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
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.