import cv2

# take a photo using cv2

img = cv2.VideoCapture(0)

# img.set(cv2.CAP_PROP_AUTO_EXPOSURE, 0.25)
img.set(cv2.CAP_PROP_AUTO_EXPOSURE, 3) # auto mode
img.set(cv2.CAP_PROP_AUTO_EXPOSURE, 1) # manual mode
img.set(cv2.CAP_PROP_EXPOSURE, 100)
# while True:
    
ret, frame = img.read()
if ret:
    cv2.imwrite('img.png', frame)
    img.release()

    print('succeed')