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That is to say that you can use Cheetah in with -object-oriented principles <em>or</em> you can use Cheetah in a strictly functional -sense, like Python, Cheetah does not place restrictions on these barriers.</p> -<p>While Cheetah is not strictly Python, it was designed as such to interoperate, -particularly with the notion of classes, with Python itself. In effect you can -define Python classes that inherit and extend from Cheetah-derived classes and -vice versa. For this, Cheetah defines a few <strong>directives</strong> (denoted with the <code>#</code> -hash-mark) that are of some help, the most important one being the <code>#extends</code> -directive, with others playing important roles like <code>#import</code>, <code>#attr</code> and <code>#super</code></p> -<p>In this recipe/tutorial I intend to explain and define a few key inheritance -patterns with Cheetah, being:</p> -<ul> -<li>A Cheetah Template inheriting from Python</li> -<li>Python inheriting from a Cheetah Template</li> -<li>Cheetah Templates and "<em>mixins</em>"</li> -</ul> -<p>This document also operates on the assumption that the reader is at least -somewhat familiar with the basic tenets of object-oriented programming in -Python.</p> -<h2>Cheetah inheriting from Python</h2> -<p>Whether or not you are aware of it, Cheetah templates are always inheriting from -a Python class by default. Unless otherwise denoted, Cheetah templates are compiled -to Python classes that subclass from the <code>Cheetah.Template.Template</code> class.</p> -<p>What if you would like to introduce your own Template base class? Easily acheived by -defining your own Template class in a Python module, for example:</p> -<pre><code>import Cheetah.Template - -class CookbookTemplate(Cheetah.Template.Template): - _page = 'Cookbook' - author = 'R. Tyler Ballance' - def pageName(self): - return self._page or 'Unknown' -</code></pre> -<p><strong>Figure 1. cookbook.py</strong></p> -<p>For this example, I want all my subclasses of the <code>CookbookTemplate</code> to define a -page author which will be used in some shared rendering code, to accomplish this -my templates will need to subclass from <code>CookbookTemplate</code> explicitly instead of -implicitly subclassing from <code>Cheetah.Template.Template</code></p> -<pre><code>#import cookbook -#extends cookbook.CookbookTemplate -#attr author = 'Tavis Rudd' - -## The rest of my recipe template would be below -</code></pre> -<p><strong>Figure 2. recipe1.tmpl</strong></p> -<p><span style="float: right; clear: both;"><em>Last edited: Sun May 31 18:40:24 2009 </em></span></p> - </div> - - <div id="rightcontent"> - <img style="margin-top:-9px; margin-left: -5px;" src="../../images/top2.jpg" alt="" /> - - <div id="twitter_div"> - <h2 class="sidebar-title">Twitter Updates</h2> - <ul id="twitter_update_list"></ul> - - <a href="http://twitter.com/cheetahtemplate" id="twitter-link" style="display:block;text-align:right;">follow Cheetah on Twitter</a> - </div> - - - <img style="padding-top:5px; margin-left:-5px; margin-bottom:-4px;" src="../../images/specs_bottom.jpg" alt="" /> - </div> - - <br clear="all"/> - <br/> - - <a href="http://www.python.org" target="_blank"><img src="../../images/python-logo.gif" border="0" alt="Python-powered" title="Python-powered" align="right"/></a> - <br clear="all"/> - <br/> - <div id="footer"> - © 2006 Design by <a href="http://www.studio7designs.com">Studio7designs.com</a> - </div> - - - <script type="text/javascript" src="http://twitter.com/javascripts/blogger.js"></script> - <script type="text/javascript" src="http://twitter.com/statuses/user_timeline/cheetahtemplate.json?callback=twitterCallback2&count=5"></script> - </body> -</html> - - - - - - - - |