format_xml.py

#!/usr/bin/env python

import argparse
from xml.dom.minidom import parseString

def parse_args(args=None):
    parser = argparse.ArgumentParser()
    parser.add_argument('input')
    parser.add_argument('output')

    args = parser.parse_args(args)
    return args

def main(args=None):
    args = parse_args(args)

    text = open(args.input, 'rb').read()
    xml = parseString(text).toprettyxml()
    open(args.output, 'wb').write(xml)

if __name__ == '__main__':
    main()