链表-查找链表最后节点函数pta

根据提供的引用内容，以下是一个查找链表最后节点的函数的示例代码：

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

def find_last_node(head):
    if head is None:
        return None
    
    current = head
    while current.next is not None:
        current = current.next
    
    return current

# 示例链表
head = Node(1)
node2 = Node(2)
node3 = Node(3)
head.next = node2
node2.next = node3

last_node = find_last_node(head)
print("The value of the last node is:", last_node.value)  # 输出：The value of the last node is: 3

该函数通过遍历链表，直到找到最后一个节点，并返回该节点的值。如果链表为空，则返回None。