Python code for Adding tag in xml where parent tag is multiple with different attributes

Question

I'm parsing the following XML file using xml.etree.ElementTree:

<main>
    <stream id="1" name="some">
        <inner id="500">
              <sub-inner>
                 <inside> 500 </inside>
              <sub-inner>
        <inner>
    <stream id="2" name="some">
        <inner id="500">
              <sub-inner>
                 <inside> 500 </inside>
              <sub-inner>
        <inner>
    </stream>
</main>

How do I insert <outer>200</outer> element into the < sub-inner> tag where stream id ="2" one?

falsetru · Accepted Answer · 2013-11-25 14:18:51Z

2

import xml.etree.ElementTree as ET

root = ET.fromstring('''
<main>
    <stream id="1" name="some">
        <inner>500</inner>
    </stream>
    <stream id="2" name="some">
        <inner>500</inner>
    </stream>
</main>''')
stream = root.find('.//stream[@id="2"]')
outer = ET.SubElement(stream, 'outer')
outer.text = '200'
print(ET.tostring(root))

output:

<main>
    <stream id="1" name="some">
        <inner>500</inner>
    </stream>
    <stream id="2" name="some">
        <inner>500</inner>
    <outer>200</outer></stream>
</main>

If you want outer to come before the inner:

...
stream = root.find('.//stream[@id="2"]')
outer = ET.Element('outer')
outer.text = '200'
stream.insert(0, outer)
print(ET.tostring(root))

output:

<main>
    <stream id="1" name="some">
        <inner>500</inner>
    </stream>
    <stream id="2" name="some">
        <outer>200</outer><inner>500</inner>
    </stream>
</main>

edited Nov 25, 2013 at 14:18

answered Nov 25, 2013 at 13:54

falsetru

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