On 4/12/2019 1:52 PM, Viktor Roytman wrote:
That is an interesting solution. In the case of a function from another
library, you could apply the decorator as needed like.
fief(func)(**{'a': 1, 'b': 2})
It looks a little strange, but I've seen stranger.
Indeed. That's not so bad, and I'll look into using fief.
And this is definitely better (for various values of "better") than
language syntax to achieve the same thing.
Eric
On Friday, April 12, 2019 at 12:18:34 PM UTC-4, Lucas Bourneuf wrote:
Hello !
I made *fief*, a small python package allowing just that using a
decorator:
from fief import filter_effective_parameters as fief
@fief
def func(a, b):
# some implementation
# and then, use it as you want to:
func(**MY_BIG_CONFIG_DICT_WITH_MANY_WEIRD_KEYS)
The code is quite simple. You may want to use it, with modifications
(i didn't touch the code for months, maybe years ; it could probably
be improved now).
Link: https://github.com/aluriak/fief <https://github.com/aluriak/fief>
The code:
def filter_effective_parameters(func):
"""Decorator that filter out parameters in kwargs that are not
related to
any formal parameter of the given function.
"""
@wraps(func)
def wrapper(*args, **kwargs):
formal_parameters =
frozenset(signature(func).parameters.keys())
return func(*args, **{
arg: value
for arg, value in kwargs.items()
if arg in formal_parameters
})
return wrapper
Best regards,
--lucas
----- Mail original -----
> De: "Viktor Roytman" <viktor...@gmail.com <javascript:>>
> À: "python-ideas" <python...@googlegroups.com <javascript:>>
> Envoyé: Vendredi 12 Avril 2019 18:01:43
> Objet: Re: [Python-ideas] Syntax for allowing extra keys when
unpacking a dict as keyword arguments
> I could see this being an option, but to someone unfamiliar with
it, it
> might seem strange that * unpacks iterables, ** unpacks dicts,
and *** is a
> special thing only for keyword arguments that mostly behaves like
**.
>
> On Friday, April 12, 2019 at 11:26:37 AM UTC-4, Bruce Leban wrote:
>>
>>
>> On Fri, Apr 12, 2019, 8:12 AM Viktor Roytman <viktor...@gmail.com
>> <javascript:> wrote:
>>
>>>
>>> >>> func(**{'a': 1, 'b': 2})
>>> Traceback (most recent call last):
>>> File "<stdin>", line 1, in <module>
>>> TypeError: func() got an unexpected keyword argument 'b'
>>>
>>
>> Perhaps func(***kws)?
>>
>> I think this is a real problem given the frequent convention
that you can
>> freely add fields to json objects with the additional fields to
be ignored.
>>
>
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