autoinit.py

autoinit.py

import inspect


class AutoInit(type):
    def __call__(self, *args, **kwargs):
        sig = inspect.signature(self.__init__)
        data = {
            key: parameter.value for key, parameter in sig.parameters.items()
            if parameter.default is not parameter.empty
        }
        params = list(sig.parameters)[1:]
        data.update(dict(zip(params, args)))
        for key, value in kwargs:
            data[key] = value
        for key, value in data.items():
            setattr(self, key, value)
        return super().__call__(*args, **kwargs)


class Foo(metaclass=AutoInit):
    def __init__(self, a, b, c): ...


class Bar(metaclass=AutoInit):
    def __init__(self, baz):
        print(self.baz)


foo = Foo(1, 2, 3)
print(foo.a)
print(foo.b)
print(foo.c)

bar = Bar('hello')
print(bar.baz)