我的蟒蛇狼山羊白菜脚本崩溃python 2.6

Question

我想创建一个脚本，解决狼白菜山羊。每当我运行我的代码python崩溃。我的代码有什么问题导致它无法工作？我试图获得它，以便代码运行，然后打印解决问题的每一步。

search.py​​

class Nodes: 
    def succ(self, n): 
     raise Exception, "Successor undefined" 
    def start(self): 
     raise Exception, "Start undefined" 
    def goal(self, n): 
     raise Exception, "Goal undefined" 

wolf_cabbage_goat.py

depth_first_search.py​​

def depth_first_search(problem, node): 
    if problem.goal(node): return [node] 
    # base case 
    for n_succ in problem.succ(node): 
     sol = depth_first_search(problem, n_succ) 
     if sol: 
      # first path is returned 
      return [node] + sol 

wcg_run.py

import wolf_cabbage_goat 
from depth_first_search import * 

wcg = wolf_cabbage_goat.Wolf_Cabbage_Goat() 
print depth_first_search(wcg, wcg.start()) 

Answer 1

如果错误未解决的参考，我认为这是因为这些：

one_travelers = set(traveler for traveler in node if node[traveler] == side_without_farmer) 

# dangeroos animals 
unsafe = set(['wolf', 'goat']).issubset(lone_travelers) 

你宣布one_travelers和使用lone_travelers。

这是一个很好的做法，发布错误与这样一个问题。你也可以避免这样的错误，如果你使用像pycharm（我喜欢pycharm）好的ide