Christopher Pitt experimented a bit with generators and wrote down the thought process on his blog.

Generators are awesome. If they’re new to you then take some time to read where they come from and what they do. If you’ve come from a particular programming language background, they may be difficult for you to understand.

They were, and continue to be, tricky for me to grasp. So I’ve spent loads of time trying to understand them, and what they can do for my code.