xml模块

<?xml version="1.0"?>
<data>
    <country name="Liechtenstein">
        <rank updated="yes">2</rank>
        <year>2008</year>
        <gdppc>141100</gdppc>
        <neighbor name="Austria" direction="E"/>
        <neighbor name="Switzerland" direction="W"/>
    </country>
    <country name="Singapore">
        <rank updated="yes">5</rank>
        <year>2011</year>
        <gdppc>59900</gdppc>
        <neighbor name="Malaysia" direction="N"/>
    </country>
    <country name="Panama">
        <rank updated="yes">69</rank>
        <year>2011</year>
        <gdppc>13600</gdppc>
        <neighbor name="Costa Rica" direction="W"/>
        <neighbor name="Colombia" direction="E"/>
    </country>
</data>


xml协议在各个语言里的都 是支持的，在python中可以用以下模块操作xml：
# print(root.iter('year')) #全文搜索
# print(root.find('country')) #在root的子节点找，只找一个
# print(root.findall('country')) #在root的子节点找，找所有

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,child.attrib['name'])
        for i in child:
            print(i.tag,i.attrib,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')
        node.set('version','1.0')
    tree.write('test.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')

#在country内添加（append）节点year2
    import xml.etree.ElementTree as ET
    tree = ET.parse("a.xml")
    root=tree.getroot()
    for country in root.findall('country'):
        for year in country.findall('year'):
            if int(year.text) > 2000:
                year2=ET.Element('year2')
                year2.text='新年'
                year2.attrib={'update':'yes'}
                country.append(year2) #往country节点下添加子节点

    tree.write('a.xml.swap')



自己创建xml文档：
    import xml.etree.ElementTree as ET

    new_xml = ET.Element("namelist")
    name = ET.SubElement(new_xml,"name",attrib={"enrolled":"yes"})
    age = ET.SubElement(name,"age",attrib={"checked":"no"})
    sex = ET.SubElement(name,"sex")
    sex.text = '33'
    name2 = ET.SubElement(new_xml,"name",attrib={"enrolled":"no"})
    age = ET.SubElement(name2,"age")
    age.text = '19'

    et = ET.ElementTree(new_xml) #生成文档对象
    et.write("test.xml", encoding="utf-8",xml_declaration=True)

    ET.dump(new_xml) #打印生成的格式