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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>Mapping Protocol — 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="Iterator Protocol" href="iter.html" /> <link rel="prev" title="Sequence Protocol" href="sequence.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/c-api/mapping.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="iter.html" title="Iterator Protocol" accesskey="N">next</a> |</li> <li class="right" > <a href="sequence.html" title="Sequence Protocol" 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="abstract.html" accesskey="U">Abstract Objects Layer</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="mapping-protocol"> <span id="mapping"></span><h1>Mapping Protocol<a class="headerlink" href="#mapping-protocol" title="Permalink to this headline">¶</a></h1> <dl class="function"> <dt id="c.PyMapping_Check"> int <code class="descname">PyMapping_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.PyMapping_Check" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">1</span></code> if the object provides mapping protocol, and <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise. This function always succeeds.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_Size"> Py_ssize_t <code class="descname">PyMapping_Size</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.PyMapping_Size" title="Permalink to this definition">¶</a></dt> <dt id="c.PyMapping_Length"> Py_ssize_t <code class="descname">PyMapping_Length</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.PyMapping_Length" title="Permalink to this definition">¶</a></dt> <dd><p id="index-0">Returns the number of keys in object <em>o</em> on success, and <code class="docutils literal notranslate"><span class="pre">-1</span></code> on failure. For objects that do not provide mapping protocol, this is equivalent to the Python expression <code class="docutils literal notranslate"><span class="pre">len(o)</span></code>.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>These functions returned an <code class="xref c c-type docutils literal notranslate"><span class="pre">int</span></code> type. This might require changes in your code for properly supporting 64-bit systems.</p> </div> </dd></dl> <dl class="function"> <dt id="c.PyMapping_DelItemString"> int <code class="descname">PyMapping_DelItemString</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, char<em> *key</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMapping_DelItemString" title="Permalink to this definition">¶</a></dt> <dd><p>Remove the mapping for object <em>key</em> from the object <em>o</em>. Return <code class="docutils literal notranslate"><span class="pre">-1</span></code> on failure. This is equivalent to the Python statement <code class="docutils literal notranslate"><span class="pre">del</span> <span class="pre">o[key]</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_DelItem"> int <code class="descname">PyMapping_DelItem</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *key</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMapping_DelItem" title="Permalink to this definition">¶</a></dt> <dd><p>Remove the mapping for object <em>key</em> from the object <em>o</em>. Return <code class="docutils literal notranslate"><span class="pre">-1</span></code> on failure. This is equivalent to the Python statement <code class="docutils literal notranslate"><span class="pre">del</span> <span class="pre">o[key]</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_HasKeyString"> int <code class="descname">PyMapping_HasKeyString</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, char<em> *key</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMapping_HasKeyString" title="Permalink to this definition">¶</a></dt> <dd><p>On success, return <code class="docutils literal notranslate"><span class="pre">1</span></code> if the mapping object has the key <em>key</em> and <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise. This is equivalent to <code class="docutils literal notranslate"><span class="pre">o[key]</span></code>, returning <code class="docutils literal notranslate"><span class="pre">True</span></code> on success and <code class="docutils literal notranslate"><span class="pre">False</span></code> on an exception. This function always succeeds.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_HasKey"> int <code class="descname">PyMapping_HasKey</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *key</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMapping_HasKey" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">1</span></code> if the mapping object has the key <em>key</em> and <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise. This is equivalent to <code class="docutils literal notranslate"><span class="pre">o[key]</span></code>, returning <code class="docutils literal notranslate"><span class="pre">True</span></code> on success and <code class="docutils literal notranslate"><span class="pre">False</span></code> on an exception. This function always succeeds.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_Keys"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyMapping_Keys</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.PyMapping_Keys" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>On success, return a list of the keys in object <em>o</em>. On failure, return <em>NULL</em>. This is equivalent to the Python expression <code class="docutils literal notranslate"><span class="pre">o.keys()</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_Values"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyMapping_Values</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.PyMapping_Values" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>On success, return a list of the values in object <em>o</em>. On failure, return <em>NULL</em>. This is equivalent to the Python expression <code class="docutils literal notranslate"><span class="pre">o.values()</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_Items"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyMapping_Items</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.PyMapping_Items" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>On success, return a list of the items in object <em>o</em>, where each item is a tuple containing a key-value pair. On failure, return <em>NULL</em>. This is equivalent to the Python expression <code class="docutils literal notranslate"><span class="pre">o.items()</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_GetItemString"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyMapping_GetItemString</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, char<em> *key</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMapping_GetItemString" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Return element of <em>o</em> corresponding to the object <em>key</em> or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o[key]</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyMapping_SetItemString"> int <code class="descname">PyMapping_SetItemString</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, char<em> *key</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *v</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMapping_SetItemString" title="Permalink to this definition">¶</a></dt> <dd><p>Map the object <em>key</em> to the value <em>v</em> in object <em>o</em>. Returns <code class="docutils literal notranslate"><span class="pre">-1</span></code> on failure. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o[key]</span> <span class="pre">=</span> <span class="pre">v</span></code>.</p> </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="sequence.html" title="previous chapter">Sequence Protocol</a></p> <h4>Next topic</h4> <p class="topless"><a href="iter.html" title="next chapter">Iterator Protocol</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/c-api/mapping.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="iter.html" title="Iterator Protocol" >next</a> |</li> <li class="right" > <a href="sequence.html" title="Sequence Protocol" >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="abstract.html" >Abstract 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>