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Code Editor : type.html

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<title>Type Objects &#8212; Python 2.7.18 documentation</title>
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 <section id="type-objects">
<h1>Type Objects<a class="headerlink" href="#type-objects" title="Permalink to this headline">¶</a></h1>
<dl class="c type">
<dt class="sig sig-object c" id="c.PyTypeObject">
type PyTypeObject<a class="headerlink" href="#c.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="c var">
<dt class="sig sig-object c" id="c.PyType_Type">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PyType_Type<a class="headerlink" href="#c.PyType_Type" title="Permalink to this definition">¶</a> </dt>
<dd>This is the type object for type objects; it is the same object as <code class="docutils literal notranslate">type</code> and
<code class="docutils literal notranslate">types.TypeType</code> in the Python layer.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_Check">
int PyType_Check(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PyType_Check" title="Permalink to this definition">¶</a> </dt>
<dd>Return true if the object o is a type object, including instances of types
derived from the standard type object. Return false in all other cases.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_CheckExact">
int PyType_CheckExact(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PyType_CheckExact" title="Permalink to this definition">¶</a> </dt>
<dd>Return true if the object o is a type object, but not a subtype of the
standard type object. Return false in all other cases.
<div class="versionadded">
New in version 2.2.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_ClearCache">
unsigned int PyType_ClearCache()<a class="headerlink" href="#c.PyType_ClearCache" title="Permalink to this definition">¶</a> </dt>
<dd>Clear the internal lookup cache. Return the current version tag.
<div class="versionadded">
New in version 2.6.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_Modified">
void PyType_Modified(<a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> *type)<a class="headerlink" href="#c.PyType_Modified" title="Permalink to this definition">¶</a> </dt>
<dd>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.
<div class="versionadded">
New in version 2.6.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_HasFeature">
int PyType_HasFeature(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, int feature)<a class="headerlink" href="#c.PyType_HasFeature" title="Permalink to this definition">¶</a> </dt>
<dd>Return true if the type object o sets the feature feature. Type features
are denoted by single bit flags.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_IS_GC">
int PyType_IS_GC(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PyType_IS_GC" title="Permalink to this definition">¶</a> </dt>
<dd>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">Py_TPFLAGS_HAVE_GC</code></a>.
<div class="versionadded">
New in version 2.0.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_IsSubtype">
int PyType_IsSubtype(<a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> *a, <a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> *b)<a class="headerlink" href="#c.PyType_IsSubtype" title="Permalink to this definition">¶</a> </dt>
<dd>Return true if a is a subtype of b.
<div class="versionadded">
New in version 2.2.
</div>
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">__subclasscheck__()</code></a> is not called on b. Call
<a class="reference internal" href="object.html#c.PyObject_IsSubclass" title="PyObject_IsSubclass"><code class="xref c c-func docutils literal notranslate">PyObject_IsSubclass()</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">issubclass()</code></a>
would do.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_GenericAlloc">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PyType_GenericAlloc(<a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> *type, Py_ssize_t nitems)<a class="headerlink" href="#c.PyType_GenericAlloc" title="Permalink to this definition">¶</a> </dt>
<dd><div class="versionadded">
New in version 2.2.
</div>
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for nitems. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_GenericNew">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PyType_GenericNew(<a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> *type, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *args, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *kwds)<a class="headerlink" href="#c.PyType_GenericNew" title="Permalink to this definition">¶</a> </dt>
<dd><div class="versionadded">
New in version 2.2.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyType_Ready">
int PyType_Ready(<a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> *type)<a class="headerlink" href="#c.PyType_Ready" title="Permalink to this definition">¶</a> </dt>
<dd>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">0</code> on success, or return <code class="docutils literal notranslate">-1</code> and sets an
exception on error.
<div class="versionadded">
New in version 2.2.
</div>
</dd></dl>

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