Python and deprecations redux

The problem of how to deprecate pieces of the Python language in a minimally disruptive way has cropped in various guises over the last few years—in truth, it has been wrangled with throughout much of language's 30-year history. The scars of the biggest deprecation, that of Python 2, are still rather fresh, both for users and the core developers, so no one wants (or plans) a monumental change of that sort. But the language community does want to continue evolving Python, which means leaving some "baggage" behind; how to do so without leaving further scars is a delicate balancing act, as yet another discussion highlights.

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