We will implement doubly linked list using some concepts of object oriented programming in python. Step-by-Step Implementation of Doubly Linked List in Python Therefore, in a doubly-linked list, a node consists of three components: node data, pointer to the next node in node(next pointer), pointer to the former node (previous pointer).įor example, consider a doubly linked list containing four nodes having, four numbers from 1 to 4 in their data part, illustrated in the following image We can conclude that a doubly linked list is a complex type of linked list where a node contains a pointer to the previous as well as the next node in the sequence. It is easier to implement Singly Linked list or Linked list,whereas it is pretty difficult to traverse that in reverse, to overcome this we can utilise Doubly LinkedList, where every node takes an additional pointer to point the former node to the element in addition to the pointer for the next node.Ī doubly linked list has more efficient iteration, particularly if you need to ever iterate in reverse and more efficient deletion of particular nodes.
If the Linked list are empty value of Head will be null.īasic implementation of Linked List in Python is: It is necessary to state that “Head” pointer is not another node but a pointer to the first element of the Linked list. The initial pointer in the Linked list is called Head. Every node contains a key or data element with an extra pointer pointing to the next element in the list. Every element is connected to the subsequent node through a pointer.Įvery element present in the Linked list is known as Node. Different from general Arrays, the Linked list data structure does not have a contiguous memory structure. Linked list is a linear data structure in which each node is an object.
So what exactly is a doubly linked list? Before that let’s have a quick glance at Linked List: What is Linked List? But have you ever thought about how is it even possible? I happen to have an answer this time! Undo and Redo functionality is one of the most important applications of a doubly linked list. Ctrl+Z, can you even survive a day without these keys? Well, Apparently not, undo and redo features are one of the used functionalities in computer engineering.
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