4.3.4 全局地毯式“通缉”某一名称的数据

from xml.etree import ElementTree as ET
content = """
<data>
    <country name="Liechtenstein">
        <rank>2</rank>
        <year>2023</year>
        <gdppc>141100</gdppc>
        <neighbor direction="E" name="Austria" />
        <neighbor direction="W" name="Switzerland" />
    </country>
     <country name="Panama">
        <rank>69</rank>
        <year>2026</year>
        <gdppc>13600</gdppc>
        <neighbor direction="W" name="Costa Rica" />
        <neighbor direction="E" name="Colombia" />
    </country>
</data>
"""
root = ET.XML(content)
for child in root.iter('year'):
    print(child.tag, child.text)
# 输出：
# year 2023
# year 2026