Functions and How They Work

Imagine having to copy and paste the same block of code again and again. Tedious, right? That’s where functions come in. They help you reuse code, organize your logic, and make your programs easier to read and maintain.

In this article, we’ll break down what functions are, why they matter, and how to use them in your programs. We’ll keep it simple, clear, and full of easy examples.

What is a Function?

A function is a block of code that performs a specific task. You can define it once and use it whenever you need it.

Think of it like a blender: you throw in ingredients (inputs), press a button (call the function), and get a smoothie (output).

Why Use Functions?

• Avoid repetition — Write once, use many times
• Stay organized — Keep code tidy and logical
• Make changes easier — Update the function in one place
• Work in teams — Break up tasks into manageable pieces

Defining a Function in Python

def greet():
    print("Hello there!")

This function is called greet. When you run greet(), it prints a message.

Calling the Function