[dTal]

The constant stream of breaking changes in Python - that is, in the "standard library" which may as well be part of the language - is the most frustrating thing about Python. There are perfectly good projects that can no longer be run without major work, just because they were left unmaintained for a few years. This is a silly state of affairs, and depressingly common when the fix is really simple: version declarations. Feel free to move fast and break things, but always provide the old behaviour if the user puts a "version=3.2" flag in their code. There's no reason this mechanism couldn't have extended to every change in Python since its release.

If POV-Ray can do it, Python could have done it.