class Node:
	def __init__(self, parent, state_tuple, cost):
		self._cost = cost
		self._action = state_tuple[0]
		self._state = state_tuple[1]
		self._parent = parent

	def get_predecessor(self):
		return self._parent

	def set_predecessor(self, predecessor):
		self._parent = predecessor

	def __lt__(self, other):
		return self._cost < other._cost