POC Architecture & System Design 3

Question 1

Which Python pattern separates the construction of a complex object from its representation?

Accepted Answer

Builder

Answer

The Builder pattern uses a director and builder classes to construct complex objects step-by-step, separating construction logic from the final representation.

Question 2

In a Python application using the Repository pattern, what is the primary responsibility of the repository class?

Accepted Answer

To abstract data access and provide collection-like interfaces for domain objects

Answer

The Repository pattern abstracts the data layer, providing a clean interface for accessing domain objects without exposing database implementation details.

Question 3

Which Python architectural approach best supports the principle of 'separation of concerns' in a web application?

Accepted Answer

Model-View-Controller (MVC) or Model-View-Template (MVT)

Answer

MVC/MVT separates data models, presentation logic, and business/control logic into distinct layers, keeping concerns isolated and maintainable.

Question 4

What is the main advantage of using Python's `asyncio` event loop in a high-concurrency system design?

Accepted Answer

It handles thousands of concurrent I/O-bound operations without blocking threads

Answer

asyncio uses cooperative multitasking to handle many I/O-bound operations concurrently on a single thread without thread overhead.

Question 5

In a Python service using the Command pattern, what does the 'invoker' component do?

Accepted Answer

Triggers command execution without knowing the concrete command details

Answer

The invoker holds a reference to a command object and triggers its execute() method, decoupling the caller from the receiver of the action.

(POC) Python Online Certification Practice Test

(POC) Python Online Certification Practice Test

POC Architecture & System Design 3