python lxml - modify attributes

Question

from lxml import objectify, etree

root = etree.fromstring(\'\'\'


    

        

Answer 1

import lxml.etree as et

tree = et.fromstring('''
... your xml ...
''')

for host_ip in tree.xpath("/scenario/init/send/command[@name='CER']/avp[@name='Host-IP-Address']"):
    host_ip.attrib['value'] = 'foo'

print et.tostring(tree)

Answer 2

You could try this:

r = etree.fromstring('...')

element = r.find('//avp[@name="Host-IP-Address"]')

# Access value
print 'Current value is:', element.get('value')

# change value
element.set('value', 'newvalue')

Also, note that in your example you're using the text() method, but that's not what you want: the "text" of an element is what is enclosed by the element. For example, given this:

<someelement>this is the text</someelement>

The value of the text() method on the <somevalue> element is "this is the text".