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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="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Allocating Objects on the Heap &#8212; Python 3.6.7 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></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 3.6.7 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="Common Object Structures" href="structures.html" /> <link rel="prev" title="Object Implementation Support" href="objimpl.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/c-api/allocation.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <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="structures.html" title="Common Object Structures" accesskey="N">next</a> |</li> <li class="right" > <a href="objimpl.html" title="Object Implementation Support" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; 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Returns the initialized object. If <em>type</em> indicates that the object participates in the cyclic garbage detector, it is added to the detector’s set of observed objects. Other fields of the object are not affected.</p> </dd></dl> <dl class="function"> <dt id="c.PyObject_InitVar"> <a class="reference internal" href="structures.html#c.PyVarObject" title="PyVarObject">PyVarObject</a>* <code class="descname">PyObject_InitVar</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyVarObject" title="PyVarObject">PyVarObject</a><em>&nbsp;*op</em>, <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*type</em>, Py_ssize_t<em>&nbsp;size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_InitVar" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: Borrowed reference.</em><p>This does everything <a class="reference internal" href="#c.PyObject_Init" title="PyObject_Init"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_Init()</span></code></a> does, and also initializes the length information for a variable-size object.</p> </dd></dl> <dl class="function"> <dt id="c.PyObject_New"> TYPE* <code class="descname">PyObject_New</code><span class="sig-paren">(</span>TYPE, <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*type</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_New" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Allocate a new Python object using the C structure type <em>TYPE</em> and the Python type object <em>type</em>. Fields not defined by the Python object header are not initialized; the object’s reference count will be one. The size of the memory allocation is determined from the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_basicsize" title="PyTypeObject.tp_basicsize"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_basicsize</span></code></a> field of the type object.</p> </dd></dl> <dl class="function"> <dt id="c.PyObject_NewVar"> TYPE* <code class="descname">PyObject_NewVar</code><span class="sig-paren">(</span>TYPE, <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*type</em>, Py_ssize_t<em>&nbsp;size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_NewVar" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Allocate a new Python object using the C structure type <em>TYPE</em> and the Python type object <em>type</em>. Fields not defined by the Python object header are not initialized. The allocated memory allows for the <em>TYPE</em> structure plus <em>size</em> fields of the size given by the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_itemsize" title="PyTypeObject.tp_itemsize"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_itemsize</span></code></a> field of <em>type</em>. This is useful for implementing objects like tuples, which are able to determine their size at construction time. Embedding the array of fields into the same allocation decreases the number of allocations, improving the memory management efficiency.</p> </dd></dl> <dl class="function"> <dt id="c.PyObject_Del"> void <code class="descname">PyObject_Del</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em>&nbsp;*op</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_Del" title="Permalink to this definition">¶</a></dt> <dd><p>Releases memory allocated to an object using <a class="reference internal" href="#c.PyObject_New" title="PyObject_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_New()</span></code></a> or <a class="reference internal" href="#c.PyObject_NewVar" title="PyObject_NewVar"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_NewVar()</span></code></a>. This is normally called from the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_dealloc" title="PyTypeObject.tp_dealloc"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_dealloc</span></code></a> handler specified in the object’s type. The fields of the object should not be accessed after this call as the memory is no longer a valid Python object.</p> </dd></dl> <dl class="var"> <dt id="c._Py_NoneStruct"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> <code class="descname">_Py_NoneStruct</code><a class="headerlink" href="#c._Py_NoneStruct" title="Permalink to this definition">¶</a></dt> <dd><p>Object which is visible in Python as <code class="docutils literal notranslate"><span class="pre">None</span></code>. This should only be accessed using the <a class="reference internal" href="none.html#c.Py_None" title="Py_None"><code class="xref c c-macro docutils literal notranslate"><span class="pre">Py_None</span></code></a> macro, which evaluates to a pointer to this object.</p> </dd></dl> <div class="admonition seealso"> <p class="first admonition-title">See also</p> <dl class="last docutils"> <dt><a class="reference internal" href="module.html#c.PyModule_Create" title="PyModule_Create"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyModule_Create()</span></code></a></dt> <dd>To allocate and create extension modules.</dd> </dl> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="objimpl.html" title="previous chapter">Object Implementation Support</a></p> <h4>Next topic</h4> <p class="topless"><a href="structures.html" title="next chapter">Common Object Structures</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.6/Doc/c-api/allocation.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <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="structures.html" title="Common Object Structures" >next</a> |</li> <li class="right" > <a href="objimpl.html" title="Object Implementation Support" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> &#187;</li> <li> <a href="../index.html">3.6.7 Documentation</a> &#187; </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> &#187;</li> <li class="nav-item nav-item-2"><a href="objimpl.html" >Object Implementation Support</a> &#187;</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" 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> </div> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="footer"> &copy; <a href="../copyright.html">Copyright</a> 2001-2023, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Dec 18, 2023. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.7.6. </div> </body> </html>