some.py

import random
import typing

def true_or_false() -> bool:
    return random.choice([True, False])

class TimeoutError(Exception):
    pass

def random_result() -> typing.Union[dict, Exception]:
    if true_or_false():
        return {"response": random.randint(100, 500)}
    else:
        try:
            raise TimeoutError()
        except TimeoutError as err:
            return err

class RequestContext:
    def __init__(self, **data):
        self._data = data
        self._result: typing.Optional[typing.Union[dict, Exception]] = None

    @property
    def result(self) -> typing.Optional[typing.Union[dict, Exception]]:
        return self._result

    def send(self) -> None:
        self._result = random_result()

class Client:
    def request(self, **data) -> RequestContext:
        return RequestContext(**data)