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  <section id="tuple-objects">
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<span id="tupleobjects"></span><h1>Tuple Objects<a class="headerlink" href="#tuple-objects" title="Link to this heading">¶</a></h1>
 | 
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<dl class="c type" id="index-0">
 | 
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<dt class="sig sig-object c" id="c.PyTupleObject">
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<span class="k"><span class="pre">type</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTupleObject</span></span></span><a class="headerlink" href="#c.PyTupleObject" title="Link to this definition">¶</a><br /></dt>
 | 
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<dd><p>This subtype of <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyObject</span></code></a> represents a Python tuple object.</p>
 | 
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</dd></dl>
 | 
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<dl class="c var">
 | 
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<dt class="sig sig-object c" id="c.PyTuple_Type">
 | 
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<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_Type</span></span></span><a class="headerlink" href="#c.PyTuple_Type" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>This instance of <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyTypeObject</span></code></a> represents the Python tuple type; it
 | 
						|
is the same object as <a class="reference internal" href="../library/stdtypes.html#tuple" title="tuple"><code class="xref py py-class docutils literal notranslate"><span class="pre">tuple</span></code></a> in the Python layer.</p>
 | 
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</dd></dl>
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<dl class="c function">
 | 
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<dt class="sig sig-object c" id="c.PyTuple_Check">
 | 
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<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_Check" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Return true if <em>p</em> is a tuple object or an instance of a subtype of the
 | 
						|
tuple type.  This function always succeeds.</p>
 | 
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</dd></dl>
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<dl class="c function">
 | 
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<dt class="sig sig-object c" id="c.PyTuple_CheckExact">
 | 
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<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_CheckExact</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_CheckExact" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Return true if <em>p</em> is a tuple object, but not an instance of a subtype of the
 | 
						|
tuple type.  This function always succeeds.</p>
 | 
						|
</dd></dl>
 | 
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 | 
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<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_New">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">len</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_New" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return a new tuple object of size <em>len</em>,
 | 
						|
or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an exception set on failure.</p>
 | 
						|
</dd></dl>
 | 
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 | 
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<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_Pack">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_Pack</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">n</span></span>, <span class="p"><span class="pre">...</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_Pack" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return a new tuple object of size <em>n</em>,
 | 
						|
or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an exception set on failure. The tuple values
 | 
						|
are initialized to the subsequent <em>n</em> C arguments pointing to Python objects.
 | 
						|
<code class="docutils literal notranslate"><span class="pre">PyTuple_Pack(2,</span> <span class="pre">a,</span> <span class="pre">b)</span></code> is equivalent to <code class="docutils literal notranslate"><span class="pre">Py_BuildValue("(OO)",</span> <span class="pre">a,</span> <span class="pre">b)</span></code>.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_Size">
 | 
						|
<a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_Size</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_Size" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Take a pointer to a tuple object, and return the size of that tuple.
 | 
						|
On error, return <code class="docutils literal notranslate"><span class="pre">-1</span></code> and with an exception set.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_GET_SIZE">
 | 
						|
<a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_GET_SIZE</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_GET_SIZE" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Like <a class="reference internal" href="#c.PyTuple_Size" title="PyTuple_Size"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyTuple_Size()</span></code></a>, but without error checking.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_GetItem">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_GetItem</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_GetItem" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_borrowed_ref">Return value: Borrowed reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return the object at position <em>pos</em> in the tuple pointed to by <em>p</em>.  If <em>pos</em> is
 | 
						|
negative or out of bounds, return <code class="docutils literal notranslate"><span class="pre">NULL</span></code> and set an <a class="reference internal" href="../library/exceptions.html#IndexError" title="IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a> exception.</p>
 | 
						|
<p>The returned reference is borrowed from the tuple <em>p</em>
 | 
						|
(that is: it is only valid as long as you hold a reference to <em>p</em>).
 | 
						|
To get a <a class="reference internal" href="../glossary.html#term-strong-reference"><span class="xref std std-term">strong reference</span></a>, use
 | 
						|
<a class="reference internal" href="refcounting.html#c.Py_NewRef" title="Py_NewRef"><code class="xref c c-func docutils literal notranslate"><span class="pre">Py_NewRef(PyTuple_GetItem(...))</span></code></a>
 | 
						|
or <a class="reference internal" href="sequence.html#c.PySequence_GetItem" title="PySequence_GetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySequence_GetItem()</span></code></a>.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_GET_ITEM">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_GET_ITEM</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_GET_ITEM" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_borrowed_ref">Return value: Borrowed reference.</em><p>Like <a class="reference internal" href="#c.PyTuple_GetItem" title="PyTuple_GetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyTuple_GetItem()</span></code></a>, but does no checking of its arguments.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_GetSlice">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_GetSlice</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">low</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">high</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_GetSlice" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return the slice of the tuple pointed to by <em>p</em> between <em>low</em> and <em>high</em>,
 | 
						|
or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an exception set on failure.</p>
 | 
						|
<p>This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">p[low:high]</span></code>.
 | 
						|
Indexing from the end of the tuple is not supported.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_SetItem">
 | 
						|
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_SetItem</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">o</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_SetItem" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Insert a reference to object <em>o</em> at position <em>pos</em> of the tuple pointed to by
 | 
						|
<em>p</em>.  Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success.  If <em>pos</em> is out of bounds, return <code class="docutils literal notranslate"><span class="pre">-1</span></code>
 | 
						|
and set an <a class="reference internal" href="../library/exceptions.html#IndexError" title="IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a> exception.</p>
 | 
						|
<div class="admonition note">
 | 
						|
<p class="admonition-title">Note</p>
 | 
						|
<p>This function “steals” a reference to <em>o</em> and discards a reference to
 | 
						|
an item already in the tuple at the affected position.</p>
 | 
						|
</div>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyTuple_SET_ITEM">
 | 
						|
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyTuple_SET_ITEM</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">o</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyTuple_SET_ITEM" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Like <a class="reference internal" href="#c.PyTuple_SetItem" title="PyTuple_SetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyTuple_SetItem()</span></code></a>, but does no error checking, and should <em>only</em> be
 | 
						|
used to fill in brand new tuples.</p>
 | 
						|
<p>Bounds checking is performed as an assertion if Python is built in
 | 
						|
<a class="reference internal" href="../using/configure.html#debug-build"><span class="std std-ref">debug mode</span></a> or <a class="reference internal" href="../using/configure.html#cmdoption-with-assertions"><code class="xref std std-option docutils literal notranslate"><span class="pre">with</span> <span class="pre">assertions</span></code></a>.</p>
 | 
						|
<div class="admonition note">
 | 
						|
<p class="admonition-title">Note</p>
 | 
						|
<p>This function “steals” a reference to <em>o</em>, and, unlike
 | 
						|
<a class="reference internal" href="#c.PyTuple_SetItem" title="PyTuple_SetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyTuple_SetItem()</span></code></a>, does <em>not</em> discard a reference to any item that
 | 
						|
is being replaced; any reference in the tuple at position <em>pos</em> will be
 | 
						|
leaked.</p>
 | 
						|
</div>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c._PyTuple_Resize">
 | 
						|
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">_PyTuple_Resize</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">newsize</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c._PyTuple_Resize" title="Link to this definition">¶</a><br /></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 <code class="docutils literal notranslate"><span class="pre">0</span></code> on success. Client code should never
 | 
						|
assume that the resulting value of <code class="docutils literal notranslate"><span class="pre">*p</span></code> will be the same as before calling
 | 
						|
this function. If the object referenced by <code class="docutils literal notranslate"><span class="pre">*p</span></code> is replaced, the original
 | 
						|
<code class="docutils literal notranslate"><span class="pre">*p</span></code> is destroyed.  On failure, returns <code class="docutils literal notranslate"><span class="pre">-1</span></code> and sets <code class="docutils literal notranslate"><span class="pre">*p</span></code> to <code class="docutils literal notranslate"><span class="pre">NULL</span></code>, and
 | 
						|
raises <a class="reference internal" href="../library/exceptions.html#MemoryError" title="MemoryError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MemoryError</span></code></a> or <a class="reference internal" href="../library/exceptions.html#SystemError" title="SystemError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SystemError</span></code></a>.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
</section>
 | 
						|
<section id="struct-sequence-objects">
 | 
						|
<span id="id1"></span><h1>Struct Sequence Objects<a class="headerlink" href="#struct-sequence-objects" title="Link to this heading">¶</a></h1>
 | 
						|
<p>Struct sequence objects are the C equivalent of <a class="reference internal" href="../library/collections.html#collections.namedtuple" title="collections.namedtuple"><code class="xref py py-func docutils literal notranslate"><span class="pre">namedtuple()</span></code></a>
 | 
						|
objects, i.e. a sequence whose items can also be accessed through attributes.
 | 
						|
To create a struct sequence, you first have to create a specific struct sequence
 | 
						|
type.</p>
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_NewType">
 | 
						|
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_NewType</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="#c.PyStructSequence_Desc" title="PyStructSequence_Desc"><span class="n"><span class="pre">PyStructSequence_Desc</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">desc</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_NewType" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Create a new struct sequence type from the data in <em>desc</em>, described below. Instances
 | 
						|
of the resulting type can be created with <a class="reference internal" href="#c.PyStructSequence_New" title="PyStructSequence_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_New()</span></code></a>.</p>
 | 
						|
<p>Return <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an exception set on failure.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_InitType">
 | 
						|
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_InitType</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <a class="reference internal" href="#c.PyStructSequence_Desc" title="PyStructSequence_Desc"><span class="n"><span class="pre">PyStructSequence_Desc</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">desc</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_InitType" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Initializes a struct sequence type <em>type</em> from <em>desc</em> in place.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_InitType2">
 | 
						|
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_InitType2</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <a class="reference internal" href="#c.PyStructSequence_Desc" title="PyStructSequence_Desc"><span class="n"><span class="pre">PyStructSequence_Desc</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">desc</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_InitType2" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Like <a class="reference internal" href="#c.PyStructSequence_InitType" title="PyStructSequence_InitType"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_InitType()</span></code></a>, but returns <code class="docutils literal notranslate"><span class="pre">0</span></code> on success
 | 
						|
and <code class="docutils literal notranslate"><span class="pre">-1</span></code> with an exception set on failure.</p>
 | 
						|
<div class="versionadded">
 | 
						|
<p><span class="versionmodified added">Added in version 3.4.</span></p>
 | 
						|
</div>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c type">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Desc">
 | 
						|
<span class="k"><span class="pre">type</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_Desc</span></span></span><a class="headerlink" href="#c.PyStructSequence_Desc" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> (including all members).</em><p>Contains the meta information of a struct sequence type to create.</p>
 | 
						|
<dl class="c member">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Desc.name">
 | 
						|
<span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">name</span></span></span><a class="headerlink" href="#c.PyStructSequence_Desc.name" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Fully qualified name of the type; null-terminated UTF-8 encoded.
 | 
						|
The name must contain the module name.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c member">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Desc.doc">
 | 
						|
<span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">doc</span></span></span><a class="headerlink" href="#c.PyStructSequence_Desc.doc" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Pointer to docstring for the type or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> to omit.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c member">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Desc.fields">
 | 
						|
<a class="reference internal" href="#c.PyStructSequence_Field" title="PyStructSequence_Field"><span class="n"><span class="pre">PyStructSequence_Field</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">fields</span></span></span><a class="headerlink" href="#c.PyStructSequence_Desc.fields" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Pointer to <code class="docutils literal notranslate"><span class="pre">NULL</span></code>-terminated array with field names of the new type.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c member">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Desc.n_in_sequence">
 | 
						|
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">n_in_sequence</span></span></span><a class="headerlink" href="#c.PyStructSequence_Desc.n_in_sequence" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Number of fields visible to the Python side (if used as tuple).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c type">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Field">
 | 
						|
<span class="k"><span class="pre">type</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_Field</span></span></span><a class="headerlink" href="#c.PyStructSequence_Field" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> (including all members).</em><p>Describes a field of a struct sequence. As a struct sequence is modeled as a
 | 
						|
tuple, all fields are typed as <span class="c-expr sig sig-inline c"><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n">PyObject</span></a><span class="p">*</span></span>.  The index in the
 | 
						|
<a class="reference internal" href="#c.PyStructSequence_Desc.fields" title="PyStructSequence_Desc.fields"><code class="xref c c-member docutils literal notranslate"><span class="pre">fields</span></code></a> array of
 | 
						|
the <a class="reference internal" href="#c.PyStructSequence_Desc" title="PyStructSequence_Desc"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyStructSequence_Desc</span></code></a> determines which
 | 
						|
field of the struct sequence is described.</p>
 | 
						|
<dl class="c member">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Field.name">
 | 
						|
<span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">name</span></span></span><a class="headerlink" href="#c.PyStructSequence_Field.name" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Name for the field or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> to end the list of named fields,
 | 
						|
set to <a class="reference internal" href="#c.PyStructSequence_UnnamedField" title="PyStructSequence_UnnamedField"><code class="xref c c-data docutils literal notranslate"><span class="pre">PyStructSequence_UnnamedField</span></code></a> to leave unnamed.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c member">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_Field.doc">
 | 
						|
<span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">doc</span></span></span><a class="headerlink" href="#c.PyStructSequence_Field.doc" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Field docstring or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> to omit.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c var">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_UnnamedField">
 | 
						|
<span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_UnnamedField</span></span></span><a class="headerlink" href="#c.PyStructSequence_UnnamedField" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> since version 3.11.</em><p>Special value for a field name to leave it unnamed.</p>
 | 
						|
<div class="versionchanged">
 | 
						|
<p><span class="versionmodified changed">Changed in version 3.9: </span>The type was changed from <code class="docutils literal notranslate"><span class="pre">char</span> <span class="pre">*</span></code>.</p>
 | 
						|
</div>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_New">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_New" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_new_ref">Return value: New reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Creates an instance of <em>type</em>, which must have been created with
 | 
						|
<a class="reference internal" href="#c.PyStructSequence_NewType" title="PyStructSequence_NewType"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_NewType()</span></code></a>.</p>
 | 
						|
<p>Return <code class="docutils literal notranslate"><span class="pre">NULL</span></code> with an exception set on failure.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_GetItem">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_GetItem</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_GetItem" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_borrowed_ref">Return value: Borrowed reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Return the object at position <em>pos</em> in the struct sequence pointed to by <em>p</em>.</p>
 | 
						|
<p>Bounds checking is performed as an assertion if Python is built in
 | 
						|
<a class="reference internal" href="../using/configure.html#debug-build"><span class="std std-ref">debug mode</span></a> or <a class="reference internal" href="../using/configure.html#cmdoption-with-assertions"><code class="xref std std-option docutils literal notranslate"><span class="pre">with</span> <span class="pre">assertions</span></code></a>.</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_GET_ITEM">
 | 
						|
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_GET_ITEM</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_GET_ITEM" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="refcount return_borrowed_ref">Return value: Borrowed reference.</em><p>Alias to <a class="reference internal" href="#c.PyStructSequence_GetItem" title="PyStructSequence_GetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_GetItem()</span></code></a>.</p>
 | 
						|
<div class="versionchanged">
 | 
						|
<p><span class="versionmodified changed">Changed in version 3.13: </span>Now implemented as an alias to <a class="reference internal" href="#c.PyStructSequence_GetItem" title="PyStructSequence_GetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_GetItem()</span></code></a>.</p>
 | 
						|
</div>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_SetItem">
 | 
						|
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_SetItem</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">pos</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">o</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_SetItem" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Sets the field at index <em>pos</em> of the struct sequence <em>p</em> to value <em>o</em>.  Like
 | 
						|
<a class="reference internal" href="#c.PyTuple_SET_ITEM" title="PyTuple_SET_ITEM"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyTuple_SET_ITEM()</span></code></a>, this should only be used to fill in brand new
 | 
						|
instances.</p>
 | 
						|
<p>Bounds checking is performed as an assertion if Python is built in
 | 
						|
<a class="reference internal" href="../using/configure.html#debug-build"><span class="std std-ref">debug mode</span></a> or <a class="reference internal" href="../using/configure.html#cmdoption-with-assertions"><code class="xref std std-option docutils literal notranslate"><span class="pre">with</span> <span class="pre">assertions</span></code></a>.</p>
 | 
						|
<div class="admonition note">
 | 
						|
<p class="admonition-title">Note</p>
 | 
						|
<p>This function “steals” a reference to <em>o</em>.</p>
 | 
						|
</div>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="c function">
 | 
						|
<dt class="sig sig-object c" id="c.PyStructSequence_SET_ITEM">
 | 
						|
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyStructSequence_SET_ITEM</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">p</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">pos</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">o</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyStructSequence_SET_ITEM" title="Link to this definition">¶</a><br /></dt>
 | 
						|
<dd><p>Alias to <a class="reference internal" href="#c.PyStructSequence_SetItem" title="PyStructSequence_SetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_SetItem()</span></code></a>.</p>
 | 
						|
<div class="versionchanged">
 | 
						|
<p><span class="versionmodified changed">Changed in version 3.13: </span>Now implemented as an alias to <a class="reference internal" href="#c.PyStructSequence_SetItem" title="PyStructSequence_SetItem"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyStructSequence_SetItem()</span></code></a>.</p>
 | 
						|
</div>
 | 
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