input: def create_linked_list():
      """
      Write code in Python to implement a linked list using classes.
      The function should create a linked list from three predefined nodes and print its values.
  
      Example:
      create_linked_list()
      1
      2
      3
      """
      
      class Node:
          """Node class to represent the node in a linked list"""
          def __init__(self, data):
              self.data = data
              self.next = None
  
      class LinkedList:
          """LinkedList class to represent the entire linked list"""
          def __init__(self):
              self.head = None
          
          def print_list(self):
              node = self.head
              while(node):
                  print(node.data)
                  node = node.next
  
      # Creating a linked list 
      linked_list = LinkedList()
  
      # Creating the nodes
      node1 = Node(1)
      node2 = Node(2)
      node3 = Node(3)
  
      # Linking the nodes
      linked_list.head = node1
      node1.next = node2
      node2.next = node3
  
      # Printing the linked list
      linked_list.print_list()
output:     return linked_list