“System error: new style getargs format but argument is not a tuple” when using cv2.blur

For cv2.blur, you need to give ksize as a tuple of two elements , like (2,2). But for medianBlur, ksize = 3 is sufficient. It will deduct a square kernel from it.

So make code like this :

im = cv2.imread('./test_imgs/zzzyj.jpg')
cv2.imshow('Image', cv2.blur(im, (3,3)))
cv2.waitKey(0)
cv2.destroyAllWindows()

Hope it will work!!!