如何生成没有标头的xml文件

import xml.etree.ElementTree as ET

# 创建根元素
root = ET.Element("root")

# 添加子元素
item1 = ET.SubElement(root, "item1")
item1.text = "value1"

item2 = ET.SubElement(root, "item2")
item2.text = "value2"

# 将XML写入文件
with open("output.xml", "wb") as f:
    f.write(ET.tostring(root, encoding="utf-8", method="xml"))

<root>
  <item1>value1</item1>
  <item2>value2</item2>
</root>

with open("output.xml", "wb") as f:
    f.write(b'<?xml version="1.0" encoding="utf-8"?>\n')
    f.write(ET.tostring(root, encoding="utf-8", method="xml"))