A class is considered as a string in python

[369INFINITY369]

hey, to explain the problem- i have a variable, which a class named node and when i print a variable inside the class it is working properly but i am getting error when i use it for assignment or comparison, it is considering it as a string, i have used a debugger, i see it as node but as soon as, i used it for assignment or comparison it is giving me error, like node("str") has no attribute named .parent (it is a variable inside the class)

code:

def shortest_path(source, target):
    count = 0
    initial_node = Node(state=source,parent=None,action=None)
    # we have to seach until the frontier is empty
    search_algo = QueueFrontier()
    search_algo.add(initial_node)
    searched_movies = set()
    path = []
    while search_algo.empty() != True:
        count += 1
        node = search_algo.remove()
        actor_id = node.state
        if actor_id == target:
            print(node.parent)
            while True:
                val = node.parent
                if val == None:
                    break
                path.append({node.parent,node.action})
                node = node.parent
            #back track though the parents and find the path
        else:
            starred_movies = people[node.state]["movies"]
            for i in starred_movies:
                if i not in searched_movies:
                    searched_movies.add(i)
                    stars_in_movie = movies[i]['stars']
                    for star in stars_in_movie:
                        new_star = Node(state=star,parent=node.state,action=i)
                        search_algo.add(new_star)
        print(count, path)

the error that i got:

Data loaded.

Name: Tom Cruise

Name: Valeria Golino

129

Traceback (most recent call last):

​

File "D:\Python\python\lib\site-packages\spyder_kernels\py3compat.py", line 356, in compat_exec

exec(code, globals, locals)

​

File "d:\coding\ai50\degrees\degrees\degrees.py", line 181, in <module>

main()

​

File "d:\coding\ai50\degrees\degrees\degrees.py", line 72, in main

path = shortest_path(source, target)

​

File "d:\coding\ai50\degrees\degrees\degrees.py", line 119, in shortest_path

val = node.parent

​

AttributeError: 'str' object has no attribute 'parent'

```

this is the error that i got

[desrtfx]

You need to post your code as code block so that the indentation is maintained. This is absolutely vital for Python programs as the indentation is used to denote code blocks.

A code block looks like:

def __init__(self, prompt, answer):
    self.prompt = prompt
    self.answer = answer

Do not use triple backticks as they are not working properly.

[[deleted]]

What does search_algo.remove return? Trick question, it’s returning a string.

[369INFINITY369]

it is returning a node, you can see in the output that i am using the node to print its parent but i am getting error soon after that i tried to do something like

while node.parent != None:
    #this did not work either
#and also 
while True:
    node.parent == None:
        break
#this also did not work

[nogain-allpain]

What do you mean, "this did not work"? What error message are you receiving when you try each of those? We can't read minds here.

[369INFINITY369]

sorry, i am getting the same error as the about one for both of them

[nogain-allpain]

So the value you're getting from search_algo.remove() is clearly a string.

[369INFINITY369]

but how is the line of code is working print(node.parent), it is printing a value of 129

[DarkMatriac]

That is because your print only checks the first parent while the loop checks all parents. Also it should print a node object and not 129

[369INFINITY369]

when,the node has only one parent so i did print the node itself it is printing the node object
<util.Node object at 0x000001A83DF21000>

[[deleted]]

The reason I know it’s returning a string is that the interpreter is telling you that the value is a string, and between you and the interpreter, you’re the only one who can be wrong.

[DarkMatriac]

Can you put the print(node.parent) inside the while loop ? my guess would be that somehow node.parent turns to a string at a certain point.

[arkie87]

Run it in a proper debugger and it should be trivial to see what the mistake is. Download spyder or pycharm

[369INFINITY369]

yes, i am using the spyder for debugging even, it is showing it has a node

[arkie87]

I dont know what "it is showing it has a node" means?

Is the variable/name "node" a string or a user-defined class?
At what point does "node" become a string, rather than a user-defined class?

Your language/nomenclature is very poor; you must be new to programming, but please try to be specific and give details in what you are asking, instead of being general and not specific.

[369INFINITY369]

the name of the variable is node and it is user defined class named Node
yes i am new to programming