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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def pix2sky(self, pixel):
 """ Convert pixel coordinates into sky coordinates. Parameters pixel : (float, float) The (x,y) pixel coordinates Returns ------- sky : (float, float) The (ra,dec) sky coordinates in degrees """

        x, y = pixel
        # wcs and pyfits have oposite ideas of x/y
        return self.wcs.wcs_pix2world([[y, x]], 1)[0]