On Mon, Aug 16, 2021 at 9:30 AM Steve Dower <steve.do...@python.org> wrote:
> On 8/16/2021 12:47 AM, Guido van Rossum wrote: > > My current proposal is to issue a DeprecationWarning in PyCode_New() and > > PyCode_NewWithPosArgs(), which can be turned into an error using a > > command-line flag. If it's made an error, we effectively have (B); by > > default, we have (A). > > > > Then in 3.13 we can drop them completely. > > We definitely had legitimate use cases come up when adding positional > arguments (hence the new API, rather than breaking the existing one, > which was the first attempt at adding the feature). > > I don't recall exactly what they are (perhaps Pablo does, or they may be > in email/issue archives), but since they exist, presumably they are > useful and viable _despite_ the bytecode varying between releases. This > suggests there's probably a better API we should add at the same time - > possibly some kind of unmarshalling or cloning-with-updates function? > I presume the use cases are essentially some variant of the .replace() API that exists at the Python level. At the C level you would get all fields from an existing code object and pass them to PyCode_New[WithPosArgs] except for e.g. the co_filename field. Unfortunately those use cases will still break if there are any try blocks in the code or if the endline/column info is needed. Also you can't access any of the code object's fields without the internal API (this wasn't always so). So I think it's different now. -- --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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