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This is an example of using Python and Chalice to run an AWS Lambda function behind an AWS API gateway. The Lambda function has access to write to a DynamoDB table.

1. Install Python 3.6.X: https://www.python.org/downloads/release/python-369/

• Chalice supports all versions of Python that AWS Lambda supports (2.7 and 3.6).

2. Install the AWS CLI: https://aws.amazon.com/cli/
3. Configure the AWS CLI with an IAM user that has programmatic access enabled by running aws configure. The user should have permissions to create API Gateways, IAM roles, and Lambda functions in the region you have configured.
4. Install Chalice and Boto3: python -m pip install chalice && python -m pip install boto3

• Depending on your operating system and how you installed Python 3, you may need to do some additional work to set up pip. (e.g. on CentOS yum install -y python-pip).

5. Run chalice deploy

• Again, depending on how you installed Python, you may need to add the Python Scripts folder to your PATH environment variable. You can also try python -m chalice

6. Open the IAM service in the AWS Console and go to Roles. Attach the AmazonDynamoDBFullAccess policy to the lambda-dyanmodb-example-dev role created by Chalice.
7. Create a DynamoDB table using CloudFormation by running make table or aws cloudformation deploy --template-file resources.json --stack-name devices-table
8. Get the name of the table by running make table-info or aws dynamodb describe-table --table-name $(aws cloudformation describe-stacks --query "Stacks[0].Outputs[?OutputKey=='DevicesTableName'].OutputValue" --output text)
9. Replace the table_name variable in app.py with the output from the previous step.
10. Invoke the function using cURL or your preferred http client: curl -X PUT https://<YOUR_API_GATEWAY_ID>.execute-api.<YOUR_REGION>.amazonaws.com/api/insert -H "Content-Type:application/json" -d @event.json

For more information on how to configure the deployment (Lambda functions's compute specifications, tagging, roles, environment variables) see https://chalice.readthedocs.io/en/latest/topics/configfile.html.

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