ElementTree find（）始终返回“无” Cisco iOS XE

Question

When using find function always none is returned

I've tried differents types of tags and none is always returned.

This is the XML response i'm getting

<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:62b25025-051e-4cd7-ad9f-ab0d5e21b634">
   <data>
      <native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
         <interface>
            <GigabitEthernet>
               <name>1</name>
               <ip>
                  <address>
                     <dhcp />
                  </address>
               </ip>
               <mop>
                  <enabled>false</enabled>
                  <sysid>false</sysid>
               </mop>
               <negotiation xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-ethernet">
                  <auto>true</auto>
               </negotiation>
            </GigabitEthernet>
         </interface>
      </native>
   </data>
</rpc-reply>

This is the find statement im using.

address = get_reply.data.find('{http://cisco.com/ns/yang/Cisco-IOS-XE-ethernet}interface')

I expect to get the tag.

Thanks in advance :)

Answer 1

find , on its own, doesn't recurse. Using ETXPath lets you get recursion (using // ) and specify the namespace inline:

>>> import lxml.etree
>>> root = lxml.etree.fromstring('''
... <?xml version="1.0" encoding="UTF-8"?>
... <rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:62b25025-051e-4cd7-ad9f-ab0d5e21b634">
...    <data>
...       <native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
...          <interface>
...             <GigabitEthernet>
...                <name>1</name>
...                <ip>
...                   <address>
...                      <dhcp />
...                   </address>
...                </ip>
...                <mop>
...                   <enabled>false</enabled>
...                   <sysid>false</sysid>
...                </mop>
...                <negotiation xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-ethernet">
...                   <auto>true</auto>
...                </negotiation>
...             </GigabitEthernet>
...          </interface>
...       </native>
...    </data>
... </rpc-reply>
... '''.strip().encode('utf-8')
>>> lxml.etree.ETXPath('//{http://cisco.com/ns/yang/Cisco-IOS-XE-native}interface')(root)
[<Element {http://cisco.com/ns/yang/Cisco-IOS-XE-native}interface at 0x101cc8410>]

Also, note that the correct namespace for what you wanted to retrieve was the one ending in interface , not native .

Answer 2

Here (The code is not using any external library - just core python)

import xml.etree.ElementTree as ET

xml = '''<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:62b25025-051e-4cd7-ad9f-ab0d5e21b634">
   <data>
      <native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
         <interface>
            <GigabitEthernet>
               <name>1</name>
               <ip>
                  <address>
                     <dhcp />
                  </address>
               </ip>
               <mop>
                  <enabled>false</enabled>
                  <sysid>false</sysid>
               </mop>
               <negotiation xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-ethernet">
                  <auto>true</auto>
               </negotiation>
            </GigabitEthernet>
         </interface>
      </native>
   </data>
</rpc-reply>'''


root = ET.fromstring(xml)
interface = root.getchildren()[0].getchildren()[0].getchildren()[0]
print(interface)
gigabit_ethernet_name = interface.getchildren()[0].getchildren()[0].text
print('gigabit_ethernet_name: {}'.format(gigabit_ethernet_name))

output

<Element '{http://cisco.com/ns/yang/Cisco-IOS-XE-native}interface' at 0x023E3A20>
gigabit_ethernet_name: 1