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Code Editor : sequence.html

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 <section id="sequence-protocol">
<h1>Sequence Protocol<a class="headerlink" href="#sequence-protocol" title="Permalink to this headline">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Check">
int PySequence_Check(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_Check" title="Permalink to this definition">¶</a> </dt>
<dd>Return <code class="docutils literal notranslate">1</code> if the object provides sequence protocol, and <code class="docutils literal notranslate">0</code> otherwise.
This function always succeeds.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Size">
Py_ssize_t PySequence_Size(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_Size" title="Permalink to this definition">¶</a> </dt>
<dt class="sig sig-object c" id="c.PySequence_Length">
Py_ssize_t PySequence_Length(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_Length" title="Permalink to this definition">¶</a> </dt>
<dd>Returns the number of objects in sequence o on success, and <code class="docutils literal notranslate">-1</code> on
failure. This is equivalent to the Python expression <code class="docutils literal notranslate">len(o)</code>.
<div class="versionchanged">
Changed in version 2.5: These functions returned an <code class="xref c c-type docutils literal notranslate">int</code> type. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Concat">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_Concat(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o1, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o2)<a class="headerlink" href="#c.PySequence_Concat" title="Permalink to this definition">¶</a> </dt>
<dd>Return the concatenation of o1 and o2 on success, and NULL on failure.
This is the equivalent of the Python expression <code class="docutils literal notranslate">o1 + o2</code>.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Repeat">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_Repeat(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t count)<a class="headerlink" href="#c.PySequence_Repeat" title="Permalink to this definition">¶</a> </dt>
<dd>Return the result of repeating sequence object o count times, or NULL on
failure. This is the equivalent of the Python expression <code class="docutils literal notranslate">o * count</code>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for count. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_InPlaceConcat">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_InPlaceConcat(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o1, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o2)<a class="headerlink" href="#c.PySequence_InPlaceConcat" title="Permalink to this definition">¶</a> </dt>
<dd>Return the concatenation of o1 and o2 on success, and NULL on failure.
The operation is done in-place when o1 supports it. This is the equivalent
of the Python expression <code class="docutils literal notranslate">o1 += o2</code>.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_InPlaceRepeat">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_InPlaceRepeat(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t count)<a class="headerlink" href="#c.PySequence_InPlaceRepeat" title="Permalink to this definition">¶</a> </dt>
<dd>Return the result of repeating sequence object o count times, or NULL on
failure. The operation is done in-place when o supports it. This is the
equivalent of the Python expression <code class="docutils literal notranslate">o *= count</code>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for count. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_GetItem">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_GetItem(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i)<a class="headerlink" href="#c.PySequence_GetItem" title="Permalink to this definition">¶</a> </dt>
<dd>Return the ith element of o, or NULL on failure. This is the equivalent of
the Python expression <code class="docutils literal notranslate">o[i]</code>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_GetSlice">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_GetSlice(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i1, Py_ssize_t i2)<a class="headerlink" href="#c.PySequence_GetSlice" title="Permalink to this definition">¶</a> </dt>
<dd>Return the slice of sequence object o between i1 and i2, or NULL on
failure. This is the equivalent of the Python expression <code class="docutils literal notranslate">o[i1:i2]</code>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i1 and i2. This might
require changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_SetItem">
int PySequence_SetItem(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *v)<a class="headerlink" href="#c.PySequence_SetItem" title="Permalink to this definition">¶</a> </dt>
<dd>Assign object v to the ith element of o. Raise an exception
and return <code class="docutils literal notranslate">-1</code> on failure; return <code class="docutils literal notranslate">0</code> on success. This
is the equivalent of the Python statement <code class="docutils literal notranslate">o[i] = v</code>. This function does
not steal a reference to v.
If v is NULL, the element is deleted, however this feature is
deprecated in favour of using <a class="reference internal" href="#c.PySequence_DelItem" title="PySequence_DelItem"><code class="xref c c-func docutils literal notranslate">PySequence_DelItem()</code></a>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_DelItem">
int PySequence_DelItem(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i)<a class="headerlink" href="#c.PySequence_DelItem" title="Permalink to this definition">¶</a> </dt>
<dd>Delete the ith element of object o. Returns <code class="docutils literal notranslate">-1</code> on failure. This is the
equivalent of the Python statement <code class="docutils literal notranslate">del o[i]</code>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_SetSlice">
int PySequence_SetSlice(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i1, Py_ssize_t i2, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *v)<a class="headerlink" href="#c.PySequence_SetSlice" title="Permalink to this definition">¶</a> </dt>
<dd>Assign the sequence object v to the slice in sequence object o from i1 to
i2. Raise an exception and return <code class="docutils literal notranslate">-1</code> on failure; return <code class="docutils literal notranslate">0</code> on success.
This is the equivalent of the Python statement <code class="docutils literal notranslate">o[i1:i2] = v</code>.
If v is NULL, the slice is deleted, however this feature is
deprecated in favour of using <a class="reference internal" href="#c.PySequence_DelSlice" title="PySequence_DelSlice"><code class="xref c c-func docutils literal notranslate">PySequence_DelSlice()</code></a>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i1 and i2. This might
require changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_DelSlice">
int PySequence_DelSlice(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i1, Py_ssize_t i2)<a class="headerlink" href="#c.PySequence_DelSlice" title="Permalink to this definition">¶</a> </dt>
<dd>Delete the slice in sequence object o from i1 to i2. Returns <code class="docutils literal notranslate">-1</code> on
failure. This is the equivalent of the Python statement <code class="docutils literal notranslate">del o[i1:i2]</code>.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i1 and i2. This might
require changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Count">
Py_ssize_t PySequence_Count(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *value)<a class="headerlink" href="#c.PySequence_Count" title="Permalink to this definition">¶</a> </dt>
<dd>Return the number of occurrences of value in o, that is, return the number
of keys for which <code class="docutils literal notranslate">o[key] == value</code>. On failure, return <code class="docutils literal notranslate">-1</code>. This is
equivalent to the Python expression <code class="docutils literal notranslate">o.count(value)</code>.
<div class="versionchanged">
Changed in version 2.5: This function returned an <code class="xref c c-type docutils literal notranslate">int</code> type. This might require changes
in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Contains">
int PySequence_Contains(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *value)<a class="headerlink" href="#c.PySequence_Contains" title="Permalink to this definition">¶</a> </dt>
<dd>Determine if o contains value. If an item in o is equal to value,
return <code class="docutils literal notranslate">1</code>, otherwise return <code class="docutils literal notranslate">0</code>. On error, return <code class="docutils literal notranslate">-1</code>. This is
equivalent to the Python expression <code class="docutils literal notranslate">value in o</code>.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Index">
Py_ssize_t PySequence_Index(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *value)<a class="headerlink" href="#c.PySequence_Index" title="Permalink to this definition">¶</a> </dt>
<dd>Return the first index i for which <code class="docutils literal notranslate">o[i] == value</code>. On error, return
<code class="docutils literal notranslate">-1</code>. This is equivalent to the Python expression <code class="docutils literal notranslate">o.index(value)</code>.
<div class="versionchanged">
Changed in version 2.5: This function returned an <code class="xref c c-type docutils literal notranslate">int</code> type. This might require changes
in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_List">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_List(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_List" title="Permalink to this definition">¶</a> </dt>
<dd>Return a list object with the same contents as the arbitrary sequence o. The
returned list is guaranteed to be new.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Tuple">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_Tuple(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_Tuple" title="Permalink to this definition">¶</a> </dt>
<dd>Return a tuple object with the same contents as the arbitrary sequence o or
NULL on failure. If o is a tuple, a new reference will be returned,
otherwise a tuple will be constructed with the appropriate contents. This is
equivalent to the Python expression <code class="docutils literal notranslate">tuple(o)</code>.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Fast">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_Fast(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, const char *m)<a class="headerlink" href="#c.PySequence_Fast" title="Permalink to this definition">¶</a> </dt>
<dd>Return the sequence o as a list, unless it is already a tuple or list, in
which case o is returned. Use <a class="reference internal" href="#c.PySequence_Fast_GET_ITEM" title="PySequence_Fast_GET_ITEM"><code class="xref c c-func docutils literal notranslate">PySequence_Fast_GET_ITEM()</code></a> to access
the members of the result. Returns NULL on failure. If the object is not
a sequence, raises <code class="xref py py-exc docutils literal notranslate">TypeError</code> with m as the message text.
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Fast_GET_ITEM">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_Fast_GET_ITEM(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i)<a class="headerlink" href="#c.PySequence_Fast_GET_ITEM" title="Permalink to this definition">¶</a> </dt>
<dd>Return the ith element of o, assuming that o was returned by
<a class="reference internal" href="#c.PySequence_Fast" title="PySequence_Fast"><code class="xref c c-func docutils literal notranslate">PySequence_Fast()</code></a>, o is not NULL, and that i is within bounds.
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Fast_ITEMS">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> **PySequence_Fast_ITEMS(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_Fast_ITEMS" title="Permalink to this definition">¶</a> </dt>
<dd>Return the underlying array of PyObject pointers. Assumes that o was returned
by <a class="reference internal" href="#c.PySequence_Fast" title="PySequence_Fast"><code class="xref c c-func docutils literal notranslate">PySequence_Fast()</code></a> and o is not NULL.
Note, if a list gets resized, the reallocation may relocate the items array.
So, only use the underlying array pointer in contexts where the sequence
cannot change.
<div class="versionadded">
New in version 2.4.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_ITEM">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *PySequence_ITEM(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o, Py_ssize_t i)<a class="headerlink" href="#c.PySequence_ITEM" title="Permalink to this definition">¶</a> </dt>
<dd>Return the ith element of o or NULL on failure. Macro form of
<a class="reference internal" href="#c.PySequence_GetItem" title="PySequence_GetItem"><code class="xref c c-func docutils literal notranslate">PySequence_GetItem()</code></a> but without checking that
<a class="reference internal" href="#c.PySequence_Check" title="PySequence_Check"><code class="xref c c-func docutils literal notranslate">PySequence_Check()</code></a> on o is true and without adjustment for negative
indices.
<div class="versionadded">
New in version 2.3.
</div>
<div class="versionchanged">
Changed in version 2.5: This function used an <code class="xref c c-type docutils literal notranslate">int</code> type for i. This might require
changes in your code for properly supporting 64-bit systems.
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PySequence_Fast_GET_SIZE">
Py_ssize_t PySequence_Fast_GET_SIZE(<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *o)<a class="headerlink" href="#c.PySequence_Fast_GET_SIZE" title="Permalink to this definition">¶</a> </dt>
<dd>Returns the length of o, assuming that o was returned by
<a class="reference internal" href="#c.PySequence_Fast" title="PySequence_Fast"><code class="xref c c-func docutils literal notranslate">PySequence_Fast()</code></a> and that o is not NULL. The size can also be
gotten by calling <a class="reference internal" href="#c.PySequence_Size" title="PySequence_Size"><code class="xref c c-func docutils literal notranslate">PySequence_Size()</code></a> on o, but
<a class="reference internal" href="#c.PySequence_Fast_GET_SIZE" title="PySequence_Fast_GET_SIZE"><code class="xref c c-func docutils literal notranslate">PySequence_Fast_GET_SIZE()</code></a> is faster because it can assume o is a list
or tuple.
</dd></dl>

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