How to implement in python passing opencv image "pointer" to the constructor of another class?

Question

Python

Hello. How to implement such a scheme in python?
ps Now passing the parameter (img) to the constructor of class A goes by reference, but when the painter method is called, there is no image, because another reference is overwritten in the img variable of class B

class A:
  def __init__(self, img):
   self.img = img
  def show(self):
   cv2.imshow(self.img)
   cv2.waitKey(33)

class B:
  def __init__(self):
   ...
   self.img = np.array((1,1,1),np.uin8)
   self.painter = A(self.img)

  def getImg(self):
    whille True:
       _, self.img = self.cap.read()
      self.painter.show()

Answer 1

From the example it is not clear what your problem is, except for the lost indents, well, you need to add self to the painter (maybe pointer?) if you want it to be available between methods.

Answer 2

After discussion, I corrected the answer:

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()