Python Program to Display all the Nodes in a Linked List using Recursion

This is a Python program to display the nodes of a linked list using recursion.

The program creates a linked list using data items input from the user and displays it.

1. Create a class Node.
2. Create a class LinkedList.
3. Define methods append and display inside the class LinkedList to append data and display the linked list respectively.
4. Define methods display and display_helper.
5. display calls display_helper to display the linked list recursively.
6. Create an instance of LinkedList, append data to it and display the list.

Here is the source code of a Python program to display the nodes of a linked list using recursion. The program output is shown below.

class Node:
    def __init__(self, data):
       self.data = data
       self.next = None
 
class LinkedList:
    def __init__(self):
        self.head = None
        self.last_node = None
 
    def append(self, data):
        if self.last_node is None:
            self.head = Node(data)
            self.last_node = self.head
        else:
            self.last_node.next = Node(data)
            self.last_node = self.last_node.next
 
    def display(self):
        self.display_helper(self.head)
 
    def display_helper(self, current):
        if current is None:
            return
 
        print(current.data, end = ' ')
        self.display_helper(current.next)
 
a_llist = LinkedList()
n = int(input('How many elements would you like to add? '))
for i in range(n):
    data = int(input('Enter data item: '))
    a_llist.append(data)
 
print('The linked list: ', end = '')
a_llist.display()

1. An instance of LinkedList is created.
2. The user is asked for the number of elements they would like to add. This is stored in n.
3. Using a loop, data from the user is appended to the linked list n times.
4. The linked list is displayed by calling the method display.

Case 1:
How many elements would you like to add? 3
Enter data item: 7
Enter data item: 2
Enter data item: 1
The linked list: 7 2 1 
 
Case 2:
How many elements would you like to add? 1
Enter data item: 2
The linked list: 2 
 
Case 3:
How many elements would you like to add? 5
Enter data item: 4
Enter data item: 2
Enter data item: 3
Enter data item: 5
Enter data item: 1
The linked list: 4 2 3 5 1

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