="o">.</span><span class="n">get_config_var</span><span class="p">(</span><span class="s">'LIBDIR'</span><span class="p">)</span>
<span class="go">'/usr/local/lib'</span>
<span class="gp">>>> </span><span class="n">sysconfig</span><span class="o">.</span><span class="n">get_config_vars</span><span class="p">(</span><span class="s">'AR'</span><span class="p">,</span> <span class="s">'CXX'</span><span class="p">)</span>
<span class="go">['ar', 'g++']</span>
</pre></div>
</div>
</div>
<div class="section" id="installation-paths">
<h2>27.2.2. Installation paths<a class="headerlink" href="#installation-paths" title="Permalink to this headline">¶</a></h2>
<p>Python uses an installation scheme that differs depending on the platform and on
the installation options. These schemes are stored in <a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> under
unique identifiers based on the value returned by <a class="reference internal" href="os.html#os.name" title="os.name"><tt class="xref py py-const docutils literal"><span class="pre">os.name</span></tt></a>.</p>
<p>Every new component that is installed using <a class="reference internal" href="distutils.html#module-distutils" title="distutils: Support for building and installing Python modules into an existing Python installation."><tt class="xref py py-mod docutils literal"><span class="pre">distutils</span></tt></a> or a
Distutils-based system will follow the same scheme to copy its file in the right
places.</p>
<p>Python currently supports seven schemes:</p>
<ul class="simple">
<li><em>posix_prefix</em>: scheme for Posix platforms like Linux or Mac OS X. This is
the default scheme used when Python or a component is installed.</li>
<li><em>posix_home</em>: scheme for Posix platforms used when a <em>home</em> option is used
upon installation. This scheme is used when a component is installed through
Distutils with a specific home prefix.</li>
<li><em>posix_user</em>: scheme for Posix platforms used when a component is installed
through Distutils and the <em>user</em> option is used. This scheme defines paths
located under the user home directory.</li>
<li><em>nt</em>: scheme for NT platforms like Windows.</li>
<li><em>nt_user</em>: scheme for NT platforms, when the <em>user</em> option is used.</li>
<li><em>os2</em>: scheme for OS/2 platforms.</li>
<li><em>os2_home</em>: scheme for OS/2 patforms, when the <em>user</em> option is used.</li>
</ul>
<p>Each scheme is itself composed of a series of paths and each path has a unique
identifier. Python currently uses eight paths:</p>
<ul class="simple">
<li><em>stdlib</em>: directory containing the standard Python library files that are not
platform-specific.</li>
<li><em>platstdlib</em>: directory containing the standard Python library files that are
platform-specific.</li>
<li><em>platlib</em>: directory for site-specific, platform-specific files.</li>
<li><em>purelib</em>: directory for site-specific, non-platform-specific files.</li>
<li><em>include</em>: directory for non-platform-specific header files.</li>
<li><em>platinclude</em>: directory for platform-specific header files.</li>
<li><em>scripts</em>: directory for script files.</li>
<li><em>data</em>: directory for data files.</li>
</ul>
<p><a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> provides some functions to determine these paths.</p>
<dl class="function">
<dt id="sysconfig.get_scheme_names">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_scheme_names</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.get_scheme_names" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a tuple containing all schemes currently supported in
<a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_path_names">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_path_names</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.get_path_names" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a tuple containing all path names currently supported in
<a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_path">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_path</tt><big>(</big><em>name</em><span class="optional">[</span>, <em>scheme</em><span class="optional">[</span>, <em>vars</em><span class="optional">[</span>, <em>expand</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#sysconfig.get_path" title="Permalink to this definition">¶</a></dt>
<dd><p>Return an installation path corresponding to the path <em>name</em>, from the
install scheme named <em>scheme</em>.</p>
<p><em>name</em> has to be a value from the list returned by <a class="reference internal" href="#sysconfig.get_path_names" title="sysconfig.get_path_names"><tt class="xref py py-func docutils literal"><span class="pre">get_path_names()</span></tt></a>.</p>
<p><a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> stores installation paths corresponding to each path name,
for each platform, with variables to be expanded. For instance the <em>stdlib</em>
path for the <em>nt</em> scheme is: <tt class="docutils literal"><span class="pre">{base}/Lib</span></tt>.</p>
<p><a class="reference internal" href="#sysconfig.get_path" title="sysconfig.get_path"><tt class="xref py py-func docutils literal"><span class="pre">get_path()</span></tt></a> will use the variables returned by <a class="reference internal" href="#sysconfig.get_config_vars" title="sysconfig.get_config_vars"><tt class="xref py py-func docutils literal"><span class="pre">get_config_vars()</span></tt></a>
to expand the path. All variables have default values for each platform so
one may call this function and get the default value.</p>
<p>If <em>scheme</em> is provided, it must be a value from the list returned by
<a class="reference internal" href="#sysconfig.get_path_names" title="sysconfig.get_path_names"><tt class="xref py py-func docutils literal"><span class="pre">get_path_names()</span></tt></a>. Otherwise, the default scheme for the current
platform is used.</p>
<p>If <em>vars</em> is provided, it must be a dictionary of variables that will update
the dictionary return by <a class="reference internal" href="#sysconfig.get_config_vars" title="sysconfig.get_config_vars"><tt class="xref py py-func docutils literal"><span class="pre">get_config_vars()</span></tt></a>.</p>
<p>If <em>expand</em> is set to <tt class="xref docutils literal"><span class="pre">False</span></tt>, the path will not be expanded using the
variables.</p>
<p>If <em>name</em> is not found, return <tt class="xref docutils literal"><span class="pre">None</span></tt>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_paths">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_paths</tt><big>(</big><span class="optional">[</span><em>scheme</em><span class="optional">[</span>, <em>vars</em><span class="optional">[</span>, <em>expand</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#sysconfig.get_paths" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a dictionary containing all installation paths corresponding to an
installation scheme. See <a class="reference internal" href="#sysconfig.get_path" title="sysconfig.get_path"><tt class="xref py py-func docutils literal"><span class="pre">get_path()</span></tt></a> for more information.</p>
<p>If <em>scheme</em> is not provided, will use the default scheme for the current
platform.</p>
<p>If <em>vars</em> is provided, it must be a dictionary of variables that will
update the dictionary used to expand the paths.</p>
<p>If <em>expand</em> is set to False, the paths will not be expanded.</p>
<p>If <em>scheme</em> is not an existing scheme, <a class="reference internal" href="#sysconfig.get_paths" title="sysconfig.get_paths"><tt class="xref py py-func docutils literal"><span class="pre">get_paths()</span></tt></a> will raise a
<a class="reference internal" href="exceptions.html#KeyError" title="KeyError"><tt class="xref py py-exc docutils literal"><span class="pre">KeyError</span></tt></a>.</p>
</dd></dl>
</div>
<div class="section" id="other-functions">
<h2>27.2.3. Other functions<a class="headerlink" href="#other-functions" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="sysconfig.get_python_version">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_python_version</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.get_python_version" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the <tt class="docutils literal"><span class="pre">MAJOR.MINOR</span></tt> Python version number as a string. Similar to
<tt class="docutils literal"><span class="pre">sys.version[:3]</span></tt>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_platform">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_platform</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.get_platform" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a string that identifies the current platform.</p>
<p>This is used mainly to distinguish platform-specific build directories and
platform-specific built distributions. Typically includes the OS name and
version and the architecture (as supplied by <a class="reference internal" href="os.html#os.uname" title="os.uname"><tt class="xref py py-func docutils literal"><span class="pre">os.uname()</span></tt></a>), although the
exact information included depends on the OS; e.g. for IRIX the architecture
isn’t particularly important (IRIX only runs on SGI hardware), but for Linux
the kernel version isn’t particularly important.</p>
<p>Examples of returned values:</p>
<ul class="simple">
<li>linux-i586</li>
<li>linux-alpha (?)</li>
<li>solaris-2.6-sun4u</li>
<li>irix-5.3</li>
<li>irix64-6.2</li>
</ul>
<p>Windows will return one of:</p>
<ul class="simple">
<li>win-amd64 (64bit Windows on AMD64 (aka x86_64, Intel64, EM64T, etc)</li>
<li>win-ia64 (64bit Windows on Itanium)</li>
<li>win32 (all others - specifically, sys.platform is returned)</li>
</ul>
<p>Mac OS X can return:</p>
<ul class="simple">
<li>macosx-10.6-ppc</li>
<li>macosx-10.4-ppc64</li>
<li>macosx-10.3-i386</li>
<li>macosx-10.4-fat</li>
</ul>
<p>For other non-POSIX platforms, currently just returns <a class="reference internal" href="sys.html#sys.platform" title="sys.platform"><tt class="xref py py-data docutils literal"><span class="pre">sys.platform</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.is_python_build">
<tt class="descclassname">sysconfig.</tt><tt class="descname">is_python_build</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.is_python_build" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <tt class="xref docutils literal"><span class="pre">True</span></tt> if the current Python installation was built from source.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.parse_config_h">
<tt class="descclassname">sysconfig.</tt><tt class="descname">parse_config_h</tt><big>(</big><em>fp</em><span class="optional">[</span>, <em>vars</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#sysconfig.parse_config_h" title="Permalink to this definition">¶</a></dt>
<dd><p>Parse a <tt class="file docutils literal"><span class="pre">config.h</span></tt>-style file.</p>
<p><em>fp</em> is a file-like object pointing to the <tt class="file docutils literal"><span class="pre">config.h</span></tt>-like file.</p>
<p>A dictionary containing name/value pairs is returned. If an optional
dictionary is passed in as the second argument, it is used instead of a new
dictionary, and updated with the values read in the file.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_config_h_filename">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_config_h_filename</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.get_config_h_filename" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the path of <tt class="file docutils literal"><span class="pre">pyconfig.h</span></tt>.</p>
</dd></dl>
<dl class="function">
<dt id="sysconfig.get_makefile_filename">
<tt class="descclassname">sysconfig.</tt><tt class="descname">get_makefile_filename</tt><big>(</big><big>)</big><a class="headerlink" href="#sysconfig.get_makefile_filename" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the path of <tt class="file docutils literal"><span class="pre">Makefile</span></tt>.</p>
</dd></dl>
</div>
<div class="section" id="using-sysconfig-as-a-script">
<h2>27.2.4. Using <a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> as a script<a class="headerlink" href="#using-sysconfig-as-a-script" title="Permalink to this headline">¶</a></h2>
<p>You can use <a class="reference internal" href="#module-sysconfig" title="sysconfig: Python's configuration information"><tt class="xref py py-mod docutils literal"><span class="pre">sysconfig</span></tt></a> as a script with Python’s <em>-m</em> option:</p>
<div class="highlight-python3"><pre>$ python -m sysconfig
Platform: "macosx-10.4-i386"
Python version: "3.2"
Current installation scheme: "posix_prefix"
Paths:
data = "/usr/local"
include = "/Users/tarek/Dev/svn.python.org/py3k/Include"
platinclude = "."
platlib = "/usr/local/lib/python3.2/site-packages"
platstdlib = "/usr/local/lib/python3.2"
purelib = "/usr/local/lib/python3.2/site-packages"
scripts = "/usr/local/bin"
stdlib = "/usr/local/lib/python3.2"
Variables:
AC_APPLE_UNIVERSAL_BUILD = "0"
AIX_GENUINE_CPLUSPLUS = "0"
AR = "ar"
ARFLAGS = "rc"
ASDLGEN = "./Parser/asdl_c.py"
...</pre>
</div>
<p>This call will print in the standard output the information returned by
<a class="reference internal" href="#sysconfig.get_platform" title="sysconfig.get_platform"><tt class="xref py py-func docutils literal"><span class="pre">get_platform()</span></tt></a>, <a class="reference internal" href="#sysconfig.get_python_version" title="sysconfig.get_python_version"><tt class="xref py py-func docutils literal"><span class="pre">get_python_version()</span></tt></a>, <a class="reference internal" href="#sysconfig.get_path" title="sysconfig.get_path"><tt class="xref py py-func docutils literal"><span class="pre">get_path()</span></tt></a> and
<a class="reference internal" href="#sysconfig.get_config_vars" title="sysconfig.get_config_vars"><tt class="xref py py-func docutils literal"><span class="pre">get_config_vars()</span></tt></a>.</p>
</div>
</div>
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<h3><a href="../contents.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">27.2. <tt class="docutils literal"><span class="pre">sysconfig</span></tt> — Provide access to Python’s configuration information</a><ul>
<li><a class="reference internal" href="#configuration-variables">27.2.1. Configuration variables</a></li>
<li><a class="reference internal" href="#installation-paths">27.2.2. Installation paths</a></li>
<li><a class="reference internal" href="#other-functions">27.2.3. Other functions</a></li>
<li><a class="reference internal" href="#using-sysconfig-as-a-script">27.2.4. Using <tt class="docutils literal"><span class="pre">sysconfig</span></tt> as a script</a></li>
</ul>
</li>
</ul>
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<p class="topless"><a href="sys.html"
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