insertnode at head.py

# import math
# import os
# import random
# import re
# import sys

# class SinglyLinkedListNode:
#     def __init__(self, node_data):
#         self.data = node_data
#         self.next = None

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

# def print_singly_linked_list(node, sep, fptr):
#     while node:
#         fptr.write(str(node.data))

#         node = node.next

#         if node:
#             fptr.write(sep)
            
def insertNodeAtHead(llist, data):
    node = SinglyLinkedListNode(data)
    head = llist
    if not head:
        head = node
    else:
        node.next = head
        head = node
    return head
# if __name__ == '__main__':
#     fptr = open(os.environ['OUTPUT_PATH'], 'w')

#     llist_count = int(input())

#     llist = SinglyLinkedList()

#     for _ in range(llist_count):
#         llist_item = int(input())
#         llist_head = insertNodeAtHead(llist.head, llist_item)
#         llist.head = llist_head
    
#     print_singly_linked_list(llist.head, '\n', fptr)
#     fptr.write('\n')
    
#     fptr.close()