how to scale an image on python-opencv?

When i tried to scale the photo in python it gives me this error:

IndentationError: unindent does not match any outer indentation level

My code:

cv.SetImageROI(image, (pt1[0], pt1[1],pt2[0]-pt1[0], int((pt2[1] - pt1[1]) * 0.6)))


The problem is with your indentation in python.

In python code must be aligned together when in the same scope.

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