本文实例为大家分享了Python数据结构之单链表的具体代码，供大家参考，具体内容如下

# 节点类class Node(): __slots__=['_item','_next'] # 限定Node实例的属性 def __init__(self,item): self._item = item self._next = None # Node的指针部分默认指向None def getItem(self): return self._item def getNext(self): return self._next def setItem(self,newitem): self._item = newitem def setNext(self,newnext): self._next=newnext# 单链表class SingleLinkedList(): def __init__(self): self._head = None #初始化链表为空 始终指向链表的头部 self._size = 0 # 链表大小 # 返回链表的大小 def size(self): current = self._head count = 0 while current != None: count += 1 current = current.getNext() return count # 遍历链表 def travel(self): current = self._head while current != None: print(current.getItem()) current = current.getNext() # 检查链表是否为空 def isEmpty(self): return self._head == None # 在链表前端添加元素 def add(self,item): temp = Node(item) # 创建新的节点 temp.setNext(self._head) # 新创建的next指针指向_head self._head = temp # _head指向新创建的指针 # 在链表尾部添加元素 def append(self,item): temp = Node(item) if self.isEmpty(): self._head = temp # 若为空表就直接插入 else: current = self._head while current.getNext() != None: current = current.getNext() # 遍历列表 current.setNext(temp) # 此时current为链表最后的元素，在末尾插入 # 检索元素是否在链表中 def search(self,item): current = self._head founditem = False while current != None and not founditem: if current.getItem() == item: founditem = True else: current = current.getNext() return founditem # 索引元素在表中的位置 def index(self,item): current = self._head count = 0 found = None while current != None and not found: count += 1 if current.getItem() == item: found = True else: current = current.getNext() if found: return count else: return -1 # 返回-1表示不存在 # 删除表中的某项元素 def remove(self,item): current = self._head pre = None while current!=None: if current.getItem() == item: if not pre: self._head = current.getNext() else: pre.setNext(current.getNext()) break else: pre = current current = current.getNext() # 在链表任意位置插入元素 def insert(self,pos,item): if pos <= 1: self.add(item) elif pos > self.size(): self.append(item) else: temp = Node(item) count = 1 pre = None current = self._head while count < pos: count += 1 pre = current current = current.getNext() pre.setNext(temp) temp.setNext(current)if __name__=='__main__': a=SingleLinkedList() for i in range(1,10): a.append(i) print('链表的大小',a.size()) a.travel() print(a.search(6)) print(a.index(5)) a.remove(4) a.travel() a.insert(4,100) a.travel()

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