Why am I getting object has no attribute?

Question

I have written a code that uses python deque from collections. I have created an adapetr class queue.py that handles queue operations. But I am getting error object has no attribute.

queue.py :

from collections import deque


class Queue:
    def __int__(self):
        self._items = deque()

    def enqueue(self, item):
        self._items.append(item)

    def extend(self, *elements):
        self._items.extend(elements)

    def dequeue(self):
        try:
            return self._items.popleft()
        except IndexError:
            raise IndexError("Dequeue from empty queue") from Queue

    def __len__(self):
        return len(self._items)

    def __contains__(self, item):
        return item in self._items

    def __iter__(self):
        yield from self._items

    def __repr__(self):
        return f"Queue({list(self._items)})"

graph.py :

from queue import Queue


def getNodeName(rootName):
    return input(f"Enter child of node {rootName} : ")


def inputChildren(root):
    print(f"Enter stop to stop entering children for node {root} : ")
    child = list()
    while True:
        data = getNodeName(root)
        if data.lower() == "stop":
            break
        child.append()
    return child


def inputGraph():
    graph = dict()
    queue = Queue()

    queue.enqueue(input("Enter root name : "))

    while len(queue) != 0:
        root = queue.dequeue()
        rootChildren = inputChildren(root)
        queue.extend(rootChildren)

        if len(rootChildren) == 0:
            continue
        else:
            graph[root] = rootChildren

if __name__=="__main__":
    print(inputGraph())

Output :

Enter root name : A
Traceback (most recent call last):
  File "D:\graph.py", line 36, in <module>
    print(inputGraph())
  File "D:\graph.py", line 23, in inputGraph
    queue.enqueue(input("Enter root name : "))
  File "D:\queue.py", line 9, in enqueue
    self._items.append(item)
AttributeError: 'Queue' object has no attribute '_items'

I have tried searching online but cannot figure out why I am getting this error.

Answer 1

from collections import deque


class Queue:
    def __init__(self):
        self._items = deque()

    def enqueue(self, item):
        self._items.append(item)

    def extend(self, *elements):
        self._items.extend(elements)

    def dequeue(self):
        try:
            return self._items.popleft()
        except IndexError:
            raise IndexError("Dequeue from empty queue") from Queue

    def __len__(self):
        return len(self._items)

    def __contains__(self, item):
        return item in self._items

    def __iter__(self):
        yield from self._items

    def __repr__(self):
        return f"Queue({list(self._items)})"


def getNodeName(rootName):
    return input(f"Enter child of node {rootName} : ")


def inputChildren(root):
    print(f"Enter stop to stop entering children for node {root} : ")
    child = list()
    while True:
        data = getNodeName(root)
        if data.lower() == "stop":
            break
        child.append(data)
    return child


def inputGraph():
    graph = dict()
    queue = Queue()

    queue.enqueue(input("Enter root name : "))

    while len(queue) != 0:
        root = queue.dequeue()
        rootChildren = inputChildren(root)
        queue.extend(rootChildren)

        if len(rootChildren) == 0:
            continue
        else:
            graph[root] = rootChildren

    return graph


if __name__=="__main__":
    print(inputGraph())