solid

Explain and demonstrate the five SOLID principles with Python code examples.

Updated Mar 8, 2026
One-click install
npx skills add https://github.com/messeb/skills --skill solid-messeb
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: solid
Source: https://github.com/messeb/skills/tree/main/plugins/general-developer/skills/solid
Command: npx skills add https://github.com/messeb/skills --skill solid-messeb

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers understand and apply the five SOLID principles of object-oriented design, leading to more maintainable, flexible, and robust code.

Core Features & Use Cases

  • Code Examples: Illustrates each SOLID principle (SRP, OCP, LSP, ISP, DIP) with clear Python code examples, showing both anti-patterns and best practices.
  • Audit Checklist: Provides a practical checklist for reviewing codebases for SOLID violations.
  • Decision Framework: Offers a simple question-based framework to guide the application of each principle.
  • Use Case: A developer is refactoring a complex class and wants to ensure it adheres to the Single Responsibility Principle. They can consult the SRP section for clear examples and the audit checklist to identify potential issues.

Quick Start

Review the provided Python code examples for the Open/Closed Principle.

Frequently Asked Questions about solid

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I apply SOLID principles when refactoring Python code?

To apply SOLID principles during refactoring, use the provided decision framework and audit checklist to identify object-oriented design violations, guiding architectural improvements with clear Python examples for each principle.

What are the five SOLID principles of object-oriented design?

The five SOLID principles are Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. These object-oriented design patterns solve specific architectural problems to make codebases more maintainable and flexible.

How do I check my codebase for SOLID design pattern violations?

You can check for SOLID violations using an audit checklist designed to review codebases. It helps identify anti-patterns in object-oriented design by evaluating your Python code against the expected behavior of each principle.

How do SOLID principles relate to KISS, YAGNI, DRY, and SoC?

SOLID principles relate to KISS, YAGNI, DRY, and SoC by complementing them as a broader software architecture framework. While DRY reduces duplication and SoC separates concerns, SOLID provides specific object-oriented design rules for structural integrity.

What is the best way to implement the Open/Closed Principle in Python?

The best way to implement the Open/Closed Principle is by reviewing Python code examples that contrast anti-patterns with best practices. This demonstrates how to design modules that are open for extension but closed for modification.

When should I not use SOLID principles in software architecture?

You should not use SOLID principles when they introduce unnecessary complexity conflicting with KISS or YAGNI. Over-engineering object-oriented design patterns for simple scripts can reduce code quality rather than improve it. Focus on practical application over strict adherence.