如何向XML添加新节点

import xml.etree.ElementTree as ET

# 创建一个新的XML树
root = ET.Element("root")

# 向树中添加新节点
new_node = ET.SubElement(root, "new_node")

# 向新节点添加文本内容
new_node.text = "这是新节点的内容"

# 将树转换为字符串并打印
xml_string = ET.tostring(root, encoding="utf-8", method="xml")
print(xml_string.decode("utf-8"))