For Marie

image_renamer.py

import exifread
import os
import sys
import re
dir_name = sys.argv[1]
print dir_name

regex = re.compile('[0-9]{8}\_[0-9]{6}\.')
DATE_TAG ='EXIF DateTimeOriginal'
EXTENSIONS=['jpg','jpeg']
for (base_folder,sub_folders,file_names) in os.walk(dir_name):
    for file_name in file_names:
        extension = file_name.split('.')[1]
        groups =regex.match(file_name)
        if extension.lower() not in EXTENSIONS or groups:
            if not groups:
                print 'Skipping %s' % (file_name)
            continue
        full_name = os.path.join(base_folder,'',file_name)
        fh = open(full_name,'rb')
        tags = exifread.process_file(fh)
        if DATE_TAG in tags:
            reformatted_timestamp = tags[DATE_TAG].values.replace(':','').replace(' ','_')
            print '%s -> %s (%s)' % (file_name,reformatted_timestamp,extension) 
            os.rename(full_name,os.path.join(base_folder,reformatted_timestamp+'.'+extension))