Introduction to Functions

As your programs get bigger, you'll find yourself writing the same code over and over. Functions are here to help!

A function is a reusable block of code that performs a specific task. You define it once and can use it many times.

Here's how to define a simple function:

def greet():
print("Hello, world!")

'def' is the keyword to define a function. 'greet' is the name of our function. To run the code inside the function, you "call" it by its name:

greet()

This will print "Hello, world!".

Functions can also take inputs, called 'parameters' or 'arguments'.

def greet_user(name):
print(f"Hello, {name}!")

greet_user("Bob") # This will print "Hello, Bob!"

And they can also return a value:

def add(a, b):
return a + b

sum_result = add(5, 3)
print(sum_result) # This will print 8

Functions are essential for writing clean, organized, and efficient code.