DLLAppend.py

from tkinter.messagebox import NO


class Node:
    def __init__(self, value):
        self.value = value
        self.next = None
        self.prev = None


class DoublyLinkedList:
    def __init__(self, value):
        new_node = Node(value)
        self.head = new_node
        self.tail = new_node
        self.length = 1
    
    def print_list(self):
        temp = self.head
        while temp is not None:
            print(temp.value)
            temp = temp.next

    def append(self, value):
        new_node = Node(value)
        if self.head is None:
            self.head = new_node
            self.tail = new_node
        else:   
            self.tail.next = new_node
            new_node.prev = self.tail
            self.tail = new_node
        self.length += 1
        return True

my_dll = DoublyLinkedList(0)
my_dll.append(1)
my_dll.append(2)
my_dll.print_list()