How to remove elements from XML using Python

Using lxml:

import lxml.etree as le

with open('doc.xml','r') as f:
    doc=le.parse(f)
    for elem in doc.xpath('//*[attribute::lang]'):
        if elem.attrib['lang']=='en':
            elem.attrib.pop('lang')
        else:
            parent=elem.getparent()
            parent.remove(elem)
    print(le.tostring(doc))

yields

<root>
    <elm>Common content</elm>

    <elm>
        <elm>Content EN</elm>
        </elm>

    <elm>Common content</elm>

    <elm>Content EN</elm>
    <elm>
        <elm>Content EN</elm>
        <elm>Content EN</elm>
    </elm>

    </root>

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