Comprehensions in Python are a concise syntax for describing lists, sets or dictionaries in a declarative or functional style. This short-hand is readable and expressive, meaning that comprehensions are very effective at communicating intent to human readers. Some comprehensions almost read like natural language, making them nicely self-documenting.
Comprehensions
List comprehensions
As hinted at above, a list comprehension is a short-hand way of creating a list. It's an expression using a succinct syntax that describes how list elements are defined. Comprehensions are much easier to demonstrate than they are to explain, so let's bring up a Python REPL. First we'll create a list of words by splitting a string...
