Python单链表的简单实现方法

本文实例讲述了Python单链表的简单实现方法，分享给大家供大家参考。具体方法如下：

通常来说，要定义一个单链表,首先定义链表元素:Element.它包含3个字段:

list:标识自己属于哪一个list
datum:改元素的value
next:下一个节点的位置

具体实现代码如下：

class LinkedList(object):

class Element(object):

def __init__(self,list,datum,next):
     self._list = list
     self._datum = datum
     self._next = next

def getDatum(self):
     return self._datum

datum = property(
     fget = lambda self: self.getDatum())

def getNext(self):
     return self._next

next = property(
     fget = lambda self: self.getNext())

def __init__(self):

self._head = None
   self._tail = None
 def getHead(self):
   return self._head
 head = property(
   fget = lambda self: self.getHead())
 def prepend(self,item):
   tmp = self.Element (self,item,self._head)
   if self._head is None:
     self._tail = tmp
   self._head = tmp

def insert(self, pos, item):
   i = 0
   p = self._head
   while p != None and i < pos -1:
     p = p._next
     i += 1
   if p == None or i > pos-1:
     return -1
   tmp = self.Element(self, item, p._next)
   p._next = tmp
   return 1
 def getItem(self, pos):
   i = 0
   p = self._head
   while p != None and i < pos -1:
     p = p._next
     i += 1
   if p == None or i > post-1:
     return -1
   return p._datum
 def delete(self, pos):
   i = 0
   p = self._head
   while p != None and i < pos -1:
     p = p._next
     i += 1
   if p == None or i > post-1:
     return -1
   q = p._next
   p._nex = q._next
   datum = p._datum
   return datum
 def setItem(self, pos, item):
   i = 0
   p = self._head
   while p != None and i < pos -1:
     p = p._next
     i += 1
   if p == None or i > post-1:
     return -1
   p._datum = item
   return 1
 def find(self, pos, item):
   i = 0
   p = self._head
   while p != None and i < pos -1:
     if p._datum == item:
       return 1
     p = p._next
     i += 1
   return -1
 def empty(self):
   if self._head == None:
     return 1
   return 0
 def size(self):
   i = 0
   p = self._head
   while p != None and i < pos -1:
     p = p._next
     i += 1
   return i

def clear(self):
   self._head = None
   self._tail = None

test = LinkedList()
test.prepend('test0')
print test.insert(1, 'test')
print test.head.datum
print test.head.next.datum

希望本文所述对大家的Python程序设计有所帮助。