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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">
<tt class="descname">PyTypeObject</tt><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>* <tt class="descname">PyType_Type</tt><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 <tt class="docutils literal"><span class="pre">type</span></tt> and
<tt class="docutils literal"><span class="pre">types.TypeType</span></tt> in the Python layer.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyType_Check">
int <tt class="descname">PyType_Check</tt><big>(</big><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><big>)</big><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 <tt class="descname">PyType_CheckExact</tt><big>(</big><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><big>)</big><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">New in version 2.2.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_ClearCache">
unsigned int <tt class="descname">PyType_ClearCache</tt><big>(</big><big>)</big><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">New in version 2.6.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_Modified">
void <tt class="descname">PyType_Modified</tt><big>(</big><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em><big>)</big><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">New in version 2.6.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_HasFeature">
int <tt class="descname">PyType_HasFeature</tt><big>(</big><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, int<em> feature</em><big>)</big><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 <tt class="descname">PyType_IS_GC</tt><big>(</big><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><big>)</big><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"><tt class="xref py py-const docutils literal"><span class="pre">Py_TPFLAGS_HAVE_GC</span></tt></a>.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.0.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_IsSubtype">
int <tt class="descname">PyType_IsSubtype</tt><big>(</big><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><big>)</big><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">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__"><tt class="xref py py-meth docutils literal"><span class="pre">__subclasscheck__()</span></tt></a> is not called on <em>b</em>. Call
<a class="reference internal" href="object.html#c.PyObject_IsSubclass" title="PyObject_IsSubclass"><tt class="xref c c-func docutils literal"><span class="pre">PyObject_IsSubclass()</span></tt></a> to do the same check that <a class="reference internal" href="../library/functions.html#issubclass" title="issubclass"><tt class="xref py py-func docutils literal"><span class="pre">issubclass()</span></tt></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>* <tt class="descname">PyType_GenericAlloc</tt><big>(</big><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em>, Py_ssize_t<em> nitems</em><big>)</big><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">New in version 2.2.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> 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>* <tt class="descname">PyType_GenericNew</tt><big>(</big><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><big>)</big><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">New in version 2.2.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="c.PyType_Ready">
int <tt class="descname">PyType_Ready</tt><big>(</big><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em><big>)</big><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 <tt class="docutils literal"><span class="pre">0</span></tt> on success, or return <tt class="docutils literal"><span class="pre">-1</span></tt> and sets an
exception on error.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.2.</span></p>
</div>
</dd></dl>
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