python-执行时间问题

Question

我能够通过第一个功能....但是第二个功能未运行.... 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：执行时，它给了我node的值，但是给了我错误。 在get操作函数中i = 0的值。 我不知道，为什么它没有增加。

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

按照下面的说明添加打印说明，然后告诉我它说了什么。 self.actions可能是None类型，或者不是类似于列表的对象。 您可能要检查==无，就像另一个。

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

所以问题可能出在这里：

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

使self.actions ==无

您可以使用以下方法进一步调试：

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

检查问题是否正常..如果是这样，则searchFunction找不到路径或出现问题，并且返回None。