Andy_U

from typing import Any, Optional


class A:
    def __init__(self, option: str):
        self._option = option

    def option(self) -> str:
        return self._option


class B:

    def __init__(self, option: int):
        self._option = option

    def option(self) -> int:
        return self._option


def func(x: Any, *, a: Optional[A] = None, b: Optional[B] = None) -> None:

    if a is not None:
        print(a.option())

    if b is not None:
        print(b.option())


if __name__ == '__main__':

    func(None, a=A('aaa'))
    func(None, b=B(666))
    func(None, a=A('AAA'), b=B(666))

D:\Temp>py
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()

D:\Temp>py -2
Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:30:26) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()

D:\Temp>

from typing import Any

import cv2
import numpy


class A:

    @staticmethod
    def show(img: numpy.ndarray) -> None:
        cv2.imshow('image', img)
        cv2.waitKey(3300)


class B:

    def __init__(self, painter: Any):
        self.painter = painter

    def getimg(self) -> None:
        while True:
            self.painter.show(cv2.imread('Capture.JPG'))


if __name__ == '__main__':
    b = B(A())
    b.getimg()