python单链表中如何插入和输出节点？(代码示例)

class Node:

   def __init__(self,data,nextNode=None):

       self.data = data

       self.nextNode = nextNode

   def getData(self):

       return self.data

   def setData(self,val):

       self.data = val

   def getNextNode(self):

       return self.nextNode

   def setNextNode(self,val):

       self.nextNode = val

class LinkedList:

   def __init__(self,head = None):

       self.head = head

       self.size = 0

   def getSize(self):

       return self.size

   def addNode(self,data):

       newNode = Node(data,self.head)

       self.head = newNode

       self.size+=1

       return True

   def printNode(self):

       curr = self.head

       while curr:

           print(curr.data)

           curr = curr.getNextNode()

myList = LinkedList()

print("Inserting")

print(myList.addNode(5))

print(myList.addNode(15))

print(myList.addNode(25))

print("Printing")

myList.printNode()

print("Size")

print(myList.getSize())