Simple multithreaded PSD layer slicer and PNG exporter (created as a PS CC -> Unity 3D pipeline for pixel-art animations)

pipeline.py

#!/usr/bin/env python

from psd_tools import PSDImage, Layer, Group
from sys import argv, exit
from multiprocessing.dummy import Pool
from typing import List

psds: List[PSDImage] = []

def split_export(psd: PSDImage) -> None:
    for el in psd.layers:
        if isinstance(el, Layer):
            el.as_PIL().save('./{}.png'.format(el.name))
        elif isinstance(el, Group):
            for l in el.layers:
                l.as_PIL().save('./{}.png'.format(l.name))

if __name__ == '__main__':
    if len(argv[1:]) == 0:
        print("""
        Usage:
        pipeline.py <PSD path> <PSD path>...
        """)
        exit(0)
    for arg in argv[1:]:
        psds.append(PSDImage.load(arg))
    pool = Pool(len(psds))
    pool.apply(split_export, psds)

setup.py

from setuptools import setup

setup(
    name='pipeline',
    install_requires=[
        'Pillow',
        'psd-tools'
    ]
)