xml 模块

xml 示例代码：

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<?xml version='1.0' encoding='utf-8'?>
<namelist>
    <name enrolled="yes">alex
        <age checked="no">33</age>
        <sex />
    </name>
    <name enrolled="yes">wpx
        <age checked="no">55</age>
        <sex />
    </name>
    <name enrolled="yes">chen
        <age checked="no">66</age>
        <sex />
    </name>
</namelist>

遍历 xml 树：

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import xml.etree.ElementTree as ET
tree= ET.parse("xml")
root = tree.getroot()
print(root)  
#<Element 'namelist' at 0x0000020AEB4ECE58>
for child in root:
	print(child.tag,child.attrib)  
#name {'enrolled': 'yes'}
#name {'enrolled': 'yes'}
#name {'enrolled': 'yes'}
for child in root:
	print(child.tag,child.attrib)  
	for i in child:
	print(i.tag,i.text)
#name {'enrolled': 'yes'}
#age 33
#sex None
#name {'enrolled': 'yes'}
#age 55
#sex None
#name {'enrolled': 'yes'}
#age 66
#sex None

修改 xml 文本内容，属性内容

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for node in  root.iter('age'):  #改文本内容
    new_age = int(node.text)+1
    node.text= str(new_age)
    node.set("title",'yes')     #改属性值
tree.write('xmltest.xml')

修改后 xmltest.xml 文件代码如下:

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<namelist>
    <name enrolled="yes">alex
        <age checked="no" title="yes">34</age>
        <sex />
    </name>
    <name enrolled="yes">wpx
        <age checked="no" title="yes">56</age>
        <sex />
    </name>
    <name enrolled="yes">chen
        <age checked="no" title="yes">67</age>
        <sex />
    </name>
</namelist>

删除满足条件的 xml 数据

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for name in root.findall('age'):
    age = int(name.find('age').text)
    if age > 50 :
        root.remove()
tree.write('xml_test.xml')

新建 xml 树

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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'

et = ET.ElementTree(new_xml)
et.write("test.xml",encoding="utf-8",xml_declaration=True)
ET.dump(new_xml)

生成的 xml 文件代码如下

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<?xml version='1.0' encoding='utf-8'?>
<namelist>
    <name enrolled="yes">
    <age checked="no">33</age>
    <sex />
    </name>
</namelist>