Save image from URL to ImageField

example.py

from django.core.files.base import ContentFile

from urllib.parse import urlparse
from urllib.request import urlopen

# Example URL
image_url = 'images.com/image.png'

# `obj` has `image` field
sample_obj = SampleObject.objects.first()

# Totally works for Django 1.10 and Python 3.6.4
name = urlparse(self.icon_url).path.split('/')[-1]
content = ContentFile(urlopen(self.icon_url).read())
sample_obj.image.save(name, content, save=True)