[issue33129] Add kwarg-only option to dataclass

[Alan Du]

Change by Alan  Du <ahd2...@columbia.edu>:


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keywords: +patch
pull_requests: +5975
stage:  -> patch review

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[issue33129] Add kwarg-only option to dataclass

[Alan Du]

Alan  Du <ahd2...@columbia.edu> added the comment:

Err... the right link would actually be 
https://github.com/alanhdu/cpython/tree/bpo-33129.

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[issue33129] Add kwarg-only option to dataclass

[Alan Du]

Alan  Du <ahd2...@columbia.edu> added the comment:

If this would be accepted, I'd be happy to contribute a patch adding a 
`kwarg_only` option to `dataclass` (although it might take me a while since I'm 
not super familiar with the Python development workflow). I believe I already 
have the code change necessary at 
https://github.com/alanhdu/cpython/commit/fa35b39e5204845690ff774812f882f40b0e5f90
 (although it still needs tests and documentation).

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[issue33129] Add kwarg-only option to dataclass

[Alan Du]

New submission from Alan  Du <ahd2...@columbia.edu>:

I'd like to request a new option to the `dataclasses.dataclass` decorator to 
make the `__init__` keyword-only.

The two use-cases I have in mind are:

(1) Using as a dataclass big-bag-of-config. In this scenario, forcing the user 
to specify the keywords is a lot nicer than passing in a dozen positional 
parameters.

(2) Having kwarg-only parameters means that inheritance and default parameters 
play nicely with each other again instead of raising a TypeError.

--
components: Library (Lib)
messages: 314341
nosy: alan_du, eric.smith
priority: normal
severity: normal
status: open
title: Add kwarg-only option to dataclass
type: enhancement
versions: Python 3.7, Python 3.8

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