Queue Implementation using Python

Code is given below.

#QUEUE 

class queue:

    def __init__(self):

        self.l1=[]

        

    def add(self,data):

        if data not in self.l1:

            self.l1.append(data)

        else:

            print("Data is alreday there in queue....")

    def remove(self):

        self.l1.pop(0)

    

    def display(self):

        for i in self.l1:

            print(i,end=' ')

        print()

A=queue()

while True:

    print("\nPress\n1.ADD ITEM\n2.REMOVE\n3.DISPLAY\n4.EXIT\n")

    ch=int(input("Enter your choice : "))

    if ch==1:

        number=int(input("Enter the number : "))

        A.add(number)

    elif ch==2:

        A.remove()

    elif ch==3:

        print("Queue Elements are....")

        A.display()

    elif ch==4:

        break

#Doble Ended Queue

class doubleEndedQueue:

    def __init__(self):

        self.l1=[]

        

    def addAtFront(self,data):

        if data not in self.l1:

            self.l1.insert(0,data)

        else:

            print("Data is alreday there in queue....")

            

    def addAtEnd(self,data):

        if data not in self.l1:

            self.l1.append(data)

        else:

            print("Data is already there in queue....")

            

    def deleteAtFront(self):

        self.l1.pop(0)

        

    def deleteAtEnd(self):

        self.l1.pop(len(self.l1)-1)

    

    def display(self):

        for i in self.l1:

            print(i,end=' ')

        print()

A=doubleEndedQueue()

while True:

    print("\nPress\n1.Add at front\n2.Add at end\n3.Remove at front\n4.Remove at end\n5.DISPLAY\n6.EXIT\n")

    ch=int(input("Enter your choice : "))

    if ch==1:

        number=int(input("Enter the number : "))

        A.addAtFront(number)

    elif ch==2:

        number=int(input("Enter the number : "))

        A.addAtEnd(number)

    elif ch==3:

        A.deleteAtFront()

    elif ch==4:

        A.deleteAtEnd()

    elif ch==5:

        A.display()

    elif ch==6:

        break

    else:

        pass