vamsitallapudi

class Node:
    def __init__(self, data):
        self.data = data  # assigning the data passed
        self.next = None  # initializing the node as null


class LinkedList:
    def __init__(self):
        self.head = None

vamsitallapudi

class Node:
    def __init__(self, data):
        self.data = data  # assigning the data passed
        self.next = None  # initializing the node as null


class LinkedList:
    def __init__(self):
        self.head = None

vamsitallapudi

# insertion of new node at front of linked list
def insert_at_front(head, data):
    # creating new node to be inserted
    new_node = Node(data)
    new_node.next = head  # pointing the new node's next to head
    head = new_node  # making the new node as head
    return head

vamsitallapudi

def insert_at_end(head, data):
    new_node = Node(data)
    current = head
    while current.next:  # traversing till the last node
        current = current.next
    # change the next of last node
    current.next = new_node
    return head

vamsitallapudi

def insert_at_pos(head, data, position):
    # edge case: check if pos is 0
    new_node = Node(data)
    if position is 0:
        new_node.next = head
        head = new_node
        return head

    pos = 0
    new_node = Node(data)

vamsitallapudi

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


class SinglyLinkedList:
    def __init__(self):
        self.head = None

vamsitallapudi

def delete_at_start(head):
    # edge case: return if head is null
    if not head:
        return None
    head = head.next  # moving head to next node
    return head

vamsitallapudi

def delete_at_end(head):
    if not head:
        return None

    prev_node = head
    while prev_node.next.next:
        prev_node = prev_node.next
    prev_node.next = None
    return head

vamsitallapudi

def delete_at_pos(head, position):
    if not head:
        return None

    if position is 0:
        return head.next

    prev_node = head
    curr_node = head.next
    current_pos = 1

vamsitallapudi

class Node:
    def __init__(self, data=None):
        self.data = data
        self.next = None
"""
 Deleting a node at start. 
"""


def delete_at_start(head):