# -*- coding:utf-8 -*-
#构建节点
class Node(object):
def __init__(self,elem):
self.elem = elem
self.next = None
#构建链表
class SingleLinkList():
def __init__(self,node = None):
self._head = node
def is_empty(self):
return self._head == None
def length(self):
#cur游标，用来移动遍历节点
cur = self._head
count = 0
while cur != None:
count += 1
cur = cur.next
return count
#遍历链表
def travel(self):
cur = self._head
while cur != None:
print(cur.elem,end = ' ')
cur = cur.next
print()
#链表头添加
def add(self,item):
cur = self._head
node = Node(item)
cur,node.next = node,cur
self._head = cur
def append(self,item):
node = Node(item)
if self._head == None:
self._head = node
else:
cur = self._head
while cur.next != None:
cur = cur.next
cur.next = node
def insert(self,pos,item):
if pos <= 0:
self.add(item)
elif pos > (self.length()-1):
self.append(item)
else:
pre = self._head
count = 0
while count < (pos-1):
count += 1
pre = pre.next
node = Node(item)
node.next = pre.next
pre.next = node
def remove(self,item):
cur = self._head
pre = None
while cur != None:
if cur.elem == item:
if cur == self._head:
self._head = cur.next
else:
pre.next = cur.next
return
else:
pre,cur = cur,cur.next
#查找数据是否存在
def search(self,item):
cur = self._head
while cur != None:
if cur.elem == item:
return True
cur = cur.next
return False
if __name__ == '__main__':
newList = SingleLinkList()