Insert a node at a specific position in a linked list:

"""
 Insert Node at a specific position in a linked list
 head input could be None as well for empty list
 Node is defined as

 class Node(object):

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

 return back the head of the linked list in the below method. 
"""
#This is a "method-only" submission.
#You only need to complete this method.
def InsertNth(head, data, position):
    if head == None:
        return Node(data,None)
    curr_node = head
    if position == 0:
        return Node(data,curr_node)
    while position!=1:
        curr_node = curr_node.next
        position -=1
    x = Node(data,curr_node.next)
    curr_node.next = x
    return head