Parsing XML Tips

## Mainly to get the information from virsh dumpxml output 

SYNTAX COMMON FOR ALL EXAMPLES :

from xml.etree import ElementTree
document = ElementTree.parse('domain1.xml')
root = document.getroot()

## To print all the immediate child of root along with the attribute information of each immediate child.
## Note : This one is not nested 

for child in root:
    print child.tag, child.attrib

Ouptut : 

name {}
uuid {}
memory {'unit': 'KiB'}
currentMemory {'unit': 'KiB'}
vcpu {'placement': 'static'}
os {}
features {}
cpu {'mode': 'custom', 'match': 'exact'}
clock {'offset': 'utc'}
on_poweroff {}
on_reboot {}
on_crash {}
pm {}
devices {}

## Printing the particular xml tag from anywhere in file without using path

Ex 1 : 

for child in root.iter('type'):
    print child.attrib
    
Output : 
{'machine': 'pc-i440fx-rhel7.0.0', 'arch': 'x86_64'}

Ex 2 : Printing all MAC addresses for xml file.

for child in root.iter('mac'):
    print child.attrib
    
Output :

{'address': '52:54:00:00:c2:df'}

Ex 3 : Modifying example 2 to pring only MAC address value.

for child in root.iter('mac'):
    print child.attrib['address']
    
Output:

52:54:00:00:c2:df

Ex 4 : To pring the UUID information of domain.

for child in root.iter('uuid'):
    print child.text

Output : 

63d91bd8-bcb1-477b-ba44-9202f0d7dca5
    
## Printing specific attribute using for loop.

Input : 

  <devices>
    <interface type='network'>
      <mac address='52:54:00:89:a8:9b'/>
      <source network='default' bridge='virbr0'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
  </devices>

Logic : 

for interfaces in root.findall('devices/interface'):
    for parameters in interfaces.getchildren():
        if parameters.tag == 'address':
            print parameters.attrib['domain']

Output : 

0x0000