Kerala Cyber
Warriors
KCW Uploader V1.1
<!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>4. Built-in Constants — Python 2.7.18 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/language_data.js"></script>
<script type="text/javascript" src="../_static/sidebar.js"></script>
<link rel="search" type="application/opensearchdescription+xml"
title="Search within Python 2.7.18 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="5. Built-in Types" href="stdtypes.html" />
<link rel="prev" title="2. Built-in Functions" href="functions.html" />
<link rel="shortcut icon" type="image/png" href="../_static/py.png" />
<link rel="canonical" href="file:///usr/share/doc/python2.7/html/library/constants.html" />
<script type="text/javascript" src="../_static/copybutton.js"></script>
</head><body>
<div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;">
This document is for an old version of Python that is <a href="https://devguide.python.org/devcycle/#end-of-life-branches">no longer supported</a>.
You should install the python3 and python3-doc packages and read the
<a href="file:///usr/share/doc/python3-doc/html/library/constants.html"> Python documentation for the Python3 version packaged in this release</a>.
</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"
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="stdtypes.html" title="5. Built-in Types"
accesskey="N">next</a> |</li>
<li class="right" >
<a href="functions.html" title="2. Built-in Functions"
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 2.7.18 documentation</a> »
</li>
<li class="nav-item nav-item-1"><a href="index.html" accesskey="U">The Python Standard Library</a> »</li>
</ul>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<div class="section" id="built-in-constants">
<span id="built-in-consts"></span><h1>4. Built-in Constants<a class="headerlink" href="#built-in-constants" title="Permalink to this headline">¶</a></h1>
<p>A small number of constants live in the built-in namespace. They are:</p>
<dl class="data">
<dt id="False">
<code class="descname">False</code><a class="headerlink" href="#False" title="Permalink to this definition">¶</a></dt>
<dd><p>The false value of the <a class="reference internal" href="functions.html#bool" title="bool"><code class="xref py py-class docutils literal notranslate"><span class="pre">bool</span></code></a> type.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.3.</span></p>
</div>
</dd></dl>
<dl class="data">
<dt id="True">
<code class="descname">True</code><a class="headerlink" href="#True" title="Permalink to this definition">¶</a></dt>
<dd><p>The true value of the <a class="reference internal" href="functions.html#bool" title="bool"><code class="xref py py-class docutils literal notranslate"><span class="pre">bool</span></code></a> type.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.3.</span></p>
</div>
</dd></dl>
<dl class="data">
<dt id="None">
<code class="descname">None</code><a class="headerlink" href="#None" title="Permalink to this definition">¶</a></dt>
<dd><p>The sole value of <a class="reference internal" href="types.html#types.NoneType" title="types.NoneType"><code class="xref py py-attr docutils literal notranslate"><span class="pre">types.NoneType</span></code></a>. <code class="docutils literal notranslate"><span class="pre">None</span></code> is frequently used to
represent the absence of a value, as when default arguments are not passed to a
function.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 2.4: </span>Assignments to <code class="docutils literal notranslate"><span class="pre">None</span></code> are illegal and raise a <a class="reference internal" href="exceptions.html#exceptions.SyntaxError" title="exceptions.SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>.</p>
</div>
</dd></dl>
<dl class="data">
<dt id="NotImplemented">
<code class="descname">NotImplemented</code><a class="headerlink" href="#NotImplemented" title="Permalink to this definition">¶</a></dt>
<dd><p>Special value which can be returned by the “rich comparison” special methods
(<a class="reference internal" href="../reference/datamodel.html#object.__eq__" title="object.__eq__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__eq__()</span></code></a>, <a class="reference internal" href="../reference/datamodel.html#object.__lt__" title="object.__lt__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__lt__()</span></code></a>, and friends), to indicate that the comparison
is not implemented with respect to the other type.</p>
</dd></dl>
<dl class="data">
<dt id="Ellipsis">
<code class="descname">Ellipsis</code><a class="headerlink" href="#Ellipsis" title="Permalink to this definition">¶</a></dt>
<dd><p>Special value used in conjunction with extended slicing syntax.</p>
</dd></dl>
<dl class="data">
<dt id="__debug__">
<code class="descname">__debug__</code><a class="headerlink" href="#__debug__" title="Permalink to this definition">¶</a></dt>
<dd><p>This constant is true if Python was not started with an <a class="reference internal" href="../using/cmdline.html#cmdoption-o"><code class="xref std std-option docutils literal notranslate"><span class="pre">-O</span></code></a> option.
See also the <a class="reference internal" href="../reference/simple_stmts.html#assert"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">assert</span></code></a> statement.</p>
</dd></dl>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>The names <a class="reference internal" href="#None" title="None"><code class="xref py py-data docutils literal notranslate"><span class="pre">None</span></code></a> and <a class="reference internal" href="#__debug__" title="__debug__"><code class="xref py py-data docutils literal notranslate"><span class="pre">__debug__</span></code></a> cannot be reassigned
(assignments to them, even as an attribute name, raise <a class="reference internal" href="exceptions.html#exceptions.SyntaxError" title="exceptions.SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>),
so they can be considered “true” constants.</p>
<div class="last versionchanged">
<p><span class="versionmodified">Changed in version 2.7: </span>Assignments to <code class="docutils literal notranslate"><span class="pre">__debug__</span></code> as an attribute became illegal.</p>
</div>
</div>
<div class="section" id="constants-added-by-the-site-module">
<h2>4.1. Constants added by the <a class="reference internal" href="site.html#module-site" title="site: Module responsible for site-specific configuration."><code class="xref py py-mod docutils literal notranslate"><span class="pre">site</span></code></a> module<a class="headerlink" href="#constants-added-by-the-site-module" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="site.html#module-site" title="site: Module responsible for site-specific configuration."><code class="xref py py-mod docutils literal notranslate"><span class="pre">site</span></code></a> module (which is imported automatically during startup, except
if the <a class="reference internal" href="../using/cmdline.html#id2"><code class="xref std std-option docutils literal notranslate"><span class="pre">-S</span></code></a> command-line option is given) adds several constants to the
built-in namespace. They are useful for the interactive interpreter shell and
should not be used in programs.</p>
<dl class="data">
<dt id="quit">
<code class="descname">quit</code><span class="sig-paren">(</span><span class="optional">[</span><em>code=None</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#quit" title="Permalink to this definition">¶</a></dt>
<dt id="exit">
<code class="descname">exit</code><span class="sig-paren">(</span><span class="optional">[</span><em>code=None</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#exit" title="Permalink to this definition">¶</a></dt>
<dd><p>Objects that when printed, print a message like “Use quit() or Ctrl-D
(i.e. EOF) to exit”, and when called, raise <a class="reference internal" href="exceptions.html#exceptions.SystemExit" title="exceptions.SystemExit"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SystemExit</span></code></a> with the
specified exit code.</p>
</dd></dl>
<dl class="data">
<dt id="copyright">
<code class="descname">copyright</code><a class="headerlink" href="#copyright" title="Permalink to this definition">¶</a></dt>
<dt id="credits">
<code class="descname">credits</code><a class="headerlink" href="#credits" title="Permalink to this definition">¶</a></dt>
<dd><p>Objects that when printed or called, print the text of copyright or
credits, respectively.</p>
</dd></dl>
<dl class="data">
<dt id="license">
<code class="descname">license</code><a class="headerlink" href="#license" title="Permalink to this definition">¶</a></dt>
<dd><p>Object that when printed, prints the message “Type license() to see the
full license text”, and when called, displays the full license text in a
pager-like fashion (one screen at a time).</p>
</dd></dl>
</div>
</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="#">4. Built-in Constants</a><ul>
<li><a class="reference internal" href="#constants-added-by-the-site-module">4.1. Constants added by the <code class="docutils literal notranslate"><span class="pre">site</span></code> module</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="functions.html"
title="previous chapter">2. Built-in Functions</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="stdtypes.html"
title="next chapter">5. Built-in Types</a></p>
<div role="note" aria-label="source link">
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="../_sources/library/constants.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="stdtypes.html" title="5. Built-in Types"
>next</a> |</li>
<li class="right" >
<a href="functions.html" title="2. Built-in Functions"
>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 2.7.18 documentation</a> »
</li>
<li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li>
</ul>
</div>
<div class="footer">
© <a href="../copyright.html">Copyright</a> 1990-2024, 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 November 21, 2024.
<a href="../bugs.html">Found a bug</a>?
<br />
Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.8.5.
</div>
</body>
</html>
-=[ KCW uplo4d3r c0ded by cJ_n4p573r ]=-
Ⓒ2017 ҠЄГѦLѦ СүѣЄГ ЩѦГГіѺГՏ