Class design
- Python course
- Intermediate
- Lesson 13/116
- 6 min
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.
Practice 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).
Starter code
# Define the Utility classSample solution
class Utility:
version = "1.0"
print(Utility.version)Expected output
1.0
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Why bundle helpers in a class?
- It bundles data and behavior in one unit, easing reuse Correct answer
- It slows code down but improves readability
- It is only used for file operations
- It makes variable definitions unnecessary
Explanation: A class groups related methods in one unit, so you can reuse the code in other projects.
2 Complete the class declaration
class ____:
version = "1.0"class Utility:
version = "1.0"Explanation: Class names use PascalCase; Utility starts with an uppercase letter.
3 Match the class parts
| Term | Meaning |
|---|---|
Utility |
Class name |
version |
Class attribute |
Utility.version |
Access via class |