How to use xml.etree.ElementTree

Python 3.8.2

xml.etree.ElementTree --- ElementTree XML API

Perth

From file

import xml.etree.ElementTree as ET
tree = ET.parse('country_data.xml')
root = tree.getroot()

From a string

root = ET.fromstring(country_data_as_string)

Search

Search only * direct child elements * of the current element by tag

#List is returned
list = root.findall('country'):

Search only the first element found by tag

elem = root.find('country'):

Search by XPath expression

root.findall("./country/neighbor")

Access to content and attributes

Access content

rank = country.find('rank').text

Access attributes

 #Either
 country.get('name')
 country.attrib['name']

Generation of child elements

elem = ET.SubElement(root,'country')
elem = ET.SubElement(root,'country', attrib={'name':'Liechtenstein'})

Delete child element

>>> for country in root.findall('country'):
...     # using root.findall() to avoid removal during traversal
...     rank = int(country.find('rank').text)
...     if rank > 50:
...         root.remove(country)
...

output

Output to sys.stdout

ET.dump(root)

Output to file

tree = ET.ElementTree(root)
tree.write('filename', encoding="utf-8", xml_declaration=True)

Output to file with line breaks

import xml.dom.minidom as md
document = md.parseString(ET.tostring(root, 'utf-8'))
with open(fname,'w') as f:
    document.writexml(f, encoding='utf-8', newl='\n', indent='', addindent='  ')

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