Generate thumbnails from files in a directory using Python PILkit Library

image generatory.py

import logging
import os
import pilkit.processors
import sys
import getopt
from PIL import Image
from PIL import ImageDraw, ImageOps
from pilkit.processors import Transpose, Adjust
from pilkit.utils import save_image

# dictionary list of sizes to be outputed
sizes = {'small': (100,100), 'med': (400,400), 'large': (600,400)}

def makeFolders():
    "create separate folders for images to be placed based on dictionary size keys"
    for size in sizes:
        if not os.path.exists(size):
            # make the path
            os.makedirs(size)

makeFolders()
# foldername is the name of folder or path to folder you want to process images
for root, dirs, files in os.walk('clients'):
    for file in files:
      # get all files with jpg extensions for processing only
        if file.endswith('.jpg'):
          #iterate the dictionary and grab keys and value pairs
            for size, dimensions in sizes.items():
                img = Image.open(os.path.join(root,file))
                img.thumbnail(dimensions)
                #  save each image into separate folders according to dimensions in dictionary
                name = '{0}x{1}_resized_{2}'.format(dimensions[0],
                                                    dimensions[1], file)
                img.save(os.path.join(size, name))
                print (os.path.join(size, name))