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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def startThread(self):
 """Spawns new NSThread to handle notifications."""

        if self._thread is not None:
            return
        self._thread = NSThread.alloc().initWithTarget_selector_object_(self, 'runPowerNotificationsThread', None)
        self._thread.start()