PCPP2 Design Patterns Practice Question
Which Python design principle is most strongly supported by the Adapter pattern?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Open/Closed Principle
The Adapter pattern allows incompatible interfaces to work together, promoting the Open/Closed Principle by allowing new adapters without changing existing code.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Single Responsibility Principle
Why it's wrong here
While it isolates interface adaptation, it's not the primary principle.
- ✗
Dependency Inversion Principle
Why it's wrong here
While related, the Adapter's primary goal is interface compatibility.
- ✓
Open/Closed Principle
Why this is correct
It allows adding functionality (via new adapters) without modifying existing client code.
- ✗
Liskov Substitution Principle
Why it's wrong here
Adapter often violates Liskov because it wraps objects, it doesn't necessarily fulfill the base class interface.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP2 practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCPP2 exam.