xml数据结构处理

<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文件处理，循环遍历取值

import xml.etree.ElementTree as ET
tree = ET.parse('study_xml.xml') #使用parse方法解析这个xml文件
root = tree.getroot() #找到这个解析后的格式化内存地址
# print(root,root.tag)  #打印内存地址和标签，tag标签就是大标签
for child in root:  #循环取第二层标签内存地址
    print(child.tag,child.attrib) #打印标签和属性
    for i in child : #再循环第二层标签内存地址
        print(i.tag,i.text,i.attrib) #取标签，文本内容和属性(属性就是标签上面 又定义的键值对)

取特定键值对：

for node in root.iter('year'):
    print(node.tag,node.text)

修改和删除xml文档内容

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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')

删除

自己创建xml文档

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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