# move in X direction step_x = 1 if tx > x else -1 while x != tx: x += step_x if self.nodes[(x, y)] != "up": return None, f"Node (x,y) is down — path blocked" path.append((x, y))

path = [] x, y = src tx, ty = dst

> send 0,0 7,7 Path: (0,0) -> (1,0) -> (2,0) -> (3,0) -> (4,0) -> (5,0) -> (6,0) -> (7,0) -> (7,1) -> (7,2) -> (7,3) -> (7,4) -> (7,5) -> (7,6) -> (7,7) Status: Success