In a Q&A, Python programming language creator Guido van Rossum said it was “almost taboo to talk about a Python 4 in a serious sense” following the troubled migration from Python 2.0 to Python 3.0.

Python 3 has been around for five years now, but adoption of the language still languishes—at least according to some. It is a common problem for projects that make non-backward-compatible changes, ...

On his blog, Colin Watson has a lengthy reflection on moving the code for Ubuntu's Launchpad software-collaboration web application from Python 2 to Python 3. He looks at some of the problem areas for ...