Comp Sci Exception has occurred: UnboundLocalError local variable 'depth' refer

[shivajikobardan]

Homework Statement

iterative deepening depth first search

Relevant Equations

code given below

This code is for iterative deepening depth first search in python.

# Python dictionary to act as an adjacency list
graph = {
  '7' : ['19','21', '14'],
  '19': ['1', '12', '31'],
  '21': [],
  '14': ['23', '6'],
  '1' : [],
  '12': [],
  '31': [],
  '23': [],
  '6' : []
}
visited=[]
goal='31'
depth=0

depth_limit=2
def dls(visited, graph, node,depth_limit):
    if(node==goal):
            print("goal found")
            return True

   
    if(depth>=0):
        #to print path
        if node not in visited:
            visited.append(node)
       
       

        for neighbor in graph[node]:
            dls(visited, graph, neighbor,depth_limit-1)
       

    return Falsedef iddfs(visited,graph,node):
    while True:
        solution=dls(visited,graph,node,depth_limit)
        if(solution==goal):
            print("Success goal find at depth=",depth)
            print("Path=",visited)    
        depth=depth+1
 
       

print("Following is the Depth-First Search")
iddfs(visited, graph, '7')

There are various pseudocodes available for this problem. They are as follows-:
I did my best to understand and implement the code but I seem to have failed. And it is getting really confusing. Can you help me?

 

[pbuk]

1. Post Python code with the starting tag CODE=Python
2. In line 17 you have

   def dls(visited, graph, node,depth_limit):

   Apart from the inconsistent spacing and the obscure name, do you not think that the value you are searching for should be an argument of the function?
3. In lines 40-44 you are getting confused between depth, which you never initialise, and the global variable depth_limit, which I suggest you rename initial_depth_limit.

 

[berkeman]

Post Python code with the starting tag CODE=Python

I edited the OP to add the Python tag value. Thanks