The Absolute Beginner's Guide to Python Programming: A Step-by-Step Guide with Examples and Lab Exercises

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

K. WilsonThe Absolute Beginner's Guide to Python Programminghttps://doi.org/10.1007/978-1-4842-8716-3_6

6. Using Functions

Kevin Wilson¹  

(1)

London, UK

 

Functions help break a program into smaller pieces. This avoids repetition of code, making larger programs more efficient and easier to maintain.

A function is a block of code that is only executed when called within a program.

You can pass data to the function. This data is known as a parameter or argument.

Arguments or parameters are specified inside parentheses after the function name, for example:

functionName(parameters)

A function can return data as a result.

Declaring Functions

You can declare a new function ...