如何正确编写我的反转函数？

def reverse(data):
    # 判断输入数据类型
    if isinstance(data, str):
        return data[::-1]  # 字符串反转
    elif isinstance(data, list):
        return data[::-1]  # 数组反转
    elif isinstance(data, LinkedList):
        prev = None
        current = data.head
        while current:
            next_node = current.next
            current.next = prev
            prev = current
            current = next_node
        data.head = prev  # 链表反转
        return data
    else:
        return "Unsupported data type"

# 示例用法
print(reverse("Hello World"))  # 输出：dlroW olleH

array = [1, 2, 3, 4, 5]
print(reverse(array))  # 输出：[5, 4, 3, 2, 1]

linked_list = LinkedList()
linked_list.append(1)
linked_list.append(2)
linked_list.append(3)
print(reverse(linked_list))  # 输出：3 -> 2 -> 1