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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-156"></span><dl class="ctype">
<dt id="PyTypeObject">
<tt class="descname">PyTypeObject</tt><a class="headerlink" href="#PyTypeObject" title="Permalink to this definition">¶</a></dt>
<dd>The C structure of the objects used to describe built-in types.</dd></dl>
<dl class="cvar">
<dt id="PyType_Type">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyType_Type</tt><a class="headerlink" href="#PyType_Type" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-157">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="cfunction">
<dt id="PyType_Check">
int <tt class="descname">PyType_Check</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#PyType_Check" title="Permalink to this definition">¶</a></dt>
<dd>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.</dd></dl>
<dl class="cfunction">
<dt id="PyType_CheckExact">
int <tt class="descname">PyType_CheckExact</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#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>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_ClearCache">
unsigned int <tt class="descname">PyType_ClearCache</tt><big>(</big><big>)</big><a class="headerlink" href="#PyType_ClearCache" title="Permalink to this definition">¶</a></dt>
<dd><p>Clear the internal lookup cache. Return the current version tag.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_Modified">
void <tt class="descname">PyType_Modified</tt><big>(</big><a title="PyTypeObject" class="reference internal" href="#PyTypeObject">PyTypeObject</a><em> *type</em><big>)</big><a class="headerlink" href="#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>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_HasFeature">
int <tt class="descname">PyType_HasFeature</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, int<em> feature</em><big>)</big><a class="headerlink" href="#PyType_HasFeature" title="Permalink to this definition">¶</a></dt>
<dd>Return true if the type object <em>o</em> sets the feature <em>feature</em>. Type features
are denoted by single bit flags.</dd></dl>
<dl class="cfunction">
<dt id="PyType_IS_GC">
int <tt class="descname">PyType_IS_GC</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#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 title="Py_TPFLAGS_HAVE_GC" class="reference external" href="typeobj.html#Py_TPFLAGS_HAVE_GC"><tt class="xref docutils literal"><span class="pre">Py_TPFLAGS_HAVE_GC</span></tt></a>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.0.</span></p>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_IsSubtype">
int <tt class="descname">PyType_IsSubtype</tt><big>(</big><a title="PyTypeObject" class="reference internal" href="#PyTypeObject">PyTypeObject</a><em> *a</em>, <a title="PyTypeObject" class="reference internal" href="#PyTypeObject">PyTypeObject</a><em> *b</em><big>)</big><a class="headerlink" href="#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>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_GenericAlloc">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyType_GenericAlloc</tt><big>(</big><a title="PyTypeObject" class="reference internal" href="#PyTypeObject">PyTypeObject</a><em> *type</em>, Py_ssize_t<em> nitems</em><big>)</big><a class="headerlink" href="#PyType_GenericAlloc" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref 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>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_GenericNew">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyType_GenericNew</tt><big>(</big><a title="PyTypeObject" class="reference internal" href="#PyTypeObject">PyTypeObject</a><em> *type</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *args</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *kwds</em><big>)</big><a class="headerlink" href="#PyType_GenericNew" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>
<dl class="cfunction">
<dt id="PyType_Ready">
int <tt class="descname">PyType_Ready</tt><big>(</big><a title="PyTypeObject" class="reference internal" href="#PyTypeObject">PyTypeObject</a><em> *type</em><big>)</big><a class="headerlink" href="#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>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>
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