Python Program For Writing A Function To Delete A Linked List

Algorithm For Python:
In Python, automatic garbage collection happens, so deleting a linked list is easy. Just need to change head to null.

Implementation:

Python3

# Python3 program to delete all
# the nodes of singly linked list

# Node class
class Node:

    # Function to initialize the 
    # node object
    def __init__(self, data):

        # Assign data
        self.data = data

        # Initialize next as null  
        self.next = None  


# Constructor to initialize the 
# node object
class LinkedList:

    # Function to initialize head
    def __init__(self):
        self.head = None

    def deleteList(self):

        # Initialize the current node
        current = self.head
        while current:

            # Move next node
            prev = current.next  

            # Delete the current node
            del current.data

            # Set current equals prev node
            current = prev

        # In python garbage collection happens
        # therefore, only self.head = None
        # would also delete the link list 

    # Push function to add node in 
    # front of llist
    def push(self, new_data):

        # Allocate the Node &
        # Put in the data
        new_node = Node(new_data)

        # Make next of new Node as head
        new_node.next = self.head

        # Move the head to point to the 
        # new Node
        self.head = new_node

# Use push() to construct list
# 1-> 12-> 1-> 4-> 1
if __name__ == '__main__':

    llist = LinkedList()
    llist.push(1)
    llist.push(4)
    llist.push(1)
    llist.push(12)
    llist.push(1)

    print("Deleting linked list")
    llist.deleteList()

    print("Linked list deleted")
# This code is contributed by Shrikant13

Output:

Deleting linked list
Linked list deleted

Time Complexity: O(n) 
Auxiliary Space: O(1)

Please refer complete article on Write a function to delete a Linked List for more details!

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