<?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>

import xml.etree.ElementTree as ET  

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

root = tree.getroot()

print(root.tag)

# 输出

# data                              

# 遍历xml文档

for child in root:

    print(child.tag,child.attrib)

# 输出

# country {'name': 'Liechtenstein'}

# country {'name': 'Singapore'}

# country {'name': 'Panama'}        

for node in root:

    for child in node:

        print(child.tag,child.text)

# 输出

# rank 2

# year 2008

# gdppc 141100

# neighbor None

# neighbor None                     

# rank 5

# year 2011

# gdppc 59900

# neighbor None                     

# rank 69

# year 2011

# gdppc 13600

# neighbor None

# neighbor None                     

# 只遍历year节点

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

    print(node.tag,node.text)       

# 输出

# year 2008

# year 2011

# year 2011                         

# 修改

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

    new_year = int(node.text) + 1

    node.text = str(new_year)

    node.set('update','yes')

tree.write('xmltest.xml')        

# 只遍历year节点

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

    print(node.tag,node.text)

# 输出

# year 2009

# year 2012

# year 2012

# 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')

import xml.etree.ElementTree as ET                            

new_xml = ET.Element('namelist')

name = ET.SubElement(new_xml,'name',attrib={'enrolld': 'yes'})

age = ET.SubElement(name,'age',attrib={'checed': 'no'})

sex = ET.SubElement(name,'sex')

sex.text = '男'                                                

name2 = ET.SubElement(new_xml,'name',attrib={'enrolld': 'no'})

age = ET.SubElement(name2,'age')

age.text = ''                                               

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) #打印生成格式