Building Lambda functions with Python - Amazon Lambda
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Building Lambda functions with Python

You can run Python code in Amazon Lambda. Lambda provides runtimes for Python that run your code to process events. Your code runs in an environment that includes the SDK for Python (Boto3), with credentials from an Amazon Identity and Access Management (IAM) role that you manage.

Lambda supports the following Python runtimes.

Name Identifier SDK Operating system Architectures Deprecation (Phase 1)

Python 3.11


boto3-1.27.1 botocore-1.30.1

Amazon Linux 2

x86_64, arm64

Python 3.10


boto3-1.26.90 botocore-1.29.90

Amazon Linux 2

x86_64, arm64

Python 3.9


boto3-1.26.90 botocore-1.29.90

Amazon Linux 2

x86_64, arm64

Python 3.8


boto3-1.26.90 botocore-1.29.90

Amazon Linux 2

x86_64, arm64

Python 3.7


boto3-1.26.90 botocore-1.29.90

Amazon Linux


Nov 27, 2023

The runtime information in this table undergoes continuous updates. For more information on using Amazon SDKs in Lambda, see Managing Amazon SDKs in Lambda functions in Serverless Land.

To create a Python function
  1. Open the Lambda console.

  2. Choose Create function.

  3. Configure the following settings:

    • Function name: Enter a name for the function.

    • Runtime: Choose Python 3.11.

  4. Choose Create function.

  5. To configure a test event, choose Test.

  6. For Event name, enter test.

  7. Choose Save changes.

  8. To invoke the function, choose Test.

The console creates a Lambda function with a single source file named lambda_function. You can edit this file and add more files in the built-in code editor. To save your changes, choose Save. Then, to run your code, choose Test.


The Lambda console uses Amazon Cloud9 to provide an integrated development environment in the browser. You can also use Amazon Cloud9 to develop Lambda functions in your own environment. For more information, see Working with Amazon Lambda functions using the Amazon Toolkit in the Amazon Cloud9 user guide.


To get started with application development in your local environment, deploy one of the sample applications available in this guide's GitHub repository.

Sample Lambda applications in Python
  • blank-python – A Python function that shows the use of logging, environment variables, Amazon X-Ray tracing, layers, unit tests and the Amazon SDK.

Your Lambda function comes with a CloudWatch Logs log group. The function runtime sends details about each invocation to CloudWatch Logs. It relays any logs that your function outputs during invocation. If your function returns an error, Lambda formats the error and returns it to the invoker.