Lambda code examples for the SDK for Python

Overview

Shows how to use the AWS SDK for Python (Boto3) to work with AWS Lambda.

Lambda allows you to run code without provisioning or managing servers.

⚠ Important

• Running this code might result in charges to your AWS account. For more details, see AWS Pricing and Free Tier.
• Running the tests might result in charges to your AWS account.
• We recommend that you grant your code least privilege. At most, grant only the minimum permissions required to perform the task. For more information, see Grant least privilege.
• This code is not tested in every AWS Region. For more information, see AWS Regional Services.

Code examples

Prerequisites

For prerequisites, see the README in the python folder.

Install the packages required by these examples by running the following in a virtual environment:

python -m pip install -r requirements.txt

Get started

• Hello Lambda (ListFunctions)

Basics

Code examples that show you how to perform the essential operations within a service.

• Learn the basics

Single actions

Code excerpts that show you how to call individual service functions.

• CreateFunction
• DeleteFunction
• GetFunction
• Invoke
• ListFunctions
• UpdateFunctionCode
• UpdateFunctionConfiguration

Scenarios

Code examples that show you how to accomplish a specific task by calling multiple functions within the same service.

• Create a REST API to track COVID-19 data
• Create a lending library REST API
• Create a messenger application
• Create a websocket chat application
• Use API Gateway to invoke a Lambda function
• Use scheduled events to invoke a Lambda function

Run the examples

Instructions

Hello Lambda

This example shows you how to get started using Lambda.

python hello/hello_lambda.py

Learn the basics

This example shows you how to do the following:

• Create an IAM role and Lambda function, then upload handler code.
• Invoke the function with a single parameter and get results.
• Update the function code and configure with an environment variable.
• Invoke the function with new parameters and get results. Display the returned execution log.
• List the functions for your account, then clean up resources.

Start the example by running the following at a command prompt:

python lambda_handler_basic.py

Create a REST API to track COVID-19 data

This example shows you how to create a REST API that simulates a system to track daily cases of COVID-19 in the United States, using fictional data.

Create a lending library REST API

This example shows you how to create a lending library where patrons can borrow and return books by using a REST API backed by an Amazon Aurora database.

Create a messenger application

This example shows you how to create an AWS Step Functions messenger application that retrieves message records from a database table.

Create a websocket chat application

This example shows you how to create a chat application that is served by a websocket API built on Amazon API Gateway.

Use API Gateway to invoke a Lambda function

This example shows you how to create an AWS Lambda function invoked by Amazon API Gateway.

Use scheduled events to invoke a Lambda function

This example shows you how to create an AWS Lambda function invoked by an Amazon EventBridge scheduled event.

Tests

⚠ Running tests might result in charges to your AWS account.

To find instructions for running these tests, see the README in the python folder.

Additional resources

• Lambda Developer Guide
• Lambda API Reference
• SDK for Python Lambda reference

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SPDX-License-Identifier: Apache-2.0