DLLGet.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
    
    def get_value(self, index):
        if index < 0 or index >= self.length:
            return None
        temp = self.head
        if index < self.length/2:
            for _ in range(index):
                temp = temp.next
        else:
            temp = self.tail
            for _ in range(self.length - 1, index, -1):
                temp = temp.prev
        return temp.value

my_dll = DoublyLinkedList(4)
my_dll.append(5)
my_dll.append(6)
print(my_dll.get_value(0))