Resize images in multiple directories with Python

resizer.py

# example folder structure
# images
# ----  Tigers
# -------------1_tigers.jpg
# -------------2_tigers.jpg
# -------------2_tigers.png
# -------------n_tigers.jpg
# ---- Cats
# -------------1_cats.jpg
# -------------2_tcats.jpg
# -------------2_cats.png
# -------------n_cats.jpg

# Run the script with this steps : 

# 1. Open your terminal, and type
# 2. python resizer.py {img source folder} {the size you want the image to be} {destination folder}
#    example : 
#    python resizer.py /home/ubuntu/images/ 128 /home/ubuntu/new_images
# 3. Drink your coffee and watch the terminal running the process 

import PIL
from PIL import Image
import os
import sys
def readf():
    try:
        input_dir  = str(sys.argv[1].rstrip('/'))  #path to img source folder
        img_size   = str(sys.argv[2])  #The image size (128, 256,etc)
        output_dir  = str(sys.argv[3].rstrip('/')) #output directory
        print "starting...."
        print "Colecting data from %s " % input_dir
        tclass = [ d for d in os.listdir( input_dir ) ]
        counter = 0
        strdc = ''
        hasil = []
        for x in tclass:
           list_dir =  os.path.join(input_dir, x )
           list_tuj = os.path.join(output_dir+'/', x+'/')
           if not os.path.exists(list_tuj):
                os.makedirs(list_tuj)
           if os.path.exists(list_tuj):
               for d in os.listdir(list_dir):
                   try:
                       img = Image.open(os.path.join(input_dir+'/'+x,d))
                       wpercent = (float(img_size)/float(img.size[0]))
                       hsize = int((float(img.size[1])*float(wpercent)))
                       img = img.resize((int(img_size),hsize), Image.ANTIALIAS)
                       fname,extension = os.path.splitext(d)
                       newfile = fname+extension
                       if extension != ".jpg" :
                           newfile = fname + ".jpg"
                       img.save(os.path.join(output_dir+'/'+x,newfile),"JPEG",quality=90)
                       print "Resizing file : %s - %s " % (x,d)
                   except Exception,e:
                        print "Error resize file : %s - %s " % (x,d)
                        sys.exit(1)
               counter +=1
    except Exception,e:
        print "Error, check Input directory etc : ", e
        sys.exit(1)
readf()

If Received This Error
ModuleNotFoundError: No module named 'PIL'
Then
pip install Pillow