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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Iterator Objects — Python 2.7.16 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.16 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="Descriptor Objects" href="descriptor.html" /> <link rel="prev" title="Module Objects" href="module.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/c-api/iterator.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="descriptor.html" title="Descriptor Objects" accesskey="N">next</a> |</li> <li class="right" > <a href="module.html" title="Module Objects" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-2"><a href="concrete.html" accesskey="U">Concrete Objects Layer</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <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__"><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="var"> <dt id="c.PySeqIter_Type"> <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="descname">PySeqIter_Type</code><a class="headerlink" href="#c.PySeqIter_Type" title="Permalink to this definition">¶</a></dt> <dd><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> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> <dl class="function"> <dt id="c.PySeqIter_Check"> int <code class="descname">PySeqIter_Check</code><span class="sig-paren">(</span>op<span class="sig-paren">)</span><a class="headerlink" href="#c.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="#c.PySeqIter_Type" title="PySeqIter_Type"><code class="xref c c-data docutils literal notranslate"><span class="pre">PySeqIter_Type</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> <dl class="function"> <dt id="c.PySeqIter_New"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PySeqIter_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *seq</em><span class="sig-paren">)</span><a class="headerlink" href="#c.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"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a> for the subscripting operation.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> <dl class="var"> <dt id="c.PyCallIter_Type"> <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="descname">PyCallIter_Type</code><a class="headerlink" href="#c.PyCallIter_Type" title="Permalink to this definition">¶</a></dt> <dd><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> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> <dl class="function"> <dt id="c.PyCallIter_Check"> int <code class="descname">PyCallIter_Check</code><span class="sig-paren">(</span>op<span class="sig-paren">)</span><a class="headerlink" href="#c.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="#c.PyCallIter_Type" title="PyCallIter_Type"><code class="xref c c-data docutils literal notranslate"><span class="pre">PyCallIter_Type</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> <dl class="function"> <dt id="c.PyCallIter_New"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCallIter_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *callable</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *sentinel</em><span class="sig-paren">)</span><a class="headerlink" href="#c.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> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="module.html" title="previous chapter">Module Objects</a></p> <h4>Next topic</h4> <p class="topless"><a href="descriptor.html" title="next chapter">Descriptor Objects</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/c-api/iterator.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="descriptor.html" title="Descriptor Objects" >next</a> |</li> <li class="right" > <a href="module.html" title="Module Objects" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-2"><a href="concrete.html" >Concrete Objects Layer</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2019, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Mar 27, 2019. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.7.6. </div> </body> </html>
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