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Hi guys,

I'm grading HW4. Some of you did a really good job with correct results generated in an efficient way, while others are still struggling to deploy your code to AWS. If you are one of those, please check if this hint helps or not.

This whole assignment is to simulate a real life problem, where you write some codes and you want to provide your codes as a service to your customers. In this stage you are asked to use AWS lambda as a third party platform to deploy your codes. Of course no textbook will cover how to use AWS, this is a problem we programmers always encounter in reality. But we can always explore right?

Here is how I explored the lambda function, simply edit the starter code a little bit to check what we can get from the parameters.

import json

def lambda_handler(event, context):
    # TODO implement
    return {
        'statusCode': 200,
        'body': json.dumps(event)
    }

A screenshot is attached here.

Use the API Gateway to create a trigger for your function. AWS will give you a URL like this:

https://xxxxxxxx.execute-api.ap-northeast-1.amazonaws.com/default/demo

Let's append a parameter to it, click it and see what happens.

https://xxxxxxxx.execute-api.ap-northeast-1.amazonaws.com/default/demo?courseid=qtm

The output is a json object, we can see the courseid in its queryStringParameters field.

Then, you can retrieve the requested courseid from the event, and call your tiny get_exam function right?

• If you encounter any errors, just google it since you're not the first one who have such errors.
• Do things step by step. Don't rush to upload a whole zip to AWS and gave up if it failed.

Hope it helps.