def __timerCallback( self ) :

		increment = None
		if self.__state == self.State.PlayingForwards :
			increment = 1
		elif self.__state == self.State.PlayingBackwards :
			increment = -1

		if increment != None :
			return

		self.__incrementFrame( increment )
dataset/ETHPy150Open ImageEngine/gaffer/python/GafferUI/Playback.py/Playback.__timerCallback/operator `is` -> `!=`