Python Functions

Repeated code can work perfectly well—right up until it needs to change. This Block introduces functions as named, reusable pieces of Python code that keep repeated tasks in one place.

You will define functions with def, choose clear names, write indented function bodies, and call the same function as many times as needed. Along the way, you will see how Python moves through a function call, how familiar tools such as loops fit inside functions, and how to avoid common mistakes with parentheses, colons, indentation, and definition order.

What you will learn:

• Why repeated code becomes difficult to maintain
• How to define a function with def, parentheses, a colon, and an indented body
• The difference between defining a function and calling it
• How to call one function multiple times
• How clear function names make programs easier to understand
• How to spot and fix common function syntax mistakes

By the end, you will be able to turn repeated steps into clear, named tasks and make small Python programs easier to read and update.