I think the idea you're looking for is an alternative for the pprint module that allows classes to have formatting hooks that get passed in some additional information (or perhaps a PrettyPrinter object) that can affect the formatting.
This would seem to be an ideal thing to try to design and put on PyPI, *except* it would be more effective if there was a standard, rather than several competing such modules, with different APIs for the formatting hooks. So I encourage having a discussion (might as well be here) about the design of the new PrettyPrinter API. On Sun, Mar 15, 2020 at 4:08 AM Steve Jorgensen <ste...@stevej.name> wrote: > This is really an idea for an idea. I'm not sure what the ideal dunder > method names or APIs should be. > > > Encoding awareness: > > The informal (`str`) representations of `inf` and `-inf` are "inf" and > "-inf", and that seems appropriate as a known-safe value, but if we're > writing the representation to a stream, and the stream has a Unicode > encoding, then those might prefer to represent themselves as "∞" and "-∞". > If there were a dunder method for informal representation to which the > destination stream was passed, then the object could decide how to > represent itself based on the properties of the stream. > > > Prettiness awareness: > > It would be nice if an object could have control of how it is represented > when pretty-printed. If there is any way for that to be done now, it is not > at all evident from the pprint module documentation. It would be nice if > there were some method that, if implemented for the object, would be used > to allow the object to tell the pretty printer to treat it is a composite > with starting text, component objects, and ending text. > > > Additional thoughts & open questions: > > Perhaps there should only be stream awareness for informal representation > and prettiness awareness for formal representation (separate concepts and > APIs) or perhaps both ideas are applicable to both kinds of representation. > > Is it better for a stream-aware representation method to return the value > to be written to the stream or to directly append its representation to > that stream? > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/OQPPJ7SNM5CZUI5RYT5R4Z6YZWMNNTZS/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --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/>
_______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/3EF6W7DDSWRUAW57CFBTIUMANEH3P4TX/ Code of Conduct: http://python.org/psf/codeofconduct/
