如何提取 xml 文件的一部分

Question

我有一个很大的 xml 文件，如下所示。基本上我想提取 xml 文件的一部分，例如这个 "<ManagedElementId string = "rbs064841"/>"。

 <Model version = "1" importVersion = "12.2">
        <Create>
            <SubNetwork networkType = "WRAN" userLabel="AHPTUR14">
                <ManagedElement sourceType = "CELLO">
                    <ManagedElementId string = "rbs064841"/>
                    <primaryType type = "RBS"/>
                    <managedElementType types = ""/>
                    <associatedSite string = "Site=site06484"/>
                    <nodeVersion string = "W12B"/>
                    <platformVersion string = "Cello 12.2"/>
                    <swVersion string = ""/>
                    <vendorName string = "ERICSSON"/>
                    <userDefinedState string = ""/>
                    <managedServiceAvailability int = "1"/>
                    <isManaged boolean = "true"/>
                    <neMIMVersion string = "vS.1.150"/>
                    <connectionStatus string = "ON"/>
                </ManagedElement>
            </SubNetwork>
             <SubNetwork networkType = "WRAN" userLabel = "AHPT78">
                <ManagedElement sourceType = "CELLO">
                    <ManagedElementId string = "rbs04798"/>
                    <primaryType type = "RBS"/>
                    <managedElementType types = ""/>
                    <associatedSite string = "Site=site06484"/>
                    <nodeVersion string = "W12B"/>
                    <platformVersion string = "Cello 12.2"/>
                    <swVersion string = ""/>
                    <vendorName string = "ERICSSON"/>
                    <userDefinedState string = ""/>
                    <managedServiceAvailability int = "1"/>
                    <isManaged boolean = "true"/>
                    <neMIMVersion string = "vS.1.150"/>
                    <connectionStatus string = "ON"/>
                </ManagedElement>
            </SubNetwork>
            <SubNetwork networkType = "WRAN" userLabel = "AHPT4">
                <ManagedElement sourceType = "CELLO">
                    <ManagedElementId string = "rbs04456"/>
                    <primaryType type = "RBS"/>
                    <managedElementType types = ""/>
                    <associatedSite string = "Site=site06484"/>
                    <nodeVersion string = "W12B"/>
                    <platformVersion string = "Cello 12.2"/>
                    <swVersion string = ""/>
                    <vendorName string = "ERICSSON"/>
                    <userDefinedState string = ""/>
                    <managedServiceAvailability int = "1"/>
                    <isManaged boolean = "true"/>
                    <neMIMVersion string = "vS.1.150"/>
                    <connectionStatus string = "ON"/>
                </ManagedElement>
            </SubNetwork>
        </Create>
    </Model>

这意味着在解析之后我想提取这部分：

<SubNetwork networkType = "WRAN" userLabel="AHPTUR14">
            <ManagedElement sourceType = "CELLO">
                <ManagedElementId string = "rbs064841"/>
                <primaryType type = "RBS"/>
                <managedElementType types = ""/>
                <associatedSite string = "Site=site06484"/>
                <nodeVersion string = "W12B"/>
                <platformVersion string = "Cello 12.2"/>
                <swVersion string = ""/>
                <vendorName string = "ERICSSON"/>
                <userDefinedState string = ""/>
                <managedServiceAvailability int = "1"/>
                <isManaged boolean = "true"/>
                <neMIMVersion string = "vS.1.150"/>
                <connectionStatus string = "ON"/>
            </ManagedElement>
        </SubNetwork>

所以通过 ManagedElementId 在大 xml 文件中搜索，当找到时提取它所在的部分，意思是从 <SubNetwork> 到 </SubNetwork> . 我知道如何从 xml 文件中提取数据，但我不知道如何提取 xml.file 的一部分。我正在使用 python ElementTree。任何建议都会有所帮助。

Answer 1

使用find和path，然后得到相对父节点，像这样：

s = '''<Model version = "1" importVersion = "12.2">
        <Create>
            <SubNetwork networkType = "WRAN" userLabel="AHPTUR14">
                <ManagedElement sourceType = "CELLO">
                    <ManagedElementId string = "rbs064841"/>
                    <primaryType type = "RBS"/>
                    <managedElementType types = ""/>
                    <associatedSite string = "Site=site06484"/>
                    <nodeVersion string = "W12B"/>
                    <platformVersion string = "Cello 12.2"/>
                    <swVersion string = ""/>
                    <vendorName string = "ERICSSON"/>
                    <userDefinedState string = ""/>
                    <managedServiceAvailability int = "1"/>
                    <isManaged boolean = "true"/>
                    <neMIMVersion string = "vS.1.150"/>
                    <connectionStatus string = "ON"/>
                </ManagedElement>
            </SubNetwork>
             <SubNetwork networkType = "WRAN" userLabel = "AHPT78">
                <ManagedElement sourceType = "CELLO">
                    <ManagedElementId string = "rbs04798"/>
                    <primaryType type = "RBS"/>
                    <managedElementType types = ""/>
                    <associatedSite string = "Site=site06484"/>
                    <nodeVersion string = "W12B"/>
                    <platformVersion string = "Cello 12.2"/>
                    <swVersion string = ""/>
                    <vendorName string = "ERICSSON"/>
                    <userDefinedState string = ""/>
                    <managedServiceAvailability int = "1"/>
                    <isManaged boolean = "true"/>
                    <neMIMVersion string = "vS.1.150"/>
                    <connectionStatus string = "ON"/>
                </ManagedElement>
            </SubNetwork>
            <SubNetwork networkType = "WRAN" userLabel = "AHPT4">
                <ManagedElement sourceType = "CELLO">
                    <ManagedElementId string = "rbs04456"/>
                    <primaryType type = "RBS"/>
                    <managedElementType types = ""/>
                    <associatedSite string = "Site=site06484"/>
                    <nodeVersion string = "W12B"/>
                    <platformVersion string = "Cello 12.2"/>
                    <swVersion string = ""/>
                    <vendorName string = "ERICSSON"/>
                    <userDefinedState string = ""/>
                    <managedServiceAvailability int = "1"/>
                    <isManaged boolean = "true"/>
                    <neMIMVersion string = "vS.1.150"/>
                    <connectionStatus string = "ON"/>
                </ManagedElement>
            </SubNetwork>
        </Create>
    </Model>'''

# I'd prefer lxml, but you need to work on xml module...
import xml.etree.ElementTree as ET
tree = ET.fromstring(s)

# since the SubNetwork node you're interested is the parent of parent of ManagedElementId
node = tree.find('.//ManagedElementId[@string="rbs064841"]/../../../')

print ET.tostring(node)
<SubNetwork networkType="WRAN" userLabel="AHPTUR14">
                <ManagedElement sourceType="CELLO">
                    <ManagedElementId string="rbs064841"/>
                    <primaryType type="RBS"/>
                    <managedElementType types=""/>
                    <associatedSite string="Site=site06484"/>
                    <nodeVersion string="W12B"/>
                    <platformVersion string="Cello 12.2"/>
                    <swVersion string=""/>
                    <vendorName string="ERICSSON"/>
                    <userDefinedState string=""/>
                    <managedServiceAvailability int="1"/>
                    <isManaged boolean="true"/>
                    <neMIMVersion string="vS.1.150"/>
                    <connectionStatus string="ON"/>
                </ManagedElement>
            </SubNetwork>

如果您从文件中解析，请使用 getroot():

root = ET.parse('file.xml')
tree = root.getroot()
...

希望对您有所帮助。

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