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/usr/share/doc/python2-docs/html/c-api/slice.html
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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>Slice Objects — 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="Weak Reference Objects" href="weakref.html" /> <link rel="prev" title="Descriptor Objects" href="descriptor.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/c-api/slice.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="weakref.html" title="Weak Reference Objects" accesskey="N">next</a> |</li> <li class="right" > <a href="descriptor.html" title="Descriptor Objects" 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="concrete.html" accesskey="U">Concrete Objects Layer</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="slice-objects"> <span id="id1"></span><h1>Slice Objects<a class="headerlink" href="#slice-objects" title="Permalink to this headline">¶</a></h1> <dl class="var"> <dt id="c.PySlice_Type"> <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="descname">PySlice_Type</code><a class="headerlink" href="#c.PySlice_Type" title="Permalink to this definition">¶</a></dt> <dd><p id="index-0">The type object for slice objects. This is the same as <code class="docutils literal notranslate"><span class="pre">slice</span></code> and <code class="docutils literal notranslate"><span class="pre">types.SliceType</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PySlice_Check"> int <code class="descname">PySlice_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *ob</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_Check" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if <em>ob</em> is a slice object; <em>ob</em> must not be <em>NULL</em>.</p> </dd></dl> <dl class="function"> <dt id="c.PySlice_New"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PySlice_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *start</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *stop</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *step</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_New" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Return a new slice object with the given values. The <em>start</em>, <em>stop</em>, and <em>step</em> parameters are used as the values of the slice object attributes of the same names. Any of the values may be <em>NULL</em>, in which case the <code class="docutils literal notranslate"><span class="pre">None</span></code> will be used for the corresponding attribute. Return <em>NULL</em> if the new object could not be allocated.</p> </dd></dl> <dl class="function"> <dt id="c.PySlice_GetIndices"> int <code class="descname">PySlice_GetIndices</code><span class="sig-paren">(</span>PySliceObject<em> *slice</em>, Py_ssize_t<em> length</em>, Py_ssize_t<em> *start</em>, Py_ssize_t<em> *stop</em>, Py_ssize_t<em> *step</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_GetIndices" title="Permalink to this definition">¶</a></dt> <dd><p>Retrieve the start, stop and step indices from the slice object <em>slice</em>, assuming a sequence of length <em>length</em>. Treats indices greater than <em>length</em> as errors.</p> <p>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> on error with no exception set (unless one of the indices was not <a class="reference internal" href="../library/constants.html#None" title="None"><code class="xref py py-const docutils literal notranslate"><span class="pre">None</span></code></a> and failed to be converted to an integer, in which case <code class="docutils literal notranslate"><span class="pre">-1</span></code> is returned with an exception set).</p> <p>You probably do not want to use this function. If you want to use slice objects in versions of Python prior to 2.3, you would probably do well to incorporate the source of <a class="reference internal" href="#c.PySlice_GetIndicesEx" title="PySlice_GetIndicesEx"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_GetIndicesEx()</span></code></a>, suitably renamed, in the source of your extension.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>This function used an <code class="xref c c-type docutils literal notranslate"><span class="pre">int</span></code> type for <em>length</em> and an <code class="xref c c-type docutils literal notranslate"><span class="pre">int</span> <span class="pre">*</span></code> type for <em>start</em>, <em>stop</em>, and <em>step</em>. This might require changes in your code for properly supporting 64-bit systems.</p> </div> </dd></dl> <dl class="function"> <dt id="c.PySlice_GetIndicesEx"> int <code class="descname">PySlice_GetIndicesEx</code><span class="sig-paren">(</span>PySliceObject<em> *slice</em>, Py_ssize_t<em> length</em>, Py_ssize_t<em> *start</em>, Py_ssize_t<em> *stop</em>, Py_ssize_t<em> *step</em>, Py_ssize_t<em> *slicelength</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_GetIndicesEx" title="Permalink to this definition">¶</a></dt> <dd><p>Usable replacement for <a class="reference internal" href="#c.PySlice_GetIndices" title="PySlice_GetIndices"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_GetIndices()</span></code></a>. Retrieve the start, stop, and step indices from the slice object <em>slice</em> assuming a sequence of length <em>length</em>, and store the length of the slice in <em>slicelength</em>. Out of bounds indices are clipped in a manner consistent with the handling of normal slices.</p> <p>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> on error with exception set.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.3.</span></p> </div> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>This function used an <code class="xref c c-type docutils literal notranslate"><span class="pre">int</span></code> type for <em>length</em> and an <code class="xref c c-type docutils literal notranslate"><span class="pre">int</span> <span class="pre">*</span></code> type for <em>start</em>, <em>stop</em>, <em>step</em>, and <em>slicelength</em>. This might require changes in your code for properly supporting 64-bit systems.</p> </div> </dd></dl> </div> <div class="section" id="ellipsis-object"> <h1>Ellipsis Object<a class="headerlink" href="#ellipsis-object" title="Permalink to this headline">¶</a></h1> <dl class="var"> <dt id="c.Py_Ellipsis"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *<code class="descname">Py_Ellipsis</code><a class="headerlink" href="#c.Py_Ellipsis" title="Permalink to this definition">¶</a></dt> <dd><p>The Python <code class="docutils literal notranslate"><span class="pre">Ellipsis</span></code> object. This object has no methods. It needs to be treated just like any other object with respect to reference counts. Like <a class="reference internal" href="none.html#c.Py_None" title="Py_None"><code class="xref c c-data docutils literal notranslate"><span class="pre">Py_None</span></code></a> it is a singleton object.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">Slice Objects</a></li> <li><a class="reference internal" href="#ellipsis-object">Ellipsis Object</a></li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="descriptor.html" title="previous chapter">Descriptor Objects</a></p> <h4>Next topic</h4> <p class="topless"><a href="weakref.html" title="next chapter">Weak Reference Objects</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/c-api/slice.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="weakref.html" title="Weak Reference Objects" >next</a> |</li> <li class="right" > <a href="descriptor.html" title="Descriptor Objects" >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="concrete.html" >Concrete 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>
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