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How do I create custom KeyPoints to compute SIFT?

I am using opencv-Python

I have identified Corner points using cv2.cornerHarris. The output is of type "dst"

I need to compute SIFT features of the corner points. The input to sift.compute() has to be of the type "KeyPoint"

I'm not able to figure out how to use cv2.KeyPoint()

How do I do this ?

Thanks :)