def RegisterCycleHandler(self,handler):
        """ Register handler that will be called on every Dispatcher.Process() call. """
        if self._cycleHandlers not in handler: self._cycleHandlers.append(handler)
dataset/ETHPy150Open CouchPotato/CouchPotatoServer/libs/xmpp/dispatcher.py/Dispatcher.RegisterCycleHandler/swapped operands of `not in`