Python Maps Tutorial

In this tutorial we cover the map function within the Python programming language

Author: Elliot Forbes | Posted at: 24.05.2017 07:57

This tutorial was built using Python 3.6

Maps in Python are syntactic sugar that allow you to very succinctly iterate through every element of an array and perform a function on it.

Imagine we started off with a list of values numbering from 2-6 like so:

values = [2,3,4,5,6]

And we had a function which doubled said values:

def double(x):
  return x * 2

With the use of maps we would have to do something like so in order to multiply every element:

for value in values:
  value = double(value)

but with maps we can be far more succinct:

results = list(map(double, values))

Complete Example

Below you’ll find a complete exmaple for a simple map which applies the double function to every element in the values array.

values = [2,3,4,5,6]

def double(x):
  return x * 2

results = list(map(double, values))

this produces the following output:

[4, 6, 8, 10, 12, 14, 16]

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