<root>
  <person>
    <name>John</name>
    <age>30</age>
  </person>
  <person>
    <name>Jane</name>
    <age>25</age>
  </person>
</root>

import xml.etree.ElementTree as ET

# 加载XML文件
tree = ET.parse('example.xml')
root = tree.getroot()

# 打印格式良好的XML文件
print(ET.tostring(root, encoding='utf-8', method='xml').decode())

<root>
  <person>
    <name>John</name>
    <age>30</age>
  </person>
  <person>
    <name>Jane</name>
    <age>25</age>
  </person>
</root>

import xml.etree.ElementTree as ET

# 加载XML文件
tree = ET.parse('example.xml')
root = tree.getroot()

# 修改XML文件
for person in root.findall('person'):
    age = person.find('age')
    age.text = str(int(age.text) + 1)

# 打印修改后的XML文件
print(ET.tostring(root, encoding='utf-8', method='xml').decode())

<root>
  <person>
    <name>John</name>
    <age>31</age>
  </person>
  <person>
    <name>Jane</name>
    <age>26</age>
  </person>
</root>

import xml.etree.ElementTree as ET

# 创建根元素
root = ET.Element('root')

# 创建子元素1
person1 = ET.SubElement(root, 'person')
name1 = ET.SubElement(person1, 'name')
name1.text = 'John'
age1 = ET.SubElement(person1, 'age')
age1.text = '30'

# 创建子元素2
person2 = ET.SubElement(root, 'person')
name2 = ET.SubElement(person2, 'name')
name2.text = 'Jane'
age2 = ET.SubElement(person2, 'age')
age2.text = '25'

# 创建XML文件
tree = ET.ElementTree(root)

# 打印XML文件
print(ET.tostring(root, encoding='utf-8', method='xml').decode())

<root>
  <person>
    <name>John</name>
    <age>30</age>
  </person>
  <person>
    <name>Jane</name>
    <age>25</age>
  </person>
</root>