List comprehensions

A list comprehension is a syntactic construct available in some programming languages for creating a list based on existing lists. It follows the form of the mathematical set-builder notation (set comprehension) as distinct from the use of map and filter functions.

Consider the following example in set-builder notation.

This can be read, "${\displaystyle S}$ is the set of all numbers "2 times ${\displaystyle x}$" where ${\displaystyle x}$ is an item in the set of natural numbers (${\displaystyle \mathbb {N} }$), for which ${\displaystyle x}$ squared is greater than ${\displaystyle 3}$."

...
Wikipedia