El jue, 22 jun 2023 a las 8:22, Randolf Scholz (<randolf.sch...@gmail.com>) escribió:
> Dataclasses should provide a way to ignore a type hinted attributes, and > not consider them as fields. > > For example, some attributes might be derived during `__post_init__` from > the values of the fields or other variables. > > If one wants to still type hint these attributes, one has to awkward > workarounds to avoid having dataclass interpret them as fields. ( > https://stackoverflow.com/questions/76532816) > > I propose `NON_FIELDS` sentinel, analogous to `KW_ONLY`. (alternative name > suggestions welcome). when writing a dataclass, all attributes after this > sentinel are ignored and not considered fields. > > ``` > @dataclass > class Foo: > field0: int > field1: int > > _: KW_ONLY > > fieldN: int > > _: NON_FIELDS > > attr0: int # @dataclass will ignore this type hint. > How is this different from `attr0: int = field(init=False)`? > ``` > > Additionally one could consider adding an `attribute` typing construct, > such that `attr0: attribute[int]` would mark it as a non-field attribute. > _______________________________________________ > 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/P67URFV2JJRFD6J5TXD44EEBO4IRTEYF/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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