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7840285
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0
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2011-10-20T18:16:38.903
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2011-10-20T18:30:00.410
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2011-10-20T18:30:00.410
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2
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<p>For one, you could create a custom subclass of <code>GObject</code>, which provides some <a href="http://www.pygtk.org/articles/subclassing-gobject/sub-classing-gobject-in-python.htm#d0e570" rel="nofollow">custom signals</a>. The following example is a slightly adapted version of the one given in the linked article:</p> <pre><code>import pygtk pygtk.require('2.0') import gobject class Car(gobject.GObject): __gsignals__ = { 'engine-started': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, ()), 'engine-stopped': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, ()), } def __init__(self): gobject.GObject.__init__(self) self._state = 0 def start(self): if not self._state: self._state = 1 self.emit('engine-started') def stop(self): if self._state: self._state = 0 self.emit('engine-stopped') gobject.type_register(Car) def kill_switch(c): def callback(*unused, **ignored): c.stop() return callback def on_start(*unused, **ignored): print "Started..." def on_stop(*unused, **ignored): print "Stopped..." some_car = Car() some_car.connect('engine-started', on_start) some_car.connect('engine-started', kill_switch(some_car)) some_car.connect('engine-stopped', on_stop) some_car.start() </code></pre> <p>Another approach would be to take advantage of one of the many event/signalling packages already on PyPI, for example:</p> <ul> <li><a href="http://pypi.python.org/pypi/zope.event" rel="nofollow">Zope Event</a></li> <li><a href="http://pypi.python.org/pypi/Louie" rel="nofollow">Louie</a></li> <li><a href="http://pydispatcher.sourceforge.net/" rel="nofollow">PyDispatcher</a></li> <li><a href="http://pypi.python.org/pypi/darts.util.events" rel="nofollow">Darts Events</a></li> <li><a href="http://pypi.python.org/pypi/Trellis" rel="nofollow">Trellis</a></li> </ul>
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