In this case I am inclined not to backport. In general we should look at existing usage before making changes. Somebody’s code might break — but does it matter? That depends on a lot of factors. E.g. if parsing an error message has become a common way to get useful info out of the error that is not easily available otherwise, we have to tread lightly.
—Guido On Fri, Sep 24, 2021 at 09:59 Terry Reedy <tjre...@udel.edu> wrote: > On 9/24/2021 10:46 AM, Eric V. Smith wrote: > > On 9/24/2021 10:39 AM, Ethan Furman wrote: > >> On 9/24/21 6:51 AM, Eric V. Smith wrote: > >> > >> > >> > This is clearly an improvement. My question is: is it okay to > >> backport this to 3.9 and 3.10? I > >> > think we have a rule that it's okay to change the exception text, > >> but I'm not sure how that > >> > applies to micro releases (3.9.x, 3.10.1). > >> > >> "better" != "bug fix", so I wouldn't change it in a micro release. > > > > Yeah, as much as I'd love to see this included, you're right. Thanks for > > the "adult" take on it. > > Exception messages are subject to change in each new version, without > deprecating the old version. Changes are sometimes backported when the > existing message is sufficiently erroneous. 'Sufficiently' means > something like 'harm of error outweighs harm of changing'. I don't > think a simple, easily recognized, typo or grammar error qualifies. > Among active developers, I believe Guido has the most continuity of > experience with such discussions and decisions. Perhaps something could > usefully be added to the devguide, but I am not sure. > > > -- > Terry Jan Reedy > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/KKZVPESKEAIL4DYEIGSTPLKE34KH7XTQ/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido (mobile)
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