What are “modules” and why should you care?

Step 1 – What are “modules” and why should you care?

You are not here to reinvent the wheel—you’re here to build games. Python agrees. That’s why it comes with modules: ready-made code you can plug into your game.

  • Module = a Python file that contains useful code (functions, variables, classes).
  • Think of it as a toolbox you can borrow instead of building every tool yourself.

You “borrow” a toolbox with the import keyword.

Your first import: the math toolbox

Engine loading… please wait.

What’s going on here?

import math
You’re telling Python: “Load the math toolbox so I can use its stuff.”
math.sqrt(25)
Uses the square root function from the math module.
Result: 5.0
math.pi
Gives you the value of π (pi).
Result:3.141592653589793 (aka “the circle guy”)

⚡ Quick challenge

Change the code below so it prints the square root of 64 instead of 25.

  • Change the number inside sqrt(…) to 64.
  • Update the text to “Square root of 64:”.
Practice editor ready. Modify the code and click Run.
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