Something that Python gets right is that their entire docs site is versioned - select 2.7.18, for example, and you get the 2.7 docs right down to the tutorial.

Something that Python gets right is that their entire docs site is versioned - select 2.7.18, for example, and you get the 2.7 docs right down to the tutorial. The Python development process is also very careful about keeping documentation up to date; the PEP process even requires an explicit "How to Teach This" section for proposals that add or change language features.