pretty json

import argparse
import collections
import json


def main(argv=None):
    parser = argparse.ArgumentParser()
    parser.add_argument('json_file')
    args = parser.parse_args(argv)

    with open(args.json_file, 'r') as f:
        ugly_json = json.load(f, object_pairs_hook=collections.OrderedDict)

        with open(args.json_file, 'w') as w:
            json.dump(ugly_json, w, indent=2)


if __name__ == "__main__":
    exit(main())