Sets the frames per second of the current movie the clock is used for.

		Parameters
		----------
		value : float
			The fps value.

def fps(self,value):
		""" Sets the frames per second of the current movie the clock is used for.

		Parameters
		----------
		value : float
			The fps value.
		"""
		if not value is None:
			if not type(value) == float:
				raise ValueError("fps needs to be specified as a float")
			if value<1.0:
				raise ValueError("fps needs to be greater than 1.0")
		self.__fps = value