Which code snippet correctly checks if an event has been processed before in a Python event consumer?

easy📝 Conceptual Q3 of 15

Microservices - Event-Driven Architecture

Aprocessed_events.add(event.id) if event.id in processed_events: return

Bif event.id in processed_events: return processed_events.add(event.id)

Cif event.id not in processed_events: return processed_events.add(event.id)

Dif event.id == processed_events: return processed_events.add(event.id)

Step-by-Step Solution

Solution:

Step 1: Understand the logic to skip duplicates
If the event ID is already in the set, skip processing by returning early.
Step 2: Add event ID after confirming it's new
Only add the event ID to the set after confirming it wasn't processed before.
Final Answer:
if event.id in processed_events: return processed_events.add(event.id) -> Option B
Quick Check:
Check before add = Correct idempotency check [OK]

Quick Trick: Check membership before adding to processed set [OK]

Common Mistakes:

MISTAKES

Master "Event-Driven Architecture" in Microservices

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Microservices Quizzes