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  <div class="section" id="iterator-objects">
<span id="id1"></span><h1>Iterator Objects<a class="headerlink" href="#iterator-objects" title="Permalink to this headline">¶</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__"><tt class="xref py py-meth docutils literal"><span class="pre">__getitem__()</span></tt></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="var">
<dt id="PySeqIter_Type">
<a class="reference internal" href="type.html#PyTypeObject" title="PyTypeObject">PyTypeObject</a> <tt class="descname">PySeqIter_Type</tt><a class="headerlink" href="#PySeqIter_Type" title="Permalink to this definition">¶</a></dt>
<dd><p>Type object for iterator objects returned by <a class="reference internal" href="#PySeqIter_New" title="PySeqIter_New"><tt class="xref c c-func docutils literal"><span class="pre">PySeqIter_New()</span></tt></a> and the
one-argument form of the <a class="reference internal" href="../library/functions.html#iter" title="iter"><tt class="xref py py-func docutils literal"><span class="pre">iter()</span></tt></a> built-in function for built-in sequence
types.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="PySeqIter_Check">
int <tt class="descname">PySeqIter_Check</tt><big>(</big>op<big>)</big><a class="headerlink" href="#PySeqIter_Check" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if the type of <em>op</em> is <a class="reference internal" href="#PySeqIter_Type" title="PySeqIter_Type"><tt class="xref c c-data docutils literal"><span class="pre">PySeqIter_Type</span></tt></a>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="PySeqIter_New">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PySeqIter_New</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*seq</em><big>)</big><a class="headerlink" href="#PySeqIter_New" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</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#exceptions.IndexError" title="exceptions.IndexError"><tt class="xref py py-exc docutils literal"><span class="pre">IndexError</span></tt></a> for the subscripting
operation.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

<dl class="var">
<dt id="PyCallIter_Type">
<a class="reference internal" href="type.html#PyTypeObject" title="PyTypeObject">PyTypeObject</a> <tt class="descname">PyCallIter_Type</tt><a class="headerlink" href="#PyCallIter_Type" title="Permalink to this definition">¶</a></dt>
<dd><p>Type object for iterator objects returned by <a class="reference internal" href="#PyCallIter_New" title="PyCallIter_New"><tt class="xref c c-func docutils literal"><span class="pre">PyCallIter_New()</span></tt></a> and the
two-argument form of the <a class="reference internal" href="../library/functions.html#iter" title="iter"><tt class="xref py py-func docutils literal"><span class="pre">iter()</span></tt></a> built-in function.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="PyCallIter_Check">
int <tt class="descname">PyCallIter_Check</tt><big>(</big>op<big>)</big><a class="headerlink" href="#PyCallIter_Check" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if the type of <em>op</em> is <a class="reference internal" href="#PyCallIter_Type" title="PyCallIter_Type"><tt class="xref c c-data docutils literal"><span class="pre">PyCallIter_Type</span></tt></a>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="PyCallIter_New">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyCallIter_New</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*callable</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*sentinel</em><big>)</big><a class="headerlink" href="#PyCallIter_New" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</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>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

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