batch_rotate.py

import os
from multiprocessing import Pool
import glob

def mk_3_rotate(filename):
	os.system("convert -rotate 90 {0} 90_{0}".format(filename[1]))
	os.system("convert -rotate 180 {0} 180_{0}".format(filename[1]))
	os.system("convert -rotate 270 {0} 270_{0}".format(filename[1]))

if __name__ == '__main__':
	# folder = os.getcwd()
	images = glob.glob('*.JPG')
	img_c = list(enumerate(images, 0))
	pool = Pool()
	pool.map(mk_3_rotate, img_c)
	pool.close()
	pool.join()