怎样才能有一个使用class的链表？

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

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

    def is_empty(self):
        return self.head is None

    def append(self, data):
        new_node = Node(data)
        if self.is_empty():
            self.head = new_node
        else:
            current = self.head
            while current.next:
                current = current.next
            current.next = new_node

    def prepend(self, data):
        new_node = Node(data)
        new_node.next = self.head
        self.head = new_node

    def delete(self, data):
        if self.is_empty():
            return
        if self.head.data == data:
            self.head = self.head.next
            return
        current = self.head
        while current.next:
            if current.next.data == data:
                current.next = current.next.next
                return
            current = current.next

    def search(self, data):
        current = self.head
        while current:
            if current.data == data:
                return True
            current = current.next
        return False

    def print_list(self):
        current = self.head
        while current:
            print(current.data, end=" ")
            current = current.next
        print()

linked_list = LinkedList()
linked_list.append(1)
linked_list.append(2)
linked_list.append(3)
linked_list.prepend(0)
linked_list.print_list()  # 输出：0 1 2 3
linked_list.delete(2)
linked_list.print_list()  # 输出：0 1 3
print(linked_list.search(1))  # 输出：True
print(linked_list.search(2))  # 输出：False