实现单链表按索引值删除节点

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

class LinkedList:
    def __init__(self):
        self.head = None

    def add_node(self, data):
        new_node = Node(data)
        if self.head is None:
            self.head = new_node
        else:
            current = self.head
            while current.next:
                current = current.next
            current.next = new_node

    def delete_node_by_index(self, index):
        if self.head is None:
            return
        if index == 0:
            self.head = self.head.next
            return
        current = self.head
        prev = None
        count = 0
        while current and count != index:
            prev = current
            current = current.next
            count += 1
        if current is None:
            return
        prev.next = current.next

# 创建链表对象
linked_list = LinkedList()

# 添加节点
linked_list.add_node(1)
linked_list.add_node(2)
linked_list.add_node(3)
linked_list.add_node(4)
linked_list.add_node(5)

# 删除索引为2的节点
linked_list.delete_node_by_index(2)