Find cr2 files, that have no corresponding jpg file. Because when I sort pictures, I do it using the jpgs. But I want to delete the original cr2 file, too.

cr2stat.py

#!/usr/bin/env python

import argparse
import os
from os.path import expanduser
import re

parser = argparse.ArgumentParser(description="Remove raw images without matching jpg (because the jpgs have been removed). Works only for Canon Files. Requires exiftool")
parser.add_argument("directory", metavar="dir", help="scope for image search to work on")
parser.add_argument("-f", "--force", action='store_true', help="delete detected files, instead of just display them")
args = parser.parse_args()

def get_file_index(file):
    """
    get the canon file index (camera internal counter for pictures)
    """
    import subprocess
    import shlex

    COMMAND = '/usr/bin/exiftool -canon:fileindex'
    args = shlex.split(COMMAND)
    args.append(file)
    p = subprocess.Popen(args, stdout=subprocess.PIPE)
    read = p.stdout.read()

    index = re.match(r".*\s(\d+).*", read)

    if index:
        return index.group(1)

    return 0


def find_singles(directory, force_delete):
    """
    find cr2 files without matching jpg file
    """
    jpg_list = find_files(directory, 'jpg')
    raw_list = find_files(directory, 'cr2')

    jpg_index = dict([(get_file_index(image), image) for image in jpg_list])
    jpg_index[0] = 'dummy'

    for x in raw_list:
        index = get_file_index(x)
        if index != 0 and index not in jpg_index:
            if force_delete:
                os.unlink(x)
            yield x

# yes, this method could be done more efficient, walking just one time through the files.
def find_files(path, extension):
    """
    find all files in a path with a specific extension (case insensitive)
    """
    p = re.compile(r'^.*\.%s$' % extension, re.IGNORECASE)
    for dir, sub_dirs, files in os.walk(path):
        for file in files:
            if p.match(file):
                yield os.path.join(dir, file)

single_list = find_singles(expanduser(args.directory), args.force)

if args.force:
    print("Deleted:")
for x in single_list:
    print(x)