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Welcome to the AWS Code Examples Repository. This repo contains code examples used in the AWS documentation, AWS SDK Developer Guides, and more. For more information, see the Readme.md file below.

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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/?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).
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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.
* [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`)
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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
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