Edit File: class.html
<!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>Class and Instance Objects — 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="Concrete Objects Layer" href="concrete.html" /> <link rel="next" title="Function Objects" href="function.html" /> <link rel="prev" title="Dictionary Objects" href="dict.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="function.html" title="Function Objects" accesskey="N">next</a> |</li> <li class="right" > <a href="dict.html" title="Dictionary Objects" 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" >Python/C API Reference Manual</a> »</li> <li><a href="concrete.html" accesskey="U">Concrete Objects Layer</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="class-and-instance-objects"> <span id="classobjects"></span><h1>Class and Instance Objects<a class="headerlink" href="#class-and-instance-objects" title="Permalink to this headline">¶</a></h1> <p id="index-0">Note that the class objects described here represent old-style classes, which will go away in Python 3. When creating new types for extension modules, you will want to work with type objects (section <a class="reference internal" href="type.html#typeobjects"><em>Type Objects</em></a>).</p> <dl class="type"> <dt id="PyClassObject"> <tt class="descname">PyClassObject</tt><a class="headerlink" href="#PyClassObject" title="Permalink to this definition">¶</a></dt> <dd><p>The C structure of the objects used to describe built-in classes.</p> </dd></dl> <dl class="var"> <dt id="PyClass_Type"> <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyClass_Type</tt><a class="headerlink" href="#PyClass_Type" title="Permalink to this definition">¶</a></dt> <dd><p id="index-1">This is the type object for class objects; it is the same object as <tt class="docutils literal"><span class="pre">types.ClassType</span></tt> in the Python layer.</p> </dd></dl> <dl class="function"> <dt id="PyClass_Check"> int <tt class="descname">PyClass_Check</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#PyClass_Check" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if the object <em>o</em> is a class object, including instances of types derived from the standard class object. Return false in all other cases.</p> </dd></dl> <dl class="function"> <dt id="PyClass_IsSubclass"> int <tt class="descname">PyClass_IsSubclass</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *klass</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *base</em><big>)</big><a class="headerlink" href="#PyClass_IsSubclass" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if <em>klass</em> is a subclass of <em>base</em>. Return false in all other cases.</p> </dd></dl> <p id="index-2">There are very few functions specific to instance objects.</p> <dl class="var"> <dt id="PyInstance_Type"> <a class="reference internal" href="type.html#PyTypeObject" title="PyTypeObject">PyTypeObject</a> <tt class="descname">PyInstance_Type</tt><a class="headerlink" href="#PyInstance_Type" title="Permalink to this definition">¶</a></dt> <dd><p>Type object for class instances.</p> </dd></dl> <dl class="function"> <dt id="PyInstance_Check"> int <tt class="descname">PyInstance_Check</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *obj</em><big>)</big><a class="headerlink" href="#PyInstance_Check" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if <em>obj</em> is an instance.</p> </dd></dl> <dl class="function"> <dt id="PyInstance_New"> <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyInstance_New</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *class</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *arg</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *kw</em><big>)</big><a class="headerlink" href="#PyInstance_New" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a new instance of a specific class. The parameters <em>arg</em> and <em>kw</em> are used as the positional and keyword parameters to the object’s constructor.</p> </dd></dl> <dl class="function"> <dt id="PyInstance_NewRaw"> <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyInstance_NewRaw</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *class</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *dict</em><big>)</big><a class="headerlink" href="#PyInstance_NewRaw" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a new instance of a specific class without calling its constructor. <em>class</em> is the class of new object. The <em>dict</em> parameter will be used as the object’s <tt class="xref py py-attr docutils literal"><span class="pre">__dict__</span></tt>; if <em>NULL</em>, a new dictionary will be created for the instance.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="dict.html" title="previous chapter">Dictionary Objects</a></p> <h4>Next topic</h4> <p class="topless"><a href="function.html" title="next chapter">Function Objects</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/class.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="function.html" title="Function Objects" >next</a> |</li> <li class="right" > <a href="dict.html" title="Dictionary Objects" >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" >Python/C API Reference Manual</a> »</li> <li><a href="concrete.html" >Concrete Objects Layer</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2020, 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 Oct 13, 2020. <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>