Question

I am trying to read a element form a xml file to add new elements.

The tag I’m trying to find contains xmlns.

It looks like this:

<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>

and my python code looks like this:

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

and at the following line:

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

and on the following line:

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

the following error occurs:

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

but when i remove the xmlns part from the tag, it works. does anybody know how i can solve this?

Answer 1

try using xml.etree.ElementTree.register_namespace(prefix, uri)

So

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

Then when you’re searching for elements, use the prefix before the element name

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