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.

Here's why some popular features found in other languages—including static typing, multiline lambdas, and native JIT compilation—are a no-go for Python, at least for now. Python has many great ...