解释代码：current_node = self.head while current_node.next is not None: current_node = current_node.next current_node.next = new_node new_node.prev = current_node

这段代码是一个双向链表中添加新节点的操作。首先将当前节点指向链表头部，然后通过循环找到链表的最后一个节点，将最后一个节点的 next 指针指向新节点，新节点的 prev 指针指向最后一个节点，完成新节点的添加。

相关问题

检查代码并修改：class Node: def init(self, data): self.data = data self.prev = None self.next = None Class DoublyLinkedlist: # def init(self) self.head = None def remove(self,item): current = self.head previous = None found = False while not found: if current.getData() == item found = True else: previous = current current = current.getNext() if previous == None: self.head = current.getNext() current.prev = None else: previous.setNext(current.getNext()) current.prev = previous

class Node:
def __init__(self, data):
self.data = data
self.prev = None
self.next = None

class DoublyLinkedList: # 类名应该是DoublyLinkedList而不是DoublyLinkedlist
def __init__(self):
self.head = None

def append(self, data):
new_node = Node(data)
if self.head is None:
self.head = new_node
else:
current = self.head
while current.next is not None:
current = current.next
current.next = new_node
new_node.prev = current

def prepend(self, data):
new_node = Node(data)
if self.head is None:
self.head = new_node
else:
self.head.prev = new_node
new_node.next = self.head
self.head = new_node

def delete(self, data):
current = self.head
while current is not None:
if current.data == data:
if current.prev is not None:
current.prev.next = current.next
else:
self.head = current.next
if current.next is not None:
current.next.prev = current.prev
return
current = current.next

def print_list(self):
current = self.head
while current is not None:
print(current.data)
current = current.next

class Node: def __init__(self, data=None, next=None): self.data = data self.next = nextclass LinkedList: def __init__(self): self.head = None def is_empty(self): return self.head is None def add(self, data): new_node = Node(data) new_node.next = self.head self.head = new_node def length(self): count = 0 current = self.head while current is not None: count += 1 current = current.next return count def insert(self, data, position): if position == 0: self.add(data) else: new_node = Node(data) current = self.head for i in range(position - 1): current = current.next new_node.next = current.next current.next = new_node def remove(self, position): if position == 0: self.head = self.head.next else: current = self.head for i in range(position - 1): current = current.next current.next = current.next.next def traverse(self): current = self.head while current is not None: print(current.data) current = current.next

这是一个链表的实现，包括节点类 Node 和链表类 LinkedList。其中，节点类 Node 包含数据和指向下一个节点的指针，链表类 LinkedList 包含头节点和一些基本操作，如判断链表是否为空、添加节点、获取链表长度、在指定位置插入节点、删除指定位置的节点和遍历链表。