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easy !

ifyou look at resize():

>>> help(cv2.resize)
>>> resize(...)
    resize(src, dsize[, dst[, fx[, fy[, interpolation]]]]) -> dst

you see, there's an fx and fy parameter. use those instead of the fixed dsize argument, to preserve your original ratio:

 # half size:
 resized = cv2.resize(image, fx=0.5, fy=0.5, interpolation = cv2.INTER_LINEAR)