Is there are good DRY fix for this painful design pattern?

[Steven D'Aprano]

On Mon, 26 Feb 2018 17:39:43 +0100, Peter Otten wrote:

[...]
> I have not yet looked into dataclasses. Don't they handle the __init__()
> part? Anyway, here's my attempt to make spam() less spammy:

I'm not too concerned about __init__, it's only one method :-)



> $ cat attrs_to_args_decorator.py
> import functools
> import inspect
> 
> def add_defaults(f):
>     argnames = inspect.getfullargspec(f).args[1:]
> 
>     @functools.wraps(f)
>     def wrapper(self, *args, **kw):
>         args = [
>             getattr(self, name) if value is None else value for name,
>             value in zip(argnames, args)
>         ]
>         for name in argnames[len(args):]:
>             if name not in kw or kw[name] is None:
>                 kw[name] = getattr(self, name)
>         return f(self, *args, **kw)
>     return wrapper
[...]

Interesting, this does look promising, thanks.



-- 
Steve