[Python] How to capture an image by keyboard input using opencv?

I wanted to capture an image directly from my camera by keyboard input. For example, when I press 'r', the camera takes a picture of what it sees. Here's my code:

import cv2 as cv
import time

cap = cv.VideoCapture(0)

while True:
_, img = cap.read()

cv.imshow('original', img)

if cv.waitKey(1) == ord('q'):
break
elif cv.waitKey(1) == ord('r'):
cv.imwrite('data_{}.jpg'.format(time.time()), img)
print('saving an image')
continue
else:
continue

cap.release()
cv.destroyAllWindows()


This code is actually working but not that good. Sometimes, when I press 'r' it not saving any image into my directory. How could I improve this code so whenever I press 'r' it's certainly saving an image?

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