def h_value(self, end):
""" Returns heuristic cost (distance) from here to the end, for A*.
"""
miles_to_end = find_miles(self, end)
return miles_to_end
def distance(self):
""" Returns the distance, in miles, between this node and its parent.
"""
if self.parent:
return find_miles(self, self.parent) + self.parent.distance
return 0.0
