python lxml – modify attributes
Question:
from lxml import objectify, etree
root = etree.fromstring('''<?xml version="1.0" encoding="ISO-8859-1" ?>
<scenario>
<init>
<send channel="channel-Gy">
<command name="CER">
<avp name="Origin-Host" value="router1dev"></avp>
<avp name="Origin-Realm" value="realm.dev"></avp>
<avp name="Host-IP-Address" value="0x00010a248921"></avp>
<avp name="Vendor-Id" value="11"></avp>
<avp name="Product-Name" value="HP Ro Interface"></avp>
<avp name="Origin-State-Id" value="1094807040"></avp>
<avp name="Supported-Vendor-Id" value="10415"></avp>
<avp name="Auth-Application-Id" value="4"></avp>
<avp name="Acct-Application-Id" value="0"></avp>
<avp name="Vendor-Specific-Application-Id">
<avp name="Vendor-Id" value="11"></avp>
<avp name="Auth-Application-Id" value="4"></avp>
<avp name="Acct-Application-Id" value="0"></avp>
</avp>
<avp name="Firmware-Revision" value="1"> </avp>
</command>
</send>
</init>
<traffic>
<send channel="channel-Gy" >
<action>
<inc-counter name="HbH-counter"></inc-counter>
....
</action>
</send>
</traffic>
</scenario>''')
How can I modify/set both values?
-
Host-IP-Address value=”0x00010a248921″
-
“Vendor-Id” value=”11″
I’ve unsuccessfully tried accessing
root.xpath("//scenario/init/send_channel/command[@name='CER']/avp[@name='Host-IP-Address']/value/text()")
Goal: I’d preferably like to see a lxml.objectify vs an Xpath solution but I’ll accept other lxml based solutions.
The files are <100kB so speed/RAM is not much of a concern.
Answers:
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)
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”.
from lxml import objectify, etree
root = etree.fromstring('''<?xml version="1.0" encoding="ISO-8859-1" ?>
<scenario>
<init>
<send channel="channel-Gy">
<command name="CER">
<avp name="Origin-Host" value="router1dev"></avp>
<avp name="Origin-Realm" value="realm.dev"></avp>
<avp name="Host-IP-Address" value="0x00010a248921"></avp>
<avp name="Vendor-Id" value="11"></avp>
<avp name="Product-Name" value="HP Ro Interface"></avp>
<avp name="Origin-State-Id" value="1094807040"></avp>
<avp name="Supported-Vendor-Id" value="10415"></avp>
<avp name="Auth-Application-Id" value="4"></avp>
<avp name="Acct-Application-Id" value="0"></avp>
<avp name="Vendor-Specific-Application-Id">
<avp name="Vendor-Id" value="11"></avp>
<avp name="Auth-Application-Id" value="4"></avp>
<avp name="Acct-Application-Id" value="0"></avp>
</avp>
<avp name="Firmware-Revision" value="1"> </avp>
</command>
</send>
</init>
<traffic>
<send channel="channel-Gy" >
<action>
<inc-counter name="HbH-counter"></inc-counter>
....
</action>
</send>
</traffic>
</scenario>''')
How can I modify/set both values?
-
Host-IP-Address value=”0x00010a248921″
-
“Vendor-Id” value=”11″
I’ve unsuccessfully tried accessing
root.xpath("//scenario/init/send_channel/command[@name='CER']/avp[@name='Host-IP-Address']/value/text()")
Goal: I’d preferably like to see a lxml.objectify vs an Xpath solution but I’ll accept other lxml based solutions.
The files are <100kB so speed/RAM is not much of a concern.
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)
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”.