code: def movnam_hdu(self, extname, hdutype=ANY_HDU, extver=0):
          
          extname = mks(extname)
          hdu = self._FITS.movnam_hdu(hdutype, extname, extver)
          return hdu
docs: Move to the indicated HDU by name
  
          In general, it is not necessary to use this method explicitly.
  
          returns the one-offset extension number