Duplicate current set of snapshots, changing the versions on the copies

duplicate_snapshots.py

#!/usr/bin/env python3

import argparse
import glob
import shutil
import re

arg_parser = argparse.ArgumentParser()
arg_parser.add_argument('--reference-image-folder',
        dest='reference_image_folder')
arg_parser.add_argument('--previous-version', dest='previous_version')
arg_parser.add_argument('--new-versions', nargs='+', dest='new_versions')

args = arg_parser.parse_args()
glob_pattern = '{}/**/*.png'.format(args.reference_image_folder)

for snapshot_file in glob.iglob(glob_pattern):
    for new_version in args.new_versions:
        duplicated_file = re.sub(args.previous_version, new_version,
                snapshot_file)

        if duplicated_file != snapshot_file:
            shutil.copy(snapshot_file, duplicated_file)