A python script for formatting lots of xml files in a directory.

format_xml.py

import glob
import subprocess

# Replace this file directory with the location of the xml files
files = glob.glob('/home/isaac/Desktop/work_area/test2_xml/*.xml')
for xml_file in files:

    bashCmd = ["xmllint","-format", "-o", "{}".format(xml_file), "{}".format(xml_file)]

    process = subprocess.Popen(bashCmd, stdout=subprocess.PIPE)

    output, error = process.communicate()

print("Successfully formatted all xml files or I failed. Could be either.")