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aria-label="main navigation"> <div class="language_switcher_placeholder"></div> <h4>Previous topic</h4> <p class="topless"><a href="memory.html" title="previous chapter">Memory Management</a></p> <h4>Next topic</h4> <p class="topless"><a href="allocation.html" title="next chapter">Allocating Objects on the Heap</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/3.10/Doc/c-api/objimpl.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </nav> </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" 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="allocation.html" title="Allocating Objects on the Heap" accesskey="N">next</a> |</li> <li class="right" > <a href="memory.html" title="Memory Management" accesskey="P">previous</a> |</li> <li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li class="switchers"> <div class="language_switcher_placeholder"></div> <div class="version_switcher_placeholder"></div> </li> <li> </li> <li id="cpython-language-and-version"> <a href="../index.html">3.10.12 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" accesskey="U">Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-this"><a href="">Object Implementation Support</a></li> <li class="right"> <div class="inline-search" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" aria-label="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> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="object-implementation-support"> <span id="newtypes"></span><h1>Object Implementation Support<a class="headerlink" href="#object-implementation-support" title="Permalink to this headline">¶</a></h1> <p>This chapter describes the functions, types, and macros used when defining new object types.</p> <div class="toctree-wrapper compound"> <ul> <li class="toctree-l1"><a class="reference internal" href="allocation.html">Allocating Objects on the Heap</a></li> <li class="toctree-l1"><a class="reference internal" href="structures.html">Common Object Structures</a><ul> <li class="toctree-l2"><a class="reference internal" href="structures.html#base-object-types-and-macros">Base object types and macros</a></li> <li class="toctree-l2"><a class="reference internal" href="structures.html#implementing-functions-and-methods">Implementing functions and methods</a></li> <li class="toctree-l2"><a class="reference internal" href="structures.html#accessing-attributes-of-extension-types">Accessing attributes of extension types</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html">Type Objects</a><ul> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#quick-reference">Quick Reference</a><ul> <li class="toctree-l3"><a class="reference internal" href="typeobj.html#tp-slots">“tp slots”</a></li> <li class="toctree-l3"><a class="reference internal" href="typeobj.html#sub-slots">sub-slots</a></li> <li class="toctree-l3"><a class="reference internal" href="typeobj.html#slot-typedefs">slot typedefs</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#pytypeobject-definition">PyTypeObject Definition</a></li> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#pyobject-slots">PyObject Slots</a></li> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#pyvarobject-slots">PyVarObject Slots</a></li> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#pytypeobject-slots">PyTypeObject Slots</a></li> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#static-types">Static Types</a></li> <li class="toctree-l2"><a class="reference internal" href="typeobj.html#heap-types">Heap Types</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#number-object-structures">Number Object Structures</a></li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#mapping-object-structures">Mapping Object Structures</a></li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#sequence-object-structures">Sequence Object Structures</a></li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#buffer-object-structures">Buffer Object Structures</a></li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#async-object-structures">Async Object Structures</a></li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#slot-type-typedefs">Slot Type typedefs</a></li> <li class="toctree-l1"><a class="reference internal" href="typeobj.html#examples">Examples</a></li> <li class="toctree-l1"><a class="reference internal" href="gcsupport.html">Supporting Cyclic Garbage Collection</a><ul> <li class="toctree-l2"><a class="reference internal" href="gcsupport.html#controlling-the-garbage-collector-state">Controlling the Garbage Collector State</a></li> </ul> </li> </ul> </div> </section> <div class="clearer"></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="memory.html" title="previous chapter">Memory Management</a></p> <h4>Next topic</h4> <p class="topless"><a href="allocation.html" title="next chapter">Allocating Objects on the Heap</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/3.10/Doc/c-api/objimpl.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="allocation.html" title="Allocating Objects on the Heap" >next</a> |</li> <li class="right" > <a href="memory.html" title="Memory Management" >previous</a> |</li> <li><img 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