Use text file to provide input for etree xml - python-2.7

Question

I have a xml file and I need to change 2 parameters in this xml file from the etee.
XML file:
<?xml version="1.0"?>
<ABC_Input xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<REQ>
<!-- Optional in XSD -->
<INFO>ALL</INFO>
</REQ>
<PO>
<PO_ID>3557698</PO_ID>
<!-- Req in XSD -->
<RAN>HQF011512C</RAN>
<!-- Req in XSD -->
</PO>
</ABC_Input>
I have written below code to achieve this
import xml.etree.ElementTree as ET
tree = ET.parse('alpha.xml')
root = tree.getroot()
for val in root.findall('PO')
val.find('RAN').text="HQ123"
tree.write('output1.xml')
Now I need to pass value of RAN & PO_ID from text file as input then how is that possible?

Answer 1

Try this:
import xml.etree.ElementTree as ET
# Read the file (called alpha.txt) and extract the lines
lines = []
with open('alpha.txt', 'r') as txtF:
lines = txtF.readlines()
# A dictionary to hold PO_ID and RAN values
values = {}
# If there are multiple values of PO_ID or RAN then it will take the last entry in the text file
for line in lines:
line = line.strip()
if 'RAN' in line:
values['RAN'] = line[line.find('RAN')+len('RAN')+1:]
elif 'PO_ID' in line:
values['PO_ID'] = line[line.find('PO_ID')+len('PO_ID')+1:]
else:
continue
tree = ET.parse('alpha.xml')
root = tree.getroot()
for val in root.findall('PO'):
val.find('PO_ID').text = values['RAN']
val.find('RAN').text = values['PO_ID']
tree.write('output1.xml')