def insertNode(self, afterNode, newData):
newNode = Node(newData)
if afterNode is None:
return
nextNode = afterNode.next
afterNode.next = newNode
newNode.next = nextNode
self.size += 1
def insertHead(self, newData):
newNode = Node(newData)
if self.head is None:
self.head = newNode
self.size += 1
return
newNode.next = self.head
self.head = newNode