import os


path_to_old_images = '/unsupervised-old'
path_to_new_images = '/unsupervised-new'
images_per_directory = 1000

for i, filename in enumerate(os.listdir(path)):
    if i % images_per_directory == 0:
        target_dir = os.path.join(path_to_new_images, '{:05}'.format(i))
        os.system('mkdir -p {}'.format(target_dir))
    source = os.path.join(path_to_old_images, filename)
    target = os.path.join(target_dir, filename)
    os.system('cp {} {}'.format(source, target))