전문가를 위한 파이썬(2판)

1046

5

부

메타프로그래밍

value = kwargs.pop(name, ...)

setattr(self, name, value)

if kwargs:

self.__flag_unknown_attrs(*kwargs)

def __flag_unknown_attrs(self, *names: str) -> NoReturn:

plural = ‘s’ if len(names) > 1 else ‘’

extra = ‘, ‘.join(f’{name!r}’ for name in names)

cls_name = repr(self.__class__.__name__)

raise AttributeError(f’{cls_name} object has no attribute{plural} {extra}’)

def _asdict(self) -> dict[str, Any]:

return {

name: getattr(self, name)

for name, attr in self.__class__.__dict__.items()

if isinstance(attr, Field)

}

def __repr__(self) -> str:

kwargs = ‘, ‘.join(

f’{key}={value!r}’ for key, value in self._asdict().items()

)

return f’{self.__class__.__name__}({kwargs})’ ...