# A simple Python program to introduce a linked list
# Node class
class Node:
# Function to initialise the node object
def __init__(self, data):
self.data = data # Assign data
self.next = None # Initialize next as null
# Linked List class contains a Node object
class LinkedList:
# Function to initialize head
def __init__(self):
self.head = None
# Code execution starts here
if __name__=='__main__':
# Start with the empty list
llist = LinkedList()
llist.head = Node(1)
second = Node(2)
third = Node(3)
'''
Three nodes have been created.
We have references to these three blocks as head,
second and third
llist.head second third
| | |
| | |
+----+------+ +----+------+ +----+------+
| 1 | None | | 2 | None | | 3 | None |
+----+------+ +----+------+ +----+------+
'''
llist.head.next = second; # Link first node with second
'''
Now next of first Node refers to second. So they
both are linked.
llist.head second third
| | |
| | |
+----+------+ +----+------+ +----+------+
| 1 | o-------->| 2 | null | | 3 | null |
+----+------+ +----+------+ +----+------+
'''
second.next = third; # Link second node with the third node
'''
Now next of second Node refers to third. So all three
nodes are linked.
llist.head second third
| | |
| | |
+----+------+ +----+------+ +----+------+
| 1 | o-------->| 2 | o-------->| 3 | null |
+----+------+ +----+------+ +----+------+
'''