Functions

What You’ll Learn

A function is a block of code which only runs when it is called. You’ll learn how to define and execute them.

Defining a Function

In Python, a function is defined using the def keyword.

def my_function():
    print("Hello from a function!")

Calling a Function

To call a function, use the function name followed by parenthesis.

def my_function():
    print("Hello from a function!")

# Call it!
my_function()
my_function()

Expected Output:

Hello from a function!
Hello from a function!

Why use Functions?

Functions allow you to reuse code instead of rewriting it. If you need to fix a bug or change behavior, you only have to update the code inside the function, and it applies everywhere the function is called!