Get the distance beetween 2 nodes

        Args:
            node (object): The other node.

def get_distance(self, node):
        """Get the distance beetween 2 nodes

        Args:
            node (object): The other node.
        """
        delta = (node.pos[0]-self.pos[0], node.pos[1]-self.pos[1])
        return sqrt(delta[0]**2+delta[1]**2)