Rename JPEG images with EXIF data according to date

imgren.py

import sys
import os
from datetime import datetime

from PIL import Image

# Keys of items that may contain date
items = [36868, 36867, 306]

# Output date format
format = '%Y-%m-%d %H.%M.%S'

for filename in sys.argv[1:]:
    img = Image.open(filename)
    EXIF = img._getexif()
    del img
    for item in items:
        datestr = EXIF.get(item, '')
        try:
            date = datetime.strptime(datestr, '%Y:%m:%d %H:%M:%S')
            break
        except ValueError:
            date = None
    if date:
        path, _ = os.path.split(filename)
        _, ext = os.path.splitext(filename)
        new_filename = os.path.join(path, date.strftime(format))
        i = ''
        while True:
            try:
                os.rename(filename, new_filename + i + ext)
                print '%s -> %s' % (filename, new_filename + i + ext)
                break
            except:
                i = '.01' if not i else '.' + str(int(i.strip('.')) + 1).zfill(2)