Python Program to Create a Linked List & Display the Elements in the List

When it is required to create a linked list, and display the elements of this linked list, a method to add values to the linked list, as well as a method to display the elements of a Linked List.

Below is a demonstration for the same −

Example

 Live Demo

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

class my_linked_list:
   def __init__(self):
      self.head = None
      self.last_node = None

   def add_value(self, my_data):
      if self.last_node is None:
         self.head = Node(my_data)
         self.last_node = self.head
      else:
         self.last_node.next = Node(my_data)
         self.last_node = self.last_node.next

   def print_it(self):
      curr = self.head
      while curr is not None:
         print(curr.data)
         curr = curr.next

my_instance = my_linked_list()
n = int(input('How many elements should be added ? '))
for i in range(n):
   data = int(input('Enter a data value : '))
   my_instance.add_value(data)
print('The linked list is : ')
my_instance.print_it()

Output

How many elements should be added ? 4
Enter a data value : 6
Enter a data value : 7
Enter a data value : 8
Enter a data value : 9
The linked list is :
6
7
8
9

Explanation

• The ‘Node’ class is created.

• Another ‘my_linked_list’ class with required attributes is created.

• It has an ‘init’ function that is used to initialize the first element, i.e the ‘head’ to ‘None’ and last node to ‘None’.

• Another method named ‘add_value’ is defined, that is used to add data to the linked list.

• Another method named ‘print_it’ is defined that is used to display the linked list data on the console.

• An object of the ‘my_linked_list’ class is created.

• The user input is taken for the number of elements in the linked list.

• This range is iterated over, and the methods are called on it to add data.

• This is displayed on the console using the ‘print_it’ method.