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  <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="cfunction">
<dt id="PyMapping_Check">
int <tt class="descname">PyMapping_Check</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#PyMapping_Check" title="Permalink to this definition">¶</a></dt>
<dd>Return <tt class="docutils literal"><span class="pre">1</span></tt> if the object provides mapping protocol, and <tt class="docutils literal"><span class="pre">0</span></tt> otherwise.  This
function always succeeds.</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_Size">
Py_ssize_t <tt class="descname">PyMapping_Size</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#PyMapping_Size" title="Permalink to this definition">¶</a></dt>
<dt id="PyMapping_Length">
Py_ssize_t <tt class="descname">PyMapping_Length</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#PyMapping_Length" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-105">Returns the number of keys in object <em>o</em> on success, and <tt class="docutils literal"><span class="pre">-1</span></tt> on failure.  For
objects that do not provide mapping protocol, this is equivalent to the Python
expression <tt class="docutils literal"><span class="pre">len(o)</span></tt>.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>These functions returned an <tt class="xref docutils literal"><span class="pre">int</span></tt> type. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_DelItemString">
int <tt class="descname">PyMapping_DelItemString</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, char<em> *key</em><big>)</big><a class="headerlink" href="#PyMapping_DelItemString" title="Permalink to this definition">¶</a></dt>
<dd>Remove the mapping for object <em>key</em> from the object <em>o</em>. Return <tt class="docutils literal"><span class="pre">-1</span></tt> on
failure.  This is equivalent to the Python statement <tt class="docutils literal"><span class="pre">del</span> <span class="pre">o[key]</span></tt>.</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_DelItem">
int <tt class="descname">PyMapping_DelItem</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *key</em><big>)</big><a class="headerlink" href="#PyMapping_DelItem" title="Permalink to this definition">¶</a></dt>
<dd>Remove the mapping for object <em>key</em> from the object <em>o</em>. Return <tt class="docutils literal"><span class="pre">-1</span></tt> on
failure.  This is equivalent to the Python statement <tt class="docutils literal"><span class="pre">del</span> <span class="pre">o[key]</span></tt>.</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_HasKeyString">
int <tt class="descname">PyMapping_HasKeyString</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, char<em> *key</em><big>)</big><a class="headerlink" href="#PyMapping_HasKeyString" title="Permalink to this definition">¶</a></dt>
<dd>On success, return <tt class="docutils literal"><span class="pre">1</span></tt> if the mapping object has the key <em>key</em> and <tt class="docutils literal"><span class="pre">0</span></tt>
otherwise.  This is equivalent to <tt class="docutils literal"><span class="pre">o[key]</span></tt>, returning <tt class="xref docutils literal"><span class="pre">True</span></tt> on success
and <tt class="xref docutils literal"><span class="pre">False</span></tt> on an exception.  This function always succeeds.</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_HasKey">
int <tt class="descname">PyMapping_HasKey</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *key</em><big>)</big><a class="headerlink" href="#PyMapping_HasKey" title="Permalink to this definition">¶</a></dt>
<dd>Return <tt class="docutils literal"><span class="pre">1</span></tt> if the mapping object has the key <em>key</em> and <tt class="docutils literal"><span class="pre">0</span></tt> otherwise.
This is equivalent to <tt class="docutils literal"><span class="pre">o[key]</span></tt>, returning <tt class="xref docutils literal"><span class="pre">True</span></tt> on success and <tt class="xref docutils literal"><span class="pre">False</span></tt>
on an exception.  This function always succeeds.</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_Keys">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyMapping_Keys</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#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 <tt class="docutils literal"><span class="pre">o.keys()</span></tt>.</p>
</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_Values">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyMapping_Values</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#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 <tt class="docutils literal"><span class="pre">o.values()</span></tt>.</p>
</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_Items">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyMapping_Items</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#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 <tt class="docutils literal"><span class="pre">o.items()</span></tt>.</p>
</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_GetItemString">
<a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyMapping_GetItemString</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, char<em> *key</em><big>)</big><a class="headerlink" href="#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 <tt class="docutils literal"><span class="pre">o[key]</span></tt>.</p>
</dd></dl>

<dl class="cfunction">
<dt id="PyMapping_SetItemString">
int <tt class="descname">PyMapping_SetItemString</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *o</em>, char<em> *key</em>, <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *v</em><big>)</big><a class="headerlink" href="#PyMapping_SetItemString" title="Permalink to this definition">¶</a></dt>
<dd>Map the object <em>key</em> to the value <em>v</em> in object <em>o</em>. Returns <tt class="docutils literal"><span class="pre">-1</span></tt> on failure.
This is the equivalent of the Python statement <tt class="docutils literal"><span class="pre">o[key]</span> <span class="pre">=</span> <span class="pre">v</span></tt>.</dd></dl>

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