Guide: How Engineering Teams Can Migrate from Python 3.10/3.11 to Python 3.13

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Python 3.10 reaches end of life on October 31, 2026, prompting engineering teams to plan migrations to Python 3.13, which was released on October 7, 2024. Teams are advised to audit their full dependency tree first, checking requires_python metadata for every transitive package to catch compatibility blockers before switching runtimes. PyPI now rejects macOS 11 deployment targets for Python 3.13 builds with HTTP 400 errors, requiring projects to update build configurations to target macOS 12 and current manylinux tags. Tools like pipdeptree and uv can help surface incompatible dependencies early, while cibuildwheel is recommended for validating wheel builds across platforms in CI pipelines. Since Python 3.13 also removes certain standard library modules such as nntplib, teams must replace deprecated components and test thoroughly in containerized environments before moving to production.

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