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# Lambda code examples for the SDK for Python

## Overview

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

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*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](https://aws.amazon.com/pricing/?aws-products-pricing.sort-by=item.additionalFields.productNameLowercase&aws-products-pricing.sort-order=asc&awsf.Free%20Tier%20Type=*all&awsf.tech-category=*all) and [Free Tier](https://aws.amazon.com/free/?all-free-tier.sort-by=item.additionalFields.SortRank&all-free-tier.sort-order=asc&awsf.Free%20Tier%20Types=*all&awsf.Free%20Tier%20Categories=*all).
* 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](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege).
* This code is not tested in every AWS Region. For more information, see [AWS Regional Services](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services).

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## Code examples

### Prerequisites

For prerequisites, see the [README](../../README.md#Prerequisites) 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
```

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### Single actions

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

* [Create a function](lambda_basics.py#L135) (`CreateFunction`)
* [Delete a function](lambda_basics.py#L169) (`DeleteFunction`)
* [Get a function](lambda_basics.py#L113) (`GetFunction`)
* [Invoke a function](lambda_basics.py#L183) (`Invoke`)
* [List functions](lambda_basics.py#L251) (`ListFunctions`)
* [Update function code](lambda_basics.py#L207) (`UpdateFunctionCode`)
* [Update function configuration](lambda_basics.py#L230) (`UpdateFunctionConfiguration`)

### Scenarios

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

* [Get started with functions](lambda_handler_basic.py)

### Cross-service examples

Sample applications that work across multiple AWS services.

* [Create a REST API to track COVID-19 data](../../cross_service/apigateway_covid-19_tracker)
* [Create a lending library REST API](../../cross_service/aurora_rest_lending_library)
* [Create a messenger application](../../cross_service/stepfunctions_messenger)
* [Create a websocket chat application](../../cross_service/apigateway_websocket_chat)
* [Use API Gateway to invoke a Lambda function](../../example_code/lambda)
* [Use scheduled events to invoke a Lambda function](../../example_code/lambda)

## Run the examples

### Instructions


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#### Get started with functions

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.

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

```
python lambda_handler_basic.py
```


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### Tests

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


To find instructions for running these tests, see the [README](../../README.md#Tests)
in the `python` folder.


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## Additional resources

* [Lambda Developer Guide](https://docs.aws.amazon.com/lambda/latest/dg/welcome.html)
* [Lambda API Reference](https://docs.aws.amazon.com/lambda/latest/dg/API_Reference.html)
* [SDK for Python Lambda reference](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/lambda.html)

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SPDX-License-Identifier: Apache-2.0