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AWS Runtime Migration Error Map: What Breaks First on Each Upgrade Path

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AWS will block Python 3.9 Lambda function creates and updates starting February 2027, forcing developers to migrate to newer runtimes. A structured error map published on DEV Community sequences the specific errors developers will encounter for each upgrade path — Python 3.9 to 3.12, 3.12 to 3.13, and Node.js 16/18 to 20/22 — in the order they typically appear. Python 3.12 migrations front-load the most breakage due to mass stdlib removals under PEP 594, including modules like distutils, imp, and asyncore, while Node.js upgrades center on AWS SDK v2 no longer being pre-installed and OpenSSL 3 rejecting legacy cryptographic formats. Each error listed in the map links to a dedicated fix, allowing teams to anticipate and resolve issues before they surface in production. The resource is intended as a sequenced reference guide rather than a deep-dive explainer, helping developers debug runtime upgrades more efficiently.

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