import json
import argparse

parser = argparse.ArgumentParser(description='JSON TOOL')

parser.add_argument('file')

args = parser.parse_args()

if args.file:
    with open(args.file, 'r', encoding='utf8', errors='strict') as json_file:
        obj = json.load(json_file)

    with open('pretty_'+args.file, 'w', encoding='utf8', errors='strict') as json_file:
        json.dump(obj, json_file, indent=4, ensure_ascii=False)