3. ImageOps mirror

See: https://pillow.readthedocs.io/en/stable/reference/ImageOps.html#PIL.ImageOps.mirror

3.1. Mirror

Use the ImageOps.mirror(image) method to return an image that has been flipped horizontally (left to right).
from PIL import Image, ImageOps

with Image.open("test_images/shapes.png") as im:
    im1 = ImageOps.mirror(im)
    im1.save("imageOps/mirror.png")
../_images/compare_mirror.png