XML Declaration standalone=“yes” lxml

Question

I have an xml I am parsing, making some changes and saving out to a new file. It has the declaration

Answer 1

If You want to disable outputting standalone at all pass None instead of True or False. Sounds logical but took some time to actually find and test it.

etree.tostring(tree, xml_declaration = True, encoding='utf-8', standalone=None)

or using context manager and stream etree.xmlfile serialization:

with etree.xmlfile(open('/tmp/test.xml'), encoding='utf-8') as xf:
    xf.write_declaration(standalone=None)
    with xf.element('html'):
        with xf.element('body'):
            element = etree.Element('p')
            element.text = 'This is paragraph'
            xf.write(element)