Core Python Programming

map()

The map() built-in function is similar to filter() in that it can process a sequence through a function. However, unlike filter(), map() “maps” the function call to each sequence item and returns a list consisting of all the return values.

In its simplest form, map() takes a function and sequence, applies the function to each item of the sequence, and creates a return value list that is comprised of each application of the function. So if your mapping function is to add 2 to each number that comes in and you feed that function to map() along with a list of numbers, the resulting list returned is the same set of numbers as the original, but with 2 added to each number. If we were to code how this simple form of map() works in Python, it ...