On Sat, Oct 16, 2021 at 3:18 PM MRAB <pyt...@mrabarnett.plus.com> wrote:
> On 2021-10-16 22:39, Oscar Benjamin wrote: > > I would just like to note that in SymPy we had problems a few times > > because of changes made to typing in the 3.5.x series. The problem was > > that CI tested the newest version of 3.5.x but many users were using > > older versions and many features were added in micro releases e.g. > > (random example from docs) typing.NoReturn has: > > > > New in version 3.5.4. > > New in version 3.6.2. > > > > What that meant is that if a contributor had used NoReturn as a type > > hint then because SymPy's CI only tested the most recent 3.5.x it > > would not be noticed in PR review that SymPy had become unimportable > > in 3.5.0. > > > > This was not a major problem: where I saw complaints it seemed that > > users were happy to upgrade to a newer Python 3.5.x. In general though > > those changes do not match the explanation shown above. I welcome the > > documentation around what kind of changes will be made in different > > releases but just to be clear, should this preclude things like adding > > typing.NoReturn in micro releases? (I hope so.) > At the time we justified this because the typing module was provisional (see PEP 411). The rules are somewhat relaxed for provisional modules (though I admit we probably stretched the rules a bit). > Wasn't there a change in a micro version of Python 2? I can't remember > the details, but from hindsight it was seen as a mistake that should not > be repeated. > That was in the olden days. In particular, bool() and True/False were introduced in Python 2.2.1 ( https://docs.python.org/2.7/library/functions.html#bool). We learned our lesson (though not perfectly, see above :-). -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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