http://code.activestate.com/recipes/users/359004/2003-01-13T09:38:15-08:00ActiveState Code Recipes2003-01-13T09:38:15-08:00Jørgen Cederberghttp://code.activestate.com/recipes/users/359004/http://code.activestate.com/recipes/131499-observer-pattern/

<p style="color: grey"> Python recipe 131499 by <a href="/recipes/users/359004/">Jørgen Cederberg</a> (<a href="/recipes/tags/oop/">oop</a>). Revision 2. </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>

2002-05-23T13:51:38-07:00Jørgen Cederberghttp://code.activestate.com/recipes/users/359004/http://code.activestate.com/recipes/124894-stopwatch-in-tkinter/

<p style="color: grey"> Python recipe 124894 by <a href="/recipes/users/359004/">Jørgen Cederberg</a> (<a href="/recipes/tags/ui/">ui</a>). Revision 2. </p> <p>This is a small implementation of a stopwatch widget in Tkinter. The widget displays a label with minutes:seconds:1/100-seconds. The label is updated every 50 ms, but that can easily be changed. Methods are availble for starting, stopping and resetting the stopwatch. A simple program demonstrates the widget.</p>