import cv2
import matplotlib.pyplot as plt


class LaptopCamera:
    def __init__(self, cam_id=0):
        self.cam_id = cam_id
        # There must be some "lazy" way to initialize it
        self.cap = cv2.VideoCapture(cam_id)
        self.cap.release()
        self.image = None
    def stage(self):
        ...
    def trigger(self):
        self.cap.open(self.cam_id)
        self.image = self.cap.read()[1]
        self.cap.release()
    def unstage(self):
        ...
    def show(self):
        plt.imshow(self.image)
        plt.show()


if __name__ == '__main__':
    lc = LaptopCamera()
    lc.trigger()
    lc.show()