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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 strip_source(self):
 		"""The source of the interaction with the strip. 		If the source is 		:attr:`~libinput.constant.TabletPadStripAxisSource.FINGER`, libinput 		sends a strip position value of -1 to terminate the current interaction. 		For events not of type 		:attr:`~libinput.constant.EventType.TABLET_PAD_STRIP`, this property 		raises :exc:`AttributeError`. 		Returns: 			~libinput.constant.TabletPadStripAxisSource: The source of 			the strip interaction. 		Raises: 			AttributeError 		"""


		if self.type != EventType.TABLET_PAD_STRIP:
			raise AttributeError(_wrong_prop.format(self.type))
		return self._libinput.libinput_event_tablet_pad_get_strip_source(
			self._handle)