ImageOps any method call

imageops_method.py

from PIL import Image, ImageOps
import sys

if len(sys.argv) < 4:
    print ("Usage: python imageopt_test.py <grayscale|equalize|...> [<value>] <infile> <outfile>\n")
    print (dir(ImageOps))
    exit (0);

method = sys.argv[1]
if len(sys.argv) == 4:
    value = None
    infile, outfile = sys.argv[2], sys.argv[3]
else:
    value = float(sys.argv[2])
    infile, outfile = sys.argv[3], sys.argv[4]

im = Image.open(infile)

func = getattr(ImageOps, method);
if value is None:
    im = func(im);
else:
    im = func(im, value);

im.save(outfile)
im.show()