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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>Importing Modules — 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="Utilities" href="utilities.html" /> <link rel="next" title="Data marshalling support" href="marshal.html" /> <link rel="prev" title="Operating System Utilities" href="sys.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="marshal.html" title="Data marshalling support" accesskey="N">next</a> |</li> <li class="right" > <a href="sys.html" title="Operating System Utilities" 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" >Python/C API Reference Manual</a> »</li> <li><a href="utilities.html" accesskey="U">Utilities</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="importing-modules"> <span id="importing"></span><h1>Importing Modules<a class="headerlink" href="#importing-modules" title="Permalink to this headline">¶</a></h1> <dl class="cfunction"> <dt id="PyImport_ImportModule"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ImportModule</tt><big>(</big>const char<em> *name</em><big>)</big><a class="headerlink" href="#PyImport_ImportModule" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-33">This is a simplified interface to <a title="PyImport_ImportModuleEx" class="reference internal" href="#PyImport_ImportModuleEx"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModuleEx()</span></tt></a> below, leaving the <em>globals</em> and <em>locals</em> arguments set to <em>NULL</em> and <em>level</em> set to 0. When the <em>name</em> argument contains a dot (when it specifies a submodule of a package), the <em>fromlist</em> argument is set to the list <tt class="docutils literal"><span class="pre">['*']</span></tt> so that the return value is the named module rather than the top-level package containing it as would otherwise be the case. (Unfortunately, this has an additional side effect when <em>name</em> in fact specifies a subpackage instead of a submodule: the submodules specified in the package’s <tt class="docutils literal"><span class="pre">__all__</span></tt> variable are loaded.) Return a new reference to the imported module, or <em>NULL</em> with an exception set on failure. Before Python 2.4, the module may still be created in the failure case — examine <tt class="docutils literal"><span class="pre">sys.modules</span></tt> to find out. Starting with Python 2.4, a failing import of a module no longer leaves the module in <tt class="docutils literal"><span class="pre">sys.modules</span></tt>.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.4: </span>Failing imports remove incomplete module objects.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.6: </span>Always uses absolute imports.</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ImportModuleNoBlock"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ImportModuleNoBlock</tt><big>(</big>const char<em> *name</em><big>)</big><a class="headerlink" href="#PyImport_ImportModuleNoBlock" title="Permalink to this definition">¶</a></dt> <dd><p>This version of <a title="PyImport_ImportModule" class="reference internal" href="#PyImport_ImportModule"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModule()</span></tt></a> does not block. It’s intended to be used in C functions that import other modules to execute a function. The import may block if another thread holds the import lock. The function <a title="PyImport_ImportModuleNoBlock" class="reference internal" href="#PyImport_ImportModuleNoBlock"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModuleNoBlock()</span></tt></a> never blocks. It first tries to fetch the module from sys.modules and falls back to <a title="PyImport_ImportModule" class="reference internal" href="#PyImport_ImportModule"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModule()</span></tt></a> unless the lock is held, in which case the function will raise an <a title="exceptions.ImportError" class="reference external" href="../library/exceptions.html#exceptions.ImportError"><tt class="xref docutils literal"><span class="pre">ImportError</span></tt></a>.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ImportModuleEx"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ImportModuleEx</tt><big>(</big>char<em> *name</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *globals</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *locals</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *fromlist</em><big>)</big><a class="headerlink" href="#PyImport_ImportModuleEx" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-34">Import a module. This is best described by referring to the built-in Python function <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a>, as the standard <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a> function calls this function directly.</p> <p>The return value is a new reference to the imported module or top-level package, or <em>NULL</em> with an exception set on failure (before Python 2.4, the module may still be created in this case). Like for <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a>, the return value when a submodule of a package was requested is normally the top-level package, unless a non-empty <em>fromlist</em> was given.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.4: </span>Failing imports remove incomplete module objects.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.6: </span>The function is an alias for <a title="PyImport_ImportModuleLevel" class="reference internal" href="#PyImport_ImportModuleLevel"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModuleLevel()</span></tt></a> with -1 as level, meaning relative import.</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ImportModuleLevel"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ImportModuleLevel</tt><big>(</big>char<em> *name</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *globals</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *locals</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *fromlist</em>, int<em> level</em><big>)</big><a class="headerlink" href="#PyImport_ImportModuleLevel" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Import a module. This is best described by referring to the built-in Python function <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a>, as the standard <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a> function calls this function directly.</p> <p>The return value is a new reference to the imported module or top-level package, or <em>NULL</em> with an exception set on failure. Like for <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a>, the return value when a submodule of a package was requested is normally the top-level package, unless a non-empty <em>fromlist</em> was given.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.5.</span></p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_Import"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_Import</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *name</em><big>)</big><a class="headerlink" href="#PyImport_Import" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-35">This is a higher-level interface that calls the current “import hook function”. It invokes the <a title="__import__" class="reference external" href="../library/functions.html#__import__"><tt class="xref docutils literal"><span class="pre">__import__()</span></tt></a> function from the <tt class="docutils literal"><span class="pre">__builtins__</span></tt> of the current globals. This means that the import is done using whatever import hooks are installed in the current environment, e.g. by <a title="Basic restricted execution framework. (deprecated)" class="reference external" href="../library/rexec.html#module-rexec"><tt class="xref docutils literal"><span class="pre">rexec</span></tt></a> or <tt class="xref docutils literal"><span class="pre">ihooks</span></tt>.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.6: </span>Always uses absolute imports.</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ReloadModule"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ReloadModule</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *m</em><big>)</big><a class="headerlink" href="#PyImport_ReloadModule" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-36">Reload a module. This is best described by referring to the built-in Python function <a title="reload" class="reference external" href="../library/functions.html#reload"><tt class="xref docutils literal"><span class="pre">reload()</span></tt></a>, as the standard <a title="reload" class="reference external" href="../library/functions.html#reload"><tt class="xref docutils literal"><span class="pre">reload()</span></tt></a> function calls this function directly. Return a new reference to the reloaded module, or <em>NULL</em> with an exception set on failure (the module still exists in this case).</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_AddModule"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_AddModule</tt><big>(</big>const char<em> *name</em><big>)</big><a class="headerlink" href="#PyImport_AddModule" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: Borrowed reference.</em><p>Return the module object corresponding to a module name. The <em>name</em> argument may be of the form <tt class="docutils literal"><span class="pre">package.module</span></tt>. First check the modules dictionary if there’s one there, and if not, create a new one and insert it in the modules dictionary. Return <em>NULL</em> with an exception set on failure.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">This function does not load or import the module; if the module wasn’t already loaded, you will get an empty module object. Use <a title="PyImport_ImportModule" class="reference internal" href="#PyImport_ImportModule"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModule()</span></tt></a> or one of its variants to import a module. Package structures implied by a dotted name for <em>name</em> are not created if not already present.</p> </div> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ExecCodeModule"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ExecCodeModule</tt><big>(</big>char<em> *name</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *co</em><big>)</big><a class="headerlink" href="#PyImport_ExecCodeModule" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-37">Given a module name (possibly of the form <tt class="docutils literal"><span class="pre">package.module</span></tt>) and a code object read from a Python bytecode file or obtained from the built-in function <a title="compile" class="reference external" href="../library/functions.html#compile"><tt class="xref docutils literal"><span class="pre">compile()</span></tt></a>, load the module. Return a new reference to the module object, or <em>NULL</em> with an exception set if an error occurred. Before Python 2.4, the module could still be created in error cases. Starting with Python 2.4, <em>name</em> is removed from <a title="sys.modules" class="reference external" href="../library/sys.html#sys.modules"><tt class="xref docutils literal"><span class="pre">sys.modules</span></tt></a> in error cases, and even if <em>name</em> was already in <a title="sys.modules" class="reference external" href="../library/sys.html#sys.modules"><tt class="xref docutils literal"><span class="pre">sys.modules</span></tt></a> on entry to <a title="PyImport_ExecCodeModule" class="reference internal" href="#PyImport_ExecCodeModule"><tt class="xref docutils literal"><span class="pre">PyImport_ExecCodeModule()</span></tt></a>. Leaving incompletely initialized modules in <a title="sys.modules" class="reference external" href="../library/sys.html#sys.modules"><tt class="xref docutils literal"><span class="pre">sys.modules</span></tt></a> is dangerous, as imports of such modules have no way to know that the module object is an unknown (and probably damaged with respect to the module author’s intents) state.</p> <p>The module’s <tt class="xref docutils literal"><span class="pre">__file__</span></tt> attribute will be set to the code object’s <tt class="xref docutils literal"><span class="pre">co_filename</span></tt>.</p> <p>This function will reload the module if it was already imported. See <a title="PyImport_ReloadModule" class="reference internal" href="#PyImport_ReloadModule"><tt class="xref docutils literal"><span class="pre">PyImport_ReloadModule()</span></tt></a> for the intended way to reload a module.</p> <p>If <em>name</em> points to a dotted name of the form <tt class="docutils literal"><span class="pre">package.module</span></tt>, any package structures not already created will still not be created.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.4: </span><em>name</em> is removed from <a title="sys.modules" class="reference external" href="../library/sys.html#sys.modules"><tt class="xref docutils literal"><span class="pre">sys.modules</span></tt></a> in error cases.</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ExecCodeModuleEx"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_ExecCodeModuleEx</tt><big>(</big>char<em> *name</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *co</em>, char<em> *pathname</em><big>)</big><a class="headerlink" href="#PyImport_ExecCodeModuleEx" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Like <a title="PyImport_ExecCodeModule" class="reference internal" href="#PyImport_ExecCodeModule"><tt class="xref docutils literal"><span class="pre">PyImport_ExecCodeModule()</span></tt></a>, but the <tt class="xref docutils literal"><span class="pre">__file__</span></tt> attribute of the module object is set to <em>pathname</em> if it is non-<tt class="docutils literal"><span class="pre">NULL</span></tt>.</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_GetMagicNumber"> long <tt class="descname">PyImport_GetMagicNumber</tt><big>(</big><big>)</big><a class="headerlink" href="#PyImport_GetMagicNumber" title="Permalink to this definition">¶</a></dt> <dd>Return the magic number for Python bytecode files (a.k.a. <tt class="docutils literal"><span class="pre">.pyc</span></tt> and <tt class="docutils literal"><span class="pre">.pyo</span></tt> files). The magic number should be present in the first four bytes of the bytecode file, in little-endian byte order.</dd></dl> <dl class="cfunction"> <dt id="PyImport_GetModuleDict"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_GetModuleDict</tt><big>(</big><big>)</big><a class="headerlink" href="#PyImport_GetModuleDict" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: Borrowed reference.</em><p>Return the dictionary used for the module administration (a.k.a. <tt class="docutils literal"><span class="pre">sys.modules</span></tt>). Note that this is a per-interpreter variable.</p> </dd></dl> <dl class="cfunction"> <dt id="PyImport_GetImporter"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyImport_GetImporter</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *path</em><big>)</big><a class="headerlink" href="#PyImport_GetImporter" title="Permalink to this definition">¶</a></dt> <dd><p>Return an importer object for a <a title="sys.path" class="reference external" href="../library/sys.html#sys.path"><tt class="xref docutils literal"><span class="pre">sys.path</span></tt></a>/<tt class="xref docutils literal"><span class="pre">pkg.__path__</span></tt> item <em>path</em>, possibly by fetching it from the <a title="sys.path_importer_cache" class="reference external" href="../library/sys.html#sys.path_importer_cache"><tt class="xref docutils literal"><span class="pre">sys.path_importer_cache</span></tt></a> dict. If it wasn’t yet cached, traverse <a title="sys.path_hooks" class="reference external" href="../library/sys.html#sys.path_hooks"><tt class="xref docutils literal"><span class="pre">sys.path_hooks</span></tt></a> until a hook is found that can handle the path item. Return <tt class="xref docutils literal"><span class="pre">None</span></tt> if no hook could; this tells our caller it should fall back to the built-in import mechanism. Cache the result in <a title="sys.path_importer_cache" class="reference external" href="../library/sys.html#sys.path_importer_cache"><tt class="xref docutils literal"><span class="pre">sys.path_importer_cache</span></tt></a>. Return a new reference to the importer object.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="cfunction"> <dt id="_PyImport_Init"> void <tt class="descname">_PyImport_Init</tt><big>(</big><big>)</big><a class="headerlink" href="#_PyImport_Init" title="Permalink to this definition">¶</a></dt> <dd>Initialize the import mechanism. For internal use only.</dd></dl> <dl class="cfunction"> <dt id="PyImport_Cleanup"> void <tt class="descname">PyImport_Cleanup</tt><big>(</big><big>)</big><a class="headerlink" href="#PyImport_Cleanup" title="Permalink to this definition">¶</a></dt> <dd>Empty the module table. For internal use only.</dd></dl> <dl class="cfunction"> <dt id="_PyImport_Fini"> void <tt class="descname">_PyImport_Fini</tt><big>(</big><big>)</big><a class="headerlink" href="#_PyImport_Fini" title="Permalink to this definition">¶</a></dt> <dd>Finalize the import mechanism. For internal use only.</dd></dl> <dl class="cfunction"> <dt id="_PyImport_FindExtension"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">_PyImport_FindExtension</tt><big>(</big>char<em> *</em>, char<em> *</em><big>)</big><a class="headerlink" href="#_PyImport_FindExtension" title="Permalink to this definition">¶</a></dt> <dd>For internal use only.</dd></dl> <dl class="cfunction"> <dt id="_PyImport_FixupExtension"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">_PyImport_FixupExtension</tt><big>(</big>char<em> *</em>, char<em> *</em><big>)</big><a class="headerlink" href="#_PyImport_FixupExtension" title="Permalink to this definition">¶</a></dt> <dd>For internal use only.</dd></dl> <dl class="cfunction"> <dt id="PyImport_ImportFrozenModule"> int <tt class="descname">PyImport_ImportFrozenModule</tt><big>(</big>char<em> *name</em><big>)</big><a class="headerlink" href="#PyImport_ImportFrozenModule" title="Permalink to this definition">¶</a></dt> <dd>Load a frozen module named <em>name</em>. Return <tt class="docutils literal"><span class="pre">1</span></tt> for success, <tt class="docutils literal"><span class="pre">0</span></tt> if the module is not found, and <tt class="docutils literal"><span class="pre">-1</span></tt> with an exception set if the initialization failed. To access the imported module on a successful load, use <a title="PyImport_ImportModule" class="reference internal" href="#PyImport_ImportModule"><tt class="xref docutils literal"><span class="pre">PyImport_ImportModule()</span></tt></a>. (Note the misnomer — this function would reload the module if it was already imported.)</dd></dl> <dl class="ctype"> <dt id="_frozen"> struct <tt class="descname">_frozen</tt><a class="headerlink" href="#_frozen" title="Permalink to this definition">¶</a></dt> <dd><p id="index-38">This is the structure type definition for frozen module descriptors, as generated by the <strong>freeze</strong> utility (see <tt class="docutils literal"><span class="pre">Tools/freeze/</span></tt> in the Python source distribution). Its definition, found in <tt class="docutils literal"><span class="pre">Include/import.h</span></tt>, is:</p> <div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_frozen</span> <span class="p">{</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">;</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">*</span><span class="n">code</span><span class="p">;</span> <span class="kt">int</span> <span class="n">size</span><span class="p">;</span> <span class="p">};</span> </pre></div> </div> </dd></dl> <dl class="cvar"> <dt id="PyImport_FrozenModules"> struct <a title="_frozen" class="reference internal" href="#_frozen">_frozen</a>* <tt class="descname">PyImport_FrozenModules</tt><a class="headerlink" href="#PyImport_FrozenModules" title="Permalink to this definition">¶</a></dt> <dd>This pointer is initialized to point to an array of <tt class="xref docutils literal"><span class="pre">struct</span> <span class="pre">_frozen</span></tt> records, terminated by one whose members are all <em>NULL</em> or zero. When a frozen module is imported, it is searched in this table. Third-party code could play tricks with this to provide a dynamically created collection of frozen modules.</dd></dl> <dl class="cfunction"> <dt id="PyImport_AppendInittab"> int <tt class="descname">PyImport_AppendInittab</tt><big>(</big>char<em> *name</em>, void<em> (*initfunc)(void)</em><big>)</big><a class="headerlink" href="#PyImport_AppendInittab" title="Permalink to this definition">¶</a></dt> <dd>Add a single module to the existing table of built-in modules. This is a convenience wrapper around <a title="PyImport_ExtendInittab" class="reference internal" href="#PyImport_ExtendInittab"><tt class="xref docutils literal"><span class="pre">PyImport_ExtendInittab()</span></tt></a>, returning <tt class="docutils literal"><span class="pre">-1</span></tt> if the table could not be extended. The new module can be imported by the name <em>name</em>, and uses the function <em>initfunc</em> as the initialization function called on the first attempted import. This should be called before <a title="Py_Initialize" class="reference external" href="init.html#Py_Initialize"><tt class="xref docutils literal"><span class="pre">Py_Initialize()</span></tt></a>.</dd></dl> <dl class="ctype"> <dt id="_inittab"> struct <tt class="descname">_inittab</tt><a class="headerlink" href="#_inittab" title="Permalink to this definition">¶</a></dt> <dd><p>Structure describing a single entry in the list of built-in modules. Each of these structures gives the name and initialization function for a module built into the interpreter. Programs which embed Python may use an array of these structures in conjunction with <a title="PyImport_ExtendInittab" class="reference internal" href="#PyImport_ExtendInittab"><tt class="xref docutils literal"><span class="pre">PyImport_ExtendInittab()</span></tt></a> to provide additional built-in modules. The structure is defined in <tt class="docutils literal"><span class="pre">Include/import.h</span></tt> as:</p> <div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_inittab</span> <span class="p">{</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">;</span> <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">initfunc</span><span class="p">)(</span><span class="kt">void</span><span class="p">);</span> <span class="p">};</span> </pre></div> </div> </dd></dl> <dl class="cfunction"> <dt id="PyImport_ExtendInittab"> int <tt class="descname">PyImport_ExtendInittab</tt><big>(</big>struct <a title="_inittab" class="reference internal" href="#_inittab">_inittab</a><em> *newtab</em><big>)</big><a class="headerlink" href="#PyImport_ExtendInittab" title="Permalink to this definition">¶</a></dt> <dd>Add a collection of modules to the table of built-in modules. The <em>newtab</em> array must end with a sentinel entry which contains <em>NULL</em> for the <tt class="xref docutils literal"><span class="pre">name</span></tt> field; failure to provide the sentinel value can result in a memory fault. Returns <tt class="docutils literal"><span class="pre">0</span></tt> on success or <tt class="docutils literal"><span class="pre">-1</span></tt> if insufficient memory could be allocated to extend the internal table. In the event of failure, no modules are added to the internal table. This should be called before <a title="Py_Initialize" class="reference external" href="init.html#Py_Initialize"><tt class="xref docutils literal"><span class="pre">Py_Initialize()</span></tt></a>.</dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="sys.html" title="previous chapter">Operating System Utilities</a></p> <h4>Next topic</h4> <p class="topless"><a href="marshal.html" title="next chapter">Data marshalling support</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/c-api/import.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="marshal.html" title="Data marshalling support" >next</a> |</li> <li class="right" > <a href="sys.html" title="Operating System Utilities" >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" >Python/C API Reference Manual</a> »</li> <li><a href="utilities.html" >Utilities</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2011, 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 20, 2011. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 0.6.6. </div> </body> </html>
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