code: def angle_delta(self):
  		
  
  		if self.type != EventType.GESTURE_PINCH_UPDATE:
  			raise AttributeError(_wrong_prop.format(self.type))
  		return self._libinput.libinput_event_gesture_get_angle_delta(
  			self._handle)
docs: The angle delta in degrees between the last and the current
  		:attr:`~libinput.constant.EventType.GESTURE_PINCH_UPDATE` event.
  
  		For gesture events that are not of type
  		:attr:`~libinput.constant.EventType.GESTURE_PINCH_UPDATE`, this
  		property raises :exc:`AttributeError`.
  
  		The angle delta is defined as the change in angle of the line formed
  		by the 2 fingers of a pinch gesture. Clockwise rotation is represented
  		by a positive delta, counter-clockwise by a negative delta. If e.g.
  		the fingers are on the 12 and 6 location of a clock face plate and
  		they move to the 1 resp. 7 location in a single event then the angle
  		delta is 30 degrees.
  
  		If more than two fingers are present, the angle represents
  		the rotation around the center of gravity. The calculation of
  		the center of gravity is implementation-dependent.
  
  		Returns:
  			float: The angle delta since the last event.
  		Raises:
  			AttributeError