Question

对于以下sample.xml文件，如何使用Python单独替换arg键“Type A”和“Type B”的值？

sample.xml中：

        <sample>
            <Adapter type="abcdef">
                <arg key="Type A" value="true" />
                <arg key="Type B" value="true" />
            </Adapter>
        </sample>

这就是我在Python中使用arg属性的方法：

tree = ET.parse('sample.xml')
for node in tree.iterfind('.//logging/Adapter[@type="abcdef"]'):
    for child in node:
        child.set('value', 'false') #This change both values to "false"

Answer 1

您可以查看＆＃34;键＆＃34; ==＆＃39; A＆＃39; /＆＃39; B＆＃39;使用 get 方法，如下所示：

for node in tree.iterfind('.//logging/Adapter[@type="abcdef"]'):
    for child in node:
        # check if the key is 'Type A'
        if child.get('key') == 'Type A':
            child.set('value', 'false')
        # ... if 'Type B' ...

事实上，您可以通过直接使用更好的xpath访问来改进代码：

for node in tree.iterfind('.//logging/Adapter[@type="abcdef"]/arg'):
    # so you don't need another inner loop to access <arg> elements
    if node.get('key') == 'Type A':
        node.set('value', 'false')
    # ... if 'Type B' ...

Answer 2

使用lxml.etree解析HTML内容，使用xpath方法获取arg属性值为key

Type A

代码：

from lxml import etree
root = etree.fromstring(content)
for i in root.xpath('//Adapter[@type="abcdef"]/arg[@key="Type A"]'):
    i.attrib["value"] = "false"

print etree.tostring(root)

输出：

python test.py 
<sample>
    <Adapter type="abcdef">
        <arg key="Type A" value="false"/>
        <arg key="Type B" value="true"/>
    </Adapter>
</sample>

XML <arg>值替换Python </arg>

2 个答案: