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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>Number Protocol — Python 3.6.7 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.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 3.6.7 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="Sequence Protocol" href="sequence.html" /> <link rel="prev" title="Object Protocol" href="object.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/c-api/number.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="sequence.html" title="Sequence Protocol" accesskey="N">next</a> |</li> <li class="right" > <a href="object.html" title="Object Protocol" 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">3.6.7 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="abstract.html" accesskey="U">Abstract Objects Layer</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" 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> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="number-protocol"> <span id="number"></span><h1>Number Protocol<a class="headerlink" href="#number-protocol" title="Permalink to this headline">ยถ</a></h1> <dl class="function"> <dt id="c.PyNumber_Check"> int <code class="descname">PyNumber_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Check" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns <code class="docutils literal notranslate"><span class="pre">1</span></code> if the object <em>o</em> provides numeric protocols, and false otherwise. This function always succeeds.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Add"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Add</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Add" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of adding <em>o1</em> and <em>o2</em>, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">+</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Subtract"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Subtract</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Subtract" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of subtracting <em>o2</em> from <em>o1</em>, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">-</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Multiply"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Multiply</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Multiply" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of multiplying <em>o1</em> and <em>o2</em>, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">*</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_MatrixMultiply"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_MatrixMultiply</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_MatrixMultiply" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns the result of matrix multiplication on <em>o1</em> and <em>o2</em>, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">@</span> <span class="pre">o2</span></code>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> </dd></dl> <dl class="function"> <dt id="c.PyNumber_FloorDivide"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_FloorDivide</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_FloorDivide" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Return the floor of <em>o1</em> divided by <em>o2</em>, or <em>NULL</em> on failure. This is equivalent to the โclassicโ division of integers.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_TrueDivide"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_TrueDivide</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_TrueDivide" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Return a reasonable approximation for the mathematical value of <em>o1</em> divided by <em>o2</em>, or <em>NULL</em> on failure. The return value is โapproximateโ because binary floating point numbers are approximate; it is not possible to represent all real numbers in base two. This function can return a floating point value when passed two integers.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Remainder"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Remainder</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Remainder" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the remainder of dividing <em>o1</em> by <em>o2</em>, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">%</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Divmod"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Divmod</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Divmod" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-0">See the built-in function <a class="reference internal" href="../library/functions.html#divmod" title="divmod"><code class="xref py py-func docutils literal notranslate"><span class="pre">divmod()</span></code></a>. Returns <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">divmod(o1,</span> <span class="pre">o2)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Power"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Power</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o3</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Power" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-1">See the built-in function <a class="reference internal" href="../library/functions.html#pow" title="pow"><code class="xref py py-func docutils literal notranslate"><span class="pre">pow()</span></code></a>. Returns <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">pow(o1,</span> <span class="pre">o2,</span> <span class="pre">o3)</span></code>, where <em>o3</em> is optional. If <em>o3</em> is to be ignored, pass <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> in its place (passing <em>NULL</em> for <em>o3</em> would cause an illegal memory access).</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Negative"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Negative</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Negative" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the negation of <em>o</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">-o</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Positive"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Positive</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Positive" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns <em>o</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">+o</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Absolute"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Absolute</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Absolute" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-2">Returns the absolute value of <em>o</em>, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">abs(o)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Invert"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Invert</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Invert" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the bitwise negation of <em>o</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">~o</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Lshift"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Lshift</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Lshift" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of left shifting <em>o1</em> by <em>o2</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre"><<</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Rshift"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Rshift</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Rshift" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of right shifting <em>o1</em> by <em>o2</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">>></span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_And"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_And</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_And" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the โbitwise andโ of <em>o1</em> and <em>o2</em> on success and <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">&</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Xor"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Xor</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Xor" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the โbitwise exclusive orโ of <em>o1</em> by <em>o2</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">^</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Or"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Or</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Or" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the โbitwise orโ of <em>o1</em> and <em>o2</em> on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">|</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceAdd"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceAdd</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceAdd" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of adding <em>o1</em> and <em>o2</em>, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">+=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceSubtract"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceSubtract</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceSubtract" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of subtracting <em>o2</em> from <em>o1</em>, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">-=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceMultiply"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceMultiply</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceMultiply" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of multiplying <em>o1</em> and <em>o2</em>, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">*=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceMatrixMultiply"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceMatrixMultiply</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceMatrixMultiply" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns the result of matrix multiplication on <em>o1</em> and <em>o2</em>, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">@=</span> <span class="pre">o2</span></code>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceFloorDivide"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceFloorDivide</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceFloorDivide" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the mathematical floor of dividing <em>o1</em> by <em>o2</em>, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">//=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceTrueDivide"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceTrueDivide</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceTrueDivide" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Return a reasonable approximation for the mathematical value of <em>o1</em> divided by <em>o2</em>, or <em>NULL</em> on failure. The return value is โapproximateโ because binary floating point numbers are approximate; it is not possible to represent all real numbers in base two. This function can return a floating point value when passed two integers. The operation is done <em>in-place</em> when <em>o1</em> supports it.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceRemainder"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceRemainder</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceRemainder" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the remainder of dividing <em>o1</em> by <em>o2</em>, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">%=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlacePower"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlacePower</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o3</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlacePower" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-3">See the built-in function <a class="reference internal" href="../library/functions.html#pow" title="pow"><code class="xref py py-func docutils literal notranslate"><span class="pre">pow()</span></code></a>. Returns <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">**=</span> <span class="pre">o2</span></code> when o3 is <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>, or an in-place variant of <code class="docutils literal notranslate"><span class="pre">pow(o1,</span> <span class="pre">o2,</span> <span class="pre">o3)</span></code> otherwise. If <em>o3</em> is to be ignored, pass <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> in its place (passing <em>NULL</em> for <em>o3</em> would cause an illegal memory access).</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceLshift"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceLshift</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceLshift" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of left shifting <em>o1</em> by <em>o2</em> on success, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre"><<=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceRshift"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceRshift</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceRshift" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the result of right shifting <em>o1</em> by <em>o2</em> on success, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">>>=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceAnd"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceAnd</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceAnd" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the โbitwise andโ of <em>o1</em> and <em>o2</em> on success and <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">&=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceXor"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceXor</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceXor" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the โbitwise exclusive orโ of <em>o1</em> by <em>o2</em> on success, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">^=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_InPlaceOr"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_InPlaceOr</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o1</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o2</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_InPlaceOr" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Returns the โbitwise orโ of <em>o1</em> and <em>o2</em> on success, or <em>NULL</em> on failure. The operation is done <em>in-place</em> when <em>o1</em> supports it. This is the equivalent of the Python statement <code class="docutils literal notranslate"><span class="pre">o1</span> <span class="pre">|=</span> <span class="pre">o2</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Long"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Long</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Long" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-4">Returns the <em>o</em> converted to an integer object on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">int(o)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Float"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Float</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Float" title="Permalink to this definition">ยถ</a></dt> <dd><em class="refcount">Return value: New reference.</em><p id="index-5">Returns the <em>o</em> converted to a float object on success, or <em>NULL</em> on failure. This is the equivalent of the Python expression <code class="docutils literal notranslate"><span class="pre">float(o)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_Index"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_Index</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_Index" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns the <em>o</em> converted to a Python int on success or <em>NULL</em> with a <a class="reference internal" href="../library/exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> exception raised on failure.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_ToBase"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyNumber_ToBase</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *n</em>, int<em> base</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_ToBase" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns the integer <em>n</em> converted to base <em>base</em> as a string. The <em>base</em> argument must be one of 2, 8, 10, or 16. For base 2, 8, or 16, the returned string is prefixed with a base marker of <code class="docutils literal notranslate"><span class="pre">'0b'</span></code>, <code class="docutils literal notranslate"><span class="pre">'0o'</span></code>, or <code class="docutils literal notranslate"><span class="pre">'0x'</span></code>, respectively. If <em>n</em> is not a Python int, it is converted with <a class="reference internal" href="#c.PyNumber_Index" title="PyNumber_Index"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyNumber_Index()</span></code></a> first.</p> </dd></dl> <dl class="function"> <dt id="c.PyNumber_AsSsize_t"> Py_ssize_t <code class="descname">PyNumber_AsSsize_t</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *exc</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyNumber_AsSsize_t" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns <em>o</em> converted to a Py_ssize_t value if <em>o</em> can be interpreted as an integer. If the call fails, an exception is raised and <code class="docutils literal notranslate"><span class="pre">-1</span></code> is returned.</p> <p>If <em>o</em> can be converted to a Python int but the attempt to convert to a Py_ssize_t value would raise an <a class="reference internal" href="../library/exceptions.html#OverflowError" title="OverflowError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OverflowError</span></code></a>, then the <em>exc</em> argument is the type of exception that will be raised (usually <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> or <a class="reference internal" href="../library/exceptions.html#OverflowError" title="OverflowError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OverflowError</span></code></a>). If <em>exc</em> is <em>NULL</em>, then the exception is cleared and the value is clipped to <em>PY_SSIZE_T_MIN</em> for a negative integer or <em>PY_SSIZE_T_MAX</em> for a positive integer.</p> </dd></dl> <dl class="function"> <dt id="c.PyIndex_Check"> int <code class="descname">PyIndex_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyIndex_Check" title="Permalink to this definition">ยถ</a></dt> <dd><p>Returns <code class="docutils literal notranslate"><span class="pre">1</span></code> if <em>o</em> is an index integer (has the nb_index slot of the tp_as_number structure filled in), and <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="object.html" title="previous chapter">Object Protocol</a></p> <h4>Next topic</h4> <p class="topless"><a href="sequence.html" title="next chapter">Sequence Protocol</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.6/Doc/c-api/number.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </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="sequence.html" title="Sequence Protocol" >next</a> |</li> <li class="right" > <a href="object.html" title="Object Protocol" >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">3.6.7 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="abstract.html" >Abstract Objects Layer</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" 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> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 2001-2023, 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 Dec 18, 2023. <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>