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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="PyTypeObject">
<tt class="descname">PyTypeObject</tt><a class="headerlink" href="#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="PyType_Type">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyType_Type</tt><a class="headerlink" href="#PyType_Type" title="Permalink to this definition">¶</a></dt>
<dd><p>This is the type object for type objects; it is the same object as
<a class="reference internal" href="../library/functions.html#type" title="type"><tt class="xref py py-class docutils literal"><span class="pre">type</span></tt></a> in the Python layer.</p>
</dd></dl>

<dl class="function">
<dt id="PyType_Check">
int <tt class="descname">PyType_Check</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*o</em><big>)</big><a class="headerlink" href="#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="PyType_CheckExact">
int <tt class="descname">PyType_CheckExact</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*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>
</dd></dl>

<dl class="function">
<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>
</dd></dl>

<dl class="function">
<dt id="PyType_GetFlags">
long <tt class="descname">PyType_GetFlags</tt><big>(</big><a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a>*<em>&nbsp;type</em><big>)</big><a class="headerlink" href="#PyType_GetFlags" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the <tt class="xref py py-attr docutils literal"><span class="pre">tp_flags</span></tt> member of <em>type</em>. This function is primarily
meant for use with <cite>Py_LIMITED_API</cite>; the individual flag bits are
guaranteed to be stable across Python releases, but access to
<tt class="xref py py-attr docutils literal"><span class="pre">tp_flags</span></tt> itself is not part of the limited API.</p>
<p class="versionadded">
<span class="versionmodified">New in version 3.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="PyType_Modified">
void <tt class="descname">PyType_Modified</tt><big>(</big><a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*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>
</dd></dl>

<dl class="function">
<dt id="PyType_HasFeature">
int <tt class="descname">PyType_HasFeature</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*o</em>, int<em>&nbsp;feature</em><big>)</big><a class="headerlink" href="#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="PyType_IS_GC">
int <tt class="descname">PyType_IS_GC</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*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 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>
</dd></dl>

<dl class="function">
<dt id="PyType_IsSubtype">
int <tt class="descname">PyType_IsSubtype</tt><big>(</big><a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*a</em>, <a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*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>
</dd></dl>

<dl class="function">
<dt id="PyType_GenericAlloc">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyType_GenericAlloc</tt><big>(</big><a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*type</em>, Py_ssize_t<em>&nbsp;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>XXX: Document.</p>
</dd></dl>

<dl class="function">
<dt id="PyType_GenericNew">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyType_GenericNew</tt><big>(</big><a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*type</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*args</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*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>XXX: Document.</p>
</dd></dl>

<dl class="function">
<dt id="PyType_Ready">
int <tt class="descname">PyType_Ready</tt><big>(</big><a class="reference internal" href="#PyTypeObject" title="PyTypeObject">PyTypeObject</a><em>&nbsp;*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&#8217;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>
</dd></dl>

</div>


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