import sys
from PIL import Image

if len(sys.argv)>=2:
    filepaths = sys.argv[1:]
else:
    print("Must specify target file(s)!")
    sys.exit()

MAXSIZE = (120, 120)
for filepath in filepaths:
    print(filepath)
    image = Image.open(filepath)
    image.thumbnail(MAXSIZE)
    thumbfilepath = filepath[:-4]+'.thumb'+filepath[-4:]
    print(thumbfilepath)
    image.save(thumbfilepath)