Team Ai
Apppublic

parthtamu/rag-code-assistant

sourceHugging Faceupdated 7mo agoView on Hugging Face
0likes
constants.html490 linesDownload Raw Back to docs
1<!DOCTYPE html>2 3<html lang="en" data-content_root="../">4  <head>5    <meta charset="utf-8" />6    <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />7<meta property="og:title" content="Built-in Constants" />8<meta property="og:type" content="website" />9<meta property="og:url" content="https://docs.python.org/3/library/constants.html" />10<meta property="og:site_name" content="Python documentation" />11<meta property="og:description" content="A small number of constants live in the built-in namespace. They are: Constants added by the site module: The site module (which is imported automatically during startup, except if the-S command-li..." />12<meta property="og:image:width" content="1146" />13<meta property="og:image:height" content="600" />14<meta property="og:image" content="https://docs.python.org/3.15/_images/social_previews/summary_library_constants_16ed3885.png" />15<meta property="og:image:alt" content="A small number of constants live in the built-in namespace. They are: Constants added by the site module: The site module (which is imported automatically during startup, except if the-S command-li..." />16<meta name="description" content="A small number of constants live in the built-in namespace. They are: Constants added by the site module: The site module (which is imported automatically during startup, except if the-S command-li..." />17<meta name="twitter:card" content="summary_large_image" />18<meta name="theme-color" content="#3776ab">19 20    <title>Built-in Constants &#8212; Python 3.15.0a6 documentation</title><meta name="viewport" content="width=device-width, initial-scale=1.0">21    22    <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=b86133f3" />23    <link rel="stylesheet" type="text/css" href="../_static/classic.css?v=234b1a7c" />24    <link rel="stylesheet" type="text/css" href="../_static/pydoctheme.css?v=89a2f22a" />25    <link rel="stylesheet" type="text/css" href="../_static/profiling-sampling-visualization.css?v=0c2600ae" />26    <link id="pygments_dark_css" media="(prefers-color-scheme: dark)" rel="stylesheet" type="text/css" href="../_static/pygments_dark.css?v=5349f25f" />27    28    <script src="../_static/documentation_options.js?v=6b7c9ff5"></script>29    <script src="../_static/doctools.js?v=9bcbadda"></script>30    <script src="../_static/sphinx_highlight.js?v=dc90522c"></script>31    <script src="../_static/profiling-sampling-visualization.js?v=9811ed04"></script>32    33    <script src="../_static/sidebar.js"></script>34    35    <link rel="search" type="application/opensearchdescription+xml"36          title="Search within Python 3.15.0a6 documentation"37          href="../_static/opensearch.xml"/>38    <link rel="author" title="About these documents" href="../about.html" />39    <link rel="index" title="Index" href="../genindex.html" />40    <link rel="search" title="Search" href="../search.html" />41    <link rel="copyright" title="Copyright" href="../copyright.html" />42    <link rel="next" title="Built-in Types" href="stdtypes.html" />43    <link rel="prev" title="Built-in Functions" href="functions.html" />44    45      46      <script defer file-types="bz2,epub,zip" data-domain="docs.python.org" src="https://analytics.python.org/js/script.file-downloads.outbound-links.js"></script>47      48      <link rel="canonical" href="https://docs.python.org/3/library/constants.html">49      50    51 52    53    <style>54      @media only screen {55        table.full-width-table {56            width: 100%;57        }58      }59    </style>60<link rel="stylesheet" href="../_static/pydoctheme_dark.css" media="(prefers-color-scheme: dark)" id="pydoctheme_dark_css">61    <link rel="shortcut icon" type="image/png" href="../_static/py.svg">62            <script type="text/javascript" src="../_static/copybutton.js"></script>63            <script type="text/javascript" src="../_static/menu.js"></script>64            <script type="text/javascript" src="../_static/search-focus.js"></script>65            <script type="text/javascript" src="../_static/themetoggle.js"></script> 66            <script type="text/javascript" src="../_static/rtd_switcher.js"></script>67            <meta name="readthedocs-addons-api-version" content="1">68 69  </head>70<body>71<div class="mobile-nav">72    <input type="checkbox" id="menuToggler" class="toggler__input" aria-controls="navigation"73           aria-pressed="false" aria-expanded="false" role="button" aria-label="Menu">74    <nav class="nav-content" role="navigation">75        <label for="menuToggler" class="toggler__label">76            <span></span>77        </label>78        <span class="nav-items-wrapper">79            <a href="https://www.python.org/" class="nav-logo">80                <img src="../_static/py.svg" alt="Python logo">81            </a>82            <span class="version_switcher_placeholder"></span>83            <form role="search" class="search" action="../search.html" method="get">84                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" class="search-icon">85                    <path fill-rule="nonzero" fill="currentColor" d="M15.5 14h-.79l-.28-.27a6.5 6.5 0 001.48-5.34c-.47-2.78-2.79-5-5.59-5.34a6.505 6.505 0 00-7.27 7.27c.34 2.8 2.56 5.12 5.34 5.59a6.5 6.5 0 005.34-1.48l.27.28v.79l4.25 4.25c.41.41 1.08.41 1.49 0 .41-.41.41-1.08 0-1.49L15.5 14zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"></path>86                </svg>87                <input placeholder="Quick search" aria-label="Quick search" type="search" name="q">88                <input type="submit" value="Go">89            </form>90        </span>91    </nav>92    <div class="menu-wrapper">93        <nav class="menu" role="navigation" aria-label="main navigation">94            <div class="language_switcher_placeholder"></div>95            96<label class="theme-selector-label">97    Theme98    <select class="theme-selector" oninput="activateTheme(this.value)">99        <option value="auto" selected>Auto</option>100        <option value="light">Light</option>101        <option value="dark">Dark</option>102    </select>103</label>104  <div>105    <h3><a href="../contents.html">Table of Contents</a></h3>106    <ul>107<li><a class="reference internal" href="#">Built-in Constants</a><ul>108<li><a class="reference internal" href="#constants-added-by-the-site-module">Constants added by the <code class="xref py py-mod docutils literal notranslate"><span class="pre">site</span></code> module</a></li>109</ul>110</li>111</ul>112 113  </div>114  <div>115    <h4>Previous topic</h4>116    <p class="topless"><a href="functions.html"117                          title="previous chapter">Built-in Functions</a></p>118  </div>119  <div>120    <h4>Next topic</h4>121    <p class="topless"><a href="stdtypes.html"122                          title="next chapter">Built-in Types</a></p>123  </div>124  <script>125    document.addEventListener('DOMContentLoaded', () => {126        const title = document.querySelector('meta[property="og:title"]').content;127        const elements = document.querySelectorAll('.improvepage');128        const pageurl = window.location.href.split('?')[0];129        elements.forEach(element => {130            const url = new URL(element.href.split('?')[0].replace("-nojs", ""));131            url.searchParams.set('pagetitle', title);132            url.searchParams.set('pageurl', pageurl);133            url.searchParams.set('pagesource', "library/constants.rst");134            element.href = url.toString();135        });136    });137  </script>138  <div role="note" aria-label="source link">139    <h3>This page</h3>140    <ul class="this-page-menu">141      <li><a href="../bugs.html">Report a bug</a></li>142      <li><a class="improvepage" href="../improve-page-nojs.html">Improve this page</a></li>143      <li>144        <a href="https://github.com/python/cpython/blob/main/Doc/library/constants.rst?plain=1"145            rel="nofollow">Show source146        </a>147      </li>148      149    </ul>150  </div>151        </nav>152    </div>153</div>154 155  156    <div class="related" role="navigation" aria-label="Related">157      <h3>Navigation</h3>158      <ul>159        <li class="right" style="margin-right: 10px">160          <a href="../genindex.html" title="General Index"161             accesskey="I">index</a></li>162        <li class="right" >163          <a href="../py-modindex.html" title="Python Module Index"164             >modules</a> |</li>165        <li class="right" >166          <a href="stdtypes.html" title="Built-in Types"167             accesskey="N">next</a> |</li>168        <li class="right" >169          <a href="functions.html" title="Built-in Functions"170             accesskey="P">previous</a> |</li>171 172          <li><img src="../_static/py.svg" alt="Python logo" style="vertical-align: middle; margin-top: -1px"></li>173          <li><a href="https://www.python.org/">Python</a> &#187;</li>174          <li class="switchers">175            <div class="language_switcher_placeholder"></div>176            <div class="version_switcher_placeholder"></div>177          </li>178          <li>179              180          </li>181    <li id="cpython-language-and-version">182      <a href="../index.html">3.15.0a6 Documentation</a> &#187;183    </li>184 185          <li class="nav-item nav-item-1"><a href="index.html" accesskey="U">The Python Standard Library</a> &#187;</li>186        <li class="nav-item nav-item-this"><a href="">Built-in Constants</a></li>187                <li class="right">188                    189 190    <div class="inline-search" role="search">191        <form class="inline-search" action="../search.html" method="get">192          <input placeholder="Quick search" aria-label="Quick search" type="search" name="q" id="search-box">193          <input type="submit" value="Go">194        </form>195    </div>196                     |197                </li>198            <li class="right">199<label class="theme-selector-label">200    Theme201    <select class="theme-selector" oninput="activateTheme(this.value)">202        <option value="auto" selected>Auto</option>203        <option value="light">Light</option>204        <option value="dark">Dark</option>205    </select>206</label> |</li>207            208      </ul>209    </div>    210 211    <div class="document">212      <div class="documentwrapper">213        <div class="bodywrapper">214          <div class="body" role="main">215            216  <section id="built-in-constants">217<span id="built-in-consts"></span><h1>Built-in Constants<a class="headerlink" href="#built-in-constants" title="Link to this heading">¶</a></h1>218<p>A small number of constants live in the built-in namespace.  They are:</p>219<dl class="py data">220<dt class="sig sig-object py" id="False">221<span class="sig-name descname"><span class="pre">False</span></span><a class="headerlink" href="#False" title="Link to this definition">¶</a></dt>222<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. Assignments to <code class="docutils literal notranslate"><span class="pre">False</span></code>223are illegal and raise a <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>.</p>224</dd></dl>225 226<dl class="py data">227<dt class="sig sig-object py" id="True">228<span class="sig-name descname"><span class="pre">True</span></span><a class="headerlink" href="#True" title="Link to this definition">¶</a></dt>229<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. Assignments to <code class="docutils literal notranslate"><span class="pre">True</span></code>230are illegal and raise a <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>.</p>231</dd></dl>232 233<dl class="py data">234<dt class="sig sig-object py" id="None">235<span class="sig-name descname"><span class="pre">None</span></span><a class="headerlink" href="#None" title="Link to this definition">¶</a></dt>236<dd><p>An object frequently used to represent the absence of a value, as when237default arguments are not passed to a function. Assignments to <code class="docutils literal notranslate"><span class="pre">None</span></code>238are illegal and raise a <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>.239<code class="docutils literal notranslate"><span class="pre">None</span></code> is the sole instance of the <a class="reference internal" href="types.html#types.NoneType" title="types.NoneType"><code class="xref py py-data docutils literal notranslate"><span class="pre">NoneType</span></code></a> type.</p>240</dd></dl>241 242<dl class="py data">243<dt class="sig sig-object py" id="NotImplemented">244<span class="sig-name descname"><span class="pre">NotImplemented</span></span><a class="headerlink" href="#NotImplemented" title="Link to this definition">¶</a></dt>245<dd><p>A special value which should be returned by the binary special methods246(e.g. <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>, <a class="reference internal" href="../reference/datamodel.html#object.__add__" title="object.__add__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__add__()</span></code></a>, <a class="reference internal" href="../reference/datamodel.html#object.__rsub__" title="object.__rsub__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__rsub__()</span></code></a>,247etc.) to indicate that the operation is not implemented with respect to248the other type; may be returned by the in-place binary special methods249(e.g. <a class="reference internal" href="../reference/datamodel.html#object.__imul__" title="object.__imul__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__imul__()</span></code></a>, <a class="reference internal" href="../reference/datamodel.html#object.__iand__" title="object.__iand__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__iand__()</span></code></a>, etc.) for the same purpose.250It should not be evaluated in a boolean context.251<code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> is the sole instance of the <a class="reference internal" href="types.html#types.NotImplementedType" title="types.NotImplementedType"><code class="xref py py-data docutils literal notranslate"><span class="pre">types.NotImplementedType</span></code></a> type.</p>252<div class="admonition note">253<p class="admonition-title">Note</p>254<p>When a binary (or in-place) method returns <code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> the255interpreter will try the reflected operation on the other type (or some256other fallback, depending on the operator).  If all attempts return257<code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code>, the interpreter will raise an appropriate exception.258Incorrectly returning <code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> will result in a misleading259error message or the <code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> value being returned to Python code.</p>260<p>See <a class="reference internal" href="numbers.html#implementing-the-arithmetic-operations"><span class="std std-ref">Implementing the arithmetic operations</span></a> for examples.</p>261</div>262<div class="admonition caution">263<p class="admonition-title">Caution</p>264<p><code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> and <code class="xref py py-exc docutils literal notranslate"><span class="pre">NotImplementedError</span></code> are not265interchangeable. This constant should only be used as described266above; see <a class="reference internal" href="exceptions.html#NotImplementedError" title="NotImplementedError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">NotImplementedError</span></code></a> for details on correct usage267of the exception.</p>268</div>269<div class="versionchanged">270<p><span class="versionmodified changed">Changed in version 3.9: </span>Evaluating <code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> in a boolean context was deprecated.</p>271</div>272<div class="versionchanged">273<p><span class="versionmodified changed">Changed in version 3.14: </span>Evaluating <code class="xref py py-data docutils literal notranslate"><span class="pre">NotImplemented</span></code> in a boolean context now raises a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a>.274It previously evaluated to <a class="reference internal" href="#True" title="True"><code class="xref py py-const docutils literal notranslate"><span class="pre">True</span></code></a> and emitted a <a class="reference internal" href="exceptions.html#DeprecationWarning" title="DeprecationWarning"><code class="xref py py-exc docutils literal notranslate"><span class="pre">DeprecationWarning</span></code></a>275since Python 3.9.</p>276</div>277</dd></dl>278 279<dl class="py data" id="index-0">280<dt class="sig sig-object py" id="Ellipsis">281<span class="sig-name descname"><span class="pre">Ellipsis</span></span><a class="headerlink" href="#Ellipsis" title="Link to this definition">¶</a></dt>282<dd><p>The same as the ellipsis literal “<code class="docutils literal notranslate"><span class="pre">...</span></code>”, an object frequently used to283indicate that something is omitted. Assignment to <code class="docutils literal notranslate"><span class="pre">Ellipsis</span></code> is possible, but284assignment to  <code class="docutils literal notranslate"><span class="pre">...</span></code> raises a <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>.285<code class="docutils literal notranslate"><span class="pre">Ellipsis</span></code> is the sole instance of the <a class="reference internal" href="types.html#types.EllipsisType" title="types.EllipsisType"><code class="xref py py-data docutils literal notranslate"><span class="pre">types.EllipsisType</span></code></a> type.</p>286</dd></dl>287 288<dl class="py data">289<dt class="sig sig-object py" id="debug__">290<span class="sig-name descname"><span class="pre">__debug__</span></span><a class="headerlink" href="#debug__" title="Link to this definition">¶</a></dt>291<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.292See 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>293</dd></dl>294 295<div class="admonition note">296<p class="admonition-title">Note</p>297<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>, <a class="reference internal" href="#False" title="False"><code class="xref py py-data docutils literal notranslate"><span class="pre">False</span></code></a>, <a class="reference internal" href="#True" title="True"><code class="xref py py-data docutils literal notranslate"><span class="pre">True</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>298cannot be reassigned (assignments to them, even as an attribute name, raise299<a class="reference internal" href="exceptions.html#SyntaxError" title="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>300</div>301<section id="constants-added-by-the-site-module">302<span id="site-consts"></span><h2>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="Link to this heading">¶</a></h2>303<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, except304if the <a class="reference internal" href="../using/cmdline.html#cmdoption-S"><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 the305built-in namespace.  They are useful for the interactive interpreter shell and306should not be used in programs.</p>307<dl class="py data">308<dt class="sig sig-object py" id="quit">309<span class="sig-name descname"><span class="pre">quit</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#quit" title="Link to this definition">¶</a></dt>310<dt class="sig sig-object py" id="exit">311<span class="sig-name descname"><span class="pre">exit</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#exit" title="Link to this definition">¶</a></dt>312<dd><p>Objects that when printed, print a message like “Use quit() or Ctrl-D313(i.e. EOF) to exit”, and when accessed directly in the interactive314interpreter or called as functions, raise <a class="reference internal" href="exceptions.html#SystemExit" title="SystemExit"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SystemExit</span></code></a> with the315specified exit code.</p>316</dd></dl>317 318<dl class="py data">319<dt class="sig sig-object py">320<span class="sig-name descname"><span class="pre">help</span></span></dt>321<dd><p>Object that when printed, prints the message “Type help() for interactive322help, or help(object) for help about object.”, and when accessed directly323in the interactive interpreter, invokes the built-in help system324(see <a class="reference internal" href="functions.html#help" title="help"><code class="xref py py-func docutils literal notranslate"><span class="pre">help()</span></code></a>).</p>325</dd></dl>326 327<dl class="py data">328<dt class="sig sig-object py" id="copyright">329<span class="sig-name descname"><span class="pre">copyright</span></span><a class="headerlink" href="#copyright" title="Link to this definition">¶</a></dt>330<dt class="sig sig-object py" id="credits">331<span class="sig-name descname"><span class="pre">credits</span></span><a class="headerlink" href="#credits" title="Link to this definition">¶</a></dt>332<dd><p>Objects that when printed or called, print the text of copyright or333credits, respectively.</p>334</dd></dl>335 336<dl class="py data">337<dt class="sig sig-object py" id="license">338<span class="sig-name descname"><span class="pre">license</span></span><a class="headerlink" href="#license" title="Link to this definition">¶</a></dt>339<dd><p>Object that when printed, prints the message “Type license() to see the340full license text”, and when called, displays the full license text in a341pager-like fashion (one screen at a time).</p>342</dd></dl>343 344</section>345</section>346 347 348            <div class="clearer"></div>349          </div>350        </div>351      </div>352      <div class="sphinxsidebar" role="navigation" aria-label="Main">353        <div class="sphinxsidebarwrapper">354  <div>355    <h3><a href="../contents.html">Table of Contents</a></h3>356    <ul>357<li><a class="reference internal" href="#">Built-in Constants</a><ul>358<li><a class="reference internal" href="#constants-added-by-the-site-module">Constants added by the <code class="xref py py-mod docutils literal notranslate"><span class="pre">site</span></code> module</a></li>359</ul>360</li>361</ul>362 363  </div>364  <div>365    <h4>Previous topic</h4>366    <p class="topless"><a href="functions.html"367                          title="previous chapter">Built-in Functions</a></p>368  </div>369  <div>370    <h4>Next topic</h4>371    <p class="topless"><a href="stdtypes.html"372                          title="next chapter">Built-in Types</a></p>373  </div>374  <script>375    document.addEventListener('DOMContentLoaded', () => {376        const title = document.querySelector('meta[property="og:title"]').content;377        const elements = document.querySelectorAll('.improvepage');378        const pageurl = window.location.href.split('?')[0];379        elements.forEach(element => {380            const url = new URL(element.href.split('?')[0].replace("-nojs", ""));381            url.searchParams.set('pagetitle', title);382            url.searchParams.set('pageurl', pageurl);383            url.searchParams.set('pagesource', "library/constants.rst");384            element.href = url.toString();385        });386    });387  </script>388  <div role="note" aria-label="source link">389    <h3>This page</h3>390    <ul class="this-page-menu">391      <li><a href="../bugs.html">Report a bug</a></li>392      <li><a class="improvepage" href="../improve-page-nojs.html">Improve this page</a></li>393      <li>394        <a href="https://github.com/python/cpython/blob/main/Doc/library/constants.rst?plain=1"395            rel="nofollow">Show source396        </a>397      </li>398      399    </ul>400  </div>401        </div>402<div id="sidebarbutton" title="Collapse sidebar">403<span>«</span>404</div>405 406      </div>407      <div class="clearer"></div>408    </div>  409    <div class="related" role="navigation" aria-label="Related">410      <h3>Navigation</h3>411      <ul>412        <li class="right" style="margin-right: 10px">413          <a href="../genindex.html" title="General Index"414             >index</a></li>415        <li class="right" >416          <a href="../py-modindex.html" title="Python Module Index"417             >modules</a> |</li>418        <li class="right" >419          <a href="stdtypes.html" title="Built-in Types"420             >next</a> |</li>421        <li class="right" >422          <a href="functions.html" title="Built-in Functions"423             >previous</a> |</li>424 425          <li><img src="../_static/py.svg" alt="Python logo" style="vertical-align: middle; margin-top: -1px"></li>426          <li><a href="https://www.python.org/">Python</a> &#187;</li>427          <li class="switchers">428            <div class="language_switcher_placeholder"></div>429            <div class="version_switcher_placeholder"></div>430          </li>431          <li>432              433          </li>434    <li id="cpython-language-and-version">435      <a href="../index.html">3.15.0a6 Documentation</a> &#187;436    </li>437 438          <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>439        <li class="nav-item nav-item-this"><a href="">Built-in Constants</a></li>440                <li class="right">441                    442 443    <div class="inline-search" role="search">444        <form class="inline-search" action="../search.html" method="get">445          <input placeholder="Quick search" aria-label="Quick search" type="search" name="q" id="search-box">446          <input type="submit" value="Go">447        </form>448    </div>449                     |450                </li>451            <li class="right">452<label class="theme-selector-label">453    Theme454    <select class="theme-selector" oninput="activateTheme(this.value)">455        <option value="auto" selected>Auto</option>456        <option value="light">Light</option>457        <option value="dark">Dark</option>458    </select>459</label> |</li>460            461      </ul>462    </div>  463    <div class="footer">464    &copy; <a href="../copyright.html">Copyright</a> 2001 Python Software Foundation.465    <br>466    This page is licensed under the Python Software Foundation License Version 2.467    <br>468    Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License.469    <br>470    471      See <a href="/license.html">History and License</a> for more information.<br>472    473    474    <br>475 476    The Python Software Foundation is a non-profit corporation.477<a href="https://www.python.org/psf/donations/">Please donate.</a>478<br>479    <br>480      Last updated on Mar 10, 2026 (08:58 UTC).481    482      <a href="/bugs.html">Found a bug</a>?483    484    <br>485 486    Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 8.2.3.487    </div>488 489  </body>490</html>