Python实现针对给定单链表删除指定节点的方法

#!usr/bin/env python
#encoding:utf-8
'''''
__Author__:沂水寒城
功能：给定一个单链表删除指定节点
'''
class Node(object):
  '''''
  节点类
  '''
  def __init__(self,data):
    self.num=data
    self.next=None
class DeleteNode():
  '''''
  实现删除指定节点功能
  '''
  def delete_node(self,node):
    node.num=node.next.num
    node.next=node.next.next
class PrintNode():
  '''''
  输出指定节点为起始节点的链表
  '''
  def print_node(self,node):
    res_list=[]
    while node:
      res_list.append(str(node.num))
      node=node.next
    print '->'.join(res_list)
if __name__ == '__main__':
  node1=Node(90)
  node2=Node(34)
  node3=Node(89)
  node4=Node(77)
  node5=Node(23)
  node1.next=node2
  node2.next=node3
  node3.next=node4
  node4.next=node5
  print 'init single linknode is:'
  printnode=PrintNode()
  printnode.print_node(node1)
  delete=DeleteNode()
  delete.delete_node(node4)
  print 'after delete node,the single linknode is:'
  printnode.print_node(node1)