Hints

To obtain a hard-to-guess URL, what you can do is this.

Use the random-generator module of python, via

import random

and get a random long integer, see here, for example via

m = random.getrandbits(60)

You need to store this long integer in the database table where you store the image. When somebody asks for a URL like:

/default/view/985934239847/

You look up 985934239847 in the table, and you show the image.