29949242

xml = """<Create> 
<SubNetwork networkType="GSM" userLabel="BSC">

</SubNetwork>
<SubNetwork networkType="WCDMA" userLabel="RNC01">

</SubNetwork>
<SubNetwork networkType="IPRAN" userLabel="IPRAN">

</SubNetwork>
<SubNetwork networkType="WCDMA" userLabel="RNC02">
                  <ManagedElement sourceType="CELLO">
                     <ManagedElementId string="3GALPAS" />
                     <primaryType type="RBS" />
                   .
                   .
                  </ManagedElement>
                  <ManagedElement sourceType="CELLO">
                     <ManagedElementId string="3GTUTI" />
                     <primaryType type="RBS" />
                   .
                   .
                  </ManagedElement>
                    <ManagedElement sourceType="CELLO">
                     <ManagedElementId string="3GHHH" />
                     <primaryType type="RBS" />
                   .
                   .
                  </ManagedElement>
</SubNetwork>
</Create>"""


import xml.etree.ElementTree as ET


identifiers = ["3GALPAS","3GTUTI"]

tree = ET.fromstring(xml)

for line in identifiers:
    line = line.rstrip()
    #get all subnet nodes containing certain ManagedElementId
    subnet_path = ".//ManagedElementId[@string='{0}']/../.."
    subnet_path = subnet_path.format(line)
    for subnet in tree.findall(subnet_path):
        #reconstruct subnet node:
        parent = ET.Element(subnet.tag, attrib=subnet.attrib)
        #xpath to find all ManagedElement containing certain ManagedElementId
        content_path = ".//ManagedElementId[@string='{0}']/..".format(line)
        #append all ManagedElement found to the new subnet:
        for content in subnet.findall(content_path):
            parent.append(content)
        #print new subnet:
        print ET.tostring(parent)