Python: Dataclass initializations

demo_dataclass.py

from dataclasses import dataclass, field


@dataclass
class A:
    x: int = 1
    y: int = 2
    z: int = 3

    def __init__(self, **kwargs):
        valid_keys = ["x", "y", "z"]  # This cleans all the fields
        if kwargs:
            for key in valid_keys:
                setattr(self, key, kwargs.get(key))


@dataclass
class B:
    x: int = field(default=1, init=True)
    y: int = field(default=2, init=True)
    z: int = field(default=3, init=True)

    def __post_init__(self, **kwargs):
        for key in kwargs.keys():
            setattr(self, key, kwargs.get(key))


if __name__ == "__main__":
    a = A()
    print(a)
    b = B(x=2)
    print(b)