Create squere image on python

image_squere.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from PIL import Image

def image_squere(filepath):
    img = Image.open(filepath)

    width, height = img.size

    if width > height:
        delta = width - height
        left = int(delta/2)
        upper = 0
        right = height + left
        lower = height
    else:
        delta = height - width
        left = 0
        upper = int(delta/2)
        right = width
        lower = width + upper

    img = img.crop((left, upper, right, lower))
    img.save(filepath)


image_squere('horse_porn.jpg')