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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 get_sky_coords(self):
 """ Get the sky coordinates of all the pixels in this pixelization """

        if self._ipix is None:
            theta, phi = hp.pix2ang(
                self._nside, list(range(self._npix)), self._nest)
        else:
            theta, phi = hp.pix2ang(self._nside, self._ipix, self._nest)

        lat = np.degrees((np.pi / 2) - theta)
        lon = np.degrees(phi)
        return np.vstack([lon, lat]).T