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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Type Objects — Python 3.7.0 說明文件</title>

title="在 Python 3.7.0 說明文件中搜尋"

href="../_static/opensearch.xml"/>

</head><body>

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<span id="typeobjects"></span><h1>Type Objects<a class="headerlink" href="#type-objects" title="本標題的永久連結">¶</a></h1>

<code class="descname">PyTypeObject</code><a class="headerlink" href="#c.PyTypeObject" title="本定義的永久連結">¶</a></dt>

<dd><p>The C structure of the objects used to describe built-in types.</p>

</dd></dl>

<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="本定義的永久連結">¶</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"><code class="xref py py-class docutils literal notranslate"><span class="pre">type</span></code></a> in the Python layer.</p>

</dd></dl>

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="本定義的永久連結">¶</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>

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="本定義的永久連結">¶</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>

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="本定義的永久連結">¶</a></dt>

<dd><p>Clear the internal lookup cache. Return the current version tag.</p>

</dd></dl>

long <code class="descname">PyType_GetFlags</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_GetFlags" title="本定義的永久連結">¶</a></dt>

<dd><p>Return the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_flags" title="PyTypeObject.tp_flags"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_flags</span></code></a> 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

<a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_flags" title="PyTypeObject.tp_flags"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_flags</span></code></a> itself is not part of the limited API.</p>

</div>

</dd></dl>

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="本定義的永久連結">¶</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>

int <code class="descname">PyType_HasFeature</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *o</em>, int<em> feature</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_HasFeature" title="本定義的永久連結">¶</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>

int <code class="descname">PyType_IS_GC</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_IS_GC" title="本定義的永久連結">¶</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>

</dd></dl>

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="本定義的永久連結">¶</a></dt>

<dd><p>Return true if <em>a</em> is a subtype of <em>b</em>.</p>

<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>

<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="本定義的永久連結">¶</a></dt>

<dd><em class="refcount">Return value: New reference.</em><p>Generic handler for the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_alloc" title="PyTypeObject.tp_alloc"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_alloc</span></code></a> slot of a type object. Use

Python’s default memory allocation mechanism to allocate a new instance and

initialize all its contents to <em>NULL</em>.</p>

</dd></dl>

<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="本定義的永久連結">¶</a></dt>

<dd><em class="refcount">Return value: New reference.</em><p>Generic handler for the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_new" title="PyTypeObject.tp_new"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_new</span></code></a> slot of a type object. Create a

new instance using the type’s <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_alloc" title="PyTypeObject.tp_alloc"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_alloc</span></code></a> slot.</p>

</dd></dl>

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="本定義的永久連結">¶</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>

</dd></dl>

<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyType_FromSpec</code><span class="sig-paren">(</span>PyType_Spec<em> *spec</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_FromSpec" title="本定義的永久連結">¶</a></dt>

<dd><p>Creates and returns a heap type object from the <em>spec</em> passed to the function.</p>

</dd></dl>

<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyType_FromSpecWithBases</code><span class="sig-paren">(</span>PyType_Spec<em> *spec</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *bases</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_FromSpecWithBases" title="本定義的永久連結">¶</a></dt>

<dd><p>Creates and returns a heap type object from the <em>spec</em>. In addition to that,

the created heap type contains all types contained by the <em>bases</em> tuple as base

types. This allows the caller to reference other heap types as base types.</p>

</div>

</dd></dl>

void* <code class="descname">PyType_GetSlot</code><span class="sig-paren">(</span><a class="reference internal" href="#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a><em> *type</em>, int<em> slot</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyType_GetSlot" title="本定義的永久連結">¶</a></dt>

<dd><p>Return the function pointer stored in the given slot. If the

result is <em>NULL</em>, this indicates that either the slot is <em>NULL</em>,

or that the function was called with invalid parameters.

Callers will typically cast the result pointer into the appropriate

function type.</p>

</div>

</dd></dl>

</div>

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