http://code.activestate.com/recipes/tags/classes-mixins-method/2017-04-20T23:34:50-07:00ActiveState Code Recipes2017-04-20T23:34:50-07:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/580788-implementing-class-based-callbacks-in-python/

<p style="color: grey"> Python recipe 580788 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/callbacks/">callbacks</a>, <a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/functions/">functions</a>, <a href="/recipes/tags/methods/">methods</a>, <a href="/recipes/tags/objects/">objects</a>, <a href="/recipes/tags/programming/">programming</a>, <a href="/recipes/tags/python/">python</a>). </p> <p>This is a follow-on to this recently posted recipe:</p> <p>Implementing function-based callbacks in Python: <a href="https://code.activestate.com/recipes/580787-implementing-function-based-callbacks-in-python/?in=user-4173351" rel="nofollow">https://code.activestate.com/recipes/580787-implementing-function-based-callbacks-in-python/?in=user-4173351</a></p> <p>This new recipe shows how to create and use callbacks in Python, using classes with methods, instead of plain functions, as was done in the recipe linked above. All other points such as reasons and benefits for using callbacks, are more or less the same as mentioned in the previous recipe, except that class instances can carry state around, so to that extent, the two approaches are different.</p> <p><a href="https://jugad2.blogspot.in/2017/04/python-callbacks-using-classes-and.html" rel="nofollow">https://jugad2.blogspot.in/2017/04/python-callbacks-using-classes-and.html</a></p>

2014-12-22T23:38:38-08:00Lance Spencehttp://code.activestate.com/recipes/users/4191386/http://code.activestate.com/recipes/578988-money-game/

<p style="color: grey"> Python recipe 578988 by <a href="/recipes/users/4191386/">Lance Spence</a> (<a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/games/">games</a>). </p> <p>I created this simple program as a possible start to something larger while I continue to learn Python. It's a simple program that can be used to help young kids learn to count change in US currency.</p>

2012-05-30T10:00:21-07:00Evert van de Waalhttp://code.activestate.com/recipes/users/4182118/http://code.activestate.com/recipes/578137-tracking-child-classes/

<p style="color: grey"> Python recipe 578137 by <a href="/recipes/users/4182118/">Evert van de Waal</a> (<a href="/recipes/tags/child/">child</a>, <a href="/recipes/tags/classes/">classes</a>). </p> <p>This recipe allows a base class to keep track of the child classes that inherit from it using a metaclass.</p>

2011-08-12T23:35:45-07:00Eric Snowhttp://code.activestate.com/recipes/users/4177816/http://code.activestate.com/recipes/577761-simple-abstract-constants-to-use-when-abstractprop/

<p style="color: grey"> Python recipe 577761 by <a href="/recipes/users/4177816/">Eric Snow</a> (<a href="/recipes/tags/attributes/">attributes</a>, <a href="/recipes/tags/classes/">classes</a>). </p> <p>Use these instead of abstract properties when you don't plan on the abstract attribute being implemented with a property. And you can still give your attribute a docstring!</p>

2011-10-05T18:38:43-07:00Eric Snowhttp://code.activestate.com/recipes/users/4177816/http://code.activestate.com/recipes/577822-turn-a-function-into-a-class/

<p style="color: grey"> Python recipe 577822 by <a href="/recipes/users/4177816/">Eric Snow</a> (<a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/functions/">functions</a>). </p> <p>The only catch is that the function has to return locals() at the end. And it doesn't do the __prepare__ part of 3.x metaclasses.</p>

2011-08-04T21:38:40-07:00Eric Snowhttp://code.activestate.com/recipes/users/4177816/http://code.activestate.com/recipes/577813-make-a-classs-name-available-in-its-definition-bod/

<p style="color: grey"> Python recipe 577813 by <a href="/recipes/users/4177816/">Eric Snow</a> (<a href="/recipes/tags/classes/">classes</a>). </p> <p>Since a class object is created <em>after</em> the body is executed, it can't be available to the class body. Even the name is unavailable, at least by default. However, you can use the <code>__prepare__()</code> method in a metaclass to stick it in there. This recipe is a simple demonstration of how.</p>

2011-01-24T18:40:51-08:00Kevin L. Sitzehttp://code.activestate.com/recipes/users/4173535/http://code.activestate.com/recipes/577551-trace-decorator-for-debugging/

<p style="color: grey"> Python recipe 577551 by <a href="/recipes/users/4173535/">Kevin L. Sitze</a> (<a href="/recipes/tags/classes/">classes</a>, <a href="/recipes/tags/debug/">debug</a>, <a href="/recipes/tags/debugging/">debugging</a>, <a href="/recipes/tags/decorators/">decorators</a>, <a href="/recipes/tags/functions/">functions</a>, <a href="/recipes/tags/inspection/">inspection</a>, <a href="/recipes/tags/modules/">modules</a>, <a href="/recipes/tags/trace/">trace</a>). Revision 2. </p> <p>This package provides a decorator for tracing function and method calls in your applications. The tracing capabilities are managed through the logging package, and several mechanisms are provided for controlling the destination of the trace output.</p> <p>It also provides functionality for adding decorators to existing classes or modules.</p>