[Solved] Given this Python Lambda handler:def handler(event, context): print('Start') return event['key']What happens if the event does not contain 'key'? | AWS

AWS - Lambda

Given this Python Lambda handler:

def handler(event, context):
    print('Start')
    return event['key']

What happens if the event does not contain 'key'?

AThe function raises a KeyError and fails

BThe function returns None

CThe function returns an empty string

DThe function retries automatically

Step-by-Step Solution

Solution:

Step 1: Analyze event dictionary access
Accessing event['key'] when 'key' is missing raises a KeyError in Python.
Step 2: Understand Lambda behavior on exceptions
Lambda function fails and returns an error if an exception is raised and not handled.
Final Answer:
The function raises a KeyError and fails -> Option A
Quick Check:
Missing key in event = KeyError raised [OK]

Quick Trick: Access missing dict keys carefully to avoid errors [OK]

Common Mistakes:

MISTAKES

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