Although 3.1 also meets that criteria. And even with python 2, the dependencies could still update. The main thing is that it's the not-updating that will make

Although 3.1 also meets that criteria. And even with python 2, the dependencies could still update. The main thing is that it's the not-updating that will make your code run forever (on any system, language, version), not the fact that it's python 2.