def _check_equals(self):
        """
        check for = in position 8, set attribute _has_equals
        """
        card_string = self['card_string']
        if len(card_string) < 9:
            self._has_equals = False
        elif card_string[8] == '=':
            self._has_equals = True
        else:
            self._has_equals = False
check for = in position 8, set attribute _has_equals