Guido van Rossum wrote: > Looks like NotImplemented is widely misunderstood. It should ONLY be > returned from binary operator overloads, like __add__. > On Wed, Mar 11, 2020 at 03:49 jdve...@gmail.com > wrote: > > Steven D'Aprano wrote: > > On Wed, Mar 11, 2020 at 09:42:15AM -0000, Steve > > Jorgensen wrote: > > I realize this is probably something that would > > be > > hard to change for > > compatibility reasons. Maybe someone can think of a way around that > > though? > > It seems to me that not NotImplemented should result in > > NotImplemented and attempting to convert it to bool should raise > > a > > TypeError exception. > > To my disappointment, you will get your wish, at least for the second > > part: > > https://bugs.python.org/issue35712 > > I am disappointed because, to me, it is a fundamental part of Python's > > object model that everything can be interpreted as a truthy/falsey > > object (in the absence of bugs). > > Anyway, the deprecation warning has been checked in, so it's probably > > only a matter of time before you will get your TypeError :-) > > Oouh, I also feel disappointed. Indeed, I feel that NotImplemented is a > > fiasco and that a TypeError exception should be raised instead. But I > > suppose it is central to duck typing concept... > > > > 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/7VCQ6M... > > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- > > --Guido (mobile) > >
Widely misunderstood and little known. But documentation is very clear if read carefully. Even an example is provided. However, it is a special case and special cases, you know, are... special. They can be difficult to understand by non-advanced users --like me. _______________________________________________ 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/IX7H5RTJE2NPLPVTAJPRBUKNCVVNHZXV/ Code of Conduct: http://python.org/psf/codeofconduct/
