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Topic: Linked Lists in Python – Part 1: Introduction and Singly Linked List Basics

---

What is a Linked List?

• A linked list is a linear data structure where each element (called a node) contains:

• The data value.
• A pointer (or reference) to the next node.

• Unlike arrays, linked lists don’t require contiguous memory and can grow dynamically.

---

Why Use Linked Lists?

• Efficient insertions/deletions at the beginning or middle.
• No need for pre-defining size, unlike arrays.
• Used in memory-efficient applications like OS kernels, compilers, and real-time systems.

---

Types of Linked Lists

• Singly Linked List – Each node points to the next.
• Doubly Linked List – Nodes have next and previous pointers.
• Circular Linked List – The last node points back to the head.

---

Basic Structure of a Node

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

---

Building a Singly Linked List

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

    def append(self, data):
        new_node = Node(data)

        if not self.head:
            self.head = new_node
            return

        current = self.head
        while current.next:
            current = current.next
        current.next = new_node

---

Traversing the List

def display(self):
    current = self.head
    while current:
        print(current.data, end=" -> ")
        current = current.next
    print("None")

Usage:

ll = LinkedList()
ll.append(10)
ll.append(20)
ll.append(30)
ll.display()  # Output: 10 -> 20 -> 30 -> None

---

Inserting at the Beginning

def insert_at_beginning(self, data):
    new_node = Node(data)
    new_node.next = self.head
    self.head = new_node

---

Summary

• A singly linked list stores data as a sequence of nodes linked by references.

• Supports dynamic memory usage, fast insertions, and flexible resizing.

• The key is managing node connections safely and efficiently.

---

Exercise

• Implement a method length() that returns the number of nodes in the list.

---

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