A callable that takes a dataclass object and applies appropriate target-methods based on the types of the attributes

dataclasses_singledispatch.py

from dataclasses import dataclass
from functools import singledispatchmethod
from typing import List, TypeVar

T = TypeVar("T")


class Process:
    @singledispatchmethod
    def _process(self, arg: T) -> None:
        raise NotImplementedError("Method has not been implemented for this type.")

    @_process.register
    def _(self, arg: int) -> str:
        return f"{arg} is an integer."

    @_process.register
    def _(self, arg: str) -> str:
        return f"{arg} is a string."

    def __call__(self, data: dataclass) -> List[str]:
        return [self._process(attr) for attr in data.__dict__.values()]


process = Process()


@dataclass
class Data:
    arg_1: int
    arg_2: str


data = Data(arg_1=11, arg_2="11")
assert process(data) == ["11 is an integer.", "11 is a string."]