附加父節點至xm

Question

我想在xml文件中再添加一个块。基本上，在父级Tss下，我想用它的属性创建子单元Entry。下面是我要添加到xml文件的内容：

         <Entry>
            <System string = "rbs005019"/>
            <Type string = "SECURE"/>
            <User string = "rbs"/>
            <Password string = "rbs005019"/>
        </Entry>

这是xml文件

   <ManagedElement sourceType = "CELLO">
        <ManagedElementId string = "rbs005019"/>
        <Tss>
            <Entry>
                <System string = "rbs005019"/>
                <Type string = "NORMAL"/>
                <User string = "rbs"/>
                <Password string = "rbs005019"/>
            </Entry>
        </Tss>
    </ManagedElement>

所以梳理之后应该是这样的：

  <ManagedElement sourceType = "CELLO">
        <ManagedElementId string = "rbs005019"/>
        <Tss>
            <Entry>
                <System string = "rbs005019"/>
                <Type string = "NORMAL"/>
                <User string = "rbs"/>
                <Password string = "rbs005019"/>
            </Entry>
            <Entry>
                <System string = "rbs005019"/>
                <Type string = "SECURE"/>
                <User string = "rbs"/>
                <Password string = "rbs005019"/>
            </Entry>
        </Tss>
        </ManagedElement>

我使用的是python2.6和lxml.etree。你知道吗

Answer 1

lxml有一个函数parentElem.insert(position, new_element)，允许您在其父元素下插入一个新的子元素。您可以找到一个例子here和here（Section元素是list）

Answer 2

下面是使用insert的示例：

In [31]: %cpaste
Pasting code; enter ' ' alone on the line to stop or use Ctrl-D.
:current = """ <ManagedElement sourceType = "CELLO">
:        <ManagedElementId string = "rbs005019"/>
:        <Tss>
:            <Entry>
:                <System string = "rbs005019"/>
:                <Type string = "NORMAL"/>
:                <User string = "rbs"/>
:                <Password string = "rbs005019"/>
:            </Entry>
:        </Tss>
:    </ManagedElement>
:"""
:<EOF>

In [32]: current = etree.fromstring(current)

In [33]: %cpaste
Pasting code; enter ' ' alone on the line to stop or use Ctrl-D.
:want = """
: <Entry>
:            <System string = "rbs005019"/>
:            <Type string = "SECURE"/>
:            <User string = "rbs"/>
:            <Password string = "rbs005019"/>
:        </Entry>
:"""
:<EOF>

In [34]: want = etree.fromstring(want)

In [35]: current.find('./Tss').insert(0,want)

In [36]: print etree.tostring(current, pretty_print=True)
<ManagedElement sourceType="CELLO">
        <ManagedElementId string="rbs005019"/>
        <Tss>
            <Entry>
            <System string="rbs005019"/>
            <Type string="SECURE"/>
            <User string="rbs"/>
            <Password string="rbs005019"/>
        </Entry>
        <Entry>
            <System string="rbs005019"/>
            <Type string="NORMAL"/>
            <User string="rbs"/>
            <Password string="rbs005019"/>
        </Entry>
       </Tss>
    </ManagedElement>

插入发生在以下行： current.find('./Tss').insert(0,want)