insert-a-node-at-the-tail-of-a-linked-list.py

"""
 Insert Node at the end of a linked list 
 head pointer 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
"""

def Insert(head, data):
    node = head
    if head is None:
        head = Node(data)
        return head
    
    while  node.next != None:
        node = node.next
    
    node.next = Node(data)
    
    return head