def _has_straight_flush(self):
        '''
        Check the existence of straight_flush cards
        Returns:
            True: exist
            False: not exist
        '''
        self.flush_cards = self._getflush_cards()
        if len(self.flush_cards) > 0:
            straightflush_cards = self._get_straightflush_cards()
            if len(straightflush_cards) > 0:
                self.best_five = straightflush_cards
                return True
        return False

        Check the existence of straight_flush cards
        Returns:
            True: exist
            False: not exist
        
rlcard/games/limitholdem/utils.py