如何用xml.etree.ElementTree把超文本标记语言写成XML文件？

import xml.etree.ElementTree as ET

# 创建根元素
root = ET.Element("html")

# 创建head元素
head = ET.SubElement(root, "head")

# 创建title元素
title = ET.SubElement(head, "title")
title.text = "Hello World"

# 创建body元素
body = ET.SubElement(root, "body")

# 创建p元素
p = ET.SubElement(body, "p")
p.text = "This is a paragraph."

# 创建a元素
a = ET.SubElement(p, "a")
a.text = "Click here"
a.set("href", "https://www.example.com")

# 创建XML树
tree = ET.ElementTree(root)

# 将XML树写入文件
tree.write("output.xml", encoding="utf-8", xml_declaration=True)