CIT PYTHON COHORT THREE
  • CIT Python Cloud Software Engineering
  • week one
    • What is Python
    • Python Syntax
    • variables
    • Numbers / Integers
  • week Two
    • Control Flow Statements
      • If Statements
      • For Loops
      • While Loops
      • Break and Continue Statements
    • Operators
      • Assignment Operators
      • Arithmetic Operators
      • Comparison Operators
      • Logical Operators
      • Bitwise Operators
      • Identity Operators
      • Membership Operators
    • Data Types
      • Strings
      • Numbers
      • Booleans
      • Lists
      • Dictionaries
      • Tuples
      • Sets
  • Week 3
    • Functions
      • Function Arguments
      • Python Recursion
      • Python Anonymous/Lambda Function
    • Object Oriented Programming
      • Classes
      • Inheritance
      • Polymorphism
      • Abstraction
      • Encapsulation
    • Python Modules
      • Python Packages
      • Python Built-in Modules
      • Python Standard Library
      • Python Third Party Modules
    • Python Exceptions
      • Python Try Except
      • Python Raise
      • Python Assert
      • Python User-defined Exceptions
  • Week 4 - File Handling
  • Week6
    • Data Structures and Algorithms
      • DSA Introduction
      • What is an Algorithm?
      • Data Structures and Types
      • Stack
      • Queue
      • Linked List
      • Bubble Sort Algorithm
      • Selection Sort Algorithm
      • Insertion Sort Algorithm
      • Merge Sort Algorithm
      • Quick Sort Algorithm
  • Week8
    • Cryptography
      • Reverse Cipher
      • Caesar Cipher
      • Hash Functions
        • Applications of Hash Functions
        • Examples of Hash Functions
  • Assignments and Solutions
    • Loops
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  • Representation of Linked List
  • Linked List Applications

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  1. Week6
  2. Data Structures and Algorithms

Linked List

PreviousQueueNextBubble Sort Algorithm

Last updated 2 years ago

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A linked list is a linear data structure that includes a series of connected nodes. Here, each node stores the data and the address of the next node. For example,

Linked list data structure

You have to start somewhere, so we give the address of the first node a special name called HEAD. Also, the last node in the linked list can be identified because its next portion points to NULL.

Linked lists can be of multiple types: singly, doubly, and circular linked list. In this article, we will focus on the singly linked list.

NOTE: You might have played the game Treasure Hunt, where each clue includes the information about the next clue. That is how the linked list operates.

Representation of Linked List

Let's see how each node of the linked list is represented. Each node consists:

  • A data item

  • An address of another node

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

class LinkedList:
    def __init__(self):
        self.head = None

    def print_list(self):
        temp = self.head
        while temp:
            print(temp.data)
            temp = temp.next

if __name__ == '__main__':
    llist = LinkedList()
    llist.head = Node(1)
    second = Node(2)
    third = Node(3)

    llist.head.next = second
    second.next = third

    llist.print_list()

Linked List Applications

Linked lists are used in many applications. Some of them are:

  • Dynamic memory allocation

  • Implemented in stack and queue

  • In undo functionality of softwares

  • Hash tables, Graphs