Py CLI parser with data classes rendering parsing simpler to implement and expand

cli_parser.py

""" CLI parser example using dataclasses. Two different approaches. 
As presented by ArjanCodes https://youtu.be/Y9_h7ehjhO4?si=YrtPhBs_TXvUOv6A&t=1295
But seems to be found on GitHub or Reddit as well, so not sure if it's his original work or if he just found it somewhere else.
Doesn't matter, it's pretty helpful.
"""
import argparse
from dataclasses import dataclass, fields
from typing import Self, Type

@dataclass
class ClIArgs:
    """CLI args parser. Behavious: - All fields are required. - No default values. - No support for boolean flags."""

    @classmethod
    def args_from_cli(cls: Type[Self]) -> Self:
        """Parse command-line arguments and return an instance of the subclass."""

        parser = argparse.ArgumentParser()
        for field in fields(cls):
            parser.add_argument(f'--{field.name}', type=field.type, required=True)
        args = parser.parse_args()
        return cls(**vars(args))
    

@dataclass
class CLI2Args:
    """CLI args parser. Behavious: - All fields are optional. - Default values are supported. - Boolean flags are supported
    More ergonomic for users, but less strict for developers.
    ."""

    @classmethod
    def args_from_cli(cls: Type[Self]) -> Self:
        """Parse command-line arguments and return an instance of the subclass."""

        parser = argparse.ArgumentParser()
        for field in fields(cls):
            arg_name = f'--{field.name.replace("_", "-")}'
            if field.type == bool:
                parser.add_argument(arg_name, action='store_true')
            else:
                parser.add_argument(arg_name, type=field.type, default=field.default)
        args = parser.parse_args()
        return cls(**vars(args))



@dataclass
class Args(ClIArgs):
    example_arg: str = "default_value"
    verbose: bool = False
    some_number: int = 42

@dataclass
class Args2(CLI2Args):
    example_arg: str = "default_value"
    verbose: bool = False
    some_number: int = 42

def main():
    args = Args.args_from_cli()
    print(args)
    args2 = Args2.args_from_cli()
    print(args2)


if __name__ == "__main__":
    main()