http://code.activestate.com/recipes/users/4185152/2013-02-04T21:12:27-08:00ActiveState Code Recipes2013-02-04T20:55:10-08:00Ilya Pashchenkohttp://code.activestate.com/recipes/users/4185152/http://code.activestate.com/recipes/578449-observer-pattern/

<p style="color: grey"> Python recipe 578449 by <a href="/recipes/users/4185152/">Ilya Pashchenko</a> (<a href="/recipes/tags/oop/">oop</a>). </p> <p>This is a Python implementation of the observer pattern described by Gamma et. al. It defines a one-to many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.</p> <p>The example should output: Setting Data 1 = 10 DecimalViewer: Subject Data 1 has data 10 HexViewer: Subject Data 1 has data 0xa Setting Data 2 = 15 HexViewer: Subject Data 2 has data 0xf DecimalViewer: Subject Data 2 has data 15 Setting Data 1 = 3 DecimalViewer: Subject Data 1 has data 3 HexViewer: Subject Data 1 has data 0x3 Setting Data 2 = 5 HexViewer: Subject Data 2 has data 0x5 DecimalViewer: Subject Data 2 has data 5 Detach HexViewer from data1 and data2. Setting Data 1 = 10 DecimalViewer: Subject Data 1 has data 10 Setting Data 2 = 15 DecimalViewer: Subject Data 2 has data 15</p>

2013-02-04T21:12:27-08:00Ilya Pashchenkohttp://code.activestate.com/recipes/users/4185152/http://code.activestate.com/recipes/578450-factory-pattern/

<p style="color: grey"> Python recipe 578450 by <a href="/recipes/users/4185152/">Ilya Pashchenko</a> (<a href="/recipes/tags/oop/">oop</a>). </p> <p>In the factory pattern you have an object that creates other objects.</p>