Resizing image uploads in Django

organization_logo = models.ImageField(
    verbose_name='Associated image (145 x 145)',
    upload_to=profile_images_upload_path,
    blank=True,
    null=True)

def clean_organization_logo(self):
    img = self.cleaned_data.get('organization_logo')

    return utils.resize_image(145, 145, img)

import _io
import io
from PIL import Image
from resizeimage import resizeimage


def resize_image(width, height, image_upload):
    # I don't know why this needs the type check, but sometimes
    # img.file is an image byte array and sometimes it's a
    # temporary file wrapper. This function handles both of those
    # eventualities

    if not image_upload:
        return image_upload

    with Image.open(image_upload.file) as image:
        cover = resizeimage.resize_cover(image, [width, height])

        if type(image_upload.file) is _io.BytesIO:
            img_byte_arr = io.BytesIO()
            cover.save(img_byte_arr, image.format)
            image_upload.file = img_byte_arr
        else:
            cover.save(image_upload.file.name, image.format)

    return image_upload