On Thu, Oct 4, 2018 at 6:33 PM Anders Hovmöller boxed@killingar.net wrote:
Ah, yes. Thank you. So it works in CPython 2.7. But I'm curious, does it work in very old versions? I'm not saying that this is important, because language changes always are for new versions. However, Anders' claim that this not a language change seemed too broad to me. It may be that this change has very little cost, but it should not be dismissed.
It works in:
Python 1 Python 2 Python 3 PyPy 6 IronPython Jython micropython
Are there more I should try?
I've no idea what you actually tried or what actually worked, since you haven't shown your code. However, it doesn't matter. This IS a language change, and it makes no difference how many implementations are lax enough to permit it currently.
Citation: https://mail.python.org/pipermail/python-dev/2018-October/155437.html
It's just like a program assuming that there will always be a user with UID 0, or assuming that every human being has a name that consists of a given name and a family name, or assuming that data sent across the internet will arrive unchanged. You can show millions, billions, trillions of examples that support your assumption, but that doesn't make any difference - the assumption is false as soon as there is a single counter-example, or as soon as the specification is shown to *permit* a counter-example.
ChrisA