4

我正在尝试从 xml 文件中读取元素以添加新元素。

我试图找到的标签包含 xmlns。

它看起来像这样：

<labcore.logging.service defaultSystemIdentificationCode="??" xmlns="http://schemas.com/labcore/configuration">
<storage databaseName="COMIT" storageType="Oracle" />
<logEventDefinitions>

            <logEventDefinition assembly="IM.LogEventDefinitions" />                    
            <logEventDefinition assembly="BarcodeEntry.LogEventDefinitions" />                  
            <logEventDefinition assembly="MaintenanceScheduling.ActivityLog.Messages.LogEventDefinitions" />
            <logEventDefinition assembly="InCore.LogEventDefinitions" />    


  <logEventDefinition assembly="LogEventPackage.LogEventDefinitions" />
</logEventDefinitions>

我的python代码如下所示：

import xml.etree.ElementTree as xml

def modifyComitLoggingConfigFile(filePath, fileName):

    path = filePath+"\\"+fileName

    IM = xml.Element("logEventDefinition")
    IM.attrib["assembly"] = "IM.LogEventDefinitions"

    BarcodeEntry = xml.Element("logEventDefinition")
    BarcodeEntry.attrib["assembly"] = "BarcodeEntry.LogEventDefinitions"

    MaintenanceScheduling = xml.Element("logEventDefinition")
    MaintenanceScheduling.attrib["assembly"] = "MaintenanceScheduling.ActivityLog.Messages.LogEventDefinitions"

    RTCosmo3 = xml.Element("logEventDefinition")
    RTCosmo3.attrib["assembly"] = "InCore.LogEventDefinitions"

    tree = xml.parse(path)
    rootElement = tree.getroot()

    loggingTag = rootElement.find("labcore.logging.service")
    print "loggingTag"
    print loggingTag
    print

    logEventDefinitionsTag = loggingTag.find("logEventDefinitions")
    print "logEventDefinitionsTag"
    print logEventDefinitionsTag
    print

    logEventDefinitionsTag.insert(0, RTCosmo3)
    logEventDefinitionsTag.insert(0, MaintenanceScheduling)
    logEventDefinitionsTag.insert(0, BarcodeEntry)        
    logEventDefinitionsTag.insert(0, IM)

    print "definitionfilesTag"
    print logEventDefinitionsTag
    print

    print "xml.tostring of definitionfilesTag"
    print xml.tostringlist(logEventDefinitionsTag)
    print

    tree.write(path+"1")
    return

并在以下行：

import xml.etree.ElementTree as xml

def modifyComitLoggingConfigFile(filePath, fileName):

    path = filePath+"\\"+fileName

    IM = xml.Element("logEventDefinition")
    IM.attrib["assembly"] = "IM.LogEventDefinitions"

    BarcodeEntry = xml.Element("logEventDefinition")
    BarcodeEntry.attrib["assembly"] = "BarcodeEntry.LogEventDefinitions"

    MaintenanceScheduling = xml.Element("logEventDefinition")
    MaintenanceScheduling.attrib["assembly"] = "MaintenanceScheduling.ActivityLog.Messages.LogEventDefinitions"

    RTCosmo3 = xml.Element("logEventDefinition")
    RTCosmo3.attrib["assembly"] = "InCore.LogEventDefinitions"

    tree = xml.parse(path)
    rootElement = tree.getroot()

    loggingTag = rootElement.find("labcore.logging.service")
    print "loggingTag"
    print loggingTag
    print

    logEventDefinitionsTag = loggingTag.find("logEventDefinitions")
    print "logEventDefinitionsTag"
    print logEventDefinitionsTag
    print

    logEventDefinitionsTag.insert(0, RTCosmo3)
    logEventDefinitionsTag.insert(0, MaintenanceScheduling)
    logEventDefinitionsTag.insert(0, BarcodeEntry)        
    logEventDefinitionsTag.insert(0, IM)

    print "definitionfilesTag"
    print logEventDefinitionsTag
    print

    print "xml.tostring of definitionfilesTag"
    print xml.tostringlist(logEventDefinitionsTag)
    print

    tree.write(path+"1")
    return

并在以下行：

loggingTag = rootElement.find("labcore.logging.service")

出现以下错误：

AttributeError: 'NoneType' object has no attribute 'find'

但是当我xmlns从标签中删除部分时，它可以工作。有人知道我怎么解决这个问题吗？

4

2 回答 2

3

尝试使用xml.etree.ElementTree.register_namespace(prefix, uri)

所以

xml.etree.ElementTree.register_namespace("lc", "http://schemas.com/labcore/configuration")

然后在搜索元素时，在元素名称前使用前缀

loggingTag = rootElement.find("lc:labcore.logging.service")
于 2012-04-26T17:17:56.933 回答
1

正如我的评论，这是一种有效的解决方案。但我现在不确定，如果该服务仍然有效，也许我可以在今天或星期一测试它。

解决方案是：将命名空间添加到变量：

namespace = "{http://schemas.com/labcore/configuration}"

然后当您调用 find.. 在搜索标记之前添加 {0} 并对其进行格式化。

loggingTag = rootElement.find("{0}labcore.logging.service".format(namespace))

你必须为所有孩子添加这个。

我不确定该服务是否会在此之后工作，因为他为每个标签添加了一个 ns:tagname。但我认为它会工作。

根元素现在是：

<configuration xmlns:ns0="http://schemas.com/labcore/configuration">

孩子们现在是：

<ns0:labcore.logging.service defaultSystemIdentificationCode="??">

如果它有效或无效，将给出反馈。但希望它会:)

于 2012-04-27T05:58:42.850 回答