<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>5.1.1 Python*Handler Directive Syntax</title> <META NAME="description" CONTENT="5.1.1 Python*Handler Directive Syntax"> <META NAME="keywords" CONTENT="modpython"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="STYLESHEET" href="modpython.css"> <LINK REL="next" href="dir-handlers-prrh.html"> <LINK REL="previous" href="dir-handlers.html"> <LINK REL="up" href="dir-handlers.html"> <LINK REL="next" href="dir-handlers-prrh.html"> </head> <body> <DIV CLASS="navigation"> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td><A href="dir-handlers.html"><img src="icons/previous.gif" border="0" height="32" alt="Previous Page" width="32"></A></td> <td><A href="dir-handlers.html"><img src="icons/up.gif" border="0" height="32" alt="Up One Level" width="32"></A></td> <td><A href="dir-handlers-prrh.html"><img src="icons/next.gif" border="0" height="32" alt="Next Page" width="32"></A></td> <td align="center" width="100%">Mod_python Manual</td> <td><A href="contents.html"><img src="icons/contents.gif" border="0" height="32" alt="Contents" width="32"></A></td> <td><img src="icons/blank.gif" border="0" height="32" alt="" width="32"></td> <td><A href="genindex.html"><img src="icons/index.gif" border="0" height="32" alt="Index" width="32"></A></td> </tr></table> <b class="navlabel">Previous:</b> <a class="sectref" href="dir-handlers.html">5.1 Handlers</A> <b class="navlabel">Up:</b> <a class="sectref" href="dir-handlers.html">5.1 Handlers</A> <b class="navlabel">Next:</b> <a class="sectref" href="dir-handlers-prrh.html">5.1.2 PythonPostReadRequestHandler</A> <br><hr> </DIV> <!--End of Navigation Panel--> <H2><A NAME="SECTION007110000000000000000"> </A> <a name='l2h-134'> </a> <BR> 5.1.1 Python*Handler Directive Syntax </H2> <P> All <b>Python*Handler</b> directives have the following syntax: <P> <code>Python*Handler <i>handler [handler]</i> ...</code> <P> Where <i>handler</i> is a callable object (e.g. a function) that accepts a single argument - request object. <P> Multiple handlers can be specified on a single line, in which case they will be called sequentially, from left to right. Same handler directives can be specified multiple times as well, with the same result - all handlers listed will be executed sequentially, from first to last. If any handler in the sequence returns a value other than <code>apache.OK</code>, then execution of all subsequent handlers is aborted. <P> A <i>handler</i> has the following syntax: <P> <code>module[::object] [module::[object]] ...</code> <P> Where module can be a full module name (package dot notation is accepted), and the optional object is the name of an object inside the module. <P> Object can also contain dots, in which case it will be resolved from left to right. During resolution, if mod_python encounters an object of type <code><class></code>, it will try instantiate it passing it a single argument, a request object. <P> If no object is specified, then it will default to the directive of the handler, all lower case, with the word "<tt class="samp">Python</tt>"removed. E.g. the default object for PythonAuthenHandler would be authenhandler. <P> Example: <P> <dl><dd><pre class="verbatim"> PythonAuthzHandler mypackage.mymodule::checkallowed </pre></dl> <P> For more information on handlers, see Overview of a Handler. <P> Side note: The "::" was chosen for performance reasons. In order for Python to use objects inside modules, the modules first need to be imported. However, if the separator were simply a ".", it would involve a much more complex process of sequentially evaluating every word to determine whether it is a package, module, class etc. Using the (admittedly un-Python-like) "::" takes the time consuming work of figuring out where the module ends and the object inside of it begins away from mod_python resulting in a modest performance gain.. <P> <DIV CLASS="navigation"> <p><hr> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td><A href="dir-handlers.html"><img src="icons/previous.gif" border="0" height="32" alt="Previous Page" width="32"></A></td> <td><A href="dir-handlers.html"><img src="icons/up.gif" border="0" height="32" alt="Up One Level" width="32"></A></td> <td><A href="dir-handlers-prrh.html"><img src="icons/next.gif" border="0" height="32" alt="Next Page" width="32"></A></td> <td align="center" width="100%">Mod_python Manual</td> <td><A href="contents.html"><img src="icons/contents.gif" border="0" height="32" alt="Contents" width="32"></A></td> <td><img src="icons/blank.gif" border="0" height="32" alt="" width="32"></td> <td><A href="genindex.html"><img src="icons/index.gif" border="0" height="32" alt="Index" width="32"></A></td> </tr></table> <b class="navlabel">Previous:</b> <a class="sectref" href="dir-handlers.html">5.1 Handlers</A> <b class="navlabel">Up:</b> <a class="sectref" href="dir-handlers.html">5.1 Handlers</A> <b class="navlabel">Next:</b> <a class="sectref" href="dir-handlers-prrh.html">5.1.2 PythonPostReadRequestHandler</A> <hr> <span class="release-info">Release 2.7.6, documentation updated on August 04, 2001.</span> </DIV> <!--End of Navigation Panel--> </BODY> </HTML>
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