POC Architecture & System Design 2

Question 1

Which Python design pattern ensures a class has only one instance and provides a global access point to it?

Accepted Answer

Singleton

Answer

The Singleton pattern restricts instantiation to one object by controlling the class's __new__ or __init__ method.

Question 2

In a Python microservices architecture, what is the primary purpose of an API Gateway?

Accepted Answer

To serve as a single entry point routing requests to backend services

Answer

An API Gateway acts as a reverse proxy that routes client requests to appropriate microservices and can handle cross-cutting concerns like auth and rate limiting.

Question 3

Which Python library is commonly used to implement asynchronous task queues in a distributed system?

Accepted Answer

Celery

Answer

Celery is a distributed task queue library for Python that enables offloading work to background workers using brokers like Redis or RabbitMQ.

Question 4

What does the acronym SOLID stand for in object-oriented design as applied to Python?

Accepted Answer

Single, Open, Liskov, Interface, Dependency

Answer

SOLID stands for Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion principles.

Question 5

When designing a Python system that must handle millions of events per second, which architecture pattern is most appropriate?

Accepted Answer

Event-driven architecture with message streaming

Answer

Event-driven architecture with message streaming (e.g., Kafka) decouples producers and consumers, enabling high-throughput real-time processing.

(POC) Python Online Certification Practice Test

(POC) Python Online Certification Practice Test

POC Architecture & System Design 2