仅显示链表的最后一个元素

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

class LinkedList:
    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:
                current = current.next
            current.next = new_node

    def get_last_element(self):
        if self.head is None:
            return None
        current = self.head
        while current.next:
            current = current.next
        return current.data

# 创建一个链表对象
linked_list = LinkedList()

# 向链表中添加元素
linked_list.append(1)
linked_list.append(2)
linked_list.append(3)

# 获取链表的最后一个元素
last_element = linked_list.get_last_element()
print(last_element)  # 输出：3