我正在尝试插入节点" item"在位置"索引"在链接列表中,我有以下代码,对我来说听起来不错,但它无法正常工作。
如果有人可以帮助我,我真的很感激。
class Node:
def __init__(self,initdata):
self.data = initdata
self.next = None
def getData(self):
return self.data
def getNext(self):
return self.next
def setData(self,newdata):
self.data = newdata
def setNext(self,newnext):
self.next = newnext
然后我有:
class UnorderedList:
def __init__(self):
self.head = None
def isEmpty(self):
return self.head ==None
def add(self,newdata):
Temp = Node(newdata)
# What happens here: the Temp.Next is going to connect to the place that head is connected to
Temp.setNext(self.head)
self.head = Temp
def printl(self):
current = self.head
i=""
while current.getNext() != None:
i =i+ "-"+str(current.getData())
current= current.getNext()
i =i+ "-"+str(current.getData())
return i
def insert(self,item,index):
current = self.head
counter = 0
Temp = Node(item)
Prev = None
if index == 0:
Temp.setNext(self.head)
self.head = Temp
else:
while counter < index:
Prev = current
current = current.getNext()
counter = counter + 1
Temp.setNext(Prev.getNext())
Prev.setNext(Temp.getNext())
current.setData = Temp
所以我在这里做一些测试:
mylist = UnorderedList()
mylist.insert(54,0)
mylist.add(31)
mylist.add(77)
mylist.add(17)
mylist.add(93)
mylist.add(26)
print(mylist.printl())
mylist.insert(12,2)
print(mylist.printl())
输出是:
-26-93-17-77-31-54
-26-93-17-77-31-54
如您所见,未添加节点。 你能否告诉我我的代码有什么问题以及如何修复它?
答案 0 :(得分:2)
在insert
功能上,它应为Prev.setNext(Temp)
,之前为&#39;接下来必须是要插入的,而不是下一个:
def insert(self,item,index):
current = self.head
counter = 0
Temp = Node(item)
Prev = None
if index == 0:
Temp.setNext(self.head)
self.head = Temp
else:
while counter < index:
Prev = current
current = current.getNext()
counter = counter + 1
Temp.setNext(Prev.getNext())
Prev.setNext(Temp)
current.setData = Temp