Some notable features introduced in Python 2.x include:
If your .python-version says 3.11 , your CI must resolve that to an exact version. Some tools (like actions/setup-python ) handle aliases gracefully; others (like custom Docker builds) require exact versions. Prefer exact versions in CI-sensitive projects. .python version
If it’s 2.x → stop everything and migrate. If it’s 3.6 or 3.7 → you’re already out of security support. Upgrade now. If it’s 3.8–3.10 → plan an upgrade within months. If it’s 3.11+ → you’re in good shape. Some notable features introduced in Python 2
python-3.11.5
: If you are starting a new project, experts often recommend using the "last year's version" .python version