def movnam_ext(self, extname, hdutype=ANY_HDU, extver=<NUM_LIT:0>):
extname = mks(extname)<EOL>hdu = self._FITS.movnam_hdu(hdutype, extname, extver)<EOL>return hdu-<NUM_LIT:1><EOL>
Move to the indicated extension by name

In general, it is not necessary to use this method explicitly.

returns the zero-offset extension number