4.5 xml数据的修改与删除

1.修改节点的属性和内容

from xml.etree import ElementTree as ET
content = """
<data>
    <country name="Liechtenstein">
        <rank>2</rank>
        <year>2023</year>
        <gdppc>141100</gdppc>
        <neighbor direction="E" name="Austria" />
        <neighbor direction="W" name="Switzerland" />
    </country>
     <country name="Panama">
        <rank>69</rank>
        <year>2026</year>
        <gdppc>13600</gdppc>
        <neighbor direction="W" name="Costa Rica" />
        <neighbor direction="E" name="Colombia" />
    </country>
</data>
"""
root = ET.XML(content)
# 修改节点内容
year = root.find('country').find('year')
year.text = '2021'
# 测试一下是否修改成功
print(year.text)
# 修改节点属性
neibor1 = root.find('country').find('neighbor')
neibor1.set('name','China')
# 测试一下是否成功
print(neibor1.attrib)
# 保存修改
tree = ET.ElementTree(root)
tree.write("new.xml", encoding='utf-8')

2.删除节点

from xml.etree import ElementTree as ET
content = """
<data>
    <country name="Liechtenstein">
        <rank>2</rank>
        <year>2023</year>
        <gdppc>141100</gdppc>
        <neighbor direction="E" name="Austria" />
        <neighbor direction="W" name="Switzerland" />
    </country>
     <country name="Panama">
        <rank>69</rank>
        <year>2026</year>
        <gdppc>13600</gdppc>
        <neighbor direction="W" name="Costa Rica" />
        <neighbor direction="E" name="Colombia" />
    </country>
</data>
"""
root = ET.XML(content)
# 删除country第一个节点
root.remove(root.find('country'))
# 测试节点是否删除
print(root.find('country').attrib)
# 保存修改
tree = ET.ElementTree(root)
tree.write('new2.xml',encoding = 'utf-8')