def shift(self, x=<NUM_LIT:0>, y=<NUM_LIT:0>):
keypoints = [keypoint.shift(x=x, y=y) for keypoint in self.keypoints]<EOL>return self.deepcopy(keypoints)<EOL>
Move the keypoints around on an image.

Parameters
----------
x : number, optional
    Move each keypoint by this value on the x axis.

y : number, optional
    Move each keypoint by this value on the y axis.

Returns
-------
out : KeypointsOnImage
    Keypoints after moving them.