I think this looks great, I can't think of anything wrong with it. Could we put this into the standard library, so that IDEs and linters are programmed to recognise it?
On Wed, May 6, 2020 at 4:55 PM Joao S. O. Bueno <jsbu...@python.org.br> wrote: > Here - with the current inspect.Signature, it is straightforward > to get a decorator that can do that covering most, if not all, > corner cases, and even adding some extra functionality: > > https://gist.github.com/jsbueno/f689a181d50384f627b43b9b2aabe4f2 > > ``` > > from inspect import signature, Parameter > from functools import wraps, partial > > def autoassign(func=None, *, expand_kwargs=False): > > if not func: > return partial(autoassign, expand_kwargs=expand_kwargs) > sig = signature(func) > @wraps(func) > def wrapper(*args, **kwargs): > instance = args[0] > bound_args = sig.bind(*args, **kwargs) > bound_args.apply_defaults() > for i, (key, value) in enumerate(bound_args.arguments.items()): > if i == 0 or sig.parameters[key].kind == > Parameter.POSITIONAL_ONLY: > continue > if expand_kwargs and sig.parameters[key].kind == > Parameter.VAR_KEYWORD: > for kwkey, kwvalue in value.items(): > setattr(instance, kwkey, kwvalue) > continue > setattr(instance, key, value) > return func(*args, **kwargs) > return wrapper > > """ > class A: > @autoassign > def __init__(self, a, b, c=3): > pass > > a = A(1, 2) > assert a.a == 1 and a.b == 2 and a.c == 3 > """ > > > > ``` >
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