Keyboard Control for Save image and DestroyWindow in OpenCV

Press s to save and ESC(key) to Destroy window in opencv

import cv2
img = cv2.imread('whirldata.jpg',0)
cv2.imshow('Whirldata Window',img)
k = cv2.waitKey(0)
if k == 27:         # wait for ESC key to exit
    cv2.destroyAllWindows()
elif k == ord('s'): # wait for 's' key to save and exit
    cv2.imwrite('whirldata.png',img)
    cv2.destroyAllWindows()