code: def brightness(im):
      '''
      Return the brightness of an image
      Args:
          im(numpy): image
  
      Returns:
          float, average brightness of an image
      '''
      im_hsv = cv2.cvtColor(im, cv2.COLOR_BGR2HSV)
      h, s, v = cv2.split(im_hsv) 
      height, weight = v.shape[:2]
      total_bright = 0
      for i in v:
          total_bright = total_bright+sum(i)
      return float(total_bright)/(height*weightf brightness(im):
      '''
      Return the brightness of an image
      Args:
          im(numpy): image
  
      Returns:
          float, average brightness of an image
      '''
      im_hsv = cv2.cvtColor(im, cv2.COLOR_BGR2HSV)
      h, s, v = cv2.split(im_hsv) 
      height, weight = v.shape[:2]
      total_bright = 0
      for i in v:
          total_bright = total_bright+sum(i)
      return float(total_bright)/(height*weight)
docs: Return the brightness of an image
      Args:
          im(numpy): image
  
      Returns:
          float, average brightness of an image