Lambda handler function structure in AWS - Mini Project: Build & Apply

Lambda handler function structure

📖 Scenario: You are creating a simple AWS Lambda function. This function will receive an event and context, and return a response. Lambda functions are small pieces of code that run in the cloud when triggered.

🎯 Goal: Build a basic AWS Lambda handler function in Python that accepts event and context parameters and returns a simple dictionary response.

📋 What You'll Learn

Create a function named lambda_handler

The function must accept two parameters: event and context

Return a dictionary with a statusCode of 200 and a body message 'Hello from Lambda!'

💡 Why This Matters

🌍 Real World

AWS Lambda functions are used to run code in response to events without managing servers. This basic structure is the foundation for many serverless applications.

💼 Career

Understanding Lambda handler functions is essential for cloud developers and engineers working with AWS serverless technologies.

1

Create the Lambda handler function

Create a function named lambda_handler that accepts two parameters: event and context. Leave the function body empty for now.

AWS

def lambda_handler(event, context):
    # Your code here

Need a hint?

Define the function with the exact name and parameters as shown.

2

Add a response dictionary

Inside the lambda_handler function, create a variable named response that is a dictionary with keys statusCode set to 200 and body set to the string 'Hello from Lambda!'.

AWS

def lambda_handler(event, context):
    # Create the response dictionary here
    # Your code here

Need a hint?

Use a Python dictionary with the exact keys and values.

3

Return the response from the function

Add a return statement inside the lambda_handler function to return the response dictionary.

AWS

def lambda_handler(event, context):
    response = {
        'statusCode': 200,
        'body': 'Hello from Lambda!'
    }
    # Return the response dictionary
    # Your code here

Need a hint?

Use the return keyword to send back the response.

4

Complete Lambda handler function

Ensure the full lambda_handler function is defined with parameters event and context, creates the response dictionary, and returns it.

AWS

def lambda_handler(event, context):
    response = {
        'statusCode': 200,
        'body': 'Hello from Lambda!'
    }
    return response
# Your code here

Need a hint?

Review the full function to confirm it matches the required structure.