• python小白-day6 xml处理模块

    xml处理模块

    xml是实现不同语言或程序之间进行数据交换的协议，跟json差不多，但json使用起来更简单，不过，古时候，在json还没诞生的黑暗年代，大家只能选择用xml呀，至今很多传统公司如金融行业的很多系统的接口还主要是xml。

    xml的格式如下，就是通过<>节点来区别数据结构的:

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    <?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

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    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)


    修改文件内容

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    import xml.etree.ElementTree as ET
     
    tree = ET.parse("xmltest.xml")
    root = tree.getroot()
    print(root.tag)
    for node in root.iter('year'):
        new_year = int(node.text) + 1
        node.text = str(new_year)
        node.set("updated","yes")
     
    tree.write("xmltest_out.xml")

    ​

    删除文件内容：删除rank>50的country

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    import xml.etree.ElementTree as ET
     
    tree = ET.parse("xmltest.xml")
    root = tree.getroot()
    for country in root.findall('country'):
       rank = int(country.find('rank').text)
       if rank > 50:
         root.remove(country)
    tree.write('output.xml')


    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")
    age.text = '33'
    sex.text = 'male'
    name2 = ET.SubElement(new_xml,"name",attrib={"enrolled":"no"})
    age = ET.SubElement(name2,"age")
    sex = ET.SubElement(name2,"sex")
    age.text = '19'
    sex.text = 'fmale'
     
    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
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  • 原文地址：https://www.cnblogs.com/hetan/p/5211132.html
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