Sorts bracketed photos into 3 subfolders

sort.py

#!/usr/bin/env python
# -*- coding: utf_8 -*
#
# Script to sort bracketed photos by exposure into bins.
# Default assumes 3 photos per bracket set, into 3 folders
#
# Alex Mandel 2014
# tech@wildintellect.com
# requires python

import os
import shutil

#assumes current directory has the photos

def photolist(directory):
    '''get list of photos in the directory'''
    #TODO: support raw file sorting too instead and in addition to jpg
    extension = ".jpg"
    list_of_files = [file for file in os.listdir(directory) if file.lower().endswith(extension)]
    return(list_of_files)

def makefolders(fold):
    #TODO: take an arbitrary number of folders to sort
    [os.mkdir(name) for name in fold if not os.path.exists(name)]
    return

def sort(plist,fold):
    '''sort the photos'''
    #The 1st photo in the set to base the sorting off
    #If it ever gets up to 9999 on the photo number this will all break 
    start = int(plist[0][4:8])
    
    for item in plist:
        #sort the photos, awesome idea from ntw @ LUGOD
        #modulo is by length of folder list
        f = ((int(item[4:8])-start) % len(fold))
        shutil.move(item, fold[f])
    
    return


if __name__ == '__main__':
    #TODO: take command line parameters
    directory = os.curdir
    fold = ["one","two","three"]
    try:
        os.chdir(directory)
        photos = photolist(directory)
        makefolders(fold)
        sort(photos, fold)
    except Exception as e:
        print(" ".join(["Something failed because of",str(e)]))
    #finally: