如何将BeautifulSoup对象作为XML文件保存到磁盘？

from bs4 import BeautifulSoup

# 解析XML文件
with open('example.xml', 'r') as file:
    soup = BeautifulSoup(file, 'xml')

# 或者创建一个空的BeautifulSoup对象
soup = BeautifulSoup(features='xml')

# 添加节点
new_tag = soup.new_tag('new_node')
new_tag.string = 'Hello World'
soup.root.append(new_tag)

# 修改节点
node = soup.find('node')
node.string = 'New Value'

# 删除节点
node = soup.find('node')
node.decompose()

with open('output.xml', 'w') as file:
    file.write(soup.prettify())