from xml.etree import ElementTree as ET from xml.dom import minidom def MyXMLWrite(root, path): rough_string = ET.tostring(root, encoding='utf-8') reparsed = minidom.parseString(rough_string) new_string = reparsed.toprettyxml(indent=" ") f = open(path, 'w', encoding='utf-8') f.write(new_string) f.close() ET.register_namespace('h', "http://www.w3.org/TR/htm14") root = ET.Element("{http://www.w3.org/TR/htm14}STUFF") body = ET.SubElement(root, "{http://www.w3.org/TR/htm14}MORE_STUFF", attrib={"{http://www.w3.org/TR/htm14}www": "abc"}) body.text = "STUFF EVERYWHERE" MyXMLWrite(root, 'piaoliang.xml')