找出以下xml字符串中跟在标签名为id的、文本内容为102的标签后面的标签名为Audio的标签的子标签的xpath:'''<?xml version="1.0" encoding="UTF-8"?><StreamingChannelList xmlns="http://www.hikvision.com/ver20/XMLSchema"><StreamingChannel xmlns="http://www.hikvision.com/ver20/XMLSchema"><id>101</id><channelName>Camera 01</channelName><enabled>true</enabled></StreamingChannel><StreamingChannel xmlns="http://www.hikvision.com/ver20/XMLSchema"><id>102</id><channelName>Camera 01</channelName><enabled>true</enabled><Video><enabled>true</enabled></Video><Audio><enabled>false</enabled><audioInputChannelID>1</audioInputChannelID><audioCompressionType>MP2L2</audioCompressionType></Audio></StreamingChannel></StreamingChannelList>'''
时间: 2023-08-17 08:06:44 浏览: 161
你可以使用之前提到的 `xml.etree.ElementTree` 模块来解析XML字符串,并通过递归遍历XML树来查找满足条件的标签。以下是一段实现该功能的示例代码:
```python
import xml.etree.ElementTree as ET
def find_next_audio_xpath(xml_str, tag_name, text):
root = ET.fromstring(xml_str)
namespaces = {'ns': 'http://www.hikvision.com/ver20/XMLSchema'}
def traverse(node, found):
if found:
return True
for child in node:
if child.tag == tag_name and child.text == text:
found = True
elif found and child.tag == 'Audio':
for subchild in child:
print(ET.ElementTree(root).getpath(subchild))
return True
found = traverse(child, found)
return found
traverse(root, False)
# 示例用法
xml_string = '''<?xml version="1.0" encoding="UTF-8"?>
<StreamingChannelList xmlns="http://www.hikvision.com/ver20/XMLSchema">
<StreamingChannel xmlns="http://www.hikvision.com/ver20/XMLSchema">
<id>101</id>
<channelName>Camera 01</channelName>
<enabled>true</enabled>
</StreamingChannel>
<StreamingChannel xmlns="http://www.hikvision.com/ver20/XMLSchema">
<id>102</id>
<channelName>Camera 01</channelName>
<enabled>true</enabled>
<Video>
<enabled>true</enabled>
</Video>
<Audio>
<enabled>false</enabled>
<audioInputChannelID>1</audioInputChannelID>
<audioCompressionType>MP2L2</audioCompressionType>
</Audio>
</StreamingChannel>
</StreamingChannelList>'''
find_next_audio_xpath(xml_string, 'id', '102')
```
在上述示例中,`find_next_audio_xpath`函数接受三个参数:`xml_str`表示输入的XML字符串,`tag_name`表示目标标签名,`text`表示目标标签的文本内容。函数首先将XML字符串解析为一个元素树,并通过递归遍历树来查找满足条件的标签。当找到目标标签后,会继续遍历其后面的标签,如果遇到了标签名为'Audio'的标签,则会输出其子标签的XPath路径。
在示例中,输入的XML字符串是一个包含了两个 `<StreamingChannel>` 标签的例子。函数将找到一个满足条件的标签(id为102),并输出其后面的标签名为'Audio'的子标签的XPath路径。你可以根据实际需求修改代码,例如将匹配到的XPath路径存储到一个列表中返回。
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