python-执行时间问题

Question

我能够去通过第一个功能....但第二FUNC没有运行....的getAction

def registerInitialState(self, state): 
    """ 
    This is the first time that the agent sees the layout of the game board. Here, we 
    choose a path to the goal. In this phase, the agent should compute the path to the 
    goal and store it in a local variable. All of the work is done in this method! 

    state: a GameState object (pacman.py) 
    """ 
    if self.searchFunction == None: raise Exception, "No search function provided for SearchAgent" 
    starttime = time.time() 
    problem = self.searchType(state) # Makes a new search problem 
    self.actions = self.searchFunction(problem) # Find a path 
    totalCost = problem.getCostOfActions(self.actions) 
    print('Path found with total cost of %d in %.1f seconds' % (totalCost, time.time() - starttime)) 
    if '_expanded' in dir(problem): print('Search nodes expanded: %d' % problem._expanded) 

    def getAction(self, state): 
    """ 
    Returns the next action in the path chosen earlier (in registerInitialState). Return 
    Directions.STOP if there is no further action to take. 

    state: a GameState object (pacman.py) 
    """ 
    if 'actionIndex' not in dir(self): self.actionIndex = 0 
    i = self.actionIndex 
    self.actionIndex += 1 
    if i < len(self.actions): 
     return self.actions[i]  
    else: 
     return Directions.STOP 


Error: File line 114, in getAction 
    if i < len(self.actions): 
TypeError: len() of unsized object 

这是我的功能：当我执行，它让我感到节点的价值，但不是它，它给了我错误。 get操作函数中的i = 0的值。我不知道，为什么它不增加。

while stack.isEmpty()!= 0: 
     node = stack.pop() 
     print node 

错误：

(5, 5) 
Path found with total cost of 999999 in 0.0 seconds 
Search nodes expanded: 1 
None 

Answer 1

添加打印语句按以下，并告诉我它说什么。 self.actions可能是None类型或不是类似列表的对象。你可能想要像另一个一样检查== None。

self.actionIndex += 1 
print self.actions 
if i < len(self.actions): 
    return self.actions[i]  
else: 
    return Directions.STOP 

所以问题应该是介于浏览：

problem = self.searchType(state) # Makes a new search problem 
print problem 
self.actions = self.searchFunction(problem) # Find a path 

检查：

problem = self.searchType(state) # Makes a new search problem 
self.actions = self.searchFunction(problem) # Find a path 

使self.actions ==无

你可以进一步与调试问题正在起作用..如果是这样，searchFunction没有找到路径或出现问题，并且它正在返回g无。