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For every 8th index in the string we slice a string of length 8 and append it to the list of octets. I urge you to give them a test drive if you haven't already. Let me know how you use comprehensions in the comments section.

Artoo is a very brave and quite stubborn astromech droid dating from 33 BBY.

We are trying to have a meaningful conversation with R2-D2, but he just bleeps and bloops in a seemingly random pattern. Let's start out by creating a list of all the possible permutations of 2 droids the old school way: takes an iterable which is exactly what you get from a generator expression).

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These solutions would arguably be more terse and efficient in some cases.

I don't have anything against the standard library.

It seemed to be looking for someone*No, I haven’t- *I said, not even bothered now to talk out loud to the thing; I always talked to my cars too.

And as expected with everything I liked, I wanted to keep it, or at least keep it close and so within two seconds I was beside it, still looking at all its moving parts almost as if checking out a girl.*Who’s Luke? But when it suddenly responded to it with actual words of gratitude, I shot up again- looking around frantically for someone trying to mess with me.

When programming in Python, these collections of things are usually represented as lists, sets and dictionaries.

Oftentimes, what I want to do with collections is to transform them in various ways.

To me there is a certain elegance and beauty in the explicit nature of comprehensions. For this example we are making a dating service for heroic droids.

Everything you need to know is right there in the code in a concise and readable form – no need to dig through the docs. List, set, and dictionary comprehensions are available in Python 2.7 and above, but the functions and syntax used in the examples might not be available/valid for other versions of Python. We want a list of all the ways to match up 2 droids from the following list: to do this, but for now let's imagine it doesn't exist and that we have to write our own code for once.

-- The Zen of Python I frequently deal with collections of things in the programs I write.

Collections of droids, jedis, planets, lightsabers, starfighters, etc.

Artoo rolled along, though his dome and sensors moved around, obviously still looking for Luke.

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