insertion at specific position in LL

# Define the Node class if not already defined
class Node:
    def _init_(self, data):
        self.data = data
        self.next = None

# Function to insert at a specific position
def insert_at_position(head, value, position):
    new_node = Node(value)

    if position == 1:
        new_node.next = head
        return new_node

    current = head
    for i in range(1, position - 1):
        if current is None:
            print("Invalid position")
            return head
        current = current.next

    if current is None:
        print("Invalid position")
        return head

    new_node.next = current.next
    current.next = new_node

    return head

# Optional: Function to print the linked list
def print_linked_list(head):
    current = head
    while current:
        print(current.data, end=" -> ")
        current = current.next
    print("None")

# Example usage
# Assuming you already have a linked list starting with 'head'
head = Node(1)
head.next = Node(2)
head.next.next = Node(3)

head = insert_at_position(head, 888, 4)
print_linked_list(head)