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<ul>
<li><a class="reference internal" href="#">Iterator Objects</a><ul>
<li><a class="reference internal" href="#range-objects">Range Objects</a></li>
<li><a class="reference internal" href="#builtin-iterator-types">Builtin Iterator Types</a></li>
<li><a class="reference internal" href="#other-iterator-objects">Other Iterator Objects</a></li>
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<section id="iterator-objects">
<span id="id1"></span><h1>Iterator Objects<a class="headerlink" href="#iterator-objects" title="Link to this heading">¶</a></h1>
<p>Python provides two general-purpose iterator objects. The first, a sequence
iterator, works with an arbitrary sequence supporting the <a class="reference internal" href="../reference/datamodel.html#object.__getitem__" title="object.__getitem__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getitem__()</span></code></a>
method. The second works with a callable object and a sentinel value, calling
the callable for each item in the sequence, and ending the iteration when the
sentinel value is returned.</p>
<dl class="c var">
<dt class="sig sig-object c" id="c.PySeqIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PySeqIter_Type</span></span></span><a class="headerlink" href="#c.PySeqIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Type object for iterator objects returned by <a class="reference internal" href="#c.PySeqIter_New" title="PySeqIter_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySeqIter_New()</span></code></a> and the
one-argument form of the <a class="reference internal" href="../library/functions.html#iter" title="iter"><code class="xref py py-func docutils literal notranslate"><span class="pre">iter()</span></code></a> built-in function for built-in sequence
types.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PySeqIter_Check">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PySeqIter_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">op</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PySeqIter_Check" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return true if the type of <em>op</em> is <a class="reference internal" href="#c.PySeqIter_Type" title="PySeqIter_Type"><code class="xref c c-data docutils literal notranslate"><span class="pre">PySeqIter_Type</span></code></a>. This function
always succeeds.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PySeqIter_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PySeqIter_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">seq</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PySeqIter_New" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return an iterator that works with a general sequence object, <em>seq</em>. The
iteration ends when the sequence raises <a class="reference internal" href="../library/exceptions.html#IndexError" title="IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a> for the subscripting
operation.</p>
</dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyCallIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCallIter_Type</span></span></span><a class="headerlink" href="#c.PyCallIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Type object for iterator objects returned by <a class="reference internal" href="#c.PyCallIter_New" title="PyCallIter_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCallIter_New()</span></code></a> and the
two-argument form of the <a class="reference internal" href="../library/functions.html#iter" title="iter"><code class="xref py py-func docutils literal notranslate"><span class="pre">iter()</span></code></a> built-in function.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCallIter_Check">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCallIter_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">op</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCallIter_Check" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return true if the type of <em>op</em> is <a class="reference internal" href="#c.PyCallIter_Type" title="PyCallIter_Type"><code class="xref c c-data docutils literal notranslate"><span class="pre">PyCallIter_Type</span></code></a>. This
function always succeeds.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCallIter_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyCallIter_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">callable</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">sentinel</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCallIter_New" title="Link to this definition">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return a new iterator. The first parameter, <em>callable</em>, can be any Python
callable object that can be called with no parameters; each call to it should
return the next item in the iteration. When <em>callable</em> returns a value equal to
<em>sentinel</em>, the iteration will be terminated.</p>
</dd></dl>
<section id="range-objects">
<h2>Range Objects<a class="headerlink" href="#range-objects" title="Link to this heading">¶</a></h2>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyRange_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyRange_Type</span></span></span><a class="headerlink" href="#c.PyRange_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>The type object for <a class="reference internal" href="../library/stdtypes.html#range" title="range"><code class="xref py py-class docutils literal notranslate"><span class="pre">range</span></code></a> objects.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyRange_Check">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyRange_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">o</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyRange_Check" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return true if the object <em>o</em> is an instance of a <a class="reference internal" href="../library/stdtypes.html#range" title="range"><code class="xref py py-class docutils literal notranslate"><span class="pre">range</span></code></a> object.
This function always succeeds.</p>
</dd></dl>
</section>
<section id="builtin-iterator-types">
<h2>Builtin Iterator Types<a class="headerlink" href="#builtin-iterator-types" title="Link to this heading">¶</a></h2>
<p>These are built-in iteration types that are included in Python’s C API, but
provide no additional functions. They are here for completeness.</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>C type</p></th>
<th class="head"><p>Python type</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><dl class="c var">
<dt class="sig sig-object c" id="c.PyEnum_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyEnum_Type</span></span></span><a class="headerlink" href="#c.PyEnum_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
</td>
<td><p><a class="reference internal" href="../library/functions.html#enumerate" title="enumerate"><code class="xref py py-class docutils literal notranslate"><span class="pre">enumerate</span></code></a></p></td>
</tr>
<tr class="row-odd"><td><dl class="c var">
<dt class="sig sig-object c" id="c.PyFilter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyFilter_Type</span></span></span><a class="headerlink" href="#c.PyFilter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
</td>
<td><p><a class="reference internal" href="../library/functions.html#filter" title="filter"><code class="xref py py-class docutils literal notranslate"><span class="pre">filter</span></code></a></p></td>
</tr>
<tr class="row-even"><td><dl class="c var">
<dt class="sig sig-object c" id="c.PyMap_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyMap_Type</span></span></span><a class="headerlink" href="#c.PyMap_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
</td>
<td><p><a class="reference internal" href="../library/functions.html#map" title="map"><code class="xref py py-class docutils literal notranslate"><span class="pre">map</span></code></a></p></td>
</tr>
<tr class="row-odd"><td><dl class="c var">
<dt class="sig sig-object c" id="c.PyReversed_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyReversed_Type</span></span></span><a class="headerlink" href="#c.PyReversed_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
</td>
<td><p><a class="reference internal" href="../library/functions.html#reversed" title="reversed"><code class="xref py py-class docutils literal notranslate"><span class="pre">reversed</span></code></a></p></td>
</tr>
<tr class="row-even"><td><dl class="c var">
<dt class="sig sig-object c" id="c.PyZip_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyZip_Type</span></span></span><a class="headerlink" href="#c.PyZip_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
</td>
<td><p><a class="reference internal" href="../library/functions.html#zip" title="zip"><code class="xref py py-class docutils literal notranslate"><span class="pre">zip</span></code></a></p></td>
</tr>
</tbody>
</table>
</section>
<section id="other-iterator-objects">
<h2>Other Iterator Objects<a class="headerlink" href="#other-iterator-objects" title="Link to this heading">¶</a></h2>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyByteArrayIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyByteArrayIter_Type</span></span></span><a class="headerlink" href="#c.PyByteArrayIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyBytesIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyBytesIter_Type</span></span></span><a class="headerlink" href="#c.PyBytesIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyListIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyListIter_Type</span></span></span><a class="headerlink" href="#c.PyListIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyListRevIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyListRevIter_Type</span></span></span><a class="headerlink" href="#c.PyListRevIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PySetIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PySetIter_Type</span></span></span><a class="headerlink" href="#c.PySetIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyTupleIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTupleIter_Type</span></span></span><a class="headerlink" href="#c.PyTupleIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyRangeIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyRangeIter_Type</span></span></span><a class="headerlink" href="#c.PyRangeIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyLongRangeIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyLongRangeIter_Type</span></span></span><a class="headerlink" href="#c.PyLongRangeIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyDictIterKey_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDictIterKey_Type</span></span></span><a class="headerlink" href="#c.PyDictIterKey_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyDictRevIterKey_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDictRevIterKey_Type</span></span></span><a class="headerlink" href="#c.PyDictRevIterKey_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> since version 3.8.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyDictIterValue_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDictIterValue_Type</span></span></span><a class="headerlink" href="#c.PyDictIterValue_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyDictRevIterValue_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDictRevIterValue_Type</span></span></span><a class="headerlink" href="#c.PyDictRevIterValue_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> since version 3.8.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyDictIterItem_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDictIterItem_Type</span></span></span><a class="headerlink" href="#c.PyDictIterItem_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyDictRevIterItem_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyDictRevIterItem_Type</span></span></span><a class="headerlink" href="#c.PyDictRevIterItem_Type" title="Link to this definition">¶</a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> since version 3.8.</em></dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyODictIter_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyODictIter_Type</span></span></span><a class="headerlink" href="#c.PyODictIter_Type" title="Link to this definition">¶</a><br /></dt>
<dd><p>Type objects for iterators of various built-in objects.</p>
<p>Do not create instances of these directly; prefer calling
<a class="reference internal" href="object.html#c.PyObject_GetIter" title="PyObject_GetIter"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_GetIter()</span></code></a> instead.</p>
<p>Note that there is no guarantee that a given built-in type uses a given iterator
type. For example, iterating over <a class="reference internal" href="../library/stdtypes.html#range" title="range"><code class="xref py py-class docutils literal notranslate"><span class="pre">range</span></code></a> will use one of two iterator
types depending on the size of the range. Other types may start using a
similar scheme in the future, without warning.</p>
</dd></dl>
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