But they can simply continue using whatever version of Python works for them, right? I never got this argument, personally. Sure, having to rip out a bunch of

But they can simply continue using whatever version of Python works for them, right? I never got this argument, personally. Sure, having to rip out a bunch of code because of lang-level changes can suck, but you also only really need to do that if you're starting a new project anyway or for whatever reason want to keep being pinned to @latest version of the lang. If you're a researcher who uses Python 2 as a means to an end, then just stick to Py2. It's unreasonable to expect the entire python world to freeze in place so you don't have an annoying migration journey. If you need the latest Py3 features, them's just the brakes I'm afraid, eventually APIs need to change.