<?xml version="1.0"?>

<data>

    <country name="Liechtenstein">

        <rank>1</rank>

        <year>2008</year>

        <gdppc>141100</gdppc>

        <neighbor name="Austria" direction="E"/>

        <neighbor name="Switzerland" direction="W"/>

    </country>

    <country name="Singapore">

        <rank>4</rank>

        <year>2011</year>

        <gdppc>59900</gdppc>

        <neighbor name="Malaysia" direction="N"/>

    </country>

    <country name="Panama">

        <rank>68</rank>

        <year>2011</year>

        <gdppc>13600</gdppc>

        <neighbor name="Costa Rica" direction="W"/>

        <neighbor name="Colombia" direction="E"/>

    </country>

</data>

#!/usr/bin/python

# -*- coding=utf-8 -*-

import xml.etree.ElementTree as ET

from xml.etree.ElementTree import Element

tree = ET.parse('countries.xml')

nodes = tree.findall("country")

for node in nodes:

#search node & attribute & text

    print ("*****Country*****")

    if node.attrib["name"]:

        print ("Name:",node.attrib["name"])

    rank=node.find("rank")

    print ("Rank:",rank.text)

    year=node.find("year")

    print ("Year:",year.text)

    gdppc=node.find("gdppc")

    print ("Gdppc:",gdppc.text)

    neighbors=node.findall("neighbor")

    for neighbor in neighbors:

        print ("Neighbor:",neighbor.attrib["name"])

#add node

    rank=node.find("rank")

    element=Element("rank_next", {"name":"Rank","create":""})

    element.text=""

    rank.append(element)

#delete node

    year=node.find("year")

    node.remove(year)

#add node attribute

    node.set("force","NewForce")

#update node attribute

    node.set("name","NewNode")

#delete node attribute

    neighbors=node.findall("neighbor")

    for neighbor in neighbors:

        del neighbor.attrib["direction"]

#add node text

    neighbors=node.findall("neighbor")

    for neighbor in neighbors:

        neighbor.text = "Hello,Neighbor"

#update node text

    gdppc=node.find("gdppc")

    gdppc.text = ""

#delete node text

    rank=node.find("rank")

    rank.text = ""  

tree.write("./out.xml", encoding="utf-8",xml_declaration=True)

>python test_ET.py

*****Country*****

Name: Liechtenstein

Rank: 1

Year: 2008

Gdppc: 141100

Neighbor: Austria

Neighbor: Switzerland

*****Country*****

Name: Singapore

Rank: 4

Year: 2011

Gdppc: 59900

Neighbor: Malaysia

*****Country*****

Name: Panama

Rank: 68

Year: 2011

Gdppc: 13600

Neighbor: Costa Rica

Neighbor: Colombia

<?xml version='1.0' encoding='utf-8'?>

<data>

    <country force="NewForce" name="NewNode">

        <rank><rank_next create="20151231" name="Rank">5</rank_next></rank>

        <gdppc>11111</gdppc>

        <neighbor name="Austria">Hello,Neighbor</neighbor>

        <neighbor name="Switzerland">Hello,Neighbor</neighbor>

    </country>

    <country force="NewForce" name="NewNode">

        <rank><rank_next create="20151231" name="Rank">5</rank_next></rank>

        <gdppc>11111</gdppc>

        <neighbor name="Malaysia">Hello,Neighbor</neighbor>

    </country>

    <country force="NewForce" name="NewNode">

        <rank><rank_next create="20151231" name="Rank">5</rank_next></rank>

        <gdppc>11111</gdppc>

        <neighbor name="Costa Rica">Hello,Neighbor</neighbor>

        <neighbor name="Colombia">Hello,Neighbor</neighbor>

    </country>

</data>

write(file, encoding="us-ascii", xml_declaration=None, default_namespace=None, method="xml")

Writes the element tree to a file, as XML. file is a file name, or a file object opened for writing. encoding [1] is the output encoding (default is US-ASCII). xml_declaration controls if an XML declaration should be added to the file. Use False for never, True for always, None for only if not US-ASCII or UTF-8 (default is None). default_namespace sets the default XML namespace (for “xmlns”). method is either "xml", "html" or "text" (default is "xml"). Returns an encoded string.