Unlocking AWS Lambda Potential: A Python Guide with Practical Examples

def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': 'Hello from Lambda!'
    }

Explanation:

lambda_handler: The main function that AWS Lambda calls when the function is triggered.
event: An event parameter containing information about the triggering event.
context: An object containing information about the execution context.
The function returns a dictionary with a status code and a message in the response body.

import json

def lambda_handler(event, context):
    # Process S3 event
    for record in event['Records']:
        bucket = record['s3']['bucket']['name']
        key = record['s3']['object']['key']
        print(f'File {key} is added to {bucket}')
    return {
        'statusCode': 200,
        'body': json.dumps('S3 event processed successfully')
    }

Explanation:

The function processes S3 events triggered by new objects being added to the bucket.
It extracts information such as bucket name and object key from the event.
The function prints a message and returns a response indicating successful processing.

import json

def lambda_handler(event, context):
    # Process DynamoDB stream event
    for record in event['Records']:
        if record['eventName'] == 'INSERT':
            new_item = record['dynamodb']['NewImage']
            print(f'New item added: {json.dumps(new_item)}')
    return {
        'statusCode': 200,
        'body': json.dumps('DynamoDB stream event processed successfully')
    }

Explanation:

The function processes DynamoDB stream events triggered by item inserts.
It extracts information about the new item and prints a message.
The function returns a response indicating successful processing.

import json

def lambda_handler(event, context):
    # Handle API Gateway proxy integration
    request_body = json.loads(event['body'])
    response_body = {'message': f'Hello, {request_body["name"]}!'}
    return {
        'statusCode': 200,
        'body': json.dumps(response_body)
    }

Explanation:

The function handles API Gateway proxy integration, extracting data from the request body.
It constructs a response body based on the received data.
The function returns a response with a customized message.
Remember to set up the necessary permissions, configure triggers, and adapt the code to your specific use case before deploying these Lambda functions in AWS.