Rename images in DropBox folder to facilitate sorting by date

dropbox-rename.py

#!/usr/bin/env python

# Rename files in DropBox folder to allow easy sorting by date.
# If a JPG files contains EXIF data recognised by DropBox we
# rename it from e.g. "IMG_1234.JPG" to "2016-01-01 10:20:30 IMG_1234.JPG"

# Requires access token obtained from DropBox API page.

# By Michael Ludvig <mludvig@logix.net.nz>
# License Public Domain (it's too simple a script to deserve any licensing protection :)

from __future__ import print_function

import os
import sys
import re
import dropbox
import argparse

parser = argparse.ArgumentParser()
parser.add_argument("--folder", type=str, default='', help="Dropbox folder name to process, e.g. '/Family Photos/Sunday Trip'")
parser.add_argument("--access-token", type=str, required=True, help="Dropbox API access token. Can be a file containing only the token and nothing else.")
parser.add_argument("--do-it", action="store_true", help="Rename the files as suggested. Otherwise only print what would be done.")
args = parser.parse_args()

if os.access(args.access_token, os.R_OK):
    access_token = open(args.access_token, 'r').readline().strip()
else:
    access_token = args.access_token

dbx = dropbox.Dropbox(access_token)

files = dbx.files_list_folder(args.folder, include_media_info=True)
for item in files.entries:
    ts = None
    if item.__class__ == dropbox.files.FolderMetadata:
        print("%-25s %s" % ("DIR", item.path_display))
        continue
    if item.__class__ != dropbox.files.FileMetadata:
        print("%-25s %s" % ("UNKNOWN", item.path_display))
        continue
    dirname = "/".join(item.path_display.split('/')[:-1])
    basename = item.path_display.split('/')[-1]
    if re.match('[12]\d{3}-\d{2}-\d{2}', basename):
        # Probably starts with a timestamp: 2016-01-01 ...
        print("%-25s %s" % ("NO-CHANGE", item.path_display))
        continue
    if not item.media_info or not item.media_info.is_metadata():
        print("%-25s %s" % ("NO-TIMESTAMP", item.path_display))
        continue
    md = item.media_info.get_metadata()
    if not md.time_taken:
        print("%-25s %s" % ("NO-TIMESTAMP", item.path_display))
        continue
    ts = md.time_taken.strftime('%Y-%m-%d %H-%M-%S')
    new_name = "%s/%s %s" % (dirname, ts, basename)
    if not args.do_it:
        print('%-25s %s  ->  %s' % ("RENAME", item.path_display, new_name))
    else:
        print('%-25s %s  ->  %s' % ("RENAMING", item.path_display, new_name), end=" ")
        sys.stdout.flush()
        dbx.files_move(item.path_display, new_name)
        print("[done]")

if not args.do_it:
    print("\nNo changes have been made. Use --do-it to actually rename the files.")