http://code.activestate.com/recipes/tags/switch-ternary/2016-12-11T16:28:50-08:00ActiveState Code Recipes2016-12-11T16:28:50-08:00Vasudev Ramhttp://code.activestate.com/recipes/users/4173351/http://code.activestate.com/recipes/580730-simulate-cs-switch-statement/

<p style="color: grey"> Python recipe 580730 by <a href="/recipes/users/4173351/">Vasudev Ram</a> (<a href="/recipes/tags/c/">c</a>, <a href="/recipes/tags/features/">features</a>, <a href="/recipes/tags/language/">language</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/switch/">switch</a>). </p> <p>This recipe shows a Python construct that can behave somewhat like C's switch statement. It is not a perfect one-to-one simulation. But it does have some of the features of the C switch. One feature not supported is the fall-through feature in C's switch.</p>

2011-09-02T01:49:40-07:00Jan Kaliszewskihttp://code.activestate.com/recipes/users/4172762/http://code.activestate.com/recipes/577864-fast-and-elegant-switchcase-like-dispatch/

<p style="color: grey"> Python recipe 577864 by <a href="/recipes/users/4172762/">Jan Kaliszewski</a> (<a href="/recipes/tags/case/">case</a>, <a href="/recipes/tags/decorator/">decorator</a>, <a href="/recipes/tags/dispatcher/">dispatcher</a>, <a href="/recipes/tags/performance/">performance</a>, <a href="/recipes/tags/switch/">switch</a>). Revision 4. </p> <p>My approach to that common issue focuses on <strong>efficiency</strong> and <strong>elegant, declarative style</strong> of definition. That's why:</p> <ul> <li>The way switches work is based on unwrapped defaultdict/list lookup.</li> <li>The way you define switches is based on classes and easy-to-use decorators (note that you can use subclassing in a flexible way -- without any negative impact on efficiency!).</li> <li>Its use cases focus on a-lot-of-keys situations and it does not cover the <em>fall-through</em> feature (though you can reach its semantics if you really need that -- by calling class methods...).</li> </ul>

2011-08-24T05:29:15-07:00Lucio Santihttp://code.activestate.com/recipes/users/4178886/http://code.activestate.com/recipes/577858-concrete-class-finder/

<p style="color: grey"> Python recipe 577858 by <a href="/recipes/users/4178886/">Lucio Santi</a> (<a href="/recipes/tags/case/">case</a>, <a href="/recipes/tags/class/">class</a>, <a href="/recipes/tags/design/">design</a>, <a href="/recipes/tags/finder/">finder</a>, <a href="/recipes/tags/match/">match</a>, <a href="/recipes/tags/oop/">oop</a>, <a href="/recipes/tags/pattern/">pattern</a>, <a href="/recipes/tags/suitable/">suitable</a>, <a href="/recipes/tags/switch/">switch</a>). </p> <p>This recipe implements a design pattern useful for performing an object-oriented case analysis for a particular object (or a collection of objects as well). Essentially, it is an alternative to complex if-then-else or switches. Modelling each case with a particular class, the Concrete Class Finder searches for an appropriate case/class that applies to the given object/s. Once found, this class can be used in an homogeneous way, independently of the object/s previously considered.</p>

2010-12-21T04:38:48-08:00Michael Kenthttp://code.activestate.com/recipes/users/1184676/http://code.activestate.com/recipes/577507-a-powerful-yet-simple-switch-like-dispatch-system-/

<p style="color: grey"> Python recipe 577507 by <a href="/recipes/users/1184676/">Michael Kent</a> (<a href="/recipes/tags/dispatcher/">dispatcher</a>, <a href="/recipes/tags/switch/">switch</a>). Revision 2. </p> <p>This module provides a powerful 'switch'-like dispatcher system, using decorators to give a syntax somewhat like that of the switch statement in C. Values for switch cases can be anything comparable via '==', a string for use on the left-hand side of the 'in' operator, or a regular expression. Iterables of these types can also be used.</p>