On 12/22/23 10:38, Steve Jorgensen wrote:
I am finding that it would be useful to be able to define a dataclass that is
an abstract base class and define some of its field as abstract.
As I am typing this, I realize that I could presumably write some code to
implement what I'm asking for. Maybe it is a good enough idea to make part of
the standard API in any case though? I'm thinking that a field would be made
abstract by passing `abstract=True` as an argument to `dataclasses.field()`.
What is the use-case?
Please provide an example (in English).
Please outline some sample code.
After a bit of reading-around*, thoughts seemed to coalesce around two,
separate but inextricably-linked, components which the
code-reader/-reviewer will be required to comprehend:
1 that there is an ABC
2 that there is/are concrete implementations of that ABC
(aside from instances of the latter)
Accordingly, why the need for the ABC to be a dataclass?
Is there some reason why this use-case cannot implement a dataclass of a
'standard' ABC?
(following my policy of being 'basically-lazy', I like using
dataclasses. However, sometimes they are not the best tool for the job!)
* web.refs of possible interest:
https://docs.python.org/3/library/abc.html [noting the >=v3.3 use of
properties (cf "field")
https://stackoverflow.com/questions/51079503/dataclasses-and-property-decorator
https://florimond.dev/en/posts/2018/10/reconciling-dataclasses-and-properties-in-python
Let's also state, and discard, the idea that there is no need (from
Python's perspective) for an ABC at all, creating a super-(data)class,
and inheriting from there 'works' - but doesn't help comprehension.
--
Regards =dn
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