input: def create_linked_list():
      """Create a linked list using Python classes and demonstrate its operation with nodes.
      >>> node1 = Node(1)
      >>> node2 = Node(2)
      >>> node3 = Node(3)
      >>> linked_list = LinkedList()
      >>> linked_list.head = node1
      >>> node1.next = node2
      >>> node2.next = node3
      >>> linked_list.print_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
output:     
      def append(self, data):
          new_node = Node(data)
          if self.head is None:
              self.head = new_node
              return
          last_node = self.head
          while last_node.next:
              last_node = last_node.next
          last_node.next = new_node
  