Image converter to WEBP using Python + Pillow

converter.py

from os import listdir, makedirs
from os.path import exists, dirname, realpath, splitext, join
from PIL import Image

__dirname: str = dirname(realpath(__file__))

if not exists(join(__dirname, "image-input")):
    print('Please create a folder named "image-input" and put your images in it.')
    exit()

if not exists(join(__dirname, "image-output")):
    makedirs(join(__dirname, "image-output"))


for file in listdir(join(__dirname, "image-input")):
    image = Image.open(join(__dirname, "image-input", file))
    filename_without_extension = splitext(file)[0]

    image.save(
        join(__dirname, "image-output", f"{filename_without_extension}.webp"),
        "webp",
        lossless=True,
        quality=100,
        method=6,
        exact=True,
    )

    print(f"Images compressed successfully for {file}!")