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<div class="section" id="type-objects">
<span id="typeobjects"></span><h1>Type Objects<a class="headerlink" href="#type-objects" title="Permalink to this headline">¶</a></h1>
<span class="target" id="index-0"></span><dl class="type">
<dt id="c.PyTypeObject">
<code class="descname">PyTypeObject</code><a class="headerlink" href="#c.PyTypeObject" title="Permalink to this definition">¶</a></dt>
<dd><p>The C structure of the objects used to describe built-in types.</p>
</dd></dl>
<dl class="var">
<dt id="c.PyType_Type">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyType_Type</code><a class="headerlink" href="#c.PyType_Type" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-1">This is the type object for type objects; it is the same object as <code class="docutils literal notranslate"><span class="pre">type</span></code> and
<code class="docutils literal notranslate"><span class="pre">types.TypeType</span></code> in the Python layer.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyType_Check">
int <code class="descname">PyType_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_Check" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if the object <em>o</em> is a type object, including instances of types
derived from the standard type object. Return false in all other cases.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyType_CheckExact">
int <code class="descname">PyType_CheckExact</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_CheckExact" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if the object <em>o</em> is a type object, but not a subtype of the
standard type object. Return false in all other cases.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.2.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_ClearCache">
unsigned int <code class="descname">PyType_ClearCache</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_ClearCache" title="Permalink to this definition">¶</a></dt>
<dd><p>Clear the internal lookup cache. Return the current version tag.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.6.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_Modified">
void <code class="descname">PyType_Modified</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_Modified" title="Permalink to this definition">¶</a></dt>
<dd><p>Invalidate the internal lookup cache for the type and all of its
subtypes. This function must be called after any manual
modification of the attributes or base classes of the type.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.6.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_HasFeature">
int <code class="descname">PyType_HasFeature</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, int<em> feature</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_HasFeature" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if the type object <em>o</em> sets the feature <em>feature</em>. Type features
are denoted by single bit flags.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyType_IS_GC">
int <code class="descname">PyType_IS_GC</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_IS_GC" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if the type object includes support for the cycle detector; this
tests the type flag <a class="reference internal" href="typeobj.html#Py_TPFLAGS_HAVE_GC" title="Py_TPFLAGS_HAVE_GC"><code class="xref py py-const docutils literal notranslate"><span class="pre">Py_TPFLAGS_HAVE_GC</span></code></a>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.0.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_IsSubtype">
int <code class="descname">PyType_IsSubtype</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *a</em>, <a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *b</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_IsSubtype" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if <em>a</em> is a subtype of <em>b</em>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.2.</span></p>
</div>
<p>This function only checks for actual subtypes, which means that
<a class="reference internal" href="../reference/datamodel.html#class.__subclasscheck__" title="class.__subclasscheck__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__subclasscheck__()</span></code></a> is not called on <em>b</em>. Call
<a class="reference internal" href="object.html#c.PyObject_IsSubclass" title="PyObject_IsSubclass"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_IsSubclass()</span></code></a> to do the same check that <a class="reference internal" href="../library/functions.html#issubclass" title="issubclass"><code class="xref py py-func docutils literal notranslate"><span class="pre">issubclass()</span></code></a>
would do.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyType_GenericAlloc">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyType_GenericAlloc</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em>, Py_ssize_t<em> nitems</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_GenericAlloc" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><div class="versionadded">
<p><span class="versionmodified added">New in version 2.2.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 2.5: </span>This function used an <code class="xref c c-type docutils literal notranslate"><span class="pre">int</span></code> type for <em>nitems</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_GenericNew">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyType_GenericNew</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *args</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *kwds</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_GenericNew" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><div class="versionadded">
<p><span class="versionmodified added">New in version 2.2.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_Ready">
int <code class="descname">PyType_Ready</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_Ready" title="Permalink to this definition">¶</a></dt>
<dd><p>Finalize a type object. This should be called on all type objects to finish
their initialization. This function is responsible for adding inherited slots
from a type’s base class. Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success, or return <code class="docutils literal notranslate"><span class="pre">-1</span></code> and sets an
exception on error.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 2.2.</span></p>
</div>
</dd></dl>
</div>
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