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<li><a class="reference internal" href="#">Descriptor Objects</a><ul>
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  <section id="descriptor-objects">
<span id="id1"></span><h1>Descriptor Objects<a class="headerlink" href="#descriptor-objects" title="Link to this heading">¶</a></h1>
<p>“Descriptors” are objects that describe some attribute of an object. They are
found in the dictionary of type objects.</p>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyProperty_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyProperty_Type</span></span></span><a class="headerlink" href="#c.PyProperty_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for the built-in descriptor types.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyDescr_NewGetSet">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyDescr_NewGetSet</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><a class="reference internal" href="structures.html#c.PyGetSetDef" title="PyGetSetDef"><span class="n"><span class="pre">PyGetSetDef</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">getset</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyDescr_NewGetSet" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyDescr_NewMember">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyDescr_NewMember</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><a class="reference internal" href="structures.html#c.PyMemberDef" title="PyMemberDef"><span class="n"><span class="pre">PyMemberDef</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">meth</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyDescr_NewMember" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyMemberDescr_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyMemberDescr_Type</span></span></span><a class="headerlink" href="#c.PyMemberDescr_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for member descriptor objects created from
<a class="reference internal" href="structures.html#c.PyMemberDef" title="PyMemberDef"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyMemberDef</span></code></a> structures. These descriptors expose fields of a
C struct as attributes on a type, and correspond
to <a class="reference internal" href="../library/types.html#types.MemberDescriptorType" title="types.MemberDescriptorType"><code class="xref py py-class docutils literal notranslate"><span class="pre">types.MemberDescriptorType</span></code></a> objects in Python.</p>
</dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyGetSetDescr_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyGetSetDescr_Type</span></span></span><a class="headerlink" href="#c.PyGetSetDescr_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for get/set descriptor objects created from
<a class="reference internal" href="structures.html#c.PyGetSetDef" title="PyGetSetDef"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyGetSetDef</span></code></a> structures. These descriptors implement attributes
whose value is computed by C getter and setter functions, and are used
for many built-in type attributes.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyDescr_NewMethod">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyDescr_NewMethod</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><a class="reference internal" href="structures.html#c.PyMethodDef" title="PyMethodDef"><span class="n"><span class="pre">PyMethodDef</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">meth</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyDescr_NewMethod" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyMethodDescr_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyMethodDescr_Type</span></span></span><a class="headerlink" href="#c.PyMethodDescr_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for method descriptor objects created from
<a class="reference internal" href="structures.html#c.PyMethodDef" title="PyMethodDef"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyMethodDef</span></code></a> structures. These descriptors expose C functions as
methods on a type, and correspond to <a class="reference internal" href="../library/types.html#types.MemberDescriptorType" title="types.MemberDescriptorType"><code class="xref py py-class docutils literal notranslate"><span class="pre">types.MemberDescriptorType</span></code></a>
objects in Python.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyDescr_NewWrapper">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyDescr_NewWrapper</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <span class="k"><span class="pre">struct</span></span><span class="w"> </span><span class="n"><span class="pre">wrapperbase</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">wrapper</span></span>, <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">wrapped</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyDescr_NewWrapper" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em></dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyWrapperDescr_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyWrapperDescr_Type</span></span></span><a class="headerlink" href="#c.PyWrapperDescr_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for wrapper descriptor objects created by
<a class="reference internal" href="#c.PyDescr_NewWrapper" title="PyDescr_NewWrapper"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyDescr_NewWrapper()</span></code></a> and <a class="reference internal" href="#c.PyWrapper_New" title="PyWrapper_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyWrapper_New()</span></code></a>. Wrapper
descriptors are used internally to expose special methods implemented
via wrapper structures, and appear in Python as
<a class="reference internal" href="../library/types.html#types.WrapperDescriptorType" title="types.WrapperDescriptorType"><code class="xref py py-class docutils literal notranslate"><span class="pre">types.WrapperDescriptorType</span></code></a> objects.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyDescr_NewClassMethod">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyDescr_NewClassMethod</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <a class="reference internal" href="structures.html#c.PyMethodDef" title="PyMethodDef"><span class="n"><span class="pre">PyMethodDef</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">method</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyDescr_NewClassMethod" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyDescr_IsData">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDescr_IsData</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">descr</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyDescr_IsData" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return non-zero if the descriptor object <em>descr</em> describes a data attribute, or
<code class="docutils literal notranslate"><span class="pre">0</span></code> if it describes a method.  <em>descr</em> must be a descriptor object; there is
no error checking.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyWrapper_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyWrapper_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="p"><span class="pre">*</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="p"><span class="pre">*</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyWrapper_New" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>

<section id="built-in-descriptors">
<h2>Built-in descriptors<a class="headerlink" href="#built-in-descriptors" title="Link to this heading">¶</a></h2>
<dl class="c var">
<dt class="sig sig-object c" id="c.PySuper_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PySuper_Type</span></span></span><a class="headerlink" href="#c.PySuper_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for super objects. This is the same object as
<a class="reference internal" href="../library/functions.html#super" title="super"><code class="xref py py-class docutils literal notranslate"><span class="pre">super</span></code></a> in the Python layer.</p>
</dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyClassMethod_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyClassMethod_Type</span></span></span><a class="headerlink" href="#c.PyClassMethod_Type" title="Link to this definition">¶</a><br /></dt>
<dd><p>The type of class method objects. This is the same object as
<a class="reference internal" href="../library/functions.html#classmethod" title="classmethod"><code class="xref py py-class docutils literal notranslate"><span class="pre">classmethod</span></code></a> in the Python layer.</p>
</dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyClassMethodDescr_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyClassMethodDescr_Type</span></span></span><a class="headerlink" href="#c.PyClassMethodDescr_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for C-level class method descriptor objects.
This is the type of the descriptors created for <a class="reference internal" href="../library/functions.html#classmethod" title="classmethod"><code class="xref py py-func docutils literal notranslate"><span class="pre">classmethod()</span></code></a> defined in
C extension types, and is the same object as <a class="reference internal" href="../library/functions.html#classmethod" title="classmethod"><code class="xref py py-class docutils literal notranslate"><span class="pre">classmethod</span></code></a>
in Python.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyClassMethod_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyClassMethod_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">callable</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyClassMethod_New" title="Link to this definition">¶</a><br /></dt>
<dd><p>Create a new <a class="reference internal" href="../library/functions.html#classmethod" title="classmethod"><code class="xref py py-class docutils literal notranslate"><span class="pre">classmethod</span></code></a> object wrapping <em>callable</em>.
<em>callable</em> must be a callable object and must not be <code class="docutils literal notranslate"><span class="pre">NULL</span></code>.</p>
<p>On success, this function returns a <a class="reference internal" href="../glossary.html#term-strong-reference"><span class="xref std std-term">strong reference</span></a> to a new class
method descriptor. On failure, this function returns <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an
exception set.</p>
</dd></dl>

<dl class="c var">
<dt class="sig sig-object c" id="c.PyStaticMethod_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStaticMethod_Type</span></span></span><a class="headerlink" href="#c.PyStaticMethod_Type" title="Link to this definition">¶</a><br /></dt>
<dd><p>The type of static method objects. This is the same object as
<a class="reference internal" href="../library/functions.html#staticmethod" title="staticmethod"><code class="xref py py-class docutils literal notranslate"><span class="pre">staticmethod</span></code></a> in the Python layer.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyStaticMethod_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyStaticMethod_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">callable</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStaticMethod_New" title="Link to this definition">¶</a><br /></dt>
<dd><p>Create a new <a class="reference internal" href="../library/functions.html#staticmethod" title="staticmethod"><code class="xref py py-class docutils literal notranslate"><span class="pre">staticmethod</span></code></a> object wrapping <em>callable</em>.
<em>callable</em> must be a callable object and must not be <code class="docutils literal notranslate"><span class="pre">NULL</span></code>.</p>
<p>On success, this function returns a <a class="reference internal" href="../glossary.html#term-strong-reference"><span class="xref std std-term">strong reference</span></a> to a new static
method descriptor. On failure, this function returns <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an
exception set.</p>
</dd></dl>

</section>
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