sam-t2/devtools/amd64/html/python/ref/unary.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<link rel="STYLESHEET" href="ref.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="ref.html" title='Python Reference Manual' />
<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="next" href="binary.html" />
<link rel="prev" href="power.html" />
<link rel="parent" href="expressions.html" />
<link rel="next" href="binary.html" />
<meta name='aesop' content='information' />
<title>5.5 Unary arithmetic operations </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="5.4 The power operator"
  href="power.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="5. Expressions"
  href="expressions.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="5.6 Binary arithmetic operations"
  href="binary.html"><img src='../icons/next.png'
  border='0' height='32'  alt='Next Page' width='32' /></A></td>
<td align="center" width="100%">Python Reference Manual</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'><img src='../icons/blank.png'
  border='0' height='32'  alt='' width='32' /></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="power.html">5.4 The power operator</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="expressions.html">5. Expressions</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="binary.html">5.6 Binary arithmetic operations</A>
</div>
<hr /></div>
</DIV>
<!--End of Navigation Panel-->

<H1><A NAME="SECTION007500000000000000000"></A><A NAME="unary"></A>
<BR>
5.5 Unary arithmetic operations
</H1>
<a id='l2h-408' xml:id='l2h-408'></a><a id='l2h-409' xml:id='l2h-409'></a>
<P>
All unary arithmetic (and bit-wise) operations have the same priority:

<P>
<dl><dd class="grammar">
<div class="productions">
<table>
<tr>
    <td><a id='tok-u_expr' xml:id='tok-u_expr'>u_expr</a></td>
    <td>::=</td>
    <td><a class='grammartoken' href="power.html#tok-power">power</a> | "-" <a class='grammartoken' href="unary.html#tok-u_expr">u_expr</a>
              | "+" <a class='grammartoken' href="unary.html#tok-u_expr">u_expr</a> | "~" <a class='grammartoken' href="unary.html#tok-u_expr">u_expr</a></td></tr>
</table>
</div>
<a class="grammar-footer"
  href="grammar.txt" type="text/plain"
  >Download entire grammar as text.</a>
</dd></dl>

<P>
The unary <code>-</code> (minus) operator yields the negation of its
numeric argument.
<a id='l2h-411' xml:id='l2h-411'></a>

<P>
The unary <code>+</code> (plus) operator yields its numeric argument
unchanged.
<a id='l2h-412' xml:id='l2h-412'></a>

<P>
The unary <code>~</code> (invert) operator yields the bit-wise inversion
of its plain or long integer argument.  The bit-wise inversion of
<code>x</code> is defined as <code>-(x+1)</code>.  It only applies to integral
numbers.
<a id='l2h-413' xml:id='l2h-413'></a>

<P>
In all three cases, if the argument does not have the proper type,
a <tt class="exception">TypeError</tt> exception is raised.
<a id='l2h-410' xml:id='l2h-410'></a>
<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="5.4 The power operator"
  href="power.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="5. Expressions"
  href="expressions.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="5.6 Binary arithmetic operations"
  href="binary.html"><img src='../icons/next.png'
  border='0' height='32'  alt='Next Page' width='32' /></A></td>
<td align="center" width="100%">Python Reference Manual</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'><img src='../icons/blank.png'
  border='0' height='32'  alt='' width='32' /></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="power.html">5.4 The power operator</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="expressions.html">5. Expressions</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="binary.html">5.6 Binary arithmetic operations</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>