import xml.etree.ElementTree as ET

tree = ET.parse("xmltest.xml")

root = tree.getroot()

print(root.tag)

#遍历xml文档

for child in root:

    print(child.tag, child.attrib)

    for i in child:

        print(i.tag,i.text)

#只遍历year 节点

for node in root.iter('year'):

    print(node.tag,node.text)

#---------------------------------------

import xml.etree.ElementTree as ET

tree = ET.parse("xmltest.xml")

root = tree.getroot()

#修改

for node in root.iter('year'):

    new_year = int(node.text) + 1

    node.text = str(new_year)

    node.set("updated","yes")

tree.write("xmltest.xml")

#删除node

for country in root.findall('country'):

   rank = int(country.find('rank').text)

   if rank > 50:

     root.remove(country)

tree.write('output.xml')