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  • Committer: Dave Kuhlman
  • Date: 2017-04-15 16:24:56 UTC
  • Revision ID: dkuhlman@davekuhlman.org-20170415162456-iav9vozzg4iwqwv3
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python-2.7.12-docs-html/c-api/bool.html
 
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 
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  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
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<html xmlns="http://www.w3.org/1999/xhtml">
 
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  <head>
 
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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 
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    <title>Boolean Objects &mdash; Python 2.7.12 documentation</title>
 
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    <link rel="stylesheet" href="../_static/classic.css" type="text/css" />
 
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    <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
 
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    <script type="text/javascript">
 
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      var DOCUMENTATION_OPTIONS = {
 
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        URL_ROOT:    '../',
 
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        VERSION:     '2.7.12',
 
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        COLLAPSE_INDEX: false,
 
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        FILE_SUFFIX: '.html',
 
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        HAS_SOURCE:  true
 
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      };
 
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    </script>
 
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    <script type="text/javascript" src="../_static/jquery.js"></script>
 
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    <script type="text/javascript" src="../_static/underscore.js"></script>
 
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    <script type="text/javascript" src="../_static/doctools.js"></script>
 
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    <script type="text/javascript" src="../_static/sidebar.js"></script>
 
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    <link rel="search" type="application/opensearchdescription+xml"
 
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          title="Search within Python 2.7.12 documentation"
 
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          href="../_static/opensearch.xml"/>
 
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    <link rel="author" title="About these documents" href="../about.html" />
 
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    <link rel="copyright" title="Copyright" href="../copyright.html" />
 
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    <link rel="top" title="Python 2.7.12 documentation" href="../contents.html" />
 
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    <link rel="up" title="Concrete Objects Layer" href="concrete.html" />
 
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    <link rel="next" title="Long Integer Objects" href="long.html" />
 
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    <link rel="prev" title="Plain Integer Objects" href="int.html" />
 
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    <link rel="shortcut icon" type="image/png" href="../_static/py.png" />
 
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    <script type="text/javascript" src="../_static/copybutton.js"></script>
 
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    <script type="text/javascript" src="../_static/version_switch.js"></script>
 
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  </head>
 
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  <body role="document">  
 
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    <div class="related" role="navigation" aria-label="related navigation">
 
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      <h3>Navigation</h3>
 
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      <ul>
 
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        <li class="right" style="margin-right: 10px">
 
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          <a href="../genindex.html" title="General Index"
 
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             accesskey="I">index</a></li>
 
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        <li class="right" >
 
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          <a href="../py-modindex.html" title="Python Module Index"
 
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             >modules</a> |</li>
 
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        <li class="right" >
 
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          <a href="long.html" title="Long Integer Objects"
 
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             accesskey="N">next</a> |</li>
 
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        <li class="right" >
 
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          <a href="int.html" title="Plain Integer Objects"
 
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             accesskey="P">previous</a> |</li>
 
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        <li><img src="../_static/py.png" alt=""
 
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                 style="vertical-align: middle; margin-top: -1px"/></li>
 
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        <li><a href="https://www.python.org/">Python</a> &raquo;</li>
 
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        <li>
 
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          <span class="version_switcher_placeholder">2.7.12</span>
 
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          <a href="../index.html">Documentation</a> &raquo;
 
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        </li>
 
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          <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> &raquo;</li>
 
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          <li class="nav-item nav-item-2"><a href="concrete.html" accesskey="U">Concrete Objects Layer</a> &raquo;</li> 
 
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      </ul>
 
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    </div>    
 
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    <div class="document">
 
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      <div class="documentwrapper">
 
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        <div class="bodywrapper">
 
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          <div class="body" role="main">
 
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  <div class="section" id="boolean-objects">
 
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<span id="boolobjects"></span><h1>Boolean Objects<a class="headerlink" href="#boolean-objects" title="Permalink to this headline">¶</a></h1>
 
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<p>Booleans in Python are implemented as a subclass of integers.  There are only
 
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two booleans, <code class="xref py py-const docutils literal"><span class="pre">Py_False</span></code> and <code class="xref py py-const docutils literal"><span class="pre">Py_True</span></code>.  As such, the normal
 
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creation and deletion functions don&#8217;t apply to booleans.  The following macros
 
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are available, however.</p>
 
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<dl class="function">
 
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<dt id="c.PyBool_Check">
 
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int <code class="descname">PyBool_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em>&nbsp;*o</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyBool_Check" title="Permalink to this definition">¶</a></dt>
 
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<dd><p>Return true if <em>o</em> is of type <code class="xref c c-data docutils literal"><span class="pre">PyBool_Type</span></code>.</p>
 
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<div class="versionadded">
 
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<p><span class="versionmodified">New in version 2.3.</span></p>
 
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</div>
 
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</dd></dl>
 
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<dl class="var">
 
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<dt id="c.Py_False">
 
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<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">Py_False</code><a class="headerlink" href="#c.Py_False" title="Permalink to this definition">¶</a></dt>
 
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<dd><p>The Python <code class="docutils literal"><span class="pre">False</span></code> object.  This object has no methods.  It needs to be
 
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treated just like any other object with respect to reference counts.</p>
 
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</dd></dl>
 
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<dl class="var">
 
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<dt id="c.Py_True">
 
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<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">Py_True</code><a class="headerlink" href="#c.Py_True" title="Permalink to this definition">¶</a></dt>
 
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<dd><p>The Python <code class="docutils literal"><span class="pre">True</span></code> object.  This object has no methods.  It needs to be treated
 
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just like any other object with respect to reference counts.</p>
 
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</dd></dl>
 
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<dl class="macro">
 
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<dt id="c.Py_RETURN_FALSE">
 
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<code class="descname">Py_RETURN_FALSE</code><a class="headerlink" href="#c.Py_RETURN_FALSE" title="Permalink to this definition">¶</a></dt>
 
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<dd><p>Return <code class="xref py py-const docutils literal"><span class="pre">Py_False</span></code> from a function, properly incrementing its reference
 
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count.</p>
 
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<div class="versionadded">
 
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<p><span class="versionmodified">New in version 2.4.</span></p>
 
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</div>
 
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</dd></dl>
 
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<dl class="macro">
 
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<dt id="c.Py_RETURN_TRUE">
 
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<code class="descname">Py_RETURN_TRUE</code><a class="headerlink" href="#c.Py_RETURN_TRUE" title="Permalink to this definition">¶</a></dt>
 
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<dd><p>Return <code class="xref py py-const docutils literal"><span class="pre">Py_True</span></code> from a function, properly incrementing its reference
 
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count.</p>
 
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<div class="versionadded">
 
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<p><span class="versionmodified">New in version 2.4.</span></p>
 
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</div>
 
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</dd></dl>
 
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<dl class="function">
 
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<dt id="c.PyBool_FromLong">
 
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<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyBool_FromLong</code><span class="sig-paren">(</span>long<em>&nbsp;v</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyBool_FromLong" title="Permalink to this definition">¶</a></dt>
 
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<dd><em class="refcount">Return value: New reference.</em><p>Return a new reference to <code class="xref py py-const docutils literal"><span class="pre">Py_True</span></code> or <code class="xref py py-const docutils literal"><span class="pre">Py_False</span></code> depending on the
 
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truth value of <em>v</em>.</p>
 
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<div class="versionadded">
 
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<p><span class="versionmodified">New in version 2.3.</span></p>
 
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</div>
 
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</dd></dl>
 
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</div>
 
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          </div>
 
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        </div>
 
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      </div>
 
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      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
 
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        <div class="sphinxsidebarwrapper">
 
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  <h4>Previous topic</h4>
 
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  <p class="topless"><a href="int.html"
 
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                        title="previous chapter">Plain Integer Objects</a></p>
 
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  <h4>Next topic</h4>
 
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  <p class="topless"><a href="long.html"
 
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                        title="next chapter">Long Integer Objects</a></p>
 
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<h3>This Page</h3>
 
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<ul class="this-page-menu">
 
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  <li><a href="../bugs.html">Report a Bug</a></li>
 
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  <li><a href="../_sources/c-api/bool.txt"
 
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         rel="nofollow">Show Source</a></li>
 
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</ul>
 
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<div id="searchbox" style="display: none" role="search">
 
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  <h3>Quick search</h3>
 
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    <form class="search" action="../search.html" method="get">
 
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      <input type="text" name="q" />
 
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      <input type="submit" value="Go" />
 
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      <input type="hidden" name="check_keywords" value="yes" />
 
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      <input type="hidden" name="area" value="default" />
 
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    </form>
 
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    <p class="searchtip" style="font-size: 90%">
 
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    Enter search terms or a module, class or function name.
 
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    </p>
 
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</div>
 
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<script type="text/javascript">$('#searchbox').show(0);</script>
 
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        </div>
 
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      </div>
 
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      <div class="clearer"></div>
 
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    </div>  
 
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    <div class="related" role="navigation" aria-label="related navigation">
 
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      <h3>Navigation</h3>
 
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      <ul>
 
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        <li class="right" style="margin-right: 10px">
 
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          <a href="../genindex.html" title="General Index"
 
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             >index</a></li>
 
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        <li class="right" >
 
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          <a href="../py-modindex.html" title="Python Module Index"
 
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             >modules</a> |</li>
 
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        <li class="right" >
 
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          <a href="long.html" title="Long Integer Objects"
 
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             >next</a> |</li>
 
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        <li class="right" >
 
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          <a href="int.html" title="Plain Integer Objects"
 
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             >previous</a> |</li>
 
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        <li><img src="../_static/py.png" alt=""
 
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                 style="vertical-align: middle; margin-top: -1px"/></li>
 
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        <li><a href="https://www.python.org/">Python</a> &raquo;</li>
 
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        <li>
 
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          <span class="version_switcher_placeholder">2.7.12</span>
 
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          <a href="../index.html">Documentation</a> &raquo;
 
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        </li>
 
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          <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> &raquo;</li>
 
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          <li class="nav-item nav-item-2"><a href="concrete.html" >Concrete Objects Layer</a> &raquo;</li> 
 
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      </ul>
 
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    </div>  
 
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    <div class="footer">
 
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    &copy; <a href="../copyright.html">Copyright</a> 1990-2016, Python Software Foundation.
 
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    <br />
 
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    The Python Software Foundation is a non-profit corporation.
 
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    <a href="https://www.python.org/psf/donations/">Please donate.</a>
 
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    <br />
 
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    Last updated on Sep 20, 2016.
 
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    <a href="../bugs.html">Found a bug</a>?
 
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    <br />
 
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    Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.3.3.
 
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    </div>
 
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</html>
 
 
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