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7/22/2026
SOLID Design Principles in Python: A Practical Walkthrough

SOLID Design Principles in Python: A Practical Walkthrough

Original: SOLID Design Principles: Stop Writing Code That Breaks When You Touch It

Short summary

A walkthrough of SOLID design principles using Python code examples, starting with SRP (Single Responsibility) and OCP (Open-Closed). Demonstrates refactoring a Bird class from conditional-laden code to polymorphic and composition-based patterns. Advocates composition over inheritance for larger teams to reduce coupling and regression risk.

  • •SRP: each class should have one reason to change, shown via Bird sound refactoring
  • •OCP: open for extension, closed for modification via polymorphism or composition
  • •Composition preferred over inheritance for reducing coupling in team codebases

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