python parse xml

#!/usr/bin/python

import sys
from xml.dom import minidom

def findNode( in_parent, in_nodeName):
    """
    check wether the child node exist from paraent xml tree
    """
    if in_parent:
        for node in in_parent.childNodes:
            if node.nodeType == node.ELEMENT_NODE:
                if node.nodeName == in_nodeName:
                    return node

if __name__=="__main__":
    xml_fd   = minidom.parse('./b.xml')

    TargetBD = findNode(xml_fd, 'TargetBD')

    if(TargetBD == None):
       sys.exit(0)

    softwareReleaseVersion = TargetBD.getAttribute('softwareReleaseVersion')
    commandScriptName = TargetBD.getAttribute('commandScriptName')
    buildDescriptorId = TargetBD.getAttribute('buildDescriptorId')

    print softwareReleaseVersion
    print commandScriptName
    print buildDescriptorId

    buildElement = findNode(TargetBD, 'buildElement')
    if(buildElement == None):
       sys.exit(0)

    ElementCounts = TargetBD.getElementsByTagName("buildElement")
    for element in ElementCounts:
        softwareReleaseType = element.getAttribute('softwareReleaseType')
        softwareReleaseId = element.getAttribute('softwareReleaseId')
        softwareArchiveName = element.getAttribute('softwareArchiveName')
        print softwareReleaseType
        print softwareReleaseId
        print  softwareArchiveName
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xml

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