Overwrite in Python- How can I overwrite the code, that "cv2.imshow("HSV from BGR", cv2.cvtColor(img, cv2.COLOR_BGR2HSV))" also valdis at the end?

Question

How can I overwrite the code, that "cv2.imshow("HSV from BGR", cv2.cvtColor(img, cv2.COLOR_BGR2HSV))" also valdis at the end ?

import numpy as np

#read image
src = cv2.imread('input/cat.jpg', cv2.IMREAD_UNCHANGED)
print(src.shape)

#BGR to HSV --> this line must also valid at the end 
cv2.imshow("HSV from BGR", cv2.cvtColor(img, cv2.COLOR_BGR2HSV))

# extract red channel
red_channel = src[:,:,2]

# create empty image with same shape as that of src image
red_img = np.zeros(src.shape)

#assign the red channel of src to empty image
red_img[:,:,2] = red_channel

#save image
cv2.imwrite('output/cat_rot.jpg',red_img)'''