Django: Download Image from URL, Resize it, append "small" to the end of the filename

Django: Download Image from URL, Resize it, append "small" to the end of
the filename

I'm looking for a way to download an 640x640 image from a URL, resize the
image to 180x180 and append the word small to the end of the resized image
filename.
For example, the image is located at this link
http://0height.com/wp-content/uploads/2013/07/18-japanese-food-instagram-1.jpg
Once resized, I would like to append the world small to the end of the
filename like so: 18-japanese-food-instagram-1small.jpeg
How can this be done? Also will the downloaded image be saved to memory or
will it save to the actual drive? If it does save to the drive, is it
possible to delete the original image and keep the resized version?