'`TableHDU` verify method.'

def _verify(self, option='warn'):

    errs = super(TableHDU, self)._verify(option=option)
    self.req_cards('PCOUNT', None, (lambda v: (v == 0)), 0, option, errs)
    tfields = self._header['TFIELDS']
    for idx in range(tfields):
        self.req_cards(('TBCOL' + str((idx + 1))), None, _is_int, None, option, errs)
    return errs
