In our last course, we learned about loops to repeat actions. Maybe we could reuse entire chunks of code across different parts of our program.

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Have you ever wished you could copy-paste code but make it smarter?

That's where functions come in! A function is like a mini-program inside your main program. You write the code once, give it a name, and then "call" it whenever you need it.

Think of it like having a helpful assistant.

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What would you name yours?

Functions help us avoid writing the same code over and over. Instead of copying and pasting, we create a function once and use it multiple times. This makes our code cleaner and easier to fix.

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Can you think of any repetitive tasks in your daily life?

Here's the basic structure of creating a function in Python. We start with def, then the function name, parentheses, and a colon. The function's code goes on the next lines, indented.

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Notice how similar this looks to if statements?

Let's create our first function! This one will print a simple greeting:

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We've defined the function, but nothing happens yet. Why do you think that is?