> Perhaps I'm missing the point, but what functionality or advantage(s) > does this give, over data-classes?
One advantage is maintaining control over the __init__ function without having to write extra code to do so. In the linked discussion from python-ideas, it was mentioned that keyword-only and positional-only arguments can't be used with dataclasses [1]. > Maybe Dataclasses are not being used as much as one might hope, but they > are relatively new, and many Python-Masters simply carry-on constructing > classes the way they have for years... I think one concern I have is that even if this is useful, it might still fall to the same fate. [1]: https://mail.python.org/archives/list/python-id...@python.org/message/SCTXSEKOWDRDGVXXOEB7JUC6WE7XKGMO/ On Fri, 15 Apr 2022 at 22:30, dn <pythonl...@danceswithmice.info> wrote: > > On 15/04/2022 23.19, Sam Ezeh wrote: > ... > > Kudos for doing the research! > > > > Some related implementations are attrs, dataclasses and the use of a > > decorator. And there's potentially a point to be raised that the results > > from the first query indicate that the @dataclasse decorator is not being > > used enough. One advantage this proposal offers is control over the > > arguments that the __init__ function takes. > > > > A downside to using a decorator is that it might become difficult to accept > > arguments that don't need to be assigned to anything. > > > > I gave the example of the following code (unlike the above, this is not > > taken from existing python source code). In this example, a decorator can't > > assign all of the arguments to attributes or else it would produce code > > that does something different. > ... > > > I will support anything which reduces 'boiler-plate' or 'make busy' work! > > Perhaps I'm missing the point, but what functionality or advantage(s) > does this give, over data-classes? > > Maybe Dataclasses are not being used as much as one might hope, but they > are relatively new, and many Python-Masters simply carry-on constructing > classes the way they have for years... > > If data-classes give the impression of being 'syntactic sugar', there's > no particular need to use them - and certainly no rule or demand. > > There are constructs where one might find it easier not to use them. > > @dataclass does allow init=False. > > There is an argument which says that all data-attributes should be > 'created' inside an __init__() or __post_init__(), rather than > 'somewhere', 'later'. > -- > Regards, > =dn > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
