functions

Python Functions

Python Functions

Functions allow you to group code into reusable blocks. Functions in Python are defined using the def keyword.

Defining a Function

Here's how to define and call a function:

      
        def greet(name):
            print("Hello, " + name + "!")
        
        greet("Alice")

This function takes one argument, name, and prints a greeting.

Returning Values

Functions can return values using the return keyword:

      
        def add(x, y):
            return x + y
        
        result = add(5, 3)
        print(result)

This function returns the sum of x and y.

Activity

Try It Yourself!

Create a function that takes a number as an argument and returns its square.

Quick Quiz

Quick Quiz

  1. What keyword is used to define a function in Python?
  2. What does the return keyword do in a function?

Answers: Use def to define a function. The return keyword is used to return a value from a function.