Lesson 3 of 100

Separating Concerns in Code

Master the Single Responsibility Principle (SRP) to build resilient, testable code modules.

Briefing

Concepts

Mission 1

Mission 2

Complete

Pyfessor

Lesson Briefing

"Complexity is a choice. We choose simplicity by ensuring every function, class, and module has exactly one reason to change. If your 'User' class also sends emails and connects to the database, it is fragile. We extract these into 'Services' and 'Repositories'."