Class design

Design the helper library class skeleton.

Project: Utility library

In this 5-lesson project you'll build a reusable utility library. Each lesson adds one piece, and by the final lesson you'll have a working module.

You'll use what you learned in previous groups: classes, methods and class attributes. Throughout the project you'll design a Utility class: a structure that bundles string, number and date helper methods in one package.

Utility class skeleton

We'll start the project with a class named Utility. We'll add a class attribute to its body: version = "1.0". This shows the library version.

Example: class Utility:\n version = "1.0". The class name starts with an uppercase letter; the body is indented after a colon. Access it via Utility.version; no instance is needed.

Exercise Define the Utility class

Write the first piece of this project. Define a class named Utility. Add the class attribute version = "1.0" in the body. After the class, print the version with print(Utility.version).

Show example solution

class Utility:
    version = "1.0"

print(Utility.version)

Test yourself

Why bundle helpers in a class?
- It bundles data and behavior in one unit, easing reuse
- It slows code down but improves readability
- It is only used for file operations
- It makes variable definitions unnecessary
Show answer

It bundles data and behavior in one unit, easing reuse — A class groups related methods in one unit, so you can reuse the code in other projects.

Complete the class declaration

class ____:
    version = "1.0"

Show answer

class Utility:
    version = "1.0"

Match the class parts

Utility

Class name
version

Class attribute
Utility.version

Access via class

Next lesson: String helpers

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