rgb to grayscale python opencv

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

import cv2
  
image = cv2.imread('C:/Users/N/Desktop/Test.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
  
cv2.imshow('Original image',image)
cv2.imshow('Gray image', gray)
  
cv2.waitKey(0)
cv2.destroyAllWindows()