projects / OpenSPARC-T2-DV / blame
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| 54 | ||
| 55 | <H1><A NAME="SECTION005500000000000000000"> | |
| 56 | 3.5 <tt class="module">atexit</tt> -- | |
| 57 | Exit handlers</A> | |
| 58 | </H1> | |
| 59 | ||
| 60 | <P> | |
| 61 | <A NAME="module-atexit"></A> | |
| 62 | ||
| 63 | <P> | |
| 64 | ||
| 65 | <span class="versionnote">New in version 2.0.</span> | |
| 66 | ||
| 67 | <P> | |
| 68 | The <tt class="module">atexit</tt> module defines a single function to register | |
| 69 | cleanup functions. Functions thus registered are automatically | |
| 70 | executed upon normal interpreter termination. | |
| 71 | ||
| 72 | <P> | |
| 73 | Note: the functions registered via this module are not called when the program is killed by a | |
| 74 | signal, when a Python fatal internal error is detected, or when | |
| 75 | <tt class="function">os._exit()</tt> is called. | |
| 76 | ||
| 77 | <P> | |
| 78 | This is an alternate interface to the functionality provided by the | |
| 79 | <code>sys.exitfunc</code> variable. | |
| 80 | <a id='l2h-437' xml:id='l2h-437'></a> | |
| 81 | <P> | |
| 82 | Note: This module is unlikely to work correctly when used with other code | |
| 83 | that sets <code>sys.exitfunc</code>. In particular, other core Python modules are | |
| 84 | free to use <tt class="module">atexit</tt> without the programmer's knowledge. Authors who | |
| 85 | use <code>sys.exitfunc</code> should convert their code to use | |
| 86 | <tt class="module">atexit</tt> instead. The simplest way to convert code that sets | |
| 87 | <code>sys.exitfunc</code> is to import <tt class="module">atexit</tt> and register the function | |
| 88 | that had been bound to <code>sys.exitfunc</code>. | |
| 89 | ||
| 90 | <P> | |
| 91 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 92 | <td><nobr><b><tt id='l2h-438' xml:id='l2h-438' class="function">register</tt></b>(</nobr></td> | |
| 93 | <td><var>func</var><big>[</big><var>, *args</var><big>[</big><var>, **kargs</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt> | |
| 94 | <dd> | |
| 95 | Register <var>func</var> as a function to be executed at termination. Any | |
| 96 | optional arguments that are to be passed to <var>func</var> must be passed | |
| 97 | as arguments to <tt class="function">register()</tt>. | |
| 98 | ||
| 99 | <P> | |
| 100 | At normal program termination (for instance, if | |
| 101 | <tt class="function">sys.exit()</tt> is called or the main module's execution | |
| 102 | completes), all functions registered are called in last in, first out | |
| 103 | order. The assumption is that lower level modules will normally be | |
| 104 | imported before higher level modules and thus must be cleaned up | |
| 105 | later. | |
| 106 | ||
| 107 | <P> | |
| 108 | If an exception is raised during execution of the exit handlers, a | |
| 109 | traceback is printed (unless <tt class="exception">SystemExit</tt> is raised) and the | |
| 110 | exception information is saved. After all exit handlers have had a | |
| 111 | chance to run the last exception to be raised is re-raised. | |
| 112 | </dl> | |
| 113 | ||
| 114 | <P> | |
| 115 | <div class="seealso"> | |
| 116 | <p class="heading">See Also:</p> | |
| 117 | ||
| 118 | <dl compact="compact" class="seemodule"> | |
| 119 | <dt>Module <b><tt class="module"><a href="module-readline.html">readline</a></tt>:</b> | |
| 120 | <dd>Useful example of <tt class="module">atexit</tt> to read and | |
| 121 | write <tt class="module"><a href="module-readline.html">readline</a></tt> history files. | |
| 122 | </dl> | |
| 123 | </div> | |
| 124 | ||
| 125 | <P> | |
| 126 | ||
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| 128 | <div class='online-navigation'> | |
| 129 | <!--Table of Child-Links--> | |
| 130 | <A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a> | |
| 131 | ||
| 132 | <UL CLASS="ChildLinks"> | |
| 133 | <LI><A href="atexit-example.html">3.5.1 <tt class="module">atexit</tt> Example</a> | |
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| 163 | <b class="navlabel">Previous:</b> | |
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| 166 | <a class="sectref" rel="parent" href="python.html">3. Python Runtime Services</A> | |
| 167 | <b class="navlabel">Next:</b> | |
| 168 | <a class="sectref" rel="next" href="atexit-example.html">3.5.1 atexit Example</A> | |
| 169 | </div> | |
| 170 | </div> | |
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| 172 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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