<!DOCTYPE html PUBLIC
"-//W3C//DTD HTML 4.0 Transitional//EN">
<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=
"node464.html" />
<link rel=
"parent" href=
"module-timeit.html" />
<link rel=
"next" href=
"internet.html" />
<meta name='aesop' content='information'
/>
<title>10.10.2 Examples
</title>
<div id='top-navigation-panel' xml:id='top-navigation-panel'
>
<table align=
"center" width=
"100%" cellpadding=
"0" cellspacing=
"2">
<td class='online-navigation'
><a rel=
"prev" title=
"10.10.1 Command Line Interface"
href=
"node464.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=
"10.10 timeit "
href=
"module-timeit.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=
"11. Internet Protocols and"
href=
"internet.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>
<div class='online-navigation'
>
<b class=
"navlabel">Previous:
</b>
<a class=
"sectref" rel=
"prev" href=
"node464.html">10.10.1 Command Line Interface
</A>
<b class=
"navlabel">Up:
</b>
<a class=
"sectref" rel=
"parent" href=
"module-timeit.html">10.10 timeit
</A>
<b class=
"navlabel">Next:
</b>
<a class=
"sectref" rel=
"next" href=
"internet.html">11. Internet Protocols and
</A>
<!--End of Navigation Panel-->
<H2><A NAME=
"SECTION00121020000000000000000">
Here are two example sessions (one using the command line, one using
the module interface) that compare the cost of using
<tt class=
"function">hasattr()
</tt> vs.
<tt class=
"keyword">try
</tt>/
<tt class=
"keyword">except
</tt> to test for
missing and present object attributes.
<div class=
"verbatim"><pre>
% timeit.py 'try:' ' str.__nonzero__' 'except AttributeError:' ' pass'
100000 loops, best of
3:
15.7 usec per loop
% timeit.py 'if hasattr(str,
"__nonzero__"): pass'
100000 loops, best of
3:
4.26 usec per loop
% timeit.py 'try:' ' int.__nonzero__' 'except AttributeError:' ' pass'
1000000 loops, best of
3:
1.43 usec per loop
% timeit.py 'if hasattr(int,
"__nonzero__"): pass'
100000 loops, best of
3:
2.23 usec per loop
<div class=
"verbatim"><pre>
>>> import timeit
... except AttributeError:
>>> t = timeit.Timer(stmt=s)
>>> print
"%.2f usec/pass" % (
1000000 * t.timeit(number=
100000)/
100000)
... if hasattr(str, '__nonzero__'): pass
>>> t = timeit.Timer(stmt=s)
>>> print
"%.2f usec/pass" % (
1000000 * t.timeit(number=
100000)/
100000)
... except AttributeError:
>>> t = timeit.Timer(stmt=s)
>>> print
"%.2f usec/pass" % (
1000000 * t.timeit(number=
100000)/
100000)
... if hasattr(int, '__nonzero__'): pass
>>> t = timeit.Timer(stmt=s)
>>> print
"%.2f usec/pass" % (
1000000 * t.timeit(number=
100000)/
100000)
To give the
<tt class=
"module">timeit
</tt> module access to functions you
define, you can pass a
<code>setup
</code> parameter which contains an import
<div class=
"verbatim"><pre>
t = Timer(
"test()",
"from __main__ import test")
<div class='online-navigation'
>
<table align=
"center" width=
"100%" cellpadding=
"0" cellspacing=
"2">
<td class='online-navigation'
><a rel=
"prev" title=
"10.10.1 Command Line Interface"
href=
"node464.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=
"10.10 timeit "
href=
"module-timeit.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=
"11. Internet Protocols and"
href=
"internet.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>
<div class='online-navigation'
>
<b class=
"navlabel">Previous:
</b>
<a class=
"sectref" rel=
"prev" href=
"node464.html">10.10.1 Command Line Interface
</A>
<b class=
"navlabel">Up:
</b>
<a class=
"sectref" rel=
"parent" href=
"module-timeit.html">10.10 timeit
</A>
<b class=
"navlabel">Next:
</b>
<a class=
"sectref" rel=
"next" href=
"internet.html">11. Internet Protocols and
</A>
<span class=
"release-info">Release
2.4.2, documentation updated on
28 September
2005.
</span>
<!--End of Navigation Panel-->
See
<i><a href=
"about.html">About this document...
</a></i> for information on suggesting changes.