from dataclasses import dataclass

import inspect

​

@dataclass

class Config:

    var_1: str

    var_2: str

​

    @classmethod

    def from_dict(cls, env):      

        return cls(**{

            k: v for k, v in env.items() 

            if k in inspect.signature(cls).parameters

        })

​

​

# usage:

params = {'var_1': 'a', 'var_2': 'b', 'var_3': 'c'}

c = Config.from_dict(params)   # works without raising a TypeError 

print(c)

# prints: Config(var_1='a', var_2='b')