Python Upgrade for AWS Lambda

2021-06-16 Compute Daniel Sablosky

Amazon Web Services (AWS) has ended their support of Python 2.7, requiring many AWS Lambda functions to be upgraded from Python 2 to 3. The Runtime settings can be updated in the AWS console or with the update-function-configuration command in the AWS CLI, and then the changes can be tested and deployed. The Python community provides guidance for porting Python 2 code to Python 3 as well as a library to translate this code called lib2to3 at:

Automated Python 2 to 3 code translation

To install the module:

$ pip install 2to3

The Python library includes the creation of a diff:

$ 2to3 lambda_function.py

In order to write the changes back to the source file:

$ 2to3 -w lambda_function.py

This also produces a backup file should further testing fail.

AWS provides further support for upgrading Lambda functions from Python 2 to Python 3 at:

Announcing end of support for Python 2.7 in AWS Lambda