那么，您需要找到<parent>，然后找到<child>，将属性从<parent>复制到<child>，将<child>附加到根节点并删除<parent>。

import xml.etree.ElementTree as ET

xml = '''<root>
    <parent attr1="foo" attr2="bar">
        <child> something </child>
    </parent>
</root>'''

root = ET.fromstring(xml)
parent = root.find("parent")
child = parent.find("child")
child.attrib = parent.attrib
root.append(child)
root.remove(parent)
# next code is just to print patched XML
ET.indent(root)
ET.dump(root)

结果：

<root>
  <child attr1="foo" attr2="bar"> something </child>
</root>