Write xml file using lxml library in Python

You can get a string from the element and then write that from lxml tutorial

str = etree.tostring(root, pretty_print=True)

Look at the tostring documentation to set the encoding - this was written in Python 2, Python 3 gives a binary string back which can be written directly to file but is probably not what you want in code.

or convert to an element tree (originally write to a file handle but either missed when I wrote this or it is new it can be a file name as per this answer )

et = etree.ElementTree(root)et.write('output.xml', pretty_print=True)

You can try the below code.

from lxml import etree as ETroot = ET.Element('Doc')level1 = ET.SubElement(root, 'S')main = ET.SubElement(level1, 'Text')main.text = 'Thanks for contributing an answer to Stack Overflow!'second = ET.SubElement(level1, 'Tokens')level2 = ET.SubElement(second, 'Token', word=u"low")level3 = ET.SubElement(level2, 'Morph')second1 = ET.SubElement(level3, 'Lemma')second1.text = 'sdfs'second1 = ET.SubElement(level3, 'info')second1.text = 'qw'level4 = ET.SubElement(level3, 'Aff')second1 = ET.SubElement(level4, 'Type')second1.text = 'sdfs'second1 = ET.SubElement(level4, 'Suf')second1.text = 'qw'tree = ET.ElementTree(root)tree.write('output.xml', pretty_print=True, xml_declaration=True,   encoding="utf-8")

Here's a succinct answer

from lxml import etreeroot = etree.Element("root")root.set("interesting", "somewhat")child1 = etree.SubElement(root, "test")my_tree = etree.ElementTree(root)with open('./filename', 'wb') as f:    f.write(etree.tostring(my_tree))

you simply place your node in a new tree and write that out to disk. Also works for HtmlElements produced by xpath searches.