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  <div class="section" id="tuple-objects">
<span id="tupleobjects"></span><h1>Tuple Objects<a class="headerlink" href="#tuple-objects" title="Permalink to this headline">¶</a></h1>
<span class="target" id="index-0"></span><dl class="type">
<dt id="PyTupleObject">
<tt class="descname">PyTupleObject</tt><a class="headerlink" href="#PyTupleObject" title="Permalink to this definition">¶</a></dt>
<dd><p>This subtype of <a class="reference internal" href="structures.html#PyObject" title="PyObject"><tt class="xref c c-type docutils literal"><span class="pre">PyObject</span></tt></a> represents a Python tuple object.</p>
</dd></dl>

<dl class="var">
<dt id="PyTuple_Type">
<a class="reference internal" href="type.html#PyTypeObject" title="PyTypeObject">PyTypeObject</a> <tt class="descname">PyTuple_Type</tt><a class="headerlink" href="#PyTuple_Type" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-1">This instance of <a class="reference internal" href="type.html#PyTypeObject" title="PyTypeObject"><tt class="xref c c-type docutils literal"><span class="pre">PyTypeObject</span></tt></a> represents the Python tuple type; it is
the same object as <tt class="docutils literal"><span class="pre">tuple</span></tt> and <tt class="docutils literal"><span class="pre">types.TupleType</span></tt> in the Python layer..</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_Check">
int <tt class="descname">PyTuple_Check</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em><big>)</big><a class="headerlink" href="#PyTuple_Check" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if <em>p</em> is a tuple object or an instance of a subtype of the tuple
type.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.2: </span>Allowed subtypes to be accepted.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_CheckExact">
int <tt class="descname">PyTuple_CheckExact</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em><big>)</big><a class="headerlink" href="#PyTuple_CheckExact" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if <em>p</em> is a tuple object, but not an instance of a subtype of the
tuple type.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_New">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyTuple_New</tt><big>(</big>Py_ssize_t<em>&nbsp;len</em><big>)</big><a class="headerlink" href="#PyTuple_New" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>Return a new tuple object of size <em>len</em>, or <em>NULL</em> on failure.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>len</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_Pack">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyTuple_Pack</tt><big>(</big>Py_ssize_t<em>&nbsp;n</em>, ...<big>)</big><a class="headerlink" href="#PyTuple_Pack" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>Return a new tuple object of size <em>n</em>, or <em>NULL</em> on failure. The tuple values
are initialized to the subsequent <em>n</em> C arguments pointing to Python objects.
<tt class="docutils literal"><span class="pre">PyTuple_Pack(2,</span> <span class="pre">a,</span> <span class="pre">b)</span></tt> is equivalent to <tt class="docutils literal"><span class="pre">Py_BuildValue(&quot;(OO)&quot;,</span> <span class="pre">a,</span> <span class="pre">b)</span></tt>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.4.</span></p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>n</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_Size">
Py_ssize_t <tt class="descname">PyTuple_Size</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em><big>)</big><a class="headerlink" href="#PyTuple_Size" title="Permalink to this definition">¶</a></dt>
<dd><p>Take a pointer to a tuple object, and return the size of that tuple.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function returned an <tt class="xref c c-type 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="function">
<dt id="PyTuple_GET_SIZE">
Py_ssize_t <tt class="descname">PyTuple_GET_SIZE</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em><big>)</big><a class="headerlink" href="#PyTuple_GET_SIZE" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the size of the tuple <em>p</em>, which must be non-<em>NULL</em> and point to a tuple;
no error checking is performed.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function returned an <tt class="xref c c-type 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="function">
<dt id="PyTuple_GetItem">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyTuple_GetItem</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em>, Py_ssize_t<em>&nbsp;pos</em><big>)</big><a class="headerlink" href="#PyTuple_GetItem" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: Borrowed reference.</em><p>Return the object at position <em>pos</em> in the tuple pointed to by <em>p</em>.  If <em>pos</em> is
out of bounds, return <em>NULL</em> and sets an <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> exception.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>pos</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_GET_ITEM">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyTuple_GET_ITEM</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em>, Py_ssize_t<em>&nbsp;pos</em><big>)</big><a class="headerlink" href="#PyTuple_GET_ITEM" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: Borrowed reference.</em><p>Like <a class="reference internal" href="#PyTuple_GetItem" title="PyTuple_GetItem"><tt class="xref c c-func docutils literal"><span class="pre">PyTuple_GetItem()</span></tt></a>, but does no checking of its arguments.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>pos</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_GetSlice">
<a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a>* <tt class="descname">PyTuple_GetSlice</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em>, Py_ssize_t<em>&nbsp;low</em>, Py_ssize_t<em>&nbsp;high</em><big>)</big><a class="headerlink" href="#PyTuple_GetSlice" title="Permalink to this definition">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>Take a slice of the tuple pointed to by <em>p</em> from <em>low</em> to <em>high</em> and return it
as a new tuple.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>low</em> and <em>high</em>. This might
require changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_SetItem">
int <tt class="descname">PyTuple_SetItem</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em>, Py_ssize_t<em>&nbsp;pos</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*o</em><big>)</big><a class="headerlink" href="#PyTuple_SetItem" title="Permalink to this definition">¶</a></dt>
<dd><p>Insert a reference to object <em>o</em> at position <em>pos</em> of the tuple pointed to by
<em>p</em>. Return <tt class="docutils literal"><span class="pre">0</span></tt> on success.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function &#8220;steals&#8221; a reference to <em>o</em>.</p>
</div>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>pos</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_SET_ITEM">
void <tt class="descname">PyTuple_SET_ITEM</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*p</em>, Py_ssize_t<em>&nbsp;pos</em>, <a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;*o</em><big>)</big><a class="headerlink" href="#PyTuple_SET_ITEM" title="Permalink to this definition">¶</a></dt>
<dd><p>Like <a class="reference internal" href="#PyTuple_SetItem" title="PyTuple_SetItem"><tt class="xref c c-func docutils literal"><span class="pre">PyTuple_SetItem()</span></tt></a>, but does no error checking, and should <em>only</em> be
used to fill in brand new tuples.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function &#8220;steals&#8221; a reference to <em>o</em>.</p>
</div>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>pos</em>. This might require
changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="_PyTuple_Resize">
int <tt class="descname">_PyTuple_Resize</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em>&nbsp;**p</em>, Py_ssize_t<em>&nbsp;newsize</em><big>)</big><a class="headerlink" href="#_PyTuple_Resize" title="Permalink to this definition">¶</a></dt>
<dd><p>Can be used to resize a tuple.  <em>newsize</em> will be the new length of the tuple.
Because tuples are <em>supposed</em> to be immutable, this should only be used if there
is only one reference to the object.  Do <em>not</em> use this if the tuple may already
be known to some other part of the code.  The tuple will always grow or shrink
at the end.  Think of this as destroying the old tuple and creating a new one,
only more efficiently.  Returns <tt class="docutils literal"><span class="pre">0</span></tt> on success. Client code should never
assume that the resulting value of <tt class="docutils literal"><span class="pre">*p</span></tt> will be the same as before calling
this function. If the object referenced by <tt class="docutils literal"><span class="pre">*p</span></tt> is replaced, the original
<tt class="docutils literal"><span class="pre">*p</span></tt> is destroyed.  On failure, returns <tt class="docutils literal"><span class="pre">-1</span></tt> and sets <tt class="docutils literal"><span class="pre">*p</span></tt> to <em>NULL</em>, and
raises <a class="reference internal" href="../library/exceptions.html#exceptions.MemoryError" title="exceptions.MemoryError"><tt class="xref py py-exc docutils literal"><span class="pre">MemoryError</span></tt></a> or <a class="reference internal" href="../library/exceptions.html#exceptions.SystemError" title="exceptions.SystemError"><tt class="xref py py-exc docutils literal"><span class="pre">SystemError</span></tt></a>.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.2: </span>Removed unused third parameter, <em>last_is_sticky</em>.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span></tt> type for <em>newsize</em>. This might
require changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>

<dl class="function">
<dt id="PyTuple_ClearFreeList">
int <tt class="descname">PyTuple_ClearFreeList</tt><big>(</big><big>)</big><a class="headerlink" href="#PyTuple_ClearFreeList" title="Permalink to this definition">¶</a></dt>
<dd><p>Clear the free list. Return the total number of freed items.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>

</div>


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