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  • Python3 xml模块的增删改查

    xml数据示例

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    <data>
        <country name="Liechtenstein">
            <rank updated="yes">2</rank>
            <year updated_by="Alex">2009</year>
            <gdppc>141100</gdppc>
            <neighbor direction="E" name="Austria" />
            <neighbor direction="W" name="Switzerland" />
        </country>
        <country name="Singapore">
            <rank updated="yes">5</rank>
            <year updated_by="Alex">2012</year>
            <gdppc>59900</gdppc>
            <neighbor direction="N" name="Malaysia" />
        </country>
        <country name="Panama">
            <rank updated="yes">69</rank>
            <year updated_by="Alex">2012</year>
            <gdppc>13600</gdppc>
            <neighbor direction="W" name="Costa Rica" />
            <neighbor direction="E" name="Colombia" />
            <info>
                <population>8</population>
                <size>960</size>
            </info>
        </country>
    </data>

    xml数据处理

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    import xml.etree.ElementTree as ET
     
    '''xml 数据的处理 '''
    tree = ET.parse("xmltest.xml")
    root = tree.getroot() #数据内存地址
    print(root.tag)  #标签
     
    '''遍历所有数据'''
    for i in root:
        print(i.tag,i.attrib)  #attrib 获取属性名
        for k in i:
            print(k.tag,k.attrib,k.text) #text 文本内容
     
    ''' 遍历某一个标签的值 '''
    for ta in root.iter("year"):
        print(ta.tag,ta.attrib,ta.text)

    XML数据的创建

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    '''xml 数据的创建 '''
    new_xml = ET.Element("personinfolist") #Element 根节点
    personinfo = ET.SubElement(new_xml, "personinfo", attrib={"enrolled": "yes"})
    name = ET.SubElement(personinfo, "name")  #SubElement 子节点
    name.text = "Alex Li"
    age = ET.SubElement(personinfo, "age", attrib={"checked": "no"})
    sex = ET.SubElement(personinfo, "sex")
    age.text = '56'
    personinfo2 = ET.SubElement(new_xml, "personinfo", attrib={"enrolled": "no"})
    name = ET.SubElement(personinfo2, "name")
    name.text = "Oldboy Ran"
    age = ET.SubElement(personinfo2, "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)
    """ xml_declaration 声明xml文件类型 """
    ET.dump(new_xml)  # 打印生成的格式

    XML数据的修改

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    '''xml 数据的修改 '''
    for node in root.iter('year'):
        new_year = int(node.text) + 1
        node.text = str(new_year)
        node.set("updated_by", "Alex")
    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')
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  • 原文地址：https://www.cnblogs.com/bert227/p/9323404.html
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