如何使用ElementTree解析包含多个相同字段和嵌套数据的XML字符串？

import xml.etree.ElementTree as ET

xml_string = """
<root>
    <data>
        <name>John</name>
        <age>25</age>
    </data>
    <data>
        <name>Jane</name>
        <age>30</age>
    </data>
</root>
"""

root = ET.fromstring(xml_string)

for data_elem in root.iter('data'):
    name_elem = data_elem.find('name')
    age_elem = data_elem.find('age')
    
    name = name_elem.text
    age = age_elem.text
    
    print(f"Name: {name}, Age: {age}")

for data_elem in root.iter('data'):
    # ...
    address_elem = data_elem.find('address')
    if address_elem is not None:
        city_elem = address_elem.find('city')
        state_elem = address_elem.find('state')
        
        city = city_elem.text
        state = state_elem.text
        
        print(f"City: {city}, State: {state}")