请给我一个完整的可以读写文件并且可交互的链表代码

以下是一个完整的可以读写文件并且可交互的链表代码：

class Node:
    def __init__(self, data=None):
        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
            return
        last_node = self.head
        while last_node.next:
            last_node = last_node.next
        last_node.next = new_node

    def display(self):
        current_node = self.head
        while current_node:
            print(current_node.data)
            current_node = current_node.next

    def read_from_file(self, filename):
        with open(filename, 'r') as f:
            for line in f:
                self.append(line.strip())

    def write_to_file(self, filename):
        with open(filename, 'w') as f:
            current_node = self.head
            while current_node:
                f.write(str(current_node.data) + '\n')
                current_node = current_node.next

if __name__ == '__main__':
    linked_list = LinkedList()
    linked_list.append(1)
    linked_list.append(2)
    linked_list.append(3)
    linked_list.display()

    linked_list.write_to_file('linked_list.txt')

    new_linked_list = LinkedList()
    new_linked_list.read_from_file('linked_list.txt')
    new_linked_list.display()

这个代码可以创建一个链表，可以将链表中的数据写入文件，也可以从文件中读取数据并创建一个新的链表。