Syntactic sugar to encourage use of named arguments

Ideas
192

I’m curious how folks react to this; it appears to exactly hit the goals of this idea, while also being clear that you intend to use particular variables with a specific function and protecting against spelling errors. It could use a little more intelligence when interleaving positional and keyword args.

class 'Partial' or 'Closure' or 'SimpleArgspace' or ... 
from typing import Callable
import inspect

class Partial:
    def __init__(self, func: Callable):
        self.__dict__['_func'] = func
        self.__dict__['_kwargs'] = inspect.getargs(func.__code__).args
        self.__dict__['_argvals'] = {}

    def __setattr__(self, name: str, value):
        if name in self._kwargs:
            self.__dict__['_argvals'][name] = value
        else:
            raise TypeError(f'"{name}" not an argument for function "{self._func.__name__}"')

    def __call__(self, *args, **kwargs):
        return self._func(*args, **(self._argvals | kwargs))

def f(*,x,y,z):
    return x*y*z

p = Partial(f)
p.x = 1
p.y = 2

print(p(z=3))
1 Like