ElementTree

import xml.etree.ElementTree as et

if __name__ == '__main__':
    tree = et.parse("xml_folder/country.xml")
    print(type(tree))
    print(tree)
    root = tree.getroot()
    print(type(root))
    print(root)

    for child in root:
        child.text = child.text.upper()

        child.attrib["iso"] = "45"
        print(child.text, child.attrib)


    tree.write("xml_folder/country_2.xml")