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# Lambda code examples for the SDK for Python
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## Overview
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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. _
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## ⚠ Important
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* Running this code might result in charges to your AWS account. For more details, see [AWS Pricing ](https://aws.amazon.com/pricing/ ) and [Free Tier ](https://aws.amazon.com/free/ ).
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* Running the tests might result in charges to your AWS account.
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* 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 ).
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* 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
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### 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.
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- [Create a function ](lambda_basics.py#L144 ) (`CreateFunction` )
- [Delete a function ](lambda_basics.py#L185 ) (`DeleteFunction` )
- [Get a function ](lambda_basics.py#L118 ) (`GetFunction` )
- [Invoke a function ](lambda_basics.py#L200 ) (`Invoke` )
- [List functions ](lambda_basics.py#L280 ) (`ListFunctions` )
- [Update function code ](lambda_basics.py#L226 ) (`UpdateFunctionCode` )
- [Update function configuration ](lambda_basics.py#L254 ) (`UpdateFunctionConfiguration` )
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### Scenarios
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Code examples that show you how to accomplish a specific task by calling multiple
functions within the same service.
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- [Get started with functions ](lambda_handler_basic.py )
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### Cross-service examples
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Sample applications that work across multiple AWS services.
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- [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 )
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## Run the examples
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### Instructions
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#### Get started with functions
This example shows you how to do the following:
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- 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:
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```
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python lambda_handler_basic.py
```
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### Tests
⚠ Running tests might result in charges to your AWS account.
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To find instructions for running these tests, see the [README ](../../README.md#Tests )
in the `python` folder.
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## Additional resources
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- [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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---
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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0