code: def from_fits_renormalized(cls, file_path, hdu, pixel_scale):
          
          psf = PSF.from_fits_with_scale(file_path, hdu, pixel_scale)
          psf[:, :] = np.divide(psf, np.sum(psf))
          return psf
docs: Loads a PSF from fits and renormalizes it
  
          Parameters
          ----------
          pixel_scale
          file_path: String
              The path to the file containing the PSF
          hdu : int
              The HDU the PSF is stored in the .fits file.
  
          Returns
          -------
          psf: PSF
              A renormalized PSF instance