aima/search.py
def child_node(self, problem, action):
        "Fig. 3.10"
        next = problem.result(self.state, action)
        return Node(next, self, action,
                    problem.path_cost(self.path_cost, self.state, action, next))
def child_node(self, problem, action):
        "Fig. 3.10"
        next = problem.result(self.state, action)
        return Node(next, self, action,
                    problem.path_cost(self.path_cost, self.state, action, next))
Fig. 3.10