sam-t2/devtools/v8plus/html/python/lib/node35.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<link rel="STYLESHEET" href="lib.css" type='text/css' />
<link rel="SHORTCUT ICON" href="../icons/pyfav.png" type="image/png" />
<link rel='start' href='../index.html' title='Python Documentation Index' />
<link rel="first" href="lib.html" title='Python Library Reference' />
<link rel='contents' href='contents.html' title="Contents" />
<link rel='index' href='genindex.html' title='Index' />
<link rel='last' href='about.html' title='About this document...' />
<link rel='help' href='about.html' title='About this document...' />
<link rel="prev" href="module-exceptions.html" />
<link rel="parent" href="builtin.html" />
<link rel="next" href="python.html" />
<meta name='aesop' content='information' />
<title>2.5 Built-in Constants</title>
</head>
<body>
<DIV CLASS="navigation">
<div id='top-navigation-panel' xml:id='top-navigation-panel'>
<table align="center" width="100%" cellpadding="0" cellspacing="2">
<tr>
<td class='online-navigation'><a rel="prev" title="2.4 Built-in Exceptions"
  href="module-exceptions.html"><img src='../icons/previous.png'
  border='0' height='32'  alt='Previous Page' width='32' /></A></td>
<td class='online-navigation'><a rel="parent" title="2. Built-In Objects"
  href="builtin.html"><img src='../icons/up.png'
  border='0' height='32'  alt='Up One Level' width='32' /></A></td>
<td class='online-navigation'><a rel="next" title="3. Python Runtime Services"
  href="python.html"><img src='../icons/next.png'
  border='0' height='32'  alt='Next Page' width='32' /></A></td>
<td align="center" width="100%">Python Library Reference</td>
<td class='online-navigation'><a rel="contents" title="Table of Contents"
  href="contents.html"><img src='../icons/contents.png'
  border='0' height='32'  alt='Contents' width='32' /></A></td>
<td class='online-navigation'><a href="modindex.html" title="Module Index"><img src='../icons/modules.png'
  border='0' height='32'  alt='Module Index' width='32' /></a></td>
<td class='online-navigation'><a rel="index" title="Index"
  href="genindex.html"><img src='../icons/index.png'
  border='0' height='32'  alt='Index' width='32' /></A></td>
</tr></table>
<div class='online-navigation'>
<b class="navlabel">Previous:</b>
<a class="sectref" rel="prev" href="module-exceptions.html">2.4 Built-in Exceptions</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="builtin.html">2. Built-In Objects</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="python.html">3. Python Runtime Services</A>
</div>
<hr /></div>
</DIV>
<!--End of Navigation Panel-->

<H1><A NAME="SECTION004500000000000000000">
2.5 Built-in Constants</A>
</H1>

<P>
A small number of constants live in the built-in namespace.  They are:

<P>
<dl><dt><b><tt id='l2h-323' xml:id='l2h-323'>False</tt></b></dt>
<dd>
  The false value of the <tt class="class">bool</tt> type.

<span class="versionnote">New in version 2.3.</span>

</dd></dl>

<P>
<dl><dt><b><tt id='l2h-324' xml:id='l2h-324'>True</tt></b></dt>
<dd>
  The true value of the <tt class="class">bool</tt> type.

<span class="versionnote">New in version 2.3.</span>

</dd></dl>

<P>
<dl><dt><b><tt id='l2h-325' xml:id='l2h-325'>None</tt></b></dt>
<dd>
  The sole value of <code><tt class="module"><a href="module-types.html">types</a></tt>.NoneType</code>.  <code>None</code> is
  frequently used to represent the absence of a value, as when default
  arguments are not passed to a function.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-326' xml:id='l2h-326'>NotImplemented</tt></b></dt>
<dd>
  Special value which can be returned by the ``rich comparison''
  special methods (<tt class="method">__eq__()</tt>, <tt class="method">__lt__()</tt>, and friends),
  to indicate that the comparison is not implemented with respect to
  the other type.
</dd></dl>

<P>
<dl><dt><b><tt id='l2h-327' xml:id='l2h-327'>Ellipsis</tt></b></dt>
<dd>
  Special value used in conjunction with extended slicing syntax.
  </dd></dl>

<P>

<DIV CLASS="navigation">
<div class='online-navigation'>
<p></p><hr />
<table align="center" width="100%" cellpadding="0" cellspacing="2">
<tr>
<td class='online-navigation'><a rel="prev" title="2.4 Built-in Exceptions"
  href="module-exceptions.html"><img src='../icons/previous.png'
  border='0' height='32'  alt='Previous Page' width='32' /></A></td>
<td class='online-navigation'><a rel="parent" title="2. Built-In Objects"
  href="builtin.html"><img src='../icons/up.png'
  border='0' height='32'  alt='Up One Level' width='32' /></A></td>
<td class='online-navigation'><a rel="next" title="3. Python Runtime Services"
  href="python.html"><img src='../icons/next.png'
  border='0' height='32'  alt='Next Page' width='32' /></A></td>
<td align="center" width="100%">Python Library Reference</td>
<td class='online-navigation'><a rel="contents" title="Table of Contents"
  href="contents.html"><img src='../icons/contents.png'
  border='0' height='32'  alt='Contents' width='32' /></A></td>
<td class='online-navigation'><a href="modindex.html" title="Module Index"><img src='../icons/modules.png'
  border='0' height='32'  alt='Module Index' width='32' /></a></td>
<td class='online-navigation'><a rel="index" title="Index"
  href="genindex.html"><img src='../icons/index.png'
  border='0' height='32'  alt='Index' width='32' /></A></td>
</tr></table>
<div class='online-navigation'>
<b class="navlabel">Previous:</b>
<a class="sectref" rel="prev" href="module-exceptions.html">2.4 Built-in Exceptions</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="builtin.html">2. Built-In Objects</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="python.html">3. Python Runtime Services</A>
</div>
</div>
<hr />
<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
</DIV>
<!--End of Navigation Panel-->
<ADDRESS>
See <i><a href="about.html">About this document...</a></i> for information on suggesting changes.
</ADDRESS>
</BODY>
</HTML>