"Want to write shorter, cleaner code? Have an unfortunate situation where you need to fit as much as you can in one expression? Prefer a quick dose of hacks to spending the rest of your life reading the docs? You’ve come to the right place. We start out with some quick tricks that you might have figured out if you’ve spent some time with Python, but I promise there’s more crazy stuff towards the bottom."
This is a great python reference site, it cleared up my understanding of list comprehensions within python (and a few other things, to boot!)