如何使用python获取XML的所有子节点?

This is my XML file

这是我的XML文件

<?xml version="1.0"?>
<data>
    <country name="Liechtenstein">
        <rank>1</rank>
        <year>2008</year>
        <gdp>141100</gdp>
        <neighbor name="Austria" direction="E"/>
        <neighbor name="Switzerland" direction="W"/>
    </country>
</data>
<?xml version